Search for the Xb and other hidden-beauty states in the π+π−ϒ(1S) channel at ATLAS

This Letter presents a search for a hidden-beauty counterpart of the X(3872) in the mass ranges of 10.05–10.31 GeV and 10.40–11.00 GeV, in the channel Xb→π+π−ϒ(1S)(→μ+μ−), using 16.2 fb−1 of pp   collision data collected by the ATLAS detector at the LHC. No evidence for new narrow states is found, and upper limits are set on the product of the Xb cross section and branching fraction, relative to those of the ϒ(2S), at the 95% confidence level using the CLS approach. These limits range from 0.8% to 4.0%, depending on mass. For masses above 10.1 GeV, the expected upper limits from this analysis are the most restrictive to date. Searches for production of the ϒ(13DJ), , and states also reveal no significant signals

Measurement of CPCP asymmetries in D±→η′π±D^{\pm}\rightarrow \eta^{\prime} \pi^{\pm} and Ds±→η′π±D_s^{\pm}\rightarrow \eta^{\prime} \pi^{\pm} decays

See paper for full list of authors - All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-041.html - Submitted to Phys. Lett. BInternational audienceA search for CP violation in D±→η′π± and D±s→η′π± decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 3 fb−1, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The measured CP-violating charge asymmetries are ACP(D±→η′π±)=(−0.61±0.72±0.55±0.12)% and ACP(D±s→η′π±)=(−0.82±0.36±0.24±0.27)%, where the first uncertainties are statistical, the second systematic, and the third are the uncertainties on the ACP(D±→K0Sπ±) and ACP(D±s→ϕπ±) measurements used for calibration. The results represent the most precise measurements of these asymmetries to date

Measurement of B0B^0, Bs0B^0_s, B+B^+ and Λb0\Lambda^0_b production asymmetries in 7 and 8 TeV proton-proton collisions

See paper for full list of authors - All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-062.html - Submitted to Phys. Lett. B.International audienceThe B0, B0s, B+ and Λ0b hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The measurements are performed as a function of transverse momentum and rapidity of the b hadrons within the LHCb detector acceptance. The overall production asymmetries, integrated over transverse momentum and rapidity, are also determined

Observation of the Xi(-)(b) -> J/psi Lambda K- decay

The observation of the decay \u39eb 12\u2192J/\u3c8\u39bK 12 is reported, using a data sample corresponding to an integrated luminosity of 3fb 121, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of \u39eb 12 baryons detected in the decay \u39eb 12\u2192J/\u3c8\u39bK 12 is measured relative to that of \u39bb0 baryons using the decay \u39bb0\u2192J/\u3c8\u39b. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0<4.5, the measured ratio is [Formula presented][Formula presented]=(4.19\ub10.29 (stat)\ub10.15 (syst)) 710 122, where f\u39ejavax.xml.bind.JAXBElement@67eb61c6javax.xml.bind.JAXBElement@119b9f1d and f\u39bjavax.xml.bind.JAXBElement@129b214cjavax.xml.bind.JAXBElement@3a65d854 are the fragmentation fractions of b\u2192\u39eb 12 and b\u2192\u39bb0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between \u39eb 12 and \u39bb0 baryons is measured to be M(\u39eb 12) 12M(\u39bb0)=177.08\ub10.47 (stat)\ub10.16 (syst)MeV/c2