TY - JOUR
T1 - Hard color-singlet exchange in dijet events in proton-proton collisions at root s=13 TeV
AU - The CMS Collaboration
AU - Sirunyan, A. M.
AU - Tumasyan, A.
AU - Eerola, P.
AU - Forthomme, Laurent
AU - Kirschenmann, H.
AU - Saarikko, Heimo
AU - Voutilainen, M.
AU - Österberg, K.
AU - Berretti, Mirko
AU - Brücken, Erik
AU - Garcia, F.
AU - Havukainen, J.
AU - Heikkilä, Jaana
AU - Karimäki, V.
AU - Kim, Minsuk
AU - Kinnunen, R.
AU - Lampén, T.
AU - Lassila-Perini, K.
AU - Laurila, S.
AU - Lehti, S.
AU - Lindén, T.
AU - Luukka, P.
AU - Naaranoja, Tiina
AU - Oljemark, Fredrik Robert
AU - Pekkanen, Juska
AU - Siikonen, H.
AU - Tuominen, E.
AU - Tuominiemi, J.
AU - Welti, Jan Sebastian
AU - Viinikainen, Jussi
AU - Tuuva, T.
PY - 2021/8/26
Y1 - 2021/8/26
N2 - Events where the two leading jets are separated by a pseudorapidity interval devoid of particle activity, known as jet-gap-jet events, are studied in proton-proton collisions at root s = 13 TeV. The signature is expected from hard color-singlet exchange. Each of the highest transverse momentum (p(T)) jets must have p(T)(jet) > 40 GeV and pseudorapidity 1.4 < vertical bar eta(jet)vertical bar < 4.7, with eta(jet1)eta(jet2) < 0, where jet1 and jet2 are the leading and subleading jets in p(T), respectively. The analysis is based on data collected by the CMS and TOTEM experiments during a low luminosity, high-beta* run at the CERN LHC in 2015, with an integrated luminosity of 0.66 pb(-1). Events with a low number of charged particles with p(T) > 0.2 GeV in the interval vertical bar eta vertical bar < 1 between the jets are observed in excess of calculations that assume only color-exchange. The fraction of events produced via color-singlet exchange, f(CSE), is measured as a function of p(T)(jet2), the pseudorapidity difference between the two leading jets, and the azimuthal angular separation between the two leading jets. The fraction f(CSE) has values of 0.4-1.0%. The results are compared with previous measurements and with predictions from perturbative quantum chromodynamics. In addition, the first study of jet-gap-jet events detected in association with an intact proton using a subsample of events with an integrated luminosity of 0.40 pb(-1) is presented. The intact protons are detected with the Roman pot detectors of the TOTEM experiment. The f(CSE) in this sample is 2.91 +/- 0.70(stat)(-1.01)(+1.08)(syst) times larger than that for inclusive dijet production in dijets with similar kinematics.
AB - Events where the two leading jets are separated by a pseudorapidity interval devoid of particle activity, known as jet-gap-jet events, are studied in proton-proton collisions at root s = 13 TeV. The signature is expected from hard color-singlet exchange. Each of the highest transverse momentum (p(T)) jets must have p(T)(jet) > 40 GeV and pseudorapidity 1.4 < vertical bar eta(jet)vertical bar < 4.7, with eta(jet1)eta(jet2) < 0, where jet1 and jet2 are the leading and subleading jets in p(T), respectively. The analysis is based on data collected by the CMS and TOTEM experiments during a low luminosity, high-beta* run at the CERN LHC in 2015, with an integrated luminosity of 0.66 pb(-1). Events with a low number of charged particles with p(T) > 0.2 GeV in the interval vertical bar eta vertical bar < 1 between the jets are observed in excess of calculations that assume only color-exchange. The fraction of events produced via color-singlet exchange, f(CSE), is measured as a function of p(T)(jet2), the pseudorapidity difference between the two leading jets, and the azimuthal angular separation between the two leading jets. The fraction f(CSE) has values of 0.4-1.0%. The results are compared with previous measurements and with predictions from perturbative quantum chromodynamics. In addition, the first study of jet-gap-jet events detected in association with an intact proton using a subsample of events with an integrated luminosity of 0.40 pb(-1) is presented. The intact protons are detected with the Roman pot detectors of the TOTEM experiment. The f(CSE) in this sample is 2.91 +/- 0.70(stat)(-1.01)(+1.08)(syst) times larger than that for inclusive dijet production in dijets with similar kinematics.
KW - 114 Physical sciences
KW - RAPIDITY GAPS
KW - MULTIPLICITY DISTRIBUTIONS
KW - (P)OVER-BAR-P COLLISIONS
KW - P(P)OVER-BAR COLLISIONS
KW - POMERANCHUK SINGULARITY
KW - ENERGY
KW - JETS
KW - PHOTOPRODUCTION
KW - FRAGMENTATION
KW - SCATTERING
U2 - 10.1103/PhysRevD.104.032009
DO - 10.1103/PhysRevD.104.032009
M3 - Article
VL - 104
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 3
M1 - 032009
ER -