Complementary bound on the W′ mass from Higgs boson to diphoton decays

Triparno Bandyopadhyay,Roman Pasechnik,Dipankar Das,Johan Rathsman

doi:10.1103/physrevd.99.115021

Abstract

Using the left-right symmetric model as an illustrative example, we suggest a simple and straightforward way of constraining the $W'$ mass directly from the decay of the Higgs boson to two photons. The proposed method is generic and applicable to a diverse range of models with a $W'$-boson that couples to the SM-like Higgs boson. Our analysis exemplifies how the precision measurement of the Higgs to diphoton signal strength can have a pivotal role in probing the scale of new physics.

Highlights

Models that extend the standard electroweak (EW) gauge symmetry, GEW ∼ SUð2ÞL × Uð1ÞY, to a larger group, G0, often end up introducing new, electrically charged gauge bosons
Using the left-right symmetric model as an illustrative example, we suggest a simple and straightforward way of constraining the W0 mass directly from the decay of the Higgs boson to two photons
Our analysis exemplifies how the precision measurement of the Higgs to diphoton signal strength can have a pivotal role in probing the scale of new physics

Summary

Published by the American Physical Society

We can see that, irrespective of the value of gR, we can rule out vR up to 450 GeV (implying MW0 ≳ 170 GeV for gL 1⁄4 gR) at 95% C.L. using the current LHC data [28] This limit is weak compared to the existing bounds on MW0, it is evident from the left panel of Fig. 1 that, due to the almost horizontal tail of the red curve, once κγ is found to be consistent with the SM with accuracy of a few percent at future colliders, a slight improvement in the precision can substantially strengthen the bound on vR. It is encouraging to note that the bound can rise up to vR > 2.5 TeV (corresponding to MW0 > 850 GeV) if the measurement of the diphoton signal strength is found to be consistent with the SM with a projected accuracy of 1% at the HL-LHC and ILC. Our current analysis underscores the importance of the precision measurement of the Higgs to diphoton signal strength in current as well as future collider experiments, which can give us potential hints for the scale of NP

The Yukawa Lagrangian for the quark sector is given by

Findings

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