Title: Theta in new QCD-like sectors

Abstract

New QCD-like “hypercolor” sectors can generate a broad class of new signatures at hadron colliders and furnish a variety of dark matter candidates. Paired diboson resonances are a particularly important collider signature, arising both from C P -conserving vector hypermeson decays of the form $$\overset{˜}{ρ}$$ → $$\overset{˜}{π}$$$\overset{˜}{π}$$ → 4 V and from C P-violating pseudoscalar hypermeson decays of the form $$\overset{˜}{η}$$ → $$\overset{˜}{π}$$$\overset{˜}{π}$$ → 4 V . The latter are sensitive to the vacuum angle ˜ θ in the hypercolor sector. We study single- and paired-diboson resonance signatures in final states involving gluons and photons at the LHC and a future 100 TeV p p collider, illustrating the discovery potential at both colliders in simple benchmark models. We also describe some of the theoretical and cosmological consequences of $$\overset{˜}{Φ}$$ . If C P-violating hypermeson decays are observable at hadron colliders, ordinary QCD must have an axion. Such scenarios also provide a natural setting for a dark pion component of dark matter, with its relic abundance set by C P-violating annihilations. If the new vacuum angle is relaxed to zero by a dark axion, the relic density can instead be a mixture of axions and dark axions. Overproduction of dark axions is most easily avoided if the Universe underwent a period of early matter domination.

Authors:

Draper, Patrick; Kozaczuk, Jonathan; Yu, Jiang-Hao

Publication Date:

2018-07-20

Research Org.:

Univ. of Massachusetts, Amherst, MA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1461026

Alternate Identifier(s):

OSTI ID: 1498824

Grant/Contract Number:  

[de-sc0011095; sc0011095]

Resource Type:

Published Article

Journal Name:

Physical Review D

Additional Journal Information:

[Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 1]; Journal ID: ISSN 2470-0010

Publisher:

American Physical Society

Country of Publication:

United States

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS