Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at √s=7 TeV

Bose-Einstein correlations of same-sign charged pions, produced in protonproton 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. The charged-particle multiplicity dependence of the Bose-Einstein correlation parameters describing the correlation strength and the size of the emitting source is investigated, determining both the correlation radius and the chaoticity parameter. The measured correlation radius is found to increase as a function of increasing charged-particle multiplicity, while the chaoticity parameter is seen to decreas

Observation of the decay Λb0 → pK−μ+μ− and a search for CP violation

A search for CP violation in the decay Λb 0 → pK−μ+μ− is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λb 0 → pK−μ+μ− decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ+μ− and pK− decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].</p

Observation of B-s(0) -> K* (+/-) K -/+ and evidence for B-s(0) -> K*(-) pi(+) decays

Measurements of the branching fractions of B0s→ K∗±K∓ and B0s→ K∗±π∓ decays are performed using a data sample corresponding to 1.0 fb-1of proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 7 TeV, where the K∗± mesons are reconstructed in the K0sπ± final state. The first observation of the B0s→ K∗±K∓ decay and the first evidence for the B0s→ K∗-π+decay are reported with branching fractions B(B0s→ K∗±K∓) = (12.7±1.9±1.9) x 10-6, B(B0s→ K∗-π+) = (3.3±1.1±0.5) x 10-6, where the first uncertainties are statistical and the second are systematic. In addition, an upper limit of B(B0→ K∗±K∓) &lt; 0.4 (0.5) × 10-6 is set at 90% (95%) confidence level.</p

Publisher’s Note: First experimental study of photon polarization in radiative Bs0 decays [Phys. Rev. Lett. 118, 021801 (2017)]

Correction to https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.02180