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Title: From the 750 GeV diphoton resonance to multilepton excesses

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1275978
Grant/Contract Number:
AC02-06CH11357; SC 0010143
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 1; Related Information: CHORUS Timestamp: 2016-07-29 18:09:57; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Bae, Kyu Jung, Chen, Chuan-Ren, Hamaguchi, Koichi, and Low, Ian. From the 750 GeV diphoton resonance to multilepton excesses. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.94.015035.
Bae, Kyu Jung, Chen, Chuan-Ren, Hamaguchi, Koichi, & Low, Ian. From the 750 GeV diphoton resonance to multilepton excesses. United States. doi:10.1103/PhysRevD.94.015035.
Bae, Kyu Jung, Chen, Chuan-Ren, Hamaguchi, Koichi, and Low, Ian. 2016. "From the 750 GeV diphoton resonance to multilepton excesses". United States. doi:10.1103/PhysRevD.94.015035.
@article{osti_1275978,
title = {From the 750 GeV diphoton resonance to multilepton excesses},
author = {Bae, Kyu Jung and Chen, Chuan-Ren and Hamaguchi, Koichi and Low, Ian},
abstractNote = {},
doi = {10.1103/PhysRevD.94.015035},
journal = {Physical Review D},
number = 1,
volume = 94,
place = {United States},
year = 2016,
month = 7
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.94.015035

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • Weakly coupled models for the 750 GeV diphoton resonance often invoke new particles carrying both color and/or electric charges to mediate loop-induced couplings of the resonance to two gluons and two photons. The new colored particles may not be stable and could decay into final states containing standard model particles. We consider an electroweak doublet of vectorlike quarks (VLQs) carrying electric charges of 5/3 and 2/3, respectively, which mediate the loop-induced couplings of the 750 GeV resonance. If the VLQ has a mass at around 1 TeV, it naturally gives rise to the observed diphoton signal strength while all couplingsmore » remain perturbative up to a high scale. At the same time, if the charge-5/3 VLQ decays into final states containing top quark and W boson, it would contribute to the multilepton excesses observed in both run 1 and run 2 data. It is also possible to incorporate a dark matter candidate in the decay final states to explain the observed relic density.« less
  • Searches are presented for heavy scalar (H) and pseudoscalar (A) Higgs bosons posited in the two doublet model (2HDM) extensions of the standard model (SM). These searches are based on a data sample of pp collisions collected with the CMS experiment at the LHC at a center-of-mass energy of √s=8 TeV and corresponding to an integrated luminosity of 19.5 fb -1. The decays H→hh and A→Zh, where h denotes an SM-like Higgs boson, lead to events with three or more isolated charged leptons or with a photon pair accompanied by one or more isolated leptons. Our search results are presentedmore » in terms of the H and A production cross sections times branching fractions and are further interpreted in terms of 2HDM parameters. We place 95% C.L. cross section upper limits of approximately 7 pb on σB for H→hh and 2 pb for A→Zh. Furthermore, the results of a search for the rare decay of the top quark are presented; this results in a charm quark and an SM Higgs boson,t→ch, the existence of which would indicate a nonzero flavor-changing Yukawa coupling of the top quark to the Higgs boson. We place a 95% C.L. upper limit of 0.56% on B(t→ch).« less
    Cited by 15
  • Searches are presented for heavy scalar (H) and pseudoscalar (A) Higgs bosons posited in the two doublet model (2HDM) extensions of the standard model (SM). These searches are based on a data sample of pp collisions collected with the CMS experiment at the LHC at a center-of-mass energy of √s=8 TeV and corresponding to an integrated luminosity of 19.5 fb -1. The decays H→hh and A→Zh, where h denotes an SM-like Higgs boson, lead to events with three or more isolated charged leptons or with a photon pair accompanied by one or more isolated leptons. Our search results are presentedmore » in terms of the H and A production cross sections times branching fractions and are further interpreted in terms of 2HDM parameters. We place 95% C.L. cross section upper limits of approximately 7 pb on σB for H→hh and 2 pb for A→Zh. Furthermore, the results of a search for the rare decay of the top quark are presented; this results in a charm quark and an SM Higgs boson,t→ch, the existence of which would indicate a nonzero flavor-changing Yukawa coupling of the top quark to the Higgs boson. We place a 95% C.L. upper limit of 0.56% on B(t→ch).« less
  • Cited by 2
  • We have developed a new event generator SUSYSM to simulate the production of squarks and gluinos at hadron supercolliders including all the cascade decays as given by the minimal supersymmetric model. The simulation incorporates final-state hadronization and fragmentation effects for the decays of heavy flavors. We have used this to compute the rates for {ital E}{sub {ital T}} events, same-sign dilepton events, {ital n}{sub {ital l}}=3, 4, and 5 isolated-lepton events, and single or double {ital Z}{sup 0}+{ital E}{sub {ital T}} events from squark and gluino production at the CERN Large Hadron Collider (LHC) and the Superconducting Super Collider (SSC)more » for cuts inspired by the Solenoidal Detector Collaboration. We have identified and estimated several backgrounds to the various event topologies and shown that it should be possible to extract signals in several channels both at the LHC and SSC. We have shown that after accumulating one year's worth of design luminosity, it should be possible to identify a gluino with mass up to 2 TeV at the SSC, while the corresponding reach of the LHC is 1.2--1.7 TeV, depending on the luminosity.« less