LHCb Conference Contributions

2013-04-25
12:00
 Study of the $J/\psi$ production cross-section in proton-lead collisions at $\sqrt{s_{\rm {\small{NN}}}} = 5~\mathrm{TeV}$ /LHCb Collaboration The production of $J/\psi$ mesons is studied in proton-lead collisions with the \mbox{LHCb} detector, at a proton-nucleon centre-of-mass energy $\sqrt{s_{\rm {\small{NN}}}} = 5~\mathrm{TeV}$ The nuclear attenuation factor is determined and results are compared with theoretical predictions. The analysis is based on a data sample corresponding to an integrated luminosity of about $1~\mathrm{nb}^{-1}$.. LHCb-CONF-2013-008; CERN-LHCb-CONF-2013-008.- Geneva : CERN, 2013 - 15 p. Fulltext: LHCb-CONF-2013-008 - PDF; figs - RAR;

2013-04-05
09:50
 Measurement of the cross-section for $Z\rightarrow\mu\mu$ production with 1 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$=7 TeV /LHCb Collaboration A measurement of the cross-section for $Z\rightarrow\mu\mu$ is presented using LHCb data recorded in 2011. The cross-section is measured for muons with a transverse momentum larger than 20 GeV/c in the pseudorapidity range 2.0 < $\eta$ <4.5. [...] LHCb-CONF-2013-007; CERN-LHCb-CONF-2013-007.- Geneva : CERN, 2013 - 22 p. Fulltext: LHCb_CONF_2013_007_Plots - ZIP; LHCb-CONF-2013-007 - PDF; In : XXI. International Workshop on Deep-Inelastic Scattering and Related Subjects, Marseilles, Provence, France, 22 - 26 Apr 2013

2013-04-05
09:38
 Improved constraints on $\gamma$ from $B^\pm\to DK^\pm$ decays including first results on 2012 data /LHCb Collaboration Preliminary results for the CKM angle $\gamma$ are presented, from a combination of measurements using $B^\pm\to DK^\pm$ decays, where $D$ denotes an admixture of $D^0$ and $\overline{D}^0$ mesons. Results for the $D$ final states $K^+K^-$, $\pi^+\pi^-$, $K^\pm \pi^\mp$, and $K^\pm \pi^\mp \pi^\pm \pi^\mp$ are based on a dataset corresponding to $1\,{\rm fb}^-1$ of integrated luminosity recorded at $\sqrt{s}=7\,{\rm TeV}$ in 2011. [...] LHCb-CONF-2013-006; CERN-LHCb-CONF-2013-006.- Geneva : CERN, 2013 - 8 p. Fulltext: LHCb-CONF-2013-006_Figures - ZIP; LHCb-CONF-2013-006 - PDF; In : 14th International Conference on B-Physics at Hadron Machines, Bologna, Italy, 8 - 12 Apr 2013

2013-03-19
10:51
 Graphical comparison of the LHCb measurements of $W$ and $Z$ boson production with ATLAS and CMS /LHCb Collaboration Differential production cross-sections for the $W$ boson as a function of the pseudorapidity of the lepton and for the $Z$ boson as a function of the rapidity of the $Z$ boson measured by LHCb are compared graphically to those measured by ATLAS and CMS. A similar comparison is made for the $W$ lepton charge asymmetry as a function of the lepton pseudorapidity for different thresholds on the transverse momentum of the lepton. [...] LHCb-CONF-2013-005; CERN-LHCb-CONF-2013-005.- Geneva : CERN, 2013 - 13 p. Fulltext: LHCb-CONF-2013-005 - PDF; FIG-CONF-2013-005 - ZIP; In : Working Group on Electroweak precision measurements at the LHC, Geneva, Switzerland, 15 - 16 Apr 2013

2013-03-18
09:11
 Model-independent measurement of $CP$ violation parameters in $B^{\pm}\to(K^{0}_{\rm S}h^{+}h^{-})_{D}K^{\pm}$ decays /LHCb Collaboration The following $CP$ violating observables are measured in a model-independent analysis of $B^{\pm}\to(K^{0}_{\rm S}h^{+}h^{-})_{D}K^{\pm}$ (where $h = \pi, K$) decays reconstructed in a data sample corresponding to an integrated luminosity of 2.0~fb$^{-1}$ of $pp$ interactions collected by the LHCb experiment at a centre-of-mass energy of 8~TeV in 2012 \begin{align*} x_+ & = (-8.7 \pm 3.1 \pm 1.6 \pm 0.6) \times 10^{-2}, \\ x_- & = \phantom{-} ( 5.3 \pm 3.2 \pm 0.9 \pm 0.9) \times 10^{-2}, \\ y_+ & = \phantom{-} ( 0.1 \pm 3.6 \pm 1.4 \pm 1.9) \times 10^{-2}, \\ y_- & = \phantom{-} ( 9.9 \pm 3.6 \pm 2.2 \pm 1.6) \times 10^{-2}, \end{align*} where the first uncertainty is statistical, the second arises from systematic effects from the method or detector considerations and the third from external strong-phase measurements used in the fit. These results are combined with those obtained in the equivalent analysis of LHCb data collected in 2011. [...] LHCb-CONF-2013-004; CERN-LHCb-CONF-2013-004.- Geneva : CERN, 2013 - 17 p. Fulltext: LHCb-CONF-2013-004 - PDF; Figs-LHCb-CONF-2013-004 - ZIP; In : 14th International Conference on B-Physics at Hadron Machines, Bologna, Italy, 8 - 12 Apr 2013

2013-03-01
10:47
 A search for time-integrated CP violation in $D^0\rightarrow K^-K^+$ and $D^0\rightarrow \pi^-\pi^+$ decays /LHCb Collaboration The preliminary results of a search for time-integrated $CP$ violation in $D^0\rightarrow K^-K^+$ and in $D^0\rightarrow \pi^-\pi^+$ decays performed with a dataset corresponding to an integrated luminosity of $1.0~\mathrm{fb}^{-1}$ collected by LHCb in 2011 are presented. The flavour of the initial state ($D^0$ or $\overline{D}^0$) is identified by the charge of the soft pion ($\pi^+_s$) in the $D^{*+}\rightarrow D^0\pi_s^+$ decay. [...] LHCb-CONF-2013-003; CERN-LHCb-CONF-2013-003.- Geneva : CERN, 2013 - 20 p. Fulltext: figs-CONF-2013-003 - ZIP; LHCb-CONF-2013-003 - PDF; In : 48th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 9 - 16 Mar 2013

2013-02-20
10:41
 Measurement of $\sigma(b \bar{b})$ with inclusive final states /LHCb Collaboration A measurement of the cross section for the production of $b\bar{b}$ pairs based on $b$ inclusive final states is presented using LHCb data collected from $pp$ collisions at $\sqrt s$= 7 TeV in 2010, corresponding to an integrated luminosity of $\sim$18 pb$^{-1}$. The inclusive $b\bar{b}$ sample is selected on the basis of decay vertices displaced from the primary interaction. [...] LHCb-CONF-2013-002; CERN-LHCb-CONF-2013-002.- Geneva : CERN, 2013 - 15 p. Fulltext: Figures - ZIP; LHCb-CONF-2013-002 - PDF; In : 2013 Aspen Winter Conference on particle physics: Higgs Quo Vadis, Aspen, CO, USA, 10 - 16 Mar 2013

2013-02-20
10:37
 Measurement of the forward-central $b\bar{b}$ production asymmetry /LHCb Collaboration A measurement of the forward-central $b\bar{b}$ production asymmetry is reported based on data collected by {\mbox{LHCb}\xspace} in 2011 at $\sqrt{s} = 7$~TeV corresponding to an integrated luminosity of 1.0~fb$^{-1}$. Events are selected that have two identified $b$ jets, one of which is flavor tagged by the presence of a displaced muon with high momentum. [...] LHCb-CONF-2013-001; CERN-LHCb-CONF-2013-001.- Geneva : CERN, 2013 - 11 p. Fulltext: LHCb-CONF-2013-001 - PDF; LHCb-CONF-2013-001-figs - TAR; In : 2013 Aspen Winter Conference on particle physics: Higgs Quo Vadis, Aspen, CO, USA, 10 - 16 Mar 2013

2012-10-26
14:10
 First analysis of the $p$Pb pilot run data with LHCb /LHCb Collaboration A first analysis of the data taken during the proton-lead pilot run is presented. The data sample corresponds to an integrated luminosity of $L_{\rm int}$ = 0.93 $\pm$ 0.05 $\mu$b$^{-1}$ [...] LHCb-CONF-2012-034; CERN-LHCb-CONF-2012-034.- Geneva : CERN, 2012 - 15 p. Fulltext: LHCb-CONF-2012-034 - PDF; figures - ZIP; In : Workshop on Multi-Parton Interactions at the LHC, CERN, Geneva, Switzerland, 3 - 7 Dec 2012

2012-10-10
10:54
 Optimization and calibration of the same-side kaon tagging algorithm using hadronic $B_{s}^{0}$ decays in 2011 data /LHCb Collaboration We report on the optimization and calibration of the same-side kaon tagging algorithm using the decay $B_{s}^{0} \rightarrow D_{s}^{- \pi^{+}}$ with 1.0~$\mathrm{fb}^{-1}$ of data from the LHCb 2011 physics run. After a data-driven optimization and calibration, we measured an effective tagging efficiency for the same-side tagger of $(1.5\pm0.4)%$ using event-by-event predicted mistag for $B_{s}^{0} \rightarrow D_{s}^{- \pi^{+}}$ decays. [...] LHCb-CONF-2012-033; CERN-LHCb-CONF-2012-033.- Geneva : CERN, 2012 - 12 p. Fulltext: figs - ZIP; LHCb-CONF-2012-033 - PDF; In : Hadron Collider Physics Symposium 2012, Kyoto, Japan, 12 - 16 Nov 2012