Evidence for exclusive γγ → W+W– production and constraints on anomalous quartic gauge couplings in pp collisions at $$\sqrt{s} = 7 $$ and 8 TeV
Journal Article
·
· Journal of High Energy Physics (Online)
A search for exclusive or quasi-exclusive γγ → W$$^{+}$$ W$$^{–}$$ production, via pp → p$$^{(*)}$$ W$$^{+}$$ W$$^{–}$$ p$$^{(*)}$$ → p$$^{(*)}$$ μ$$^{±}$$e$$^{∓}$$ p$$^{(*)}$$ at $$ \sqrt{s}=8 $$ TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb$$^{–1}$$. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum p$$_{T}$$(μ$$^{±}$$e$$^{∓}$$) > 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 fb$$^{–1}$$ of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 ± 0.6 (0.84 ± 0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4σ over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive γγ → W$$^{+}$$ W$$^{–}$$ production. Here, upper limits on the anomalous quartic gauge coupling operators a$$_{0,C}^{W}$$ (dimension-6) and f$$_{M0,1,2,3}$$ (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Contributing Organization:
- CMS Collaboration; The CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359; AC52-07NA27344
- OSTI ID:
- 1288745
- Alternate ID(s):
- OSTI ID: 1357369
OSTI ID: 22610473
- Report Number(s):
- CERN-EP-2016-073; CMS-FSQ-13-008; FERMILAB-PUB-16-204-CMS; LLNL-JRNL--704026; arXiv:1604.04464; 1448100
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2016; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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