Measurement of exclusive γγ→ℓ+ℓ−γγ→ℓ+ℓ− production in proton–proton collisions at View the MathML sources=7 TeV with the ATLAS detector

Allbrooke, Benedict, Asquith, Lily, Cerri, Alessandro, Chavez Barajas, Carlos, De Santo, Antonella, Potter, Tina, Salvatore, Fabrizio, Santoyo Castillo, Itzebelt, Suruliz, Kerim, Sutton, Mark, Vivarelli, Iacopo and The ATLAS Collaboration, et al (2015) Measurement of exclusive γγ→ℓ+ℓ−γγ→ℓ+ℓ− production in proton–proton collisions at View the MathML sources=7 TeV with the ATLAS detector. Physics Letters B, 749. pp. 242-261. ISSN 0370-2693

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Abstract

This Letter reports a measurement of the exclusive γγ→ℓ+ℓ−γγ→ℓ+ℓ− (ℓ=e, μℓ=e, μ) cross-section in proton–proton collisions at a centre-of-mass energy of 7 TeV7 TeV by the ATLAS experiment at the LHC, based on an integrated luminosity of 4.6 fb−14.6 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 View the MathML sourceσγγ→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 GeV24 GeV, in which both electrons have transverse momentum pT>12 GeVpT>12 GeV and pseudorapidity |η|<2.4|η|<2.4. For muon pairs with invariant mass greater than 20 GeV20 GeV, muon transverse momentum pT>10 GeVpT>10 GeV and pseudorapidity |η|<2.4|η|<2.4, the cross-section is determined to be View the MathML sourceσγγ→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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Richard Chambers
Date Deposited: 20 Jun 2016 10:59
Last Modified: 13 Mar 2017 10:40
URI: http://sro.sussex.ac.uk/id/eprint/61605

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