Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer

被引：0

作者：

A. M. Sirunyan

A. Tumasyan

W. Adam

F. Ambrogi

E. Asilar

T. Bergauer

J. Brandstetter

E. Brondolin

M. Dragicevic

J. Erö

A. Escalante Del Valle

M. Flechl

M. Friedl

R. Frühwirth

V. M. Ghete

J. Grossmann

J. Hrubec

M. Jeitler

A. König

N. Krammer

I. Krätschmer

D. Liko

T. Madlener

I. Mikulec

E. Pree

N. Rad

H. Rohringer

J. Schieck

R. Schöfbeck

M. Spanring

D. Spitzbart

A. Taurok

W. Waltenberger

J. Wittmann

C.-E. Wulz

M. Zarucki

V. Chekhovsky

V. Mossolov

J. Suarez Gonzalez

E. A. De Wolf

D. Di Croce

X. Janssen

J. Lauwers

M. Pieters

M. Van De Klundert

H. Van Haevermaet

P. Van Mechelen

N. Van Remortel

S. Abu Zeid

F. Blekman

机构：

[1] Yerevan Physics Institute,Institute for Nuclear Research and Nuclear Energy

[2] Institut für Hochenergiephysik,State Key Laboratory of Nuclear Physics and Technology

[3] Institute for Nuclear Problems,Department of Physics

[4] Universiteit Antwerpen,MTA

[5] Vrije Universiteit Brussel,ELTE Lendület CMS Particle and Nuclear Physics Group

[6] Université Libre de Bruxelles,Institute of Physics

[7] Ghent University,National Centre for Particle Physics

[8] Université Catholique de Louvain,National Centre for Physics

[9] Centro Brasileiro de Pesquisas Fisicas,Institute of Experimental Physics, Faculty of Physics

[10] Universidade do Estado do Rio de Janeiro,Skobeltsyn Institute of Nuclear Physics

[11] Universidade Estadual Paulista,Department of Physics

[12] Universidade Federal do ABC,Plasma Physics Research Center, Science and Research Branch

[13] Bulgarian Academy of Sciences,Malaysian Nuclear Agency

[14] University of Sofia,Faculty of Physics

[15] Beihang University,School of Physics and Astronomy

[16] Institute of High Energy Physics,Helsinki Institute of Physics

[17] Peking University,Department of Physics

[18] Tsinghua University,Wigner Research Centre for Physics

[19] Universidad de Los Andes,INRNE

[20] University of Split,BAS, Institute for Nuclear Research and Nuclear Energy

[21] Faculty of Electrical Engineering,Department of Atomic Physics

[22] Mechanical Engineering and Naval Architecture,Institute of Nuclear Physics

[23] University of Split,undefined

[24] Faculty of Science,undefined

[25] Institute Rudjer Boskovic,undefined

[26] University of Cyprus,undefined

[27] Charles University,undefined

[28] Universidad San Francisco de Quito,undefined

[29] Academy of Scientific Research and Technology of the Arab Republic of Egypt,undefined

[30] Egyptian Network of High Energy Physics,undefined

[31] National Institute of Chemical Physics and Biophysics,undefined

[32] University of Helsinki,undefined

[33] Helsinki Institute of Physics,undefined

[34] Lappeenranta University of Technology,undefined

[35] IRFU,undefined

[36] CEA,undefined

[37] Université Paris-Saclay,undefined

[38] Laboratoire Leprince-Ringuet,undefined

[39] Ecole polytechnique,undefined

[40] CNRS/IN2P3,undefined

[41] Université Paris-Saclay,undefined

[42] Université de Strasbourg,undefined

[43] CNRS,undefined

[44] IPHC UMR 7178,undefined

[45] Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules,undefined

[46] CNRS/IN2P3,undefined

[47] Université de Lyon,undefined

[48] Université Claude Bernard Lyon 1,undefined

[49] CNRS-IN2P3,undefined

[50] Institut de Physique Nucléaire de Lyon,undefined

来源：

Journal of High Energy Physics | / 2018卷

关键词：

Forward physics; Hadron-Hadron scattering (experiments); Photon production; proton-proton scattering;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The process pp → pℓ+ℓ−p(*), with ℓ+ℓ− a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the first time at the LHC in pp collisions at s=13\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s}=13 $$\end{document} TeV. One of the two scattered protons is measured in the CMS-TOTEM precision proton spectrometer (CT-PPS), which operated for the first time in 2016. The second proton either remains intact or is excited and then dissociates into a low-mass state p*, which is undetected. The measurement is based on an integrated luminosity of 9.4 fb−1 collected during standard, high-luminosity LHC operation. A total of 12 μ+μ− and 8 e+e− pairs with m(ℓ+ℓ−) > 110 GeV, and matching forward proton kinematics, are observed, with expected backgrounds of 1.49 ± 0.07 (stat) ± 0.53 (syst) and 2.36 ± 0.09 (stat) ± 0.47 (syst), respectively. This corresponds to an excess of more than five standard deviations over the expected background. The present result constitutes the first observation of proton-tagged γγ collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications. [graphic not available: see fulltext]

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