The production of χb mesons in proton-proton collisions is studied using a data sample collected by the LHCb detector, at centre-of-mass energies of √ s = 7 and 8 TeV and corresponding to an integrated luminosity of 3.0 fb−1. The χb mesons are identified through their decays to Υ(1S)γ and Υ(2S)γ using photons that converted to e +e − pairs in the detector. The relative prompt production rate of χb1(1P) and χb2(1P) mesons is measured as a function of the Υ(1S) transverse momentum in the χb rapidity range 2.0 < y < 4.5. A precise measurement of the χb(3P) mass is also performed. Assuming a mass splitting between the χb1(3P) and the χb2(3P) states of 10.5 MeV/c2, the measured mass of the χb1(3P) meson is m(χb1(3P)) = 10515.7 +2.2 −3.9 (stat)+1.5 −2.1 (syst) MeV/c 2.
|Titolo:||Measurement of the χ b (3P) mass and of the relative rate of χ b1(1P) and χ b2(1P) production|
|Parole Chiave:||quarkonium; hadron-hadron scattering; flavor physics|
|Settore Scientifico Disciplinare:||Settore FIS/04 - Fisica Nucleare e Subnucleare|
|Data di pubblicazione:||ott-2014|
|Digital Object Identifier (DOI):||10.1007/JHEP10(2014)088|
|Appare nelle tipologie:||01 - Articolo su periodico|