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

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Measurement of exclusive γγ→ℓ + ℓ − production in proton-proton collisions at √s=7 TeV with the ATLAS detector. Physics letters. B, 749, pp. 242-261. Elsevier 10.1016/j.physletb.2015.07.069

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This Letter reports a measurement of the exclusive γγ→ℓ + 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 σ excl. γγ→e + e − =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 p T >12 GeV and pseudorapidity |η|<2.4 . For muon pairs with invariant mass greater than 20 GeV, muon transverse momentum p T >10 GeV and pseudorapidity |η|<2.4 , the cross-section is determined to be σ excl. γγ→μ + μ − =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:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

0370-2693

Publisher:

Elsevier

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

08 Sep 2016 12:12

Last Modified:

12 Feb 2017 02:08

Publisher DOI:

10.1016/j.physletb.2015.07.069

ArXiv ID:

1506.07098

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt

BORIS DOI:

10.7892/boris.87609

URI:

https://boris.unibe.ch/id/eprint/87609

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