The observation of forward proton scattering in association with lepton pairs (e+e-+p or μ+μ-+p) produced via photon fusion is presented. The scattered proton is detected by the ATLAS Forward Proton spectrometer, while the leptons are reconstructed by the central ATLAS detector. Proton-proton collision data recorded in 2017 at a center-of-mass energy of s=13 TeV are analyzed, corresponding to an integrated luminosity of 14.6 fb-1. A total of 57 (123) candidates in the ee+p (μμ+p) final state are selected, allowing the background-only hypothesis to be rejected with a significance exceeding 5 standard deviations in each channel. Proton-tagging techniques are introduced for cross-section measurements in the fiducial detector acceptance, corresponding to σee+p=11.0±2.6(stat)±1.2(syst)±0.3(lumi) and σμμ+p=7.2±1.6(stat)±0.9(syst)±0.2(lumi) fb in the dielectron and dimuon channel, respectively.
Observation and Measurement of Forward Proton Scattering in Association with Lepton Pairs Produced via the Photon Fusion Mechanism at ATLAS / Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; DELLA PIETRA, Massimo; Merola, Leonardo; Conventi, Francesco; Rossi, Elvira; Massarotti, Paolo; DE ASMUNDIS, Riccardo; Cirotto, Francesco; Lavorgna, Marco; Giannini, Antonio; DI DONATO, Camilla; Iengo, Paolo; Sekhniaidze, Givi; Izzo, Vincenzo; Carlino, Gianpaolo; Doria, Alessandra. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 125:26(2020), p. 261801. [10.1103/PhysRevLett.125.261801]
Observation and Measurement of Forward Proton Scattering in Association with Lepton Pairs Produced via the Photon Fusion Mechanism at ATLAS
ALOISIO ALBERTO;ALVIGGI MARIAGRAZIA;CANALE VINCENZO;DELLA PIETRA MASSIMO;MEROLA LEONARDO;CONVENTI FRANCESCO;ROSSI ELVIRA;MASSAROTTI PAOLO;DE ASMUNDIS Riccardo;CIROTTO FRANCESCO;LAVORGNA MARCO;GIANNINI ANTONIO;
2020
Abstract
The observation of forward proton scattering in association with lepton pairs (e+e-+p or μ+μ-+p) produced via photon fusion is presented. The scattered proton is detected by the ATLAS Forward Proton spectrometer, while the leptons are reconstructed by the central ATLAS detector. Proton-proton collision data recorded in 2017 at a center-of-mass energy of s=13 TeV are analyzed, corresponding to an integrated luminosity of 14.6 fb-1. A total of 57 (123) candidates in the ee+p (μμ+p) final state are selected, allowing the background-only hypothesis to be rejected with a significance exceeding 5 standard deviations in each channel. Proton-tagging techniques are introduced for cross-section measurements in the fiducial detector acceptance, corresponding to σee+p=11.0±2.6(stat)±1.2(syst)±0.3(lumi) and σμμ+p=7.2±1.6(stat)±0.9(syst)±0.2(lumi) fb in the dielectron and dimuon channel, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
