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LHCb Conference Contributions

Darreres entrades:
2015-02-12
11:10
Study of the decay $B^+ \rightarrow K^+\pi^0$ at LHCb /LHCb Collaboration
This analysis investigates the ability of LHCb to measure the decay mode $B^+ \rightarrow K^+\pi^0$. This serves as a prototype analysis for decay channels with similar topologies, such as the $B^0 \rightarrow K^0\pi^0$, the $B^0 \rightarrow K^0\pi^0\gamma$, and the $\Lambda_b \rightarrow \Lambda\gamma$ decays, which involve photons in the final state and lack a reconstructed decay vertex. [...]
LHCb-CONF-2015-001; CERN-LHCb-CONF-2015-001.- Geneva : CERN, 2015
In : 50th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 14 - 21 Mar 2015

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2014-09-12
16:31
Improved constraints on $\gamma$: CKM2014 update /LHCb Collaboration
We report on an updated combination of all currently available tree-level measurements of the CKM angle $\gamma$ from LHCb. We use results obtained from time integrated analyses of $B^+ \to Dh^+$ and $B^0 \to DK^{*0}$ decays, where $h^+$ corresponds to either $K^+$ or $\pi^+$ and the D meson decays into $K^+ K^-, \pi^+ \pi^-, K^{\pm}\pi^{\mp}, K_s^0K^{\pm}\pi^{\mp}, K_s^0\pi^{\pm}\pi^{\mp}, K_s^0K^{\pm}K^{\mp}$, and $K^{\pm}\pi^{\mp}\pi^{\pm}\pi^{\mp}$. [...]
LHCB-CONF-2014-004; CERN-LHCb-CONF-2014-004.- Geneva : CERN, 2014 Fulltext: PDF; Related data file(s): ZIP; External link: Previous draft version
In : 8th International Workshop on the CKM Unitarity Triangle, Univ. Tech., Vienna, Austria, 08 - 12 Sep 2014

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2014-08-08
16:08
Reference pp cross-sections for $\Upsilon(1S)$ studies in proton-lead collisions at $\sqrt{s_{NN}} = 5.02$ TeV and comparisons between ALICE and LHCb results /LHCb Collaboration ; ALICE Collaboration
The ALICE and LHCb collaborations have studied $\Upsilon$ (1$S$) production at large rapidities in proton-lead collisions at $\sqrt{s_{NN}} = 5.02$ TeV at the LHC using di-muon fi nal states. The evaluation of cold nuclear matter effects requires the knowledge of the corresponding $\Upsilon$ (1$S$) production cross section in $pp$ collisions at the same centre-of-mass energy and in the same kinematic range. [...]
LHCb-CONF-2014-003; CERN-LHCb-CONF-2014-003; ALICE-PUBLIC-2014-002.- Geneva : CERN, 2014 - 20 p. Fulltext: PDF;

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2014-07-31
17:12
Measurement of the forward $W$ boson cross-section in $pp$ collisions at $\sqrt{s} = 7\mathrm{\,Te\kern -0.1em V}$ /LHCb Collaboration
A measurement of the inclusive $W \to \mu\nu$ production cross-section using data from $pp$ collisions at a centre-of-mass energy of $\sqrt{s} = 7\mathrm{\,Te\kern -0.1em V}$ is presented. The analysis is based on an integrated luminosity of about 1.0 fb$^{-1}$ recorded with the LHCb detector. [...]
LHCb-CONF-2014-002; CERN-LHCb-CONF-2014-002.- Geneva : CERN, 2014 - 27 p. Fulltext: PDF; Related data file(s): ZIP;
In : 37th International Conference on High Energy Physics, Valencia, Spain, 2 - 9 Jul 2014

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2014-07-31
16:28
Search for pair production of long-lived heavy charged stau particles with LHCb /LHCb Collaboration
The minimal Gauge Mediated Supersymmetry Breaking (mGMSB) model predicts that the next-to-lightest Supersymmetric Particle is the $stau$, the charged, massive, and long-lived bosonic super-partner to the tau. We have analysed data collected at the LHCb experiment in 2011 and 2012 corresponding to a total of about 3 fb$^{−1}$, searching for pairs of particles which can be identified as staus with masses between 124 and 309 GeV/c$^2$. [...]
LHCb-CONF-2014-001; CERN-LHCb-CONF-2014-001.- Geneva : CERN, 2014 - 15 p. Fulltext: LHCb-CONF-2014-001 - PDF; cds - ZIP;
In : 10th Rencontres du Vietnam - Flavour Physics Conference, Quy Nhon, Vietnam, 27 Jul - 2 Aug 2014

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2013-12-22
21:13
Reference $pp$ cross-sections for $J/\psi$ studies in proton-lead collisions at $\sqrt{s_{NN}} = 5.02$~TeV and comparisons between ALICE and LHCb results /ALICE Collaboration ; LHCb Collaboration
The ALICE and LHCb collaborations have studied $J/\psi$ production at forward rapidities in proton-lead collisions at $\sqrt{s}=5.02$~TeV using the dimuon channel. The evaluation of cold nuclear matter effects requires the knowledge of the corresponding $J/\psi$ cross-section in $pp$ collisions at the same centre-of-mass energy and in the same kinematic range. [...]
LHCb-CONF-2013-013; CERN-LHCb-CONF-2013-013; ALICE-PUBLIC-2013-002.- Geneva : CERN, 2013 Figures: ZIP; Fulltext: PDF;

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2013-07-25
00:31
Combination of results on the rare decays $B^0_{(s)} \to \mu^+\mu^-$ from the CMS and LHCb experiments /CMS and LHCb Collaborations
A combination of results on the rare decays $B^0_s \to \mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$ from the CMS and LHCb experiments is performed. After accounting for known correlations, the average time-integrated branching fraction of the decay $B^0_s \to \mu^+\mu^-$ is determined to be ${\cal B}(B^0_{s} \to \mu^+\mu^-) = (2.9 \pm 0.7) \times 10^{-9}$ where the uncertainties include both statistical and systematic sources..
CMS-PAS-BPH-13-007; LHCb-CONF-2013-012; CERN-LHCb-CONF-2013-012.- Geneva : CERN, 2013 - 6 p. Fulltext: Figure_001-b-thumb - PDF PNG; manifest - XML; Figure_002-a - PDF PNG; Figure_002-b - PDF PNG; Figure_001-a - PDF PNG; LHCb-CONF-2013-012_Figures - ZIP; Fulltext (CMS): PDF; Fulltext (LHCb): PDF;
In : EPS-HEP 2013 European Physical Society Conference on High Energy Physics, Stockholm, Sweden, 18 - 24 Jul 2013

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2013-07-02
16:33
Updated average $f_s/f_d$ $b$-hadron production fraction ratio for 7 TeV $pp$ collisions /LHCb Collaboration
Improved knowledge of the branching fraction of the decay $D_{s}^{-} \to K^{+}K^{-}\pi^{-}$ and of the $B$ meson lifetimes has an impact on the measurement of the ratio of $B^{0}$ and $B_{s}^{0}$ meson production cross-sections, $f_{s}/f_{d}$, measured at LHCb. This note reports a new combination of the LHCb measurements of $f_s/f_d$, resulting in \mbox{$f_{s}/f_{d} = 0.259 \pm 0.015$}..
LHCb-CONF-2013-011; CERN-LHCb-CONF-2013-011.- Geneva : CERN, 2013 - 6 p. Fulltext: PDF;
In : EPS-HEP 2013 European Physical Society Conference on High Energy Physics, Stockholm, Sweden, 18 - 24 Jul 2013

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2013-06-17
16:17
Search for the $\Lambda_{b}^{0} \rightarrow \Lambda \eta^{\prime}$ decay at LHCb /LHCb Collaboration
A search is performed for the as yet unobserved baryonic $\Lambda_{b}^{0} \rightarrow \Lambda \eta^{\prime}$ decay with a total integrated luminosity of 2 fb$^{-1}$ of 8 TeV data recorded by the LHCb experiment in 2012. The $B^{0} \rightarrow K_{\rm S}^{0} \eta^{\prime}$ decay is used as a control channel, and the relative branching fraction of these two decays is measured. [...]
LHCb-CONF-2013-010; CERN-LHCb-CONF-2013-010.- Geneva : CERN, 2013 - 15 p. Fulltext: LHCb-CONF-2013-010 - PDF; final_figs - ZIP;
In : EPS-HEP 2013 European Physical Society Conference on High Energy Physics, Stockholm, Sweden, 18 - 24 Jul 2013

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2013-06-17
10:55
$C\!P$ and up-down asymmetries in $B^{\pm}\!\to\! K^{\pm}\pi^{\mp}\pi^{\pm}\gamma$ decays /LHCb Collaboration
We present the first study of the flavour-changing neutral-current radiative $B^+\!\to\! K^+\pi^-\pi^+\gamma$ decay at LHCb. More than 8000 signal events are reconstructed and selected using a data sample corresponding to an integrated luminosity of $2\,$fb$^{-1}$, collected in $pp$ collisions at $\sqrt{s} = 8$ TeV in 2012. [...]
LHCb-CONF-2013-009; CERN-LHCb-CONF-2013-009.- Geneva : CERN, 2013 - 16 p. Fulltext: LHCb-CONF-FIG-2013-009 - ZIP; LHCb-CONF-2013-009 - PDF;
In : EPS-HEP 2013 European Physical Society Conference on High Energy Physics, Stockholm, Sweden, 18 - 24 Jul 2013

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