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Search for resonances in the mass spectrum of muon pairs produced in association with b quark jets in proton-proton collisions at ?s=8 and 13 TeV

Abstract: A search for resonances in the mass range 12?70 GeV produced in association with a b quark jet and a second jet, and decaying to a muon pair, is reported. The analysis is based on data from proton-proton collisions at center-of-mass energies of 8 and 13 TeV, collected with the CMS detector at the LHC and corresponding to integrated luminosities of 19.7 and 35.9 fb ?1 , respectively. The search is carried out in two mutually exclusive event categories. Events in the first category are required to have a b quark jet in the central region (|?| ? 2.4) and at least one jet in the forward region (|?| > 2.4). Events in the second category are required to have two jets in the central region, at least one of which is identified as a b quark jet, no jets in the forward region, and low missing transverse momentum. An excess of events above the background near a dimuon mass of 28 GeV is observed in the 8 TeV data, corresponding to local significances of 4.2 and 2.9 standard deviations for the first and second event categories, respectively. A similar analysis conducted with the 13 TeV data results in a mild excess over the background in the first event category corresponding to a local significance of 2.0 standard deviations, while the second category results in a 1.4 standard deviation deficit. The fiducial cross section measurements and 95% confidence level upper limits on those for a resonance consistent with the 8 TeV excess are provided at both collision energies.

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 Fuente: Journal of High Energy Physics, Vol. 2018, Num. 11, Art. Num. 161

Editorial: Springer Verlag

 Fecha de publicación: 26/11/2018

Nº de páginas: 37

Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP11(2018)161

ISSN: 1126-6708,1029-8479

Url de la publicación: https://doi.org/10.1007/JHEP11(2018)161