Jul 15 – 19, 2019
US/Eastern timezone

Charm-quark Yukawa Coupling in $h\rightarrow c\bar{c}\gamma$ at LHC

Jul 16, 2019, 3:15 PM
2213 A Chair : Alessandro Vicini

2213 A Chair : Alessandro Vicini

Higgs/EW/BSM Higgs/EW/BSM


Xing Wang (University of Pittsburgh)


It is extremely challenging to probe the charm-quark Yukawa coupling at hadron colliders primarily due to the large Standard Model (SM) background (including $h\to b\bar b$) and the lack of an effective trigger for the signal $h\to c\bar c$. We examine the feasibility of probing this coupling at the LHC via a Higgs radiative decay $h\rightarrow c\bar{c}\gamma$. The existence of an additional photon in the final state may help for the signal identification and background suppression. Adopting a refined triggering strategy and utilizing basic machine learning, we find that a coupling limit of about 8 times the SM value may be reached with $2\sigma$ sensitivity after the High Luminosity LHC (HL-LHC). Our result is comparable and complementary to other projections for direct and indirect probes of $h\to c\bar c$ at the HL-LHC. Without a significant change in detector capabilities, there would be no significant improvement for this search from higher energy hadron colliders.

Primary authors

Benjamin Nachman (LBNL) Prof. Tao Han (Univ. of Pittsburgh) Xing Wang (University of Pittsburgh)

Presentation materials