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PH-EP Articles

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2016-12-16
09:33
Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions / LHCb Collaboration
Measurements of the cross-section for producing $b$ quarks in the reaction $pp \to b\overline{b}X$ are reported in $7$ and $13 TeV$ collisions at the LHC as a function of the pseudorapidity $\eta$ in the range $2<\eta<5$ covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of b-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. [...]
arXiv:1612.05140; LHCB-PAPER-2016-031; CERN-EP-2016-201.- Geneva : CERN, 2017 - 21 p. - Published in : Phys. Rev. Lett. 118 (2017) 052002 Fulltext: arXiv:1612.05140 - PDF; 10.1103_PhysRevLett.118.052002 - PDF; Related data file(s): ZIP;

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2016-12-09
07:44
Observation of the decay $\Xi_b^- \to p K^-K^-$ / LHCb Collaboration
Decays of the $\Xi_b^-$ and $\Omega_b^-$ baryons to the charmless final states $p h^{-}h^{\prime -}$, where $h^{(\prime)}$ denotes a kaon or pion, are searched for with the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at centre-of-mass energies $\sqrt{s} = 7$ and $8 TeV$, corresponding to an integrated luminosity of $3 {\rm fb}^{-1}$. [...]
CERN-EP-2016-294; LHCB-PAPER-2016-050; arXiv:1612.02244; LHCB-PAPER-2016-050; CERN-EP-2016-294.- Geneva : CERN, 2017 - 11 p. - Published in : Phys. Rev. Lett. 118 (2017) 071801 Fulltext: 10.1103_PhysRevLett.118.071801 - PDF; arXiv:1612.02244 - PDF; Related data file(s): TAR.GZ;

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2016-11-12
22:22
Search for dijet resonances in proton-proton collisions at $\sqrt{s}=$ 13 TeV and constraints on dark matter and other models / CMS Collaboration
A search is presented for narrow resonances decaying to dijet final states in proton-proton collisions at $\sqrt{s}= $ 13 TeV using data corresponding to an integrated luminosity of 12.9 fb$^{-1}$. The dijet mass spectrum is well described by a smooth parameterization and no significant evidence for the production of new particles is observed. [...]
arXiv:1611.03568; CERN-EP-2016-277; CMS-EXO-16-032.- Geneva : CERN, 2017 - 32 p. - Published in : Phys. Lett. B xx (2017) xx Fulltext: PDF; External link: Preprint

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2016-11-10
07:44
Measurement of the CKM angle $\gamma$ from a combination of LHCb results / LHCb collaboration
A combination of measurements sensitive to the CKM angle $\gamma$ from LHCb is performed. The inputs are from analyses of time-integrated $B^{+}\rightarrow DK^+$, $B_{d}^{0} \rightarrow D K^{*0}$, $B_{d} \rightarrow D K^+ \pi^-$ and $B^{+} \rightarrow D K^+\pi^+\pi^-$ tree-level decays. [...]
arXiv:1611.03076; LHCB-PAPER-2016-032; CERN-EP-2016-270.- Geneva : CERN, 2016 - 58 p. - Published in : J. High Energy Phys. 12 (2016) 087 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF;

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2016-10-31
09:06
Search for magnetic monopoles with the MoEDAL forward trapping detector in 13 TeV proton-proton collisions at the LHC / The MoEDAL collaboration
MoEDAL is designed to identify new physics in the form of long-lived highly-ionising particles produced in high-energy LHC collisions. Its arrays of plastic nuclear-track detectors and aluminium trapping volumes provide two independent passive detection techniques. [...]
CERN-EP-2016-282; arXiv:1611.06817.- Geneva : CERN, 2017 - 6. - Published in : Phys. Rev. Lett. 118 (2017) 061801 Draft (restricted): PDF; Fulltext: 10.1103_PhysRevLett.118.061801 - PDF; arXiv:1611.06817 - PDF; CERN-EP-2016-282 - PDF; External link: Preprint

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2016-10-28
17:18
Measurements of $\psi(2S)$ and $X(3872) \to J/\psi\pi^+\pi^-$ production in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector / ATLAS Collaboration
Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states $X(3872)$ and $\psi(2S)$, in the decay mode $J/\psi \pi^+\pi^-$, measured using 11.4 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 8$ TeV by the ATLAS detector at the LHC. The ratio of cross-sections $X(3872)/\psi(2S)$ is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of $X(3872)$ and $\psi(2S)$. [...]
CERN-EP-2016-193; arXiv:1610.09303.- Geneva : CERN, 2017 - 42 p. - Published in : J. High Energy Phys. 01 (2017) 117 Fulltext: PDF;

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2016-10-27
08:35
Measurement of forward $t\overline{t}$, $W+b\overline{b}$ and $W+c\overline{c}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV / LHCb collaboration
The production of $t\overline{t}$, $W+b\overline{b}$ and $W+c\overline{c}$ is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 $\pm$ 0.02 $\mbox{fb}^{-1}$. The $W$ bosons are reconstructed in the decays $W\rightarrow\ell\nu$, where $\ell$ denotes muon or electron, while the $b$ and $c$ quarks are reconstructed as jets. [...]
arXiv:1610.08142; LHCB-PAPER-2016-038; CERN-EP-2016-232.- Geneva : CERN, 2017 - 20 p. - Published in : Phys. Lett. B 767 (2017) 110-120 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2016-10-24
11:33
Measurement of the $ZZ$ production cross section in proton--proton collisions at $\mathbf{\sqrt{s} = 8 TeV}$ using the $ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $ZZ\to\ell^{-}\ell^{+}\nu\bar{\nu}$ decay channels with the ATLAS detector / ATLAS Collaboration
A measurement of the $ZZ$ production in the $\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $\ell^{-}\ell^{+}\nu\bar{\nu}$ channels $(\ell = e, \mu)$ in proton--proton collisions at $\sqrt{s} = 8$ TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fb$^{-1}$ collected by the ATLAS experiment in 2012 is presented. The fiducial cross sections for $ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $ZZ\to \ell^{-}\ell^{+}\nu\bar{\nu}$ are measured in selected phase-space regions. [...]
CERN-EP-2016-194; arXiv:1610.07585.- Geneva : CERN, 2017 - 55 p. - Published in : J. High Energy Phys. 01 (2017) 099 Fulltext: PDF;

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2016-10-18
08:01
Observation of the decay $B^0_s \to \phi\pi^+\pi^-$ and evidence for $B^0 \to \phi\pi^+\pi^-$ / LHCb collaboration
The first observation of the rare decay Bs0→ϕπ+π- and evidence for B0→ϕπ+π- are reported, using pp collision data recorded by the LHCb detector at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3  fb-1. The branching fractions in the π+π- invariant mass range 400<m(π+π-)<1600  MeV/c2 are [3.48±0.23±0.17±0.35]×10-6 and [1.82±0.25±0.41±0.14]×10-7 for Bs0→ϕπ+π- and B0→ϕπ+π- respectively, where the uncertainties are statistical, systematic and from the normalization mode Bs0→ϕϕ. [...]
arXiv:1610.05187; LHCB-PAPER-2016-028; CERN-EP-2016-213.- Geneva : CERN, 2017 - 25 p. - Published in : Phys. Rev. D 95 (2017) 012006 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2016-10-17
17:47
Search for $R$-parity violating supersymmetry with displaced vertices in proton-proton collisions at $\sqrt{s}= $ 8 TeV / CMS Collaboration
Results are reported from a search for $R$-parity violating supersymmetry in proton-proton collision events collected by the CMS experiment at a center-of-mass energy of $\sqrt{s}=$ 8 TeV. The data sample corresponds to an integrated luminosity of 17.6 fb$^{-1}$. [...]
CERN-EP-2016-224; arXiv:1610.05133; CMS-SUS-14-020.- Geneva : CERN, 2017 - 38 p. - Published in : Phys. Rev. D 95 (2017) 012009 Fulltext: arXiv:1610.05133 - PDF; 10.1103_PhysRevD.95.012009 - PDF; External link: Preprint

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