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Benvenuti in IRIS

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Prodotti recenti

Amplitude analysis of the Λb0→pK−γ decay

The resonant structure of the radiative decay Λb0→pK−γ in the region of proton-kaon invariant-mass up to 2.5 GeV/c2 is studied using proton-proton collision data recorded at centre-of-mass energies of 7, 8, and 13 TeV collected with the LHCb detector, corresponding to a total integrated luminosity of 9 fb−1. Results are given in terms of fit and interference fractions between the different components contributing to this final state. Only Λ resonances decaying to pK− are found to be relevant,...

Precision Measurement of CP Violation in the Penguin-Mediated Decay B_{s}^{0}→ϕϕ

A flavor-tagged time-dependent angular analysis of the decay B_{s}^{0}→ϕϕ is performed using pp collision data collected by the LHCb experiment at the center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^{-1}. The CP-violating phase and direct CP-violation parameter are measured to be ϕ_{s}^{ss[over ¯]s}=-0.042±0.075±0.009 rad and |λ|=1.004±0.030±0.009, respectively, assuming the same values for all polarization states of the ϕϕ system. In these results, t...

Momentum scale calibration of the LHCb spectrometer

For accurate determination of particle masses accurate knowledge of the momentum scale of the detectors is crucial. The procedure used to calibrate the momentum scale of the LHCb spectrometer is described and illustrated using the performance obtained with an integrated luminosity of 1.6 fb−1 collected during 2016 in pp running. The procedure uses large samples of J/ → +− and B+ → J/K+ decays and leads to a relative accuracy of 3 × 10−4 on the momentum scale.

Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at s=13 TeV

The production rate of Λ0 b baryons relative to B0 mesons in pp collisions at a center-of-mass energy ffiffi s p ¼ 13 TeV is measured by the LHCb experiment. The ratio of Λ0 b to B0 production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multiplicity. At low multiplicity, the ratio measured at LHCb is consistent with the value measured in eþe− collisions, and increases by a factor of ∼2 with increasing multiplicity. At r...

Measurement of the branching fraction of B0 → J/ψπ0 decays

The ratio of branching fractions between B0 → J/ψπ0 and B+ → J/ψK∗+ decays is measured with proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1 . The measured value is BB0→J/ψπ0 BB+→J/ψK∗+ = (1.153 ± 0.053 ± 0.048) × 10−2 , where the frst uncertainty is statistical and the second is systematic. The branching fraction for B0 → J/ψπ0 decays is determined using the branching fraction of the normalisation channel, resulting i...

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Benvenuti in IRIS

Prodotti recenti

Amplitude analysis of the Λb0→pK−γ decay

Precision Measurement of CP Violation in the Penguin-Mediated Decay B_{s}^{0}→ϕϕ

Momentum scale calibration of the LHCb spectrometer

Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at s=13 TeV

Measurement of the branching fraction of B0 → J/ψπ0 decays

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