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Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at √s = 13 TeV
Sirunyan, A. M. Murray, Michael Joseph CMS Collaboration
Sirunyan, A. M.
Murray, Michael Joseph
CMS Collaboration
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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.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
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2019-12-03
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American Physical Society
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A. M. Sirunyan et al., "Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at √s = 13 TeV", Phys. Rev. Lett. 123, 231803, 3 December 2019, American Physical Society, https://doi.org/10.1103/PhysRevLett.123.231803