Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two τ leptons and two jets in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV
A search for new particles has been conducted using events with two high transverse momentum $$\tau$$ leptons that decay hadronically and at least two energetic jets. The analysis is performed using data from proton-proton collisions at $$\sqrt{s}=$$ 13 TeV, collected by the CMS experiment at the LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb$$^{-1}$$. The observed data are consistent with standard model expectations. The results are interpreted in the context of two physics models. The first model involves right-handed charged bosons, W$$_\mathrm{R}$$, that decay to heavy right-handed Majorana neutrinos, N$$_\ell$$ $$(\ell= $$e, $$\mu,\tau)$$, arising in a left-right symmetric extension of the standard model. The model considers that N$$_\mathrm{e}$$ and N$$_\mu$$ are too heavy to be detected at the LHC. Assuming that the N$$_\tau$$ mass is half of the W$$_\mathrm{R}$$ mass, masses of the W$$_\mathrm{R}$$ boson below 3.50 TeV are excluded at 95% confidence level. Exclusion limits are also presented considering different scenarios for the mass ratio between N$$_\tau$$ and W$$_\mathrm{R}$$, as a function of W$$_\mathrm{R}$$ mass. In the second model, pair production of third-generation scalar leptoquarks that decay into $$\tau\tau$$bb is considered, resulting in an observed exclusion region with leptoquark masses below 1.02 TeV, assuming a 100% branching fraction for the leptoquark decay to a $$\tau$$ lepton and a bottom quark. These results represent the most stringent limits to date on these models.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Texas A & M Univ., College Station, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The CMS collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0010813
- OSTI ID:
- 1484189
- Alternate ID(s):
- OSTI ID: 1595561
- Report Number(s):
- FERMILAB-PUB-18-642-CMS; arXiv:1811.00806; CMS-EXO-17-016; CERN-EP-2018-272; 1701635
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2019, Issue 3; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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