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CERN Document Server 找到 2,051 笔记录  1 - 10下一个最後  跳到记录: 检索需时 4.12 秒. 
1.
(100)
Observation of charmonium pairs produced exclusively in $pp$ collisions / LHCb collaboration
A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of $3{\rm\ fb}^{-1}$ collected at centre-of-mass energies of 7 and 8 TeV, $J/\psi J/\psi$ and $J/\psi\psi(2S)$ pairs are observed, which have been produced in the absence of any other activity inside the LHCb acceptance that is sensitive to charged particles in the pseudorapidity ranges $(-3.5,-1.5)$ and $(1.5,5.0)$. [...]
arXiv:1407.5973; CERN-PH-EP-2014-174; LHCB-PAPER-2014-027; LHCB-PAPER-2014-027; CERN-PH-EP-2014-174.- Geneva : CERN, 2014-09-19 - 20 p. - Published in : J. Phys. G 41 (2014) 115002 Fulltext: PDF; IOP Open Access article: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
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2.
(91)
Measurements of the branching fractions and $C\!P$ asymmetries of $B^{\pm} \to J\!/\!\psi\, \pi^{\pm}$ and $B^{\pm} \to \psi(2S) \pi^{\pm}$ decays / LHCb Collaboration
A study of $B^{\pm} \to J\!/\!\psi\, \pi^{\pm}$ and $B^{\pm} \to \psi(2S) \pi^{\pm}$ decays is performed with data corresponding to $0.37\,{\rm fb}^{-1}$ of proton-proton collisions at $\sqrt{s}=7\,\mathrm{Te\kern -0.1em V}$. Their branching fractions are found to be \begin{eqnarray*} \mathcal{B}(B^{\pm} \to J\!/\!\psi\, \pi^{\pm}) &=& (3.88 \pm 0.11 \pm 0.15) \times 10^{-5}\ {\rm and}\\ \mathcal{B}(B^{\pm} \to \psi(2S) \pi^{\pm}) &=& (2.52 \pm 0.26 \pm 0.15) \times 10^{-5}, \end{eqnarray*} where the first uncertainty is related to the statistical size of the sample and the second quantifies systematic effects. [...]
arXiv:1203.3592; LHCB-PAPER-2011-024; CERN-PH-EP-2012-070; LHCB-PAPER-2011-024; CERN-PH-EP-2012-070.- Geneva : CERN, 2012 - 10 p. - Published in : Phys. Rev. D 85 (2012) 091105(R) APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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3.
(89)
Measurement of the CP violating phase $\phi_s$ in $\overline{B}^0_s \to J/\psi f_0(980)$ / LHCb Collaboration
Measurement of mixing-induced $CP$ violation in $\overline{B}^0_s$ decays is of prime importance in probing new physics. So far only the channel $\overline{B}^0_s\to J/\psi\phi$ has been used. [...]
arXiv:1112.3056; CERN-PH-EP-2011-205; LHCB-PAPER-2011-031; CERN-PH-EP-2011-205; LHCB-PAPER-2011-031.- Geneva : CERN, 2013-07-16 - 9 p. - Published in : Phys. Lett. B 707 (2012) 497-505 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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4.
(87)
Measurement of $J/\psi$ production in $pp$ collisions at $\sqrt{s}$ = 7 TeV / LHCb Collaboration
The production of J/psi mesons in proton-proton collisions at sqrt(s)=7 TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/psi production is measured as a function of the J/psi transverse momentum pT and rapidity y in the fiducial region 0<pT<14 GeV/c and 2.0<y<4.5. [...]
arXiv:1103.0423; LHCb-PAPER-2011-003; CERN-PH-EP-2011-018; CERN-PH-EP-2011-018; LHCb-PAPER-2011-003.- Geneva Geneva : CERN, 2011 - 24 p. - Published in : Eur. Phys. J. C 71 (2011) 1645 Fulltext: PDF; LHCB-JPSI-007 (2011-02-28): PDF; Springer Open Access article: PDF; External link: DURHAM
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5.
(85)
Observation of $\overline{B}^0_s \to J/\psi f'_2(1525)$ in $J/\psi K^+K^-$ final states / LHCb Collaboration
In this Letter the decay $\overline{B}^0_s \to J/\psi K^+ K^-$ is investigated. Although the $J/\psi \phi$ channel is well known, final states at higher $K^+K^-$ masses have not previously been studied. [...]
arXiv:1112.4695; CERN-PH-EP-2011-212; LHCB-PAPER-2011-026; CERN-PH-EP-2011-212; LHCB-PAPER-2011-026.- Geneva : CERN, 2012 - 8 p. - Published in : Phys. Rev. Lett. 108 (2012) 151801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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6.
(83)
Measurements of the Branching fractions for $B_{(s)} \to D_{(s)}\pi\pi\pi$ and $\Lambda_b^0 \to \Lambda_c^+\pi\pi\pi$ / LHCb Collaboration
Branching fractions of the decays $H_b\to H_c\pi^-\pi^+\pi^-$ relative to $H_b\to H_c\pi^-$ are presented, where $H_b$ ($H_c$) represents $\overline{B^0}$ ($D^+$), $B^-$ ($D^0$), $\overline{B_s^0}$ ($D_s^+$) and $\Lambda_b^0$ ($\Lambda_c^+$). The measurements are performed with the LHCb detector using 35~${\rm pb^{-1}}$ of data collected at $\sqrt{s}=7$~TeV. [...]
arXiv:1109.6831; LHCB-PAPER-2011-016; CERN-PH-EP-2011-151; LHCB-PAPER-2011-016; CERN-PH-EP-2011-151.- Geneva : CERN, 2011 - 26 p.
APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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7.
(83)
First observation of $B^{0}_{s} \to J/\psi f_{0}$(980) decays / LHCb Collaboration
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay $B^{0}_{s} \to J/\psi f_{0}$(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the $B^0_s$ system. [...]
arXiv:1102.0206; CERN-PH-EP-2011-011; LHCb-PAPER-2011-002; LHCB-PAPER-2011-002; CERN-PH-EP-2011-011; LHCb-PAPER-2011-002.- 2013-07-16 - 8 p. - Published in : Phys. Lett. B 698 (2011) 115-122 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint
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8.
(81)
Strong constraints on the rare decays $B^0_s \to \mu^+ \mu^-$ and $B^0 \to \mu^+ \mu^-$ / LHCb Collaboration
A search for $B^0_s \to \mu+ \mu^-$ and $B^0 \to \mu^+ \mu^-$ decays is performed using $1.0$ fb$^{-1}$ of $pp$ collision data collected at $\sqrt{s}=7$\,TeV with the LHCb experiment at the Large Hadron Collider. For both decays the number of observed events is consistent with expectation from background and Standard Model signal predictions. [...]
arXiv:1203.4493; CERN-PH-EP-2012-072; LHCB-PAPER-2012-007; CERN-PH-EP-2012-072; LHCB-PAPER-2012-007.- Geneva : CERN, 2012 - 6 p. - Published in : Phys. Rev. Lett. 108 (2012) 231801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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9.
(81)
Application of vertex and mass constraints in track-based alignment / Amoraal, J. (NIKHEF, Amsterdam) ; Blouw, J. (Heidelberg U.) ; Blusk, S. (Syracuse U.) ; Borghi, S. (Glasgow U. ; Manchester U.) ; Cattaneo, M. (CERN) ; Chiapolini, N. (Zurich U.) ; Conti, G. (LPHE, Lausanne) ; Deissenroth, M. (Heidelberg U.) ; Dupertuis, F. (LPHE, Lausanne) ; van der Eijk, R. (NIKHEF, Amsterdam) et al.
The software alignment of planar tracking detectors using samples of charged particle trajectories may lead to global detector distortions that affect vertex and momentum resolution. We present an alignment procedure that constrains such distortions by making use of samples of decay vertices reconstructed from two or more trajectories and putting constraints on their invariant mass. [...]
arXiv:1207.4756.- 2013 - 18 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 712 (2013) 48-55 Fulltext: PDF; External link: Preprint
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10.
(80)
Measurement of the $\bar{B}^0_s$ effective lifetime in the $J/\psi f_0(980)$ final state / LHCb Collaboration
The effective lifetime of the $\overline{B}^0_s$ meson in the decay mode $\overline{B}^0_s \to J\psi f_0(980)$ is measured using 1.0fb$^{-1}$ of data collected in $pp$ collisions at $\sqrt{s} = 7$,TeV with the LHCb detector. The result is $1.700 \pm 0.040 \pm 0.026 \,\mathrm{ps}$ where the first uncertainty is statistical and the second systematic. [...]
arXiv:1207.0878; LHCb-PAPER-2012-017; CERN-PH-EP-2012-180; LHCB-PAPER-2012-017; CERN-PH-EP-2012-180.- Geneva : CERN, 2012 - 14 p. - Published in : Phys. Rev. Lett. 109 (2012) 152002 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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