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CMS Papers

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2018-07-18
20:42
Search for dark matter particles produced in association with a top quark pair at $\sqrt{s} = $ 13 TeV / CMS Collaboration
A search is performed for dark matter particles produced in association with a top quark pair in proton-proton collisions at $\sqrt{s} = $ 13 TeV. [...]
arXiv:1807.06522 ; CMS-EXO-16-049 ; CERN-EP-2018-183 ; CMS-EXO-16-049-003.
- 2018.
Fulltext - Fulltext - 00011 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown. - 00012 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown. - 00010 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown. - 00013 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown. - 00008 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the all-hadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the different-flavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background. - 00010 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the all-hadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the different-flavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background. - 00007 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the all-hadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the different-flavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background. - 00011 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the all-hadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the different-flavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background. - 00009 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the all-hadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the different-flavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background. - 00009 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the all-hadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the different-flavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background. - 00013 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval. - 00007 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval. - 00012 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval. - 00008 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval. - Fulltext - Fulltext

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2018-07-17
14:06
Search for the Higgs boson decaying to two muons in proton-proton collisions at $\sqrt{s} = $ 13 TeV / CMS Collaboration
A search for the Higgs boson decaying to two oppositely charged muons is presented using data recorded by the CMS experiment at the CERN LHC in 2016 at a center-of-mass energy $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. [...]
arXiv:1807.06325 ; CMS-HIG-17-019 ; CERN-EP-2018-165 ; CMS-HIG-17-019-003.
- 2018.
00004 The 95\% \CL upper limit on the signal strength modifier, $\mu$, in the region around the Higgs boson mass for the combination of the 7, 8, and 13\TeV data sets together with the expected limit obtained in the background only hypothesis (dashed black line) and in the signal-plus-background hypothesis (dashed red line) for the SM Higgs boson with $\mH=125\GeV$. - 00003 The transformed BDT output distributions in data (solid points) and MC simulation (histograms). The stacked solid histograms represent the background processes, while the stacked dashed histograms represent the signal. In the legend, V denotes the vector bosons $\PW$ and $\PZ$, and TTX indicates the top quark pair production in association with a vector boson V or another top quark pair. The vertical lines denote the BDT response intervals indicated in Table~1. - 00005 Data and weighted sum of signal-plus-background fits to each category. Events are weighted according to the expected signal-to-background ratio in the category to which they belong. The lower panel shows the difference between the data and the background component of the fit. - Fulltext - Fulltext - Fulltext

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2018-07-17
09:40
Measurements of the differential jet cross section as a function of the jet mass in dijet events from proton-proton collisions at $\sqrt{s} = $ 13 TeV / CMS Collaboration
Measurements of the differential jet cross section are presented as a function of jet mass in dijet events, in bins of jet transverse momentum, with and without a jet grooming algorithm. [...]
arXiv:1807.05974 ; CMS-SMP-16-010 ; CERN-EP-2018-180 ; CMS-SMP-16-010-003.
- 2018.
00027 JMS in simulation (mean of a fit to $m_{\text{reco}}/m_{\text{gen}}$) for ungroomed (left) and groomed (right) jets in different generated ${\pt}$ bins, as a function of generated mass. - 00045 JMR in simulation (width of a fit to $m_{\text{reco}}/m_{\text{gen}}$) for ungroomed (left) and groomed (right) jets in different generated $\pt$ bins, as a function of generated mass. - 00028 JMS in simulation (mean of a fit to $m_{\text{reco}}/m_{\text{gen}}$) for ungroomed (left) and groomed (right) jets in different generated ${\pt}$ bins, as a function of generated mass. - 00044 JMR in simulation (width of a fit to $m_{\text{reco}}/m_{\text{gen}}$) for ungroomed (left) and groomed (right) jets in different generated $\pt$ bins, as a function of generated mass. - 00029 Systematic uncertainties in the absolute cross section after unfolding for two $\pt$ bins after grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00034 Systematic uncertainties in the normalized cross section after unfolding for two $\pt$ bins before grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00042 Systematic uncertainties in the normalized cross section after unfolding for two $\pt$ bins after grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00032 Systematic uncertainties in the absolute cross section after unfolding for two $\pt$ bins before grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00051 Systematic uncertainties in the absolute cross section after unfolding for two $\pt$ bins after grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00030 Systematic uncertainties in the normalized cross section after unfolding for two $\pt$ bins after grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00038 Comparison of data to MC simulation for groomed jets for two $\pt$ bins at the detector level. The data and their statistical uncertainties are shown by the black points with the error bars. The {\PYTHIA}8 results before the unfolding are shown in the shaded histograms, including experimental and theoretical systematic uncertainties. The \HERWIGpp results before unfolding are shown without uncertainties as a dashed magenta histogram. - 00041 Systematic uncertainties in the normalized cross section after unfolding for two $\pt$ bins before grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00048 Systematic uncertainties in the absolute cross section after unfolding for two $\pt$ bins before grooming. The red dotted lines show the JES uncertainties. The red dash-dot-dotted lines show the JER uncertainties. The blue dash-dotted lines show the JMR uncertainties. The blue dash-dot-dotted lines show the JMS uncertainties. The cyan dashed lines show the PU uncertainties. The orange dash-dotted lines show the luminosity uncertainties. The magenta dash-dot-dot-dotted lines show the PDF uncertainties. The green dash-dotted lines show the physics model uncertainties. The black short-dash-short-dashed lines show the statistical uncertainties. - 00031 Comparison of data to MC simulation for groomed jets for two $\pt$ bins at the detector level. The data and their statistical uncertainties are shown by the black points with the error bars. The {\PYTHIA}8 results before the unfolding are shown in the shaded histograms, including experimental and theoretical systematic uncertainties. The \HERWIGpp results before unfolding are shown without uncertainties as a dashed magenta histogram. - 00036 Comparison of data to MC simulation for ungroomed jets for two $\pt$ bins at the detector level. The data and their statistical uncertainties are shown by the black points with the error bars. The {\PYTHIA}8 results before the unfolding are shown in the shaded histograms, including experimental and theoretical systematic uncertainties. The \HERWIGpp results before unfolding are shown without uncertainties as a dashed magenta histogram. - 00049 Absolute cross section for groomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (Stat.+sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. The MC simulations are normalized to the data over the entire $\pt$ range. - 00035 Comparison of data to MC simulation for ungroomed jets for two $\pt$ bins at the detector level. The data and their statistical uncertainties are shown by the black points with the error bars. The {\PYTHIA}8 results before the unfolding are shown in the shaded histograms, including experimental and theoretical systematic uncertainties. The \HERWIGpp results before unfolding are shown without uncertainties as a dashed magenta histogram. - 00039 Absolute cross section for ungroomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (Stat. + sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. The MC simulations are normalized to the data over the entire $\pt$ range. - 00040 Absolute cross section for ungroomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (Stat. + sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. The MC simulations are normalized to the data over the entire $\pt$ range. - 00026 Absolute cross section for groomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (Stat.+sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. The MC simulations are normalized to the data over the entire $\pt$ range. - 00043 Normalized cross section for the ungroomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (stat.+sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. - 00037 Normalized cross section for the ungroomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (stat.+sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. - 00047 Normalized cross section for the groomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (stat.+sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. The predictions from Ref.~\cite{Frye:2016aiz} (Frye et. al.) are shown with blue squares. The uncertainties include scale variations and an estimate of nonperturbative effects. The predictions from Ref.~\cite{Marzani:2017mva} (Marzani et. al.) are shown with red triangles. The uncertainties only include effects from scale variations, since nonperturbative corrections have been considered directly in the calculation. - 00033 Normalized cross section for the groomed jets for two $\pt$ bins. The data are shown by the black points, with dark grey bands for the statistical uncertainty (Stat. unc.) and with light grey bands for the total uncertainty (stat.+sys. unc., added in quadrature). The predictions from {\PYTHIA}8, \HERWIGpp, and \POWHEG+ \PYTHIA are shown with dashed black, dash-dot-dotted magenta, and dash-dotted green histograms, respectively, with no uncertainties shown. The predictions from Ref.~\cite{Frye:2016aiz} (Frye et. al.) are shown with blue squares. The uncertainties include scale variations and an estimate of nonperturbative effects. The predictions from Ref.~\cite{Marzani:2017mva} (Marzani et. al.) are shown with red triangles. The uncertainties only include effects from scale variations, since nonperturbative corrections have been considered directly in the calculation. - 00046 Normalized cross section for groomed jets for all $\pt$ bins. Bins with total uncertainty larger than 60\% are not shown. The data are shown with markers for each $\pt$ bin, scaled by a factor for better visibility. The total uncertainties (statistical added to systematic in quadrature) are shown with grey bands. The predictions from {\PYTHIA}8 are shown as a dashed red line. - 00050 Normalized cross section for ungroomed jets for all $\pt$ bins. Bins with total uncertainty larger than 60\% are not shown. The data are shown with markers for each $\pt$ bin, scaled by a factor for better visibility. The total uncertainties (statistical added to systematic in quadrature) are shown with grey bands. The predictions from {\PYTHIA}8 are shown as a dashed red line. - Fulltext - Fulltext - Fulltext

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2018-07-11
11:51
Measurement of inclusive and differential Higgs boson production cross sections in the diphoton decay channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV / CMS Collaboration
Measurements of the inclusive and differential production cross sections for the Higgs boson in the diphoton decay channel are performed using the data set of proton-proton collisions at $\sqrt{s} = $ 13 TeV collected by the CMS experiment at the LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb$^{-1}$ . [...]
CMS-HIG-17-025 ; CERN-EP-2018-166 ; CMS-HIG-17-025 ; CERN-EP-2018-166 ; arXiv:1807.03825 ; CMS-HIG-17-025-003.
- 2018.
Additional information for the analysis - CMS AuthorList - Fulltext - Fulltext

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2018-07-09
22:04
Precision measurement of the structure of the CMS inner tracking system using nuclear interactions / CMS Collaboration
The structure of the CMS inner tracking system has been studied using nuclear interactions of hadrons striking its material. [...]
arXiv:1807.03289 ; CMS-TRK-17-001 ; CERN-EP-2018-144 ; CMS-TRK-17-001-003.
- 2018.
00014 The pixel detector support tube with the fitted values for an ellipse with semi-minor axis \Rx, semi-major axis \Ry, and center $(\xz,\yz)$ for \AbsZbarrel. The $x$-$y$ plane after background subtraction (upper), and the $r$-$\phi$ coordinates before background subtraction (lower), are shown. The density of NI vertices is indicated by the color scale. The red line shows the fitted ellipse. The blue point in the center of the $x$-$y$ plane corresponds to the average beam spot position of $\xbs=0.8\unit{mm}$ and $\ybs=0.9\unit{mm}$ in 2015. - 00012 The BPIX detector inner shield with the fitted values for two half-circles of common radius \rc and centers (\xZfar, \yZfar) and (\xZnear, \yZnear) for \AbsZbarrel. The $x$-$y$ plane after background subtraction (upper), and the $r$-$\phi$ coordinates before background subtraction (lower), are shown. The density of NI vertices is indicated by the color scale. The red and black lines at around $r = 3.8\unit{cm}$ show the fitted half-circles on the far and near sides, respectively. The blue point at the center of the $x$-$y$ plane corresponds to the average beam spot position of $\xbs=0.8\unit{mm}$ and $\ybs=0.9\unit{mm}$ in 2015. Modules in the first BPIX detector layer are visible in~(lower) at larger radius. - 00005 The beam pipe region with the fitted values for a circle of radius \rc and center$(\xz, \yz)$ for \AbsZbarrel. The $x$-$y$ plane after background subtraction (upper), and the $r$-$\phi$ coordinates before background subtraction (lower), are shown. The density of NI vertices is indicated by the color scale. The red line shows the fitted circle. The blue point in the center of the $x$-$y$ plane corresponds to the average beam spot position of $\xbs=0.8\unit{mm}$ and $\ybs=0.9\unit{mm}$ in 2015. - 00017 The BPIX detector support rails after background subtraction in the $x$-$y$ plane for the combined tracker detector barrel and endcap regions. Horizontal red lines correspond to the fit of the BPIX detector support rails. The density of NI vertices is indicated by the color scale. - 00008 The density of NI vertices versus \rhoZero for a $\phi$ slice of the beam pipe located near $\phi = 0$ (black line) for \AbsZbarrel before background subtraction. The green hatched area corresponds to the signal region, the red hatched area corresponds to the sideband region used to fit the background, and the blue hatched area corresponds to the estimated background in the signal region. - 00015 The beam pipe region viewed in the $x$-$y$ plane for \AbsZbarrel before background subtraction. The density of NI vertices is indicated by the color scale. $(0,0)$ is the origin of the CMS offline coordinate system, which is discussed in Section~\ref{CMScoordinate}. The blue point in the center of the distribution corresponds to the average beam spot position of $\xbs=0.8\unit{mm}$ and $\ybs=0.9\unit{mm}$ in 2015. - 00010 The region of the pixel detector support tube viewed in the $x$-$y$ plane for \AbsZbarrel before background subtraction and removal of the $\phi$ regions with additional structures. The density of NI vertices is indicated by the color scale. Two circular structures are visible. The circle with the smaller radius corresponds to the BPIX detector outer shield, while the one with the larger radius is the pixel detector support tube (also visible in Fig.~\ref{fig:TrackerHadrography}). - 00007 The BPIX detector inner shield region viewed in the $x$-$y$ plane for \AbsZbarrel before background subtraction and removal of the $\phi$ regions with additional structures. The density of NI vertices is indicated by the color scale. The inner shield itself is the visible circle of radius $r = 3.8\unit{cm}$. Modules in the first BPIX detector layer are visible at larger radius. The small bumps that can be seen around the shield correspond to cables connected to the first BPIX detector layer. - 00009 (left) Photograph of one half of the BPIX detector showing longitudinal support, three layers, and inner shield. (right) Photograph showing an end of the BPIX detector while standing on the installation cassette. Optical targets, indicated by the numbers 2001, 2002, and 2003, are used to locate the BPIX detector within the CMS cavern. Photographs by Antje Behrens, CERN. - 00016 The BPIX detector inner shield with the fitted values for two half-circles of common radius \rc and centers (\xZfar, \yZfar) and (\xZnear, \yZnear) for \AbsZbarrel. The $x$-$y$ plane after background subtraction (upper), and the $r$-$\phi$ coordinates before background subtraction (lower), are shown. The density of NI vertices is indicated by the color scale. The red and black lines at around $r = 3.8\unit{cm}$ show the fitted half-circles on the far and near sides, respectively. The blue point at the center of the $x$-$y$ plane corresponds to the average beam spot position of $\xbs=0.8\unit{mm}$ and $\ybs=0.9\unit{mm}$ in 2015. Modules in the first BPIX detector layer are visible in~(lower) at larger radius. - 00018 The beam pipe region with the fitted values for a circle of radius \rc and center$(\xz, \yz)$ for \AbsZbarrel. The $x$-$y$ plane after background subtraction (upper), and the $r$-$\phi$ coordinates before background subtraction (lower), are shown. The density of NI vertices is indicated by the color scale. The red line shows the fitted circle. The blue point in the center of the $x$-$y$ plane corresponds to the average beam spot position of $\xbs=0.8\unit{mm}$ and $\ybs=0.9\unit{mm}$ in 2015. - 00004 Hadrography of the tracker detector in the $x$-$y$ plane in the barrel region (\AbsZbarrel). The density of NI vertices is indicated by the color scale. The signatures of the beam pipe, the BPIX detector with its support, and the first layer of the TIB detector can be observed above the background of misreconstructed NIs. - 00013 The pixel detector support tube with the fitted values for an ellipse with semi-minor axis \Rx, semi-major axis \Ry, and center $(\xz,\yz)$ for \AbsZbarrel. The $x$-$y$ plane after background subtraction (upper), and the $r$-$\phi$ coordinates before background subtraction (lower), are shown. The density of NI vertices is indicated by the color scale. The red line shows the fitted ellipse. The blue point in the center of the $x$-$y$ plane corresponds to the average beam spot position of $\xbs=0.8\unit{mm}$ and $\ybs=0.9\unit{mm}$ in 2015. - 00003 (upper) Schematic view of the CMS tracker detector~\cite{Chatrchyan:2008zzk}, and (lower) closeup view of the region around the original BPIX detector with labels identifying pixel detector support tube, BPIX detector outer and inner shields, three BPIX detector layers, and beam pipe. - 00011 (left) Photograph of one half of the BPIX detector showing longitudinal support, three layers, and inner shield. (right) Photograph showing an end of the BPIX detector while standing on the installation cassette. Optical targets, indicated by the numbers 2001, 2002, and 2003, are used to locate the BPIX detector within the CMS cavern. Photographs by Antje Behrens, CERN. - Fulltext - 00001 Schematic view of NI vertex reconstruction: (left) a cluster of \Pc positions (\PcOne, \PcTwo, and \PcThree) with the distance of closest approach \dm (labeled $d_{\mathrm{m1}}$), shown for \PcOne; (center) the algorithm uses the three \Pc points to identify an aggregate position \PG; (right) after refitting the track helices, the best vertex \PGpr is found with indicated incoming direction from the primary vertex position, \PV, and outgoing system. Black curves correspond to reconstructed charged particle tracks. - 00002 Schematic view of NI vertex reconstruction: (left) a cluster of \Pc positions (\PcOne, \PcTwo, and \PcThree) with the distance of closest approach \dm (labeled $d_{\mathrm{m1}}$), shown for \PcOne; (center) the algorithm uses the three \Pc points to identify an aggregate position \PG; (right) after refitting the track helices, the best vertex \PGpr is found with indicated incoming direction from the primary vertex position, \PV, and outgoing system. Black curves correspond to reconstructed charged particle tracks. - 00006 (upper) Schematic view of the CMS tracker detector~\cite{Chatrchyan:2008zzk}, and (lower) closeup view of the region around the original BPIX detector with labels identifying pixel detector support tube, BPIX detector outer and inner shields, three BPIX detector layers, and beam pipe. - 00000 Schematic view of NI vertex reconstruction: (left) a cluster of \Pc positions (\PcOne, \PcTwo, and \PcThree) with the distance of closest approach \dm (labeled $d_{\mathrm{m1}}$), shown for \PcOne; (center) the algorithm uses the three \Pc points to identify an aggregate position \PG; (right) after refitting the track helices, the best vertex \PGpr is found with indicated incoming direction from the primary vertex position, \PV, and outgoing system. Black curves correspond to reconstructed charged particle tracks. - Fulltext - Fulltext

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2018-07-08
23:12
Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos and b quarks at $\sqrt{s} = $ 13 TeV / CMS Collaboration
A search for heavy resonances, decaying into the standard model vector bosons and the standard model Higgs boson, is presented. [...]
CMS-B2G-17-004 ; CERN-EP-2018-169 ; CMS-B2G-17-004 ; CERN-EP-2018-169 ; arXiv:1807.02826 ; CMS-B2G-17-004-003.
- 2018. - 45 p, 45 p.
Additional information for the analysis - CMS AuthorList - Fulltext - Full text

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2018-07-08
22:40
Study of the underlying event in top quark pair production in pp collisions at 13 TeV / CMS Collaboration
Measurements of normalized differential cross sections as functions of the multiplicity and kinematic variables of charged-particle tracks from the underlying event in top quark and antiquark pair production are presented. [...]
CMS-TOP-17-015 ; CERN-EP-2018-177 ; CMS-TOP-17-015 ; CERN-EP-2018-177 ; arXiv:1807.02810 ; CMS-TOP-17-015-003.
- 2018. - 64 p, 64 p.
Additional information for the analysis - CMS AuthorList - Fulltext - Full text

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2018-07-05
22:36
Search for supersymmetry in events with a $ \tau $ lepton pair and missing transverse momentum in proton-proton collisions at $\sqrt{s} = $ 13 TeV / CMS Collaboration
A search for the electroweak production of supersymmetric particles in proton-proton collisions at a center-of-mass energy of 13 TeV is presented in final states with a $ \tau $ lepton pair. [...]
CMS-SUS-17-003 ; CERN-EP-2018-149 ; CMS-SUS-17-003 ; CERN-EP-2018-149 ; arXiv:1807.02048 ; CMS-SUS-17-003-003.
- 2018. - 62 p.
Additional information for the analysis - CMS AuthorList - Fulltext - Full text

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2018-07-02
21:46
Measurement of differential cross sections for inclusive isolated-photon and photon+jets production in proton-proton collisions at $\sqrt{s} = $ 13 TeV
Measurements of inclusive isolated-photon and photon+jets production in proton-proton collisions at $\sqrt{s} = $ 13 TeV are presented. [...]
CERN-EP-2018-167 ; CMS-SMP-16-003-003.
- 2018.
Additional information for the analysis - CMS AuthorList - Fulltext

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2018-06-29
14:00
Measurement of charged particle spectra in minimum-bias events from proton-proton collisions at $\sqrt{s} = $ 13 TeV / CMS Collaboration
Pseudorapidity, transverse momentum, and multiplicity distributions are measured in the pseudorapidity range $|{\eta}| < $ 2.4 for charged particles with transverse momenta satisfying ${p_{\mathrm{T}}} > $ 0.5 GeV in proton-proton collisions at a center-of-mass energy of $\sqrt{s} = $ 13 TeV. [...]
CMS-FSQ-16-011 ; CERN-EP-2018-187 ; arXiv:1806.11245 ; CMS-FSQ-16-011-003.
- 2018. - 39 p.
Additional information for the analysis - CMS AuthorList - Fulltext - Full text

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