Article (Scientific journals)
Diboson anomaly: Heavy Higgs resonance and QCD vector-like exotics
Aristizabal Sierra, Diego; Vicente, Avelino; Herrero-Garcia, Juan et al.
2016In Physical Review. D, Particles and Fields, 93, p. 015012
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Keywords :
LHC Physics; Beyond-the-Standard-model; Collider phenomenology
Abstract :
[en] The ATLAS collaboration (and also CMS) has recently reported an excess over Standard Model expectations for gauge boson pair production in the invariant mass region 1.8−2.2 TeV. In the light of these results, we argue that such signal might be the first manifestation of the production and further decay of a heavy CP-even Higgs resulting from a type-I Two Higgs Doublet Model. We demonstrate that in the presence of colored vector-like fermions, its gluon fusion production cross section is strongly enhanced, with the enhancement depending on the color representation of the new fermion states. Our findings show that barring the color triplet case, any QCD "exotic" representation can fit the ATLAS result in fairly large portions of the parameter space. We have found that if the diboson excess is confirmed and this mechanism is indeed responsible for it, then the LHC Run-2 should find: (i) a CP-odd scalar with mass below ∼2.3 TeV, (ii) new colored states with masses below ∼2 TeV, (iii) no statistically significant diboson events in the W±Z channel, (iv) events in the triboson channels W±W∓Z and ZZZ with invariant mass amounting to the mass of the CP-odd scalar.
Disciplines :
Physics
Author, co-author :
Aristizabal Sierra, Diego ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Inter. fondamentales en physique et astrophysique (IFPA)
Vicente, Avelino;  Instituto de Fisica Cospuscular, CSIC
Herrero-Garcia, Juan;  Royal Institute of Technology
Restrepo, Diego;  Universidad de Antioquia > Fisica
Language :
English
Title :
Diboson anomaly: Heavy Higgs resonance and QCD vector-like exotics
Publication date :
2016
Journal title :
Physical Review. D, Particles and Fields
ISSN :
0556-2821
eISSN :
1089-4918
Publisher :
American Physical Society, College Park, United States - Maryland
Volume :
93
Pages :
015012
Peer reviewed :
Peer reviewed
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since 18 January 2016

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