Phenomenology 2019 Symposium

Session

Higgs III

6

7 May 2019, 16:30

105 (Lawrence Hall)

Conveners

Higgs III

• Ian Lewis (The University of Kansas)

842. Searches for rare decays of the Higgs boson at CMS

Hao-Ren Jheng (National Central University (TW))

07/05/2019, 16:30

parallel talk

791. Searches for Higgs boson exotic decays at CMS

Aashaq Shah (University of Delhi (IN))

07/05/2019, 16:45

parallel talk

Exotic decays of the 125 GeV Higgs boson can offer an alternative avenue to probe physics beyond the standard models such as two-Higgs-doublet model extended with a complex scalar singlet (2HDM + S) and next-to-minimal super-symmetric model (NMSSM). Light bosons with masses less than half of the Higgs boson mass are probed in final states containing two muons and two b quarks, or two muons and...

763. Enhancing electroweak phase transition in the spontaneous $Z_2$-breaking singlet extension of the SM

Yikun Wang (THE UNIVERSITY OF CHICAGO)

07/05/2019, 17:00

parallel talk

Singlet extensions of the Standard Model (SM) provide unique test of the paradigm of strongly first order electroweak phase transition (EWPhT). We study the real singlet extension of the SM with spontaneous $Z_2$-breaking, and its impact on the strength of the electroweak phase transition as well as the corresponding phenomenology. We find various phase transition patterns rendering a strongly...

750. Non-resonant Higgs production with a singlet

Haider Alhazmi

07/05/2019, 17:15

We investigate the collider signature of the real singlet extension of the standard model.
A definitive correlation exists between the strength of the phase transition and the trilinear coupling of the Higgs to two singlet-like scalars, and hence between the phase transition and non-resonant scalar pair production involving the singlet at colliders.
We study the prospects for observing these...

741. EFT Effects in the Singlet Extended Standard Model

Shekhar Adhikari

07/05/2019, 17:30

Standard model is successful in explaining Higgs physics, however new physics beyond the standard model may yet be expected. We study how the inclusion of real singlet scalar and dimension 5 operators effect SM Higgs physics. We do this by studying the deviations of the total width and branching ratios of the Higgs from the SM predictions. We also study the limit on scalar mixing angle and...

660. Collider and Gravitational Wave Complementarity in Exploring the Singlet Extension of the Standard Model

Dan Vagie

07/05/2019, 17:45

We present a dedicated complementarity study of gravitational wave and collider
measurements of the simplest extension of the Higgs sector: the singlet scalar augmented Standard
Model. We study the following issues: (i) the electroweak phase transition patterns admitted by the model, and the proportion of parameter space for each pattern; (ii) the regions of parameter space that give...

659. Understanding recent collider excesses in light of light Higgs bosons

Evan Johnson (Ohio State University)

07/05/2019, 18:00

parallel talk

Although the discovered scalar with a mass of 125 GeV appears to have the properties of the Standard Model Higgs, it remains a possibility that it belongs to an enlarged scalar sector containing other Higgs bosons waiting to be discovered. Motivated by the recent CMS and ATLAS diphoton excesses near 95 GeV, we consider a Type-I two-Higgs-doublet model in regions of high fermiophobia allowing...

684. Higgs Parity, Strong CP, and Dark Matter

David Dunsky (UC Berkeley)

07/05/2019, 18:15

parallel talk

An exact spacetime parity replicates the $SU(2) \times U(1)$ electroweak interaction, the Higgs boson $H$, and the matter of the Standard Model. This "Higgs Parity" and the mirror electroweak symmetry are spontaneously broken at scale $v' = \langle{H'}\rangle \gg \langle{H}\rangle$, yielding the Standard Model below $v'$ with a quartic coupling that essentially vanishes at $v'$:...

862. .