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1.
Study of B0Dπ+ππ+B0Dπ+ππ+ and B0DK+ππ+B0DK+ππ+ decays / LHCb Collaboration
Using proton-proton collision data collected by the LHCb experiment at s=s= 7 TeV, corresponding to an integrated luminosity of 1.0 fb11, the ratio of branching fractions of the B0Dπ+ππ+B0Dπ+ππ+ decay relative to the B0Dπ+B0Dπ+ decay is measured to be B(B0Dπ+ππ+)B(B0Dπ+)=2.64±0.04(stat.)±0.13(syst.).B(B0Dπ+ππ+)B(B0Dπ+)=2.64±0.04(stat.)±0.13(syst.). The Cabibbo-suppressed decay B0DK+ππ+B0DK+ππ+ is observed for the first time and the measured ratio of branching fractions is \begin{equation*} \frac{\mathcal{B}(B^{0}\rightarrow D^{*-}K^{+}\pi^{-}\pi^{+})}{\mathcal{B}(B^{0} \rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+})} = (6.47 \pm 0.37\,(\text{stat.}) \pm 0.35\,(\text{syst.})) \times 10^{-2} \label{eq:CS_BF_ratio_result}\, . [...]
arXiv:1303.6861; LHCB-PAPER-2012-046; CERN-PH-EP-2013-041; CERN-EP-PH-2013-041; LHCB-PAPER-2012-046; CERN-PH-EP-2013-041.- Geneva : CERN, 2013-05-03 - 10 p. - Published in : Phys. Rev. D 87 (2013) 092001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
2.
Measurement of the B0K0e+eB0K0e+e branching fraction at low dilepton mass / LHCb Collaboration
The branching fraction of the rate decay B0K0e+eB0K0e+e in the dilepton mass region from 30 to 1000 MeV/c2/c2 has been measured by the LHCb experiment, using pppp collision data, corresponding to an integrated luminosity of 1.0 fb11, at a centre-of-mass energy of 7 TeV. The decay mode B0J/ψ(e+e)K0B0J/ψ(e+e)K0 is utilized as a normalization channel. [...]
arXiv:1304.3035; LHCB-PAPER-2013-005; CERN-PH-EP-2013-048; LHCB-PAPER-2013-005-CERN-PH-EP-2013-048; LHCB-PAPER-2013-005; CERN-PH-EP-2013-048.- Geneva : CERN, 2013 - 13 p. - Published in : JHEP 05 (2013) 159 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
3.
Measurements of the branching fractions of B+pˉpK+B+p¯pK+ decays / LHCb Collaboration
The branching fractions of the decay B+pˉpK+B+p¯pK+ for different intermediate states are measured using data, corresponding to an integrated luminosity of 1.0 fb11, collected by the LHCb experiment. The total branching fraction, its charmless component (Mpˉp<2.85(Mp¯p<2.85 GeV/c2)GeV/c2) and the branching fractions via the resonant cˉcc¯c states ηc(1S)ηc(1S) and ψ(2S)ψ(2S) relative to the decay via a J/ψJ/ψ intermediate state are B(B+pˉpK+)totalB(B+J/ψK+pˉpK+)=4.91±0.19(stat)±0.14(syst),B(B+pˉpK+)Mpˉp<2.85GeV/c2B(B+J/ψK+pˉpK+)=2.02±0.10(stat)±0.08(syst),B(B+ηc(1S)K+pˉpK+)B(B+J/ψK+pˉpK+)=0.578±0.035(stat)±0.027(syst),B(B+ψ(2S)K+pˉpK+)B(B+J/ψK+pˉpK+)=0.080±0.012(stat)±0.009(syst).B(B+p¯pK+)totalB(B+J/ψK+p¯pK+)=4.91±0.19(stat)±0.14(syst),B(B+p¯pK+)Mp¯p<2.85GeV/c2B(B+J/ψK+p¯pK+)=2.02±0.10(stat)±0.08(syst),B(B+ηc(1S)K+p¯pK+)B(B+J/ψK+p¯pK+)=0.578±0.035(stat)±0.027(syst),B(B+ψ(2S)K+p¯pK+)B(B+J/ψK+p¯pK+)=0.080±0.012(stat)±0.009(syst). Upper limits on the B+B+ branching fractions into the ηc(2S)ηc(2S) meson and into the charmonium-like states X(3872)X(3872) and X(3915)X(3915) are also obtained..
arXiv:1303.7133; LHCB-PAPER-2012-047; CERN-PH-EP-2013-040; LHCB-PAPER-2012-047; CERN-PH-EP-2013-040.- Geneva : CERN, 2013-06-13 - 14 p. - Published in : Eur. Phys. J. C 73 (2013) 2462 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
4.
Search for rare B0(s)μ+μμ+μB0(s)μ+μμ+μ decays / LHCb Collaboration
A search for the decays B0sμ+μμ+μB0sμ+μμ+μ and B0μ+μμ+μB0μ+μμ+μ is performed using data, corresponding to an integrated luminosity of 1.0 fb11, collected with the LHCb detector in 2011. The number of candidates observed is consistent with the expected background and, assuming phase-space models of the decays, limits on the branching fractions are set: B(B0sμ+μμ+μ)<1.6 (1.2)×108B(B0sμ+μμ+μ)<1.6 (1.2)×108 and B(B0μ+μμ+μ)<6.6 (5.3)×109B(B0μ+μμ+μ)<6.6 (5.3)×109 at 95% (90%) confidence level. [...]
arXiv:1303.1092; CERN-PH-EP-2013-031; LHCB-PAPER-2012-049; CERN-PH-EP-2013-031; LHCB-PAPER-2012-049.- Geneva : CERN, 2013 - 6 p. - Published in : Phys. Rev. Lett. 110 (2013) 1528276 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
5.
Prompt charm production in pppp collisions at ss = 7 TeV / LHCb Collaboration
Charm production at the LHC in pppp collisions at ss = 7 TeV is studied with the LHCb detector. The decays D0Kπ+D0Kπ+, D+Kπ+π+D+Kπ+π+, D+D0(Kπ+)π+D+D0(Kπ+)π+, D+sϕ(KK+)π+D+sϕ(KK+)π+, Λ+cpKπ+Λ+cpKπ+, and their charge conjugates are analysed in a data set corresponding to an integrated luminosity of 15 nb11. [...]
arXiv:1302.2864; LHCB-PAPER-2012-041; CERN-PH-EP-2013-009; LHCB-PAPER-2012-041; CERN-PH-EP-2013-009.- Geneva : CERN, 2013-06-01 - 20 p. - Published in : Nucl. Phys. B 871 (2013) 1-20 Elsevier Open Access article: LHCb-1-20 - PDF; npb.871.1 - PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Rivet analyses reference
6.
Amplitude analysis and the branching fraction measurement of ˉB0sJ/ψK+K¯B0sJ/ψK+K / LHCb Collaboration
An amplitude analysis of the final state structure in the ¯B0sJ/ψK+K¯¯¯¯B0sJ/ψK+K decay mode is performed using 1.0 fb11.0 fb1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy pppp collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. [...]
arXiv:1302.1213; LHCB-PAPER-2012-040; CERN-PH-EP-2013-008; LHCB-PAPER-2012-040; CERN-PH-EP-2013-008.- Geneva : CERN, 2013-04-08 - 23 p. - Published in : Phys. Rev. D 87 (2013) 072004 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
7.
Measurement of the Λ0bΛ0b, ΞbΞb and ΩbΩb baryon masses / LHCb Collaboration
Bottom baryons decaying to a J/ψJ/ψ meson and a hyperon are reconstructed using 1.0 fb11.0 fb1 of data collected in 2011 with the LHCb detector. Significant Λ0bJ/ψΛΛ0bJ/ψΛ, ΞbJ/ψΞΞbJ/ψΞ and ΩbJ/ψΩΩbJ/ψΩ signals are observed and the corresponding masses are measured to be M(Λ0b)=5619.53±0.13(stat)±0.45(syst)MeV/c2,M(Ξb)=5795.8±0.9(stat)±0.4(syst)MeV/c2,M(Ωb)=6046.0±2.2(stat)±0.5(syst)MeV/c2,M(Λ0b)=5619.53±0.13(stat)±0.45(syst)MeV/c2,M(Ξb)=5795.8±0.9(stat)±0.4(syst)MeV/c2,M(Ωb)=6046.0±2.2(stat)±0.5(syst)MeV/c2, while the diffierences with respect to the Λ0bΛ0b mass are M(Ξb)M(Λ0b)=176.2±0.9(stat)±0.1(syst)MeV/c2,M(Ωb)M(Λ0b)=426.4±2.2(stat)±0.4(syst)MeV/c2.M(Ξb)M(Λ0b)=176.2±0.9(stat)±0.1(syst)MeV/c2,M(Ωb)M(Λ0b)=426.4±2.2(stat)±0.4(syst)MeV/c2. These are the most precise mass measurements of the Λ0bΛ0b, ΞbΞb and ΩbΩb baryons to date. [...]
arXiv:1302.1072; CERN-PH-EP-2013-013; LHCB-PAPER-2012-048; CERN-PH-EP-2013-013; LHCB-PAPER-2012-048.- Geneva : CERN, 2013-05-02 - 8 p. - Published in : Phys. Rev. Lett. 110 (2013) 182001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
8.
Exclusive J/ψψ and ψψ(2S) production in pppp collisions at s=7s=7 TeV / LHCb Collaboration
Exclusive J/ψJ/ψ and ψ(2S)ψ(2S) vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between 2.0 and 4.5 are measured to be σppJ/ψ(μ+μ)(2.0<ημ±<4.5)=307±21±36 pb,σppJ/ψ(μ+μ)(2.0<ημ±<4.5)=307±21±36 pb, σppψ(2S)(μ+μ)(2.0<ημ±<4.5)=7.8±1.3±1.0 pb,σppψ(2S)(μ+μ)(2.0<ημ±<4.5)=7.8±1.3±1.0 pb, where the first uncertainties are statistical and the second are systematic. [...]
arXiv:1301.7084; CERN-PH-EP-2013-005; LHCB-PAPER-2012-044; CERN-PH-EP-2013-005; LHCB-PAPER-2012-044.- Geneva : CERN, 2013 - 17 p. - Published in : J. Phys. G 40 (2013) 045001 IOP Open Access article: PDF; Related data file(s): ZIP; External link: Preprint
9.
Analysis of the resonant components in ¯B0J/ψπ+π¯¯¯¯B0J/ψπ+π / LHCb collaboration
Interpretation of CP violation measurements using charmonium decays, in both the B0 and Bs systems, can be subject to changes due to "penguin" type diagrams. These effects can be investigated using measurements of the Cabibbo-suppressed B0->J/\psi pi+pi- decays. [...]
arXiv:1301.5347; LHCB-PAPER-2012-045; CERN-PH-EP-2013-004; LHCB-PAPER-2012-045; CERN-PH-EP-2013-004.- Geneva : CERN, 2013-03-01 - 21 p. - Published in : Phys. Rev. D 87 (2013) 052001 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
10.
Measurement of the fragmentation fraction ratio fs/fdfs/fd and its dependence on BB meson kinematics / LHCb collaboration
The relative production rate of B0sB0s and B0B0 mesons is determined with the hadronic decays B0sDsπ+B0sDsπ+ and B0DK+B0DK+. The measurement uses data corresponding to 1.0 fb11 of pppp collisions at a centre-of-mass energy of s=7s=7 TeV recorded in the forward region with the LHCb experiment. [...]
arXiv:1301.5286; CERN-PH-EP-2013-006; LHCB-PAPER-2012-037; CERN-PH-EP-2013-006; LHCB-PAPER-2012-037.- Geneva : CERN, 2013 - 18 p. - Published in : JHEP 04 (2013) 001 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint

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42 Sobczak, K.
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1 Sobczak, Krzysztof Grzegorz
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