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

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Abstract

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 root s = 13 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 mu(+)/mu(-) 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 gamma gamma collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications.
Original languageEnglish
Article number153
JournalJournal of High Energy Physics
Volume2018
Issue number7
Number of pages45
ISSN1029-8479
DOIs
Publication statusPublished - 24 Jul 2018
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 114 Physical sciences
  • Forward physics
  • Hadron-Hadron scattering (experiments)
  • Photon production
  • proton-proton scattering
  • LHC
  • DETECTORS

Cite this

@article{36ee3303c3144aaaa3da9a3aa2463683,
title = "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",
abstract = "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 root s = 13 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 mu(+)/mu(-) 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 gamma gamma collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications.",
keywords = "114 Physical sciences, Forward physics, Hadron-Hadron scattering (experiments), Photon production, proton-proton scattering, LHC, DETECTORS",
author = "{The CMS Collaboration} and {TOTEM Collaboration} and Sirunyan, {A. M.} and P. Eerola and H. Kirschenmann and J. Pekkanen and M. Voutilainen and J. Havukainen and Heikkil{\"a}, {J. K.} and T. J{\"a}rvinen and V. Karim{\"a}ki and R. Kinnunen and T. Lamp{\'e}n and K. Lassila-Perini and S. Laurila and S. Lehti and T. Lind{\'e}n and P. Luukka and T. M{\"a}enp{\"a}{\"a} and H. Siikonen and E. Tuominen and J. Tuominiemi and T. Tuuva and M. Berretti and F. Garcia and J. Heino and R. Lauhakangas and T. Naaranoja and F. Oljemark and K. {\"O}sterberg and H. Saarikko and J. Welti",
year = "2018",
month = "7",
day = "24",
doi = "10.1007/JHEP07(2018)153",
language = "English",
volume = "2018",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer",
number = "7",

}

TY - JOUR

T1 - 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

AU - The CMS Collaboration

AU - TOTEM Collaboration

AU - Sirunyan, A. M.

AU - Eerola, P.

AU - Kirschenmann, H.

AU - Pekkanen, J.

AU - Voutilainen, M.

AU - Havukainen, J.

AU - Heikkilä, J. K.

AU - Järvinen, T.

AU - Karimäki, V.

AU - Kinnunen, R.

AU - Lampén, T.

AU - Lassila-Perini, K.

AU - Laurila, S.

AU - Lehti, S.

AU - Lindén, T.

AU - Luukka, P.

AU - Mäenpää, T.

AU - Siikonen, H.

AU - Tuominen, E.

AU - Tuominiemi, J.

AU - Tuuva, T.

AU - Berretti, M.

AU - Garcia, F.

AU - Heino, J.

AU - Lauhakangas, R.

AU - Naaranoja, T.

AU - Oljemark, F.

AU - Österberg, K.

AU - Saarikko, H.

AU - Welti, J.

PY - 2018/7/24

Y1 - 2018/7/24

N2 - 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 root s = 13 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 mu(+)/mu(-) 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 gamma gamma collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications.

AB - 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 root s = 13 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 mu(+)/mu(-) 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 gamma gamma collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications.

KW - 114 Physical sciences

KW - Forward physics

KW - Hadron-Hadron scattering (experiments)

KW - Photon production

KW - proton-proton scattering

KW - LHC

KW - DETECTORS

U2 - 10.1007/JHEP07(2018)153

DO - 10.1007/JHEP07(2018)153

M3 - Article

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 7

M1 - 153

ER -