75 research outputs found

    Measurement of b hadron lifetimes in pp collisions at root s=8TeV

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    Correction: DOI:10.1140/epjc/s10052-018-6014-7Measurements are presented of the lifetimes of the B-0, B-s(0), Lambda(0)(b), and B-c(+) hadrons using the decay channels B-0 -> J/psi K*(892)(0), B-0 -> J/psi K-S(0), B-s(0) -> J/psi pi(+)pi(-), B-s(0) -> J/psi phi(1020), Lambda(0)(b) -> J/psi Lambda(0), and B-c(+) -> J/psi pi(+). The data sample, corresponding to an integrated luminosity of 19.7 fb(-1), was collected by the CMS detector at the LHC in proton-proton collisions at root s = 8TeV. The B-0 life-time is measured to be 453.0 +/- 1.6 (stat) +/- 1.8 (syst) mu m in J/psi K*(892)(0) and 457.8 +/- 2.7 (stat) +/- 2.8 (syst) mu m in J/psi K-S(0), which results in a combined measurement of c tau(0) = 454.1 +/- 1.4 (stat) +/- 1.7 (syst) mu m. The effective lifetime of the B-s(0) meson is measured in two decay modes, with contributions from different amounts of the heavy and light eigenstates. This results in two different measured lifetimes: c tau(0)(Bs) -> J/psi pi(+)pi(-) = 502.7 +/- 10.2 (stat) +/- 3.4 (syst) mu m and c tau(0)(Bs) -> J/psi phi(1020) = 443.9 +/- 2.0 (stat) +/- 1.5 (syst) mu m. The Lambda(0)(b) lifetime is found to be 442.9 +/- 8.2 (stat) +/- 2.8 (syst) mu m. The precision from each of these channels is as good as or better than previous measurements. The B-c(+) lifetime, measured with respect to the B+ to reduce the systematic uncertainty, is 162.3 +/- 7.8 (stat) +/- 4.2 (syst) +/- 0.1 (tau(B+)) mu m. All results are in agreement with current world-average values.Peer reviewe

    Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at=2.76 TeV

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    Measurement of b hadron lifetimes in pp collisions at √ s = 8TeV

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    Measurements are presented of the lifetimes of the B0 , Bs0 , Λb0 , and Bc+ hadrons using the decay channels B0→J/ψK∗(892)0 , B0→J/ψKS0 , Bs0→J/ψπ+π- , Bs0→J/ψϕ(1020) , Λb0→J/ψΛ0 , and Bc+→J/ψπ+ . The data sample, corresponding to an integrated luminosity of 19.7 fb-1 , was collected by the CMS detector at the LHC in proton–proton collisions at s=8TeV . The B0 lifetime is measured to be 453.0±1.6(stat)±1.8(syst)μm in J/ψK∗(892)0 and 457.8±2.7(stat)±2.8(syst)μm in J/ψKS0 , which results in a combined measurement of cτB0=454.1±1.4(stat)±1.7(syst)μm . The effective lifetime of the Bs0 meson is measured in two decay modes, with contributions from different amounts of the heavy and light eigenstates. This results in two different measured lifetimes: cτBs0→J/ψπ+π-=502.7±10.2(stat)±3.4(syst)μm and cτBs0→J/ψϕ(1020)=443.9±2.0(stat)±1.5(syst)μm . The Λb0 lifetime is found to be 442.9±8.2(stat)±2.8(syst)μm . The precision from each of these channels is as good as or better than previous measurements. The Bc+ lifetime, measured with respect to the B+ to reduce the systematic uncertainty, is 162.3±7.8(stat)±4.2(syst)±0.1(τB+)μm . All results are in agreement with current world-average values

    A Measurement of Tau Polarization in Z0 Decays

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    Contains fulltext : 26841___.PDF (publisher's version ) (Open Access

    Measurement of hadron and lepton-pair production at 161 GeV<root s<172 GeV at LEP

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    Contains fulltext : 26256.pdf (publisher's version ) (Open Access

    Measurement of hadron and lepton-pair production at 130 GeV<root s<140 GeV at LEP

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    Contains fulltext : 26240.pdf (publisher's version ) (Open Access

    High Mass Photon Pairs in L+L-Gamma-Gamma Events at Lep

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    Contains fulltext : 29797.PDF (publisher's version ) (Open Access

    A Test of Quantum Electrodynamics in the Reaction E+E- -]Gamma-Gamma(Gamma)

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    Contains fulltext : 26858___.PDF (publisher's version ) (Open Access

    A Measurement of Pi-Polarization at Lep

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    Contains fulltext : 26223.pdf (publisher's version ) (Open Access

    Inclusive J-Production in Z(0) Decays

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    Contains fulltext : 26831___.PDF (publisher's version ) (Open Access
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