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Diboson anomaly: Heavy Higgs resonance and QCD vectorlike exotics
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
2016 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 93, no 1, 015012Article in journal (Refereed) PublishedText
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 light of these results, we argue that such a 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 vectorlike 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 similar to 2.3 TeV, (ii) new colored states with masses below similar to 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.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 93, no 1, 015012
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-182152DOI: 10.1103/PhysRevD.93.015012ISI: 000368516100007ScopusID: 2-s2.0-84955506492OAI: diva2:904966

QC 20160220

Available from: 2016-02-20 Created: 2016-02-16 Last updated: 2016-02-20Bibliographically approved

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Herrero-Garcia, Juan
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