Di-Higgs Production in the $4b$ Channel and Gravitational Wave Complementarity. (arXiv:1909.05268v1 [hep-ph])

<a href="http://arxiv.org/find/hep-ph/1/au:+Alves_A/0/1/0/all/0/1">Alexandre Alves</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Goncalves_D/0/1/0/all/0/1">Dorival Gonçalves</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Ghosh_T/0/1/0/all/0/1">Tathagata Ghosh</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Guo_H/0/1/0/all/0/1">Huai-Ke Guo</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Sinha_K/0/1/0/all/0/1">Kuver Sinha</a>

We present a complementarity study of gravitational waves and double Higgs

production in the $4b$ channel, exploring the gauge singlet scalar extension of

the SM. This new physics extension serves as a simplified benchmark model that

realizes a strongly first-order electroweak phase transition necessary to

generate the observed baryon asymmetry in the universe. In calculating the

signal-to-noise ratio of the gravitational waves, we incorporate the effect of

the recently discovered significant suppression of the gravitational wave

signals from sound waves for strong phase transitions, make sure that

supercooled phase transitions do complete and adopt a bubble wall velocity that

is consistent with a successful electroweak baryogenesis by solving the

velocity profiles of the plasma. The high-luminosity LHC sensitivity to the

singlet scalar extension of the SM is estimated using a shape-based analysis of

the invariant $4b$ mass distribution. We find that while the region of

parameter space giving detectable gravitational waves is shrunk due to the new

gravitational wave simulations, the qualitative complementary role of

gravitational waves and collider searches remain unchanged.

We present a complementarity study of gravitational waves and double Higgs

production in the $4b$ channel, exploring the gauge singlet scalar extension of

the SM. This new physics extension serves as a simplified benchmark model that

realizes a strongly first-order electroweak phase transition necessary to

generate the observed baryon asymmetry in the universe. In calculating the

signal-to-noise ratio of the gravitational waves, we incorporate the effect of

the recently discovered significant suppression of the gravitational wave

signals from sound waves for strong phase transitions, make sure that

supercooled phase transitions do complete and adopt a bubble wall velocity that

is consistent with a successful electroweak baryogenesis by solving the

velocity profiles of the plasma. The high-luminosity LHC sensitivity to the

singlet scalar extension of the SM is estimated using a shape-based analysis of

the invariant $4b$ mass distribution. We find that while the region of

parameter space giving detectable gravitational waves is shrunk due to the new

gravitational wave simulations, the qualitative complementary role of

gravitational waves and collider searches remain unchanged.

http://arxiv.org/icons/sfx.gif