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CERN Document Server 2,050 elementer funnet  1 - 10nesteslutt  gå til element: Søket tok 5.58 sekunder. 
1.
(100)
Test of lepton universality with $B^{0} \rightarrow K^{*0}\ell^{+}\ell^{-}$ decays / LHCb Collaboration
A test of lepton universality, performed by measuring the ratio of the branching fractions of the $B^{0} \rightarrow K^{*0}\mu^{+}\mu^{-}$ and $B^{0} \rightarrow K^{*0}e^{+}e^{-}$ decays, $R_{K^{*0}}$, is presented. The $K^{*0}$ meson is reconstructed in the final state $K^{+}\pi^{-}$, which is required to have an invariant mass within 100$\mathrm{\,MeV}c^2$ of the known $K^{*}(892)^{0}$ mass. [...]
arXiv:1705.05802; LHCB-PAPER-2017-013; CERN-EP-2017-100; LHCB-PAPER-2017-013.- Geneva : CERN, 2017-08-16 - 31 p. Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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2.
(91)
Measurement of $\sigma (pp \to b\overline{b}X)$ at $\sqrt{s}$=7 TeV in the forward region / LHCb Collaboration
Decays of b hadrons into final states containing a D0 meson and a muon are used to measure the b anti-b production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In the pseudorapidity interval 2 < eta < 6 and integrated over all transverse momenta we find that the average cross-section to produce b-flavoured or anti-b-flavoured hadrons is (75.3 +/- 5.4 +/- 13.0) microbarns..
arXiv:1009.2731; CERN-PH-EP-2010-029; LHCb-PAPER-2010-002; CERN-PH-EP-2010-029; LHCb-PAPER-2010-002.- Geneva : CERN, 2010-11-08 - 8 p. - Published in : Phys. Lett. B 694 (2010) 209-216 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Rivet analyses reference
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3.
(91)
Search for long-lived scalar particles in $B^+ \to K^+ \chi (\mu^+\mu^-)$ decays / LHCb Collaboration
A search for a long-lived scalar particle $\chi$ is performed, looking for the decay ${B^+ \to K^+ \chi}$ with ${\chi \to \mu^+\mu^-}$ in $pp$ collision data corresponding to an integrated luminosity of $3\, {\rm fb}^{-1}$, collected by the LHCb experiment at centre-of-mass energies of $\sqrt{s}=7$ and 8$\,$TeV. This new scalar particle, predicted by Hidden Sector models, is assumed to have a narrow width. [...]
arXiv:1612.07818; CERN-EP-2016-302; LHCB-PAPER-2016-052.- 2017-04-14 - 9 p. - Published in : Phys. Rev. D 95 (2017) 071101 APS Open Access article: PDF; Figures: ZIP; Fulltext: arXiv:1612.07818 - PDF; 10.1103_PhysRevD.95.071101 - PDF; Supplementary information: ZIP; External link: Figures, tables and other information
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4.
(90)
First observation of a baryonic $B_s^0$ decay / LHCb Collaboration
We report the first observation of a baryonic $B_s^0$ decay, $B_s^0 \to p \kern 0.1em\overline{\kern -0.1em\Lambda} K^-$, using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of $3.0\,\mathrm{fb}^{-1}$. The branching fraction is measured to be $ \mathcal{B}(B_s^0 \to p \kern 0.1em\overline{\kern -0.1em\Lambda} K^-) + \mathcal{B}(B_s^0 \to \bar{p} \Lambda K^+) = \left[5.46 \pm 0.61 \pm 0.57 \pm 0.50 (\mathcal{B}) \pm 0.32 (f_s/f_d)\right]\times 10^{-6}, $ where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the $B^0 \to p \kern 0.1em\overline{\kern -0.1em\Lambda} \pi^-$ decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of $b$-quark hadronization probabilities $f_s/f_d$..
arXiv:1704.07908; LHCB-PAPER-2017-012; CERN-EP-2017-067.- 2017-07-25 - 10 p. - Published in : Phys. Rev. Lett. 119 (2017) 041802 Fulltext: arXiv:1704.07908 - PDF; 10.1103_PhysRevLett.119.041802 - PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Figures, tables and other information
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5.
(83)
Measurement of the effective $B^0_s \rightarrow K^+K^-$ lifetime / LHCb Collaboration
A measurement of the effective $B_s\rightarrow K^+K^-$ lifetime is presented using approximately $37 pb^{-1}$ of data collected by LHCb during 2010. This quantity can be used to put constraints on contributions from processes beyond the Standard Model in the $B_s$ meson system and is determined by two complementary approaches as $\tau_{B_s\to K^+K^-} = 1.440 \pm 0.096 (stat) \pm 0.008 (syst) \pm 0.003 (model) ps$..
arXiv:1111.0521; CERN-PH-EP-2011-167; LHCB-PAPER-2011-014; CERN-PH-EP-2011-167; LHCb-PAPER-2011-014.- Geneva : CERN, 2013-07-16 - 8 p. - Published in : Phys. Lett. B 707 (2012) 349-356 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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6.
(82)
Search for the rare decays $B^0_s \to \mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$ / LHCb Collaboration
A search for the decays $B^0_s \to \mu^+ \mu^-$ and $B^0 \to \mu^+ \mu^-$ is performed with 0.37 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 7~TeV collected by the LHCb experiment in 2011. The upper limits on the branching fractions are ${\cal B} (B^0_s \to \mu^+ \mu^-) < 1.6 \times 10^{-8}$ and ${\cal B}(B^0 \to \mu^+ \mu^-) <3.6 \times 10^{-9}$ at 95% confidence level. [...]
arXiv:1112.1600; CERN-PH-EP-2011-186; LHCB-PAPER-2011-025; CERN-PH-EP-2011-186; LHCB-PAPER-2011-025.- Geneva : CERN, 2013-07-16 - 13 p. - Published in : Phys. Lett. B 708 (2012) 55-67 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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7.
(82)
Opposite-side flavour tagging of $B$ mesons at the LHCb experiment / LHCb Collaboration
The calibration and performance of the opposite-side flavour tagging algorithms used for the measurements of time-dependent asymmetries at the LHCb experiment are described. The algorithms have been developed using simulated events and optimized and calibrated with B+ -> J/psi K+, B0 -> J/psi K*0 and B0 -> D*- mu+ nu_mu decay modes with 0.37 fb^-1 of data collected in pp collisions at sqrt(s) = 7 TeV during the 2011 physics run. [...]
arXiv:1202.4979; CERN-PH-EP-2012-039; LHCB-PAPER-2011-027; CERN-PH-EP-2012-039; LHCB-PAPER-2011-027.- Geneva : CERN, 2012-06-07 - 22 p. - Published in : Eur. Phys. J. C 72 (2012) 2022 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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8.
(82)
Measurement of the $B^\pm$ production cross-section in $pp$ collisions at $\sqrt{s}=7$ TeV / LHCb Collaboration
The production of B+- mesons in proton-proton collisions at sqrt(s)=7 TeV is studied using 35 pb-1 of data collected by the LHCb detector. The B+- mesons are reconstructed exclusively in the B+- -> J/psi K+- mode, with J/psi -> mu+ mu-. [...]
arXiv:1202.4812; CERN-PH-EP-2012-047; LHCB-PAPER-2011-043; CERN-PH-EP-2012-047; LHCB-PAPER-2011-043.- Geneva : CERN, 2012 - 7 p. - Published in : JHEP 04 (2012) 093 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: DURHAM
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9.
(82)
Measurement of $\Upsilon$ production in $pp$ collisions at $\sqrt{s} = 7$ TeV / LHCb Collaboration
The production of Upsilon(1S), Upsilon(2S) and Upsilon(3S) mesons in proton-proton collisions at the centre-of-mass energy of sqrt(s)=7 TeV is studied with the LHCb detector. The analysis is based on a data sample of 25 pb-1 collected at the Large Hadron Collider. [...]
arXiv:1202.6579; CERN-PH-EP-2012-051; LHCB-PAPER-2011-036; CERN-PH-EP-2012-051; LHCB-PAPER-2011-036.- Geneva : CERN, 2012-06-07 - 22 p. - Published in : Eur. Phys. J. C 72 (2012) 2025 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: DURHAM
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10.
(82)
Measurement of charged particle multiplicities in $pp$ collisions at $\sqrt{s}$ = 7 TeV in the forward region / LHCb Collaboration
The charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of ${\sqrt{s} =7}$TeV in different intervals of pseudorapidity $\eta$. The charged particles are reconstructed close to the interaction region in the vertex detector, which provides high reconstruction efficiency in the $\eta$ ranges $-2.5<\eta<-2.0$ and $2.0<\eta<4.5$. [...]
arXiv:1112.4592; LHCB-PAPER-2011-011; CERN-PH-EP-2011-209; LHCB-PAPER-2011-011; CERN-PH-EP-2011-209.- Geneva : CERN, 2012-04-20 - 23 p. - Published in : Eur. Phys. J. C 72 (2012) 1947 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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