Measurement of the Y(1S) pair production cross section and search for resonances decaying to Y(1S)μ+μ– in proton-proton collisions at
The fiducial cross section for $$\Upsilon$$(1S) pair production in proton-proton collisions at a center-of-mass energy of 13 TeV in the region where both $$\Upsilon$$(1S) mesons have an absolute rapidity below 2.0 is measured to be 79 $$\pm$$ 11 (stat) $$\pm$$ 6 (syst) $$\pm$$ 3 ($$\mathcal{B}$$) pb assuming the mesons are produced unpolarized. The last uncertainty corresponds to the uncertainty in the $$\Upsilon$$(1S) meson dimuon branching fraction. The measurement is performed in the final state with four muons using proton-proton collision data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb$$^{-1}$$. This process serves as a standard model reference in a search for narrow resonances decaying to $$\Upsilon$$(1S)$$\mu^+\mu^-$$ in the same final state. Such a resonance could indicate the existence of a tetraquark that is a bound state of two b quarks and two $$\bar{\mathrm{b}}$$ antiquarks. The tetraquark search is performed for masses in the vicinity of four times the bottom quark mass, between 17.5 and 19.5 GeV, while a generic search for other resonances is performed for masses between 16.5 and 27 GeV. No significant excess of events compatible with a narrow resonance is observed in the data. Limits on the production cross section times branching fraction to four muons via an intermediate $$\Upsilon$$(1S) resonance are set as a function of the resonance mass.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Kavli Foundation; Nvidia Corporation; SuperMicro Corporation; The Welch Foundation; Weston Havens Foundation; USDOE
- Contributing Organization:
- The CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359; C-1845; SC0010005
- OSTI ID:
- 1606568
- Alternate ID(s):
- OSTI ID: 1721483
- Report Number(s):
- FERMILAB-PUB-20-134-CMS; arXiv:2002.06393; CMS-BPH-18-002; CERN-EP-2020-003; oai:inspirehep.net:1780982; TRN: US2104535
- Journal Information:
- Physics Letters. B, Vol. 808, Issue C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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