Observation and Measurement of Forward Proton Scattering in Association with Lepton Pairs Produced via the Photon Fusion Mechanism at ATLAS
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2020-12-23Referencia bibliográfica
Aad, G., Abbott, B., Abbott, D. C., Abud, A. A., Abeling, K., Abhayasinghe, D. K., ... & Balli, F. (2020). Observation and measurement of forward proton scattering in association with lepton pairs produced via the photon fusion mechanism at ATLAS. Physical review letters, 125(26), 261801. [DOI: 10.1103/PhysRevLett.125.261801]
Patrocinador
ANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW, Austria; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; National Council for Scientific and Technological Development (CNPq); Natural Sciences and Engineering Research Council of Canada (NSERC); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); NRC, Canada; Canada Foundation for Innovation; CERN; ANID, Chile; Chinese Academy of Sciences; Ministry of Science and Technology, China; National Natural Science Foundation of China (NSFC); Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic Czech Republic Government; Czech Republic Government; DNRF, Denmark; Danish Natural Science Research Council; Centre National de la Recherche Scientifique (CNRS); CEA-DRF/IRFU, France; SRNSFG, Georgia; Federal Ministry of Education & Research (BMBF); HGF, Germany; Max Planck Society; Greek Ministry of Development-GSRT; RGC, China; Hong Kong SAR, China; Israel Science Foundation; Benoziyo Center, Israel; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; Netherlands Organization for Scientific Research (NWO) Netherlands Government; RCN, Norway; Ministry of Science and Higher Education, Poland; Ministry of Science and Higher Education, Poland; Portuguese Foundation for Science and Technology; MNE/IFA, Romania; MES of Russia, Russia Federation; NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; DST/NRF, South Africa; Spanish Government; SRC, Sweden; Wallenberg Foundation, Sweden; SERI, Switzerland; Swiss National Science Foundation (SNSF); Canton of Bern, Switzerland; Canton of Geneva, Switzerland; Ministry of Science and Technology, Taiwan; Ministry of Energy & Natural Resources - Turkey; UK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC); United States Department of Energy (DOE); National Science Foundation (NSF); BCKDF, Canada; CANARIE, Canada; Compute Canada, Canada; CRC, Canada; IVADO, Canada; Beijing Municipal Science & Technology Commission; COST, European Union; European Union (EU) European Research Council (ERC); European Union (EU); European Union (EU); European Union (EU); German Research Foundation (DFG); Alexander von Humboldt Foundation; Herakleitos program - EU-ESF, Greece; Thales program - EU-ESF, Greece; Aristeia program - EU-ESF, Greece; Greek NSRF, Greece; BSFNSF, Israel; German-Israeli Foundation for Scientific Research and Development; La Caixa Banking Foundation, Spain; CERCA Programme Generalitat de Catalunya, Spain; Generalitat Valenciana; GenT Program Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; Leverhulme Trust; French National Research Agency (ANR)Resumen
The observation of forward proton scattering in association with lepton pairs (eþe− þ p or μþμ− þ 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 ffiffiffi s
p
¼ 13 TeV are analyzed, corresponding to an
integrated luminosity of 14.6 fb−1. A total of 57 (123) candidates in the ee þ p (μμ þ 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 σeeþp ¼ 11.0 2.6ðstatÞ 1.2ðsystÞ 0.3ðlumiÞ and
σμμþp ¼ 7.2 1.6ðstatÞ 0.9ðsystÞ 0.2ðlumiÞ fb in the dielectron and dimuon channel, respectively