Abstract
We show that both flavor-conserving and flavor-violating Yukawa couplings of the Higgs boson to first- and second-generation quarks can be probed by measuring rare decays of the form h→MV, where M denotes a vector meson and V indicates either γ, W or Z. We calculate the branching ratios for these processes in both the standard model and its possible extensions. We discuss the experimental prospects for their observation. The possibility of accessing these Higgs couplings appears to be unique to the high-luminosity LHC and future hadron colliders, providing further motivation for those machines.
Highlights
Introduction.—The discovery of a Higgs-like boson by the ATLAS and CMS collaborations [1,2] ushered in a new era of exploration driven by the desire to understand the properties of this new state
3Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel 4High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 5Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, USA (Received 18 June 2014; published 10 March 2015). We show that both flavor-conserving and flavor-violating Yukawa couplings of the Higgs boson to first- and second-generation quarks can be probed by measuring rare decays of the form h → MV, where M denotes a vector meson and V indicates either γ, W or Z
The ATLAS and CMS collaborations have studied the possibility of measuring the Higgs couplings to muons at the high-luminosity LHC (HLLHC) with encouraging results [8,9,10]
Summary
Kagan,1,* Gilad Perez,2,3,† Frank Petriello,4,5,‡ Yotam Soreq,3,§ Stoyan Stoynev,5,¶ and Jure Zupan1,∥ We show that both flavor-conserving and flavor-violating Yukawa couplings of the Higgs boson to first- and second-generation quarks can be probed by measuring rare decays of the form h → MV, where M denotes a vector meson and V indicates either γ, W or Z. The possibility of accessing these Higgs couplings appears to be unique to the high-luminosity LHC and future hadron colliders, providing further motivation for those machines. Probes of the electroweak couplings of the Higgs boson via h → MZ; MW decays have been discussed in Ref. These rare decays are only accessible at the HL-LHC and future high-energy colliders, due to their small branching ratios (BRs).
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