Abstract
The inclusive Ds± production asymmetry is measured in pp collisions collected by the LHCb experiment at centre-of-mass energies of sqrt{s}=7 and 8 TeV. Promptly produced Ds± mesons are used, which decay as Ds± → ϕπ±, with ϕ → K+K−. The measurement is performed in bins of transverse momentum, pT, and rapidity, y, covering the range 2.5 < pT< 25.0 GeV/c and 2.0 < y < 4.5. No kinematic dependence is observed. Evidence of nonzero Ds± production asymmetry is found with a significance of 3.3 standard deviations.
Highlights
Detector and simulationThe LHCb detector [9, 10] is a single-arm forward spectrometer covering the pseudorapidity range 2 < η < 5, designed for the study of particles containing b or c quarks
Where σ(Ds±) is the inclusive prompt production cross-section
This paper presents a measurement of the Ds+ production asymmetry in pp collisions using two data sets corresponding to integrated luminosities of 1.0 fb−1 and 2.0 fb−1, recorded by the LHCb detector at centre-of-mass energies of 7 and 8 TeV in 2011 and 2012, respectively
Summary
The LHCb detector [9, 10] is a single-arm forward spectrometer covering the pseudorapidity range 2 < η < 5, designed for the study of particles containing b or c quarks. The detector includes a high-precision tracking system consisting of a silicon-strip vertex detector surrounding the pp interaction region, a large-area silicon-strip detector located upstream of a dipole magnet with a bending power of about 4 Tm, and three stations of silicon-strip detectors and straw drift tubes placed downstream of the magnet. The tracking system provides a measurement of momentum, p, of charged particles with a relative uncertainty that varies from 0.5% at low momentum to 1.0% at 200 GeV/c. Different types of charged hadrons are distinguished using information from two ring-imaging Cherenkov detectors. Decays of hadronic particles are described by EvtGen [13], in which final-state radiation is generated using Photos [14]. The interaction of the generated particles with the detector, and its response, are implemented using the Geant toolkit [15, 16] as described in ref. The interaction of the generated particles with the detector, and its response, are implemented using the Geant toolkit [15, 16] as described in ref. [17]
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