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PH-EP Articles

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2017-02-10
07:38
Flow dominance and factorization of transverse momentum correlations in Pb-Pb collisions at the LHC / ALICE Collaboration
We present the first measurement of the two-particle transverse momentum differential correlation function, $P_2\equiv\langle \Delta p_{\rm T} \Delta p_{\rm T} \rangle /\langle p_{\rm T} \rangle^2$, in Pb-Pb collisions at $\sqrt{s_{_{\rm NN}}} =$ 2.76 TeV. Results for $P_2$ are reported as a function of relative pseudorapidity ($\Delta \eta$) and azimuthal angle ($\Delta \varphi$) between two particles for different collision centralities. [...]
CERN-EP-2017-021; arXiv:1702.02665.- Geneva : CERN, 2017 - 16 p. - Published in : Phys. Rev. Lett. 118 (2017) 162302 APS Open Access article: PDF; Fulltext: PDF;

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2017-01-31
07:18
Observation of the suppressed decay $\Lambda^{0}_{b}\rightarrow p\pi^{-}\mu^{+}\mu^{-}$ / LHCb Collaboration
The suppressed decay $\Lambda^{0}_{b}\rightarrow p\pi^{-}\mu^{+}\mu^{-}$, excluding the $J/\psi$ and $\psi(2S)\rightarrow \mu^{+}\mu^{-}$ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of $3\mathrm{fb}^{-1}$ collected with the LHCb experiment. [...]
LHCB-PAPER-2016-049; CERN-EP-2016-312; arXiv:1701.08705.- Geneva : CERN, 2017 - 16 p. - Published in : J. High Energy Phys. 04 (2017) 029 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF;

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2017-01-30
11:57
Production of muons from heavy-flavour hadron decays in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV / ALICE collaboration
The production of muons from heavy-flavour hadron decays in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV was studied for $2<p_{\rm T}<16$ GeV/$c$ with the ALICE detector at the CERN LHC. The measurement was performed at forward (p-going direction) and backward (Pb-going direction) rapidity, in the ranges of rapidity in the center-of-mass system (cms) $2.03<y_{\rm cms}<3.53$ and $-4.46<y_{\rm cms}<-2.96$, respectively. [...]
CERN-EP-2017-022; arXiv:1702.01479.- Geneva : CERN, 2017 - 25 p. - Published in : 10.1016/j.physletb.2017.03.049 Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1702.01479 - PDF; CERN-EP-2017-022 - PDF;

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2017-01-21
07:23
Measurement of the $B^{\pm}$ production asymmetry and the $CP$ asymmetry in $B^{\pm} \to J/\psi K^{\pm}$ decays / LHCb Collaboration
The $B^{\pm}$ meson production asymmetry in $pp$ collisions is measured using $B^+ \to \bar{D}^0 \pi^+$ decays. The data were recorded by the LHCb experiment during Run 1 of the LHC at centre-of-mass energies of $\sqrt{s}=$ 7 and 8 TeV [...]
LHCB-PAPER-2016-054; CERN-EP-2016-325; arXiv:1701.05501; LHCB-PAPER-2016-054-CERN-EP-2016-325; LHCB-PAPER-2016-054.- Geneva : CERN, 2017 - 19 p. - Published in : Phys. Rev. D 95 (2017) 052005 APS Open Access article: PDF; Fulltext: arXiv:1701.05501 - PDF; 10.1103_PhysRevD.95.052005 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

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2017-01-21
07:23
Measurement of charged-particle distributions sensitive to the underlying event in $\sqrt{s} = 13$ TeV proton-proton collisions with the ATLAS detector at the LHC / ATLAS Collaboration
We present charged-particle distributions sensitive to the underlying event, measured by the ATLAS detector in proton-proton collisions at a centre-of-mass energy of 13 TeV, in low-luminosity Large Hadron Collider fills corresponding to an integrated luminosity of 1.6 nb$^{-1}$. The distributions were constructed using charged particles with absolute pseudorapidity less than 2.5 and with transverse momentum greater than 500 MeV, in events with at least one such charged particle with transverse momentum above 1 GeV. [...]
CERN-EP-2016-28; CERN-EP-2016-285; arXiv:1701.05390.- 2017 - 40 p. - Published in : J. High Energy Phys. 03 (2017) 157 Fulltext: PDF; Springer Open Access article: PDF;

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2017-01-09
11:13
Observation of $B_{c}^{+} \rightarrow D^{0} K^{+}$ decays / LHCb Collaboration
Using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, recorded by the LHCb detector at centre-of-mass energies of 7 and 8 TeV, the $B_{c}^{+} \rightarrow D^{0} K^{+}$ decay is observed with a statistical significance of 5.1 standard deviations. By normalising to $B^{+} \rightarrow \bar{D}^{0} \pi^{+}$ decays, a measurement of the branching fraction multiplied by the production rates for $B_{c}^{+}$ relative to $B^{+}$ mesons in the LHCb acceptance is obtained, $R_{D^{0} K} = \frac{f_{c}}{f_{u}} \times \mathcal{B}(B_{c}^{+} \rightarrow D^{0} K^{+}) = (9.3\,^{+2.8}_{-2.5} \pm 0.6) \times 10^{-7}$ , where the first uncertainty is statistical and the second is systematic. [...]
LHCB-PAPER-2016-058; CERN-EP-2016-314; arXiv:1701.01856; LHCB-PAPER-2016-058.- Geneva : CERN, 2017 - 15 p. - Published in : Phys. Rev. Lett. 118 (2017) 111803 APS Open Access article: PDF; Fulltext: arXiv:1701.01856 - PDF; 10.1103_PhysRevLett.118.111803 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

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2017-01-09
07:28
Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at $ \sqrt{s} = $ 13 TeV / CMS Collaboration
A search for dark matter and unparticle production at the LHC has been performed using events containing two charged leptons (electrons or muons), consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 fb$^{-1}$ of proton-proton collisions at the LHC, at a center-of-mass energy of 13 TeV. [...]
CMS-EXO-16-010; CERN-EP-2016-309; FERMILAB-PUB-17-011-CMS; arXiv:1701.02042; CMS-EXO-16-010.- Geneva : CERN, 2017 - 42 p. - Published in : J. High Energy Phys. 1703 (2017) 061 Fulltext: fermilab-pub-17-011-cms - PDF; arXiv:1701.02042 - PDF; Springer Open Access article: PDF; External link: FERMILABPUB

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2016-12-29
16:15
Search for massive resonances decaying into WW, WZ or ZZ bosons in proton-proton collisions at $\sqrt{s} = $ 13 TeV / CMS Collaboration
A search is presented for new massive resonances decaying to WW, WZ or ZZ bosons in $\ell\nu\mathrm{q\bar{q}}$ and $\mathrm{q\bar{q}}\mathrm{q\bar{q}}$ final states. Results are based on data corresponding to an integrated luminosity of 2.3-2.7 fb$^{-1}$ recorded in proton-proton collisions at $\sqrt{s} = $ 13 TeV with the CMS detector at the LHC. [...]
CMS-B2G-16-004; CERN-EP-2016-296; arXiv:1612.09159.- Geneva : CERN, 2017 - 52 p. - Published in : J. High Energy Phys. 03 (2017) 162 Fulltext: PDF; Springer Open Access article: PDF;

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2016-12-27
08:08
Search for long-lived scalar particles in $B^+ \to K^+ \chi (\mu^+\mu^-)$ decays / LHCb Collaboration
A search for a long-lived scalar particle $\chi$ is performed, looking for the decay ${B^+ \to K^+ \chi}$ with ${\chi \to \mu^+\mu^-}$ in $pp$ collision data corresponding to an integrated luminosity of $3\, {\rm fb}^{-1}$, collected by the LHCb experiment at centre-of-mass energies of $\sqrt{s}=7$ and 8$\,$TeV. This new scalar particle, predicted by Hidden Sector models, is assumed to have a narrow width. [...]
CERN-EP-2016-302; LHCB-PAPER-2016-052; arXiv:1612.07818.- 2017 - 15 p. - Published in : Phys. Rev. D 95 (2017) 071101 APS Open Access article: PDF; Fulltext: PDF;

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2016-12-23
07:36
Observation of $B_{c}^{+} \to J/\psi D^{(*)} K^{(*)}$ decays / LHCb Collaboration
A search for the decays $B_c^+ \to J/\psi D^{(*)0} K^+$ and $B_c^+ \to J/\psi D^{(*)+} K^{*0}$ is performed with data collected at the LHCb experiment corresponding to an integrated luminosity of 3 fb$^{-1}$. The decays $B_c^+ \to J/\psi D^0 K^+$ and $B_c^+ \to J/\psi D^{*0} K^+$ are observed for the first time, while first evidence is reported for the $B_c^+ \to J/\psi D^{*+} K^{*0}$ and $B_c^+ \to J/\psi D^+ K^{*0}$ decays. [...]
CERN-EP-2016-303; LHCB-PAPER-2016-055; arXiv:1612.07421.- Geneva : CERN, 2017 - 20 p. - Published in : Phys. Rev. 95 (2017) 032005 APS Open Access article: PDF; Fulltext: 10.1103_PhysRevD.95.032005 - PDF; arXiv:1612.07421 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

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