Measurement of exclusive γγ→ℓ+ production in proton–proton collisions at √s=7 TeV with the ATLAS detector

ATLAS Collaboration

研究成果: Article査読

53 被引用数 (Scopus)

抄録

This Letter reports a measurement of the exclusive γγ→ℓ+ (ℓ=e, μ) cross-section in proton–proton collisions at a centre-of-mass energy of 7 TeV by the ATLAS experiment at the LHC, based on an integrated luminosity of 4.6 fb−1. For the electron or muon pairs satisfying exclusive selection criteria, a fit to the dilepton acoplanarity distribution is used to extract the fiducial cross-sections. The cross-section in the electron channel is determined to be σγγ→e+e excl.=0.428 ± 0.035 (stat.) ± 0.018 (syst.) pb for a phase–space region with invariant mass of the electron pairs greater than 24 GeV, in which both electrons have transverse momentum pT>12 GeV and pseudorapidity |η|<2.4. For muon pairs with invariant mass greater than 20 GeV, muon transverse momentum pT>10 GeV and pseudorapidity |η|<2.4, the cross-section is determined to be σγγ→μ+μ excl.=0.628 ± 0.032 (stat.) ± 0.021 (syst.) pb. When proton absorptive effects due to the finite size of the proton are taken into account in the theory calculation, the measured cross-sections are found to be consistent with the theory prediction.

本文言語English
ページ(範囲)242-261
ページ数20
ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
749
DOI
出版ステータスPublished - 2015 10月 7

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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