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Title: Physics implications of the diphoton excess from the perspective of renormalization group flow

Abstract

A very plausible explanation for the recently observed diphoton excess at the 13 TeV LHC is a (pseudo)scalar with mass around 750 GeV, which couples to a gluon pair and to a photon pair through loops involving vector-like quarks (VLQs). To accommodate the observed rate, the required Yukawa couplings tend to be large. A large Yukawa coupling would rapidly run up with the scale and quickly reach the perturbativity bound, indicating that new physics, possibly with a strong dynamics origin, is near by. The case becomes stronger especially if the ATLAS observation of a large width persists. In this paper we study the implication on the scale of new physics from the 750 GeV diphoton excess using the method of renormalization group running with careful treatment of different contributions and perturbativity criterion. Our results suggest that the scale of new physics is generically not much larger than the TeV scale, in particular if the width of the hinted (pseudo)scalar is large. Introducing multiple copies of VLQs, lowing the VLQ masses and enlarging VLQ electric charges help reduce the required Yukawa couplings and can push the cutoff scale to higher values. Nevertheless, if the width of the 750 GeV resonance turnsmore » out to be larger than about 1 GeV, it is very hard to increase the cutoff scale beyond a few TeVs. This is a strong hint that new particles in addition to the 750 GeV resonance and the vector-like quarks should be around the TeV scale.« less

Authors:
 [1]; ORCiD logo [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1253186
Report Number(s):
FERMILAB-PUB-15-573-T; arXiv:1512.07624
Journal ID: ISSN 2470-0010; PRVDAQ; 1411233
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 7; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Gu, Jiayin, and Liu, Zhen. Physics implications of the diphoton excess from the perspective of renormalization group flow. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.075006.
Gu, Jiayin, & Liu, Zhen. Physics implications of the diphoton excess from the perspective of renormalization group flow. United States. https://doi.org/10.1103/PhysRevD.93.075006
Gu, Jiayin, and Liu, Zhen. Wed . "Physics implications of the diphoton excess from the perspective of renormalization group flow". United States. https://doi.org/10.1103/PhysRevD.93.075006. https://www.osti.gov/servlets/purl/1253186.
@article{osti_1253186,
title = {Physics implications of the diphoton excess from the perspective of renormalization group flow},
author = {Gu, Jiayin and Liu, Zhen},
abstractNote = {A very plausible explanation for the recently observed diphoton excess at the 13 TeV LHC is a (pseudo)scalar with mass around 750 GeV, which couples to a gluon pair and to a photon pair through loops involving vector-like quarks (VLQs). To accommodate the observed rate, the required Yukawa couplings tend to be large. A large Yukawa coupling would rapidly run up with the scale and quickly reach the perturbativity bound, indicating that new physics, possibly with a strong dynamics origin, is near by. The case becomes stronger especially if the ATLAS observation of a large width persists. In this paper we study the implication on the scale of new physics from the 750 GeV diphoton excess using the method of renormalization group running with careful treatment of different contributions and perturbativity criterion. Our results suggest that the scale of new physics is generically not much larger than the TeV scale, in particular if the width of the hinted (pseudo)scalar is large. Introducing multiple copies of VLQs, lowing the VLQ masses and enlarging VLQ electric charges help reduce the required Yukawa couplings and can push the cutoff scale to higher values. Nevertheless, if the width of the 750 GeV resonance turns out to be larger than about 1 GeV, it is very hard to increase the cutoff scale beyond a few TeVs. This is a strong hint that new particles in addition to the 750 GeV resonance and the vector-like quarks should be around the TeV scale.},
doi = {10.1103/PhysRevD.93.075006},
journal = {Physical Review D},
number = 7,
volume = 93,
place = {United States},
year = {Wed Apr 06 00:00:00 EDT 2016},
month = {Wed Apr 06 00:00:00 EDT 2016}
}

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