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EP Articles

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2017-10-17
16:52
Measurement of the $B^{\pm}$ production cross-section in pp collisions at $\sqrt{s} =$ 7 and 13 TeV / LHCb Collaboration
The production of $B^{\pm}$ mesons is studied in $pp$ collisions at centre-of-mass energies of 7 and 13 TeV, using $B^{\pm}\rightarrow J/\psi K^{\pm}$ decays and data samples corresponding to 1.0 fb$^{-1}$ and 0.3 fb$^{-1}$, respectively. The production cross-sections summed over both charges and integrated over the transverse momentum range $0<p_{\text{T}}< 40$ GeV/$c$ and the rapidity range $2.0<y<4.5$ are measured to be $\sigma(pp \rightarrow B^{\pm} X, \sqrt{s} = \text{7 TeV}) = 43.0 \pm 0.2 \pm 2.5 \pm 1.7\mu b,$ $\sigma(pp \rightarrow B^{\pm} X, \sqrt{s} = \text{13 TeV}) = 86.6 \pm 0.5 \pm 5.4 \pm 3.4\mu b,$ where the first uncertainties are statistical, the second are systematic, and the third are due to the limited knowledge of the $B^{\pm}\rightarrow J/\psi K^{\pm}$ branching fraction. [...]
CERN-EP-2017-254; LHCB-PAPER-2017-037; arXiv:1710.04921; LHCB-PAPER-2017-037.- Geneva : CERN, 2017 - 22 p. - Published in : JHEP 1712 (2017) 026 Article from SCOAP3: PDF; Preprint: 1710.04921 - PDF; arXiv:1710.04921 - PDF; Related data file(s): ZIP;

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2017-09-18
16:32
Measurement of $CP$ observables in $B^{\pm} \rightarrow D K^{*\pm}$ decays using two- and four-body $D$ final states / LHCb Collaboration
Measurements of $CP$ observables in $B^{\pm} \rightarrow D K^{*\pm}$ decays are presented, where $D$ denotes a superposition of $D^0$ and $\overline{D^0}$ meson states. Decays of the $D$ meson to $K^{-}\pi^{+}$, $K^{-}K^{+}$, $\pi^{-}\pi^{+}$, $K^{-}\pi^{+}\pi^{-}\pi^{+}$ and $\pi^{-}\pi^{+}\pi^{-}\pi^{+}$ are used and the $K^{*\pm}$ meson is reconstructed in the $K^{0}_{\mathrm{S}}\pi^{\pm}$ final state. [...]
LHCB-PAPER-2017-030; CERN-EP-2017-208; arXiv:1709.05855; LHCB-PAPER-2017-030.- Geneva : CERN, 2017-11-23 - 27 p. - Published in : JHEP 11 (2017) 156 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP;

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2017-09-15
14:53
Precise measurement of the $\chi_{c1}$ and $\chi_{c2}$ resonance parameters with the decays $\chi_{c1,c2}\to J/\psi\mu^+\mu^-$ / LHCb Collaboration
The decays $\chi_{c1} \rightarrow J/\psi \mu^+ \mu^-$ and $\chi_{c2} \rightarrow J/\psi \mu^+ \mu^-$ are observed and used to study the resonance parameters of the $\chi_{c1}$ and $\chi_{c2}$ mesons. The masses of these states are measured to be m(\chi_{c1}) = 3510.71 \pm 0.04(stat) \pm 0.09(syst)MeV\,, m(\chi_{c2}) = 3556.10 \pm 0.06(stat) \pm 0.11(syst)MeV\,, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. [...]
CERN-EP-2017-228; LHCB-PAPER-2017-036; arXiv:1709.04247; LHCB-PAPER-2017-036.- Geneva : CERN, 2017-11-28 - 9 p. - Published in : Phys. Rev. Lett. 119 (2017) 221801 Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2017-09-14
12:21
Measurement of $CP$ violation in $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$ decays / LHCb Collaboration
A measurement is presented of decay-time-dependent $CP$ violation in the decays $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$, where the $J/\psi$ is reconstructed from two electrons and the $\psi(2S)$ from two muons. The analysis uses a sample of $pp$ collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\mathrm{fb}^{-1}$. [...]
LHCB-PAPER-2017-029; CERN-EP-2017-209; arXiv:1709.03944; LHCB-PAPER-2017-029.- Geneva : CERN, 2017-11-27 - 18 p. - Published in : JHEP 11 (2017) 170 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP;

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2017-09-12
11:56
First observation of forward $Z \rightarrow b \bar{b}$ production in $pp$ collisions at $\sqrt{s}=8$ TeVMeasurement of forward $Z \rightarrow b \bar{b}$ production in $pp$ collisions at $\sqrt{s}=8$~TeV / LHCb Collaboration
The decay $Z \rightarrow b \bar{b}$ is reconstructed in $pp$ collision data, corresponding to 2 fb$^{-1}$ of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of $\sqrt{s}=8$ TeV. The product of the $Z$ production cross-section and the $Z \rightarrow b \bar{b}$ branching fraction is measured for candidates in the fiducial region defined by two $b$-quark jets with pseudorapidities in the range $2.2 < \eta < 4.2$, with transverse momenta $p_{\mathrm{T}}>20$ GeV and dijet invariant mass in the range $45 < m_{jj} < 165$ GeV. [...]
LHCB-PAPER-2017-024; CERN-EP-2017-211; arXiv:1709.03458; LHCB-PAPER-2017-024-AND-CERN-EP-2017-211; LHCB-PAPER-2017-024.- Geneva : CERN, 2018-01-10 - 10 p. - Published in : Phys. Lett. B 776 (2018) 430-439 Article from SCOAP3: PDF; Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP;

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2017-09-08
16:35
Measurement of the shape of the $\Lambda_b^0\to\Lambda_c^+ \mu^- \overline{\nu}_{\mu}$ differential decay rate / LHCb Collaboration
A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay $\Lambda_b^0\to\Lambda_c^+\mu^-\overline{\nu}$ is reported, using data corresponding to $3 fb^{-1}$ collected with the LHCb detector in proton-proton collisions. The $\Lambda_c^+\mu^-\overline{\nu}$(+ anything) final states are reconstructed through the detection of a muon and a $\Lambda_c^+$ baryon decaying into $pK^-\pi^+$, and the decays $\Lambda_b^0\to\Lambda_c^+\pi^+\pi^-\mu^-\overline{\nu}$ are used to determine contributions from $\Lambda_b^0\to \Lambda_c^{\star+}\mu ^-\bar{\nu}$ decays. [...]
CERN-EP-2017-164; LHCB-PAPER-2017-016; arXiv:1709.01920; CERN-PH-EP-2017-164.- Geneva : CERN, 2017-12-13 - 15 p. - Published in : Phys. Rev. D 96 (2017) 112005 Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP;

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2017-09-08
10:15
Bose-Einstein correlations of same-sign charged pions in the forward region in $pp$ collisions at $\sqrt{s}$ = 7 TeV / LHCb Collaboration
Bose-Einstein correlations of same-sign charged pions, produced in proton-proton collisions at a 7 TeV centre-of-mass energy, are studied using a data sample collected by the LHCb experiment. The signature for Bose-Einstein correlations is observed in the form of an enhancement of pairs of like-sign charged pions with small four-momentum difference squared. [...]
CERN-EP-2017-203; LHCB-PAPER-2017-025; arXiv:1709.01769; LHCB-PAPER-2017-025.- Geneva : CERN, 2017-12-06 - Published in : JHEP 12 (2017) 025 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP;

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2017-09-08
10:09
First observation of the rare purely baryonic decay $B^0 \to p \bar{p}$ / LHCb Collaboration
The first observation of the decay of a $B^0$ meson to a purely baryonic final state, $B^0 \to p \bar{p}$, is reported. The proton-proton collision data sample used was collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponds to an integrated luminosity of 3.0 fb$^{-1}$. [...]
LHCB-PAPER-2017-022; CERN-EP-2017-190; arXiv:1709.01156; LHCB-PAPER-2017-022.- Geneva : CERN, 2017-12-04 - 10 p. - Published in : Phys. Rev. Lett. 119 (2017) 232001 Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2017-09-05
12:23
Measurement of the $\Upsilon$ polarizations in $pp$ collisions at $\sqrt{s}$=7 and 8TeV / LHCb Collaboration
The polarization of the $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S) $mesons, produced in $pp$ collisions at centre-of-mass energies $\sqrt{s}$=7 and 8TeV, is measured using data samples collected by the LHCb experiment, corresponding to integrated luminosities of 1 and 2fb$^{-1}$, respectively. The measurements are performed in three polarization frames, using $\Upsilon\to\mu^+\mu^-$ decays in the kinematic region of the transverse momentum $p_{T}(\Upsilon)<30~GeV/c$, and rapidity $2.2< y^{(\Upsilon)}<4.5$. [...]
CERN-EP-2017-210; LHCB-PAPER-2017-028; arXiv:1709.01301; LHCB-PAPER-2017-028.- Geneva : CERN, 2017-12-20 - 61 p. - Published in : JHEP 12 (2017) 110 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2017-08-22
10:19
Study of $b\bar{b}$ correlations in high energy proton-proton collisions / LHCb Collaboration
Kinematic correlations for pairs of beauty hadrons, produced in high energy proton-proton collisions, are studied. The data sample used was collected with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV and corresponds to an integrated luminosity of 3 fb$^{-1}$. [...]
CERN-EP-2017-178; LHCB-PAPER-2017-020; arXiv:1708.05994; LHCB-PAPER-2017-020.- Geneva : CERN, 2017-11-08 - 29 p. - Published in : JHEP 11 (2017) 030 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP;

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