Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at root s=13 TeV

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The CMS Collaboration , Eerola , P , Kirschenmann , H , Voutilainen , M , Havukainen , J , Heikkila , J K , Jarvinen , T , Kinnunen , R , Lampen , T , Lassila-Perini , K , Laurila , S , Lehti , S , Linden , T , Luukka , P , Maenpaa , T , Siikonen , H , Tuominen , E , Tuominiemi , J , Sirunyan , A M , Karimäki , V , Tuuva , T , Forthomme , L , Österberg , K , Garcia , F & Pekkanen , J 2019 , ' Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at root s=13 TeV ' , Physical Review Letters , vol. 123 , no. 23 , 231803 . https://doi.org/10.1103/PhysRevLett.123.231803

Title: Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at root s=13 TeV
Author: The CMS collaboration; Eerola, P.; Kirschenmann, H.; Voutilainen, M.; Havukainen, J.; Heikkila, J. K.; Jarvinen, T.; Kinnunen, R.; Lampen, T.; Lassila-Perini, K.; Laurila, S.; Lehti, S.; Linden, T.; Luukka, P.; Maenpaa, T.; Siikonen, H.; Tuominen, E.; Tuominiemi, J.; Sirunyan, A. M.; Karimäki, V.; Tuuva, T.; Forthomme, L.; Österberg, K.; Garcia, F.; Pekkanen, J.
Contributor organization: Department of Physics
Helsinki Institute of Physics
Eija Tuominen / Principal Investigator
Date: 2019-12-03
Language: eng
Number of pages: 17
Belongs to series: Physical Review Letters
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.123.231803
URI: http://hdl.handle.net/10138/311075
Abstract: A search for narrow low-mass resonances decaying to quark-antiquark pairs is presented. The search is based on proton-proton collision events collected at 13 TeV by the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of 35.9 fb(-1), recorded in 2016. The search considers the case where the resonance has high transverse momentum due to initial-state radiation of a hard photon. To study this process, the decay products of the resonance are reconstructed as a single large-radius jet with two-pronged substructure. The signal would be identified as a localized excess in the jet invariant mass spectrum. No evidence for such a resonance is observed in the mass range 10 to 125 GeV. Upper limits at the 95% confidence level are set on the coupling strength of resonances decaying to quark pairs. The results obtained with this photon trigger strategy provide the first direct constraints on quark-antiquark resonance masses below 50 GeV obtained at a hadron collider.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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