Measurement of inelastic, single- and double-diffraction cross sections in proton--proton collisions at the LHC with ALICEстатья
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Дата последнего поиска статьи во внешних источниках: 2 декабря 2016 г.
Аннотация:Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distributions: for single diffraction (diffractive mass MX<200 GeV/c2) σSD/σINEL=0.21±0.03,0.20+0.07−0.08, and 0.20+0.04−0.07, respectively at centre-of-mass energies s√=0.9,2.76, and 7 TeV/ for double diffraction (for a pseudorapidity gap Δη>3) σDD/σINEL=0.11±0.03,0.12±0.05, and 0.12+0.05−0.04, respectively at s√=0.9,2.76, and 7 TeV. To measure the inelastic cross section, beam properties were determined with van der Meer scans, and, using a simulation of diffraction adjusted to data, the following values were obtained: σINEL=62.8+2.4−4.0(model)±1.2(lumi) mb at s√= 2.76 TeV and 73.2+2.0−4.6(model)±2.6(lumi) mb at s√ = 7 TeV. The single- and double-diffractive cross sections were calculated combining relative rates of diffraction with inelastic cross sections. The results are compared to previous measurements at proton--antiproton and proton--proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models.