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
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer Nature
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/69745/ http://irep.iium.edu.my/69745/ http://irep.iium.edu.my/69745/ http://irep.iium.edu.my/69745/1/69745_Search%20for%20resonances%20in%20the%20mass%20spectrum_article.pdf http://irep.iium.edu.my/69745/2/69745_Search%20for%20resonances%20in%20the%20mass%20spectrum_scopus.pdf http://irep.iium.edu.my/69745/13/69745%20earch%20for%20resonances%20in%20the%20mass%20spectrum%20of%20muon%20pairs%20WOS.pdf |
| Summary: | 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 (
�
�η
�
� ≤ 2.4) and at least one jet in the forward region (
�
�η
�
� > 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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