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Published April 2014 | Published + Submitted
Journal Article Open

Extracting Effective Higgs Couplings in the Golden Channel


Kinematic distributions in Higgs decays to four charged leptons, the so called 'golden channel', are a powerful probe of the tensor structure of its couplings to neutral electroweak gauge bosons. In this study we construct the first part of a comprehensive analysis framework designed to maximize the information contained in this channel in order to perform direct extraction of the various possible Higgs couplings. To that end we first complete an earlier analytic calculation of the leading order fully differential cross sections for the golden channel signal and background to include the 4e and 4μ final states with interference between identical final states. We also examine the relative fractions of the different possible combinations of scalar-tensor couplings by integrating the fully differential cross section over all kinematic variables as well as show various doubly differential spectra for both the signal and background. From these analytic expressions we then construct a 'generator level' analysis framework based on the maximum likelihood method. We demonstrate the ability of our framework to perform multi-parameter extractions of all the possible effective couplings of a spin-0 scalar to pairs of neutral electroweak gauge bosons including any correlations. This framework provides a powerful method for study of these couplings and can be readily adapted to include the relevant detector and systematic effects which we demonstrate in an accompanying study to follow.

Additional Information

© 2013 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Published for SISSA by Springer. Article funded by SCOAP3. Received: January 6, 2014; Accepted: March 6, 2014; Published: April 8, 2014. We thank Artur Apresyan, Emanuele DiMarco, Adam Falkowski, Andrei Gritsan, Roni Harnik, Alex Mott, Nhan Tran, Roberto Vega, Si Xie, and Felix Yu for helpful discussions and Kunal Kumar and Shashank Shalgar for help in validation with Madgraph. We especially thank Ian Low, Joe Lykken and Maria Spiropulu for providing us with the resources and guidance necessary to complete this study. R.V.M. is supported by the Fermilab Graduate Student Fellowship in Theoretical Physics and the ERC Advanced Grant Higg@LHC. Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. Y.C. is supported by the Weston Havens Foundation and DOE grant No. DE-FG02-92-ER-40701. This work is also sponsored in part by the DOE grant No. DE-FG02-91ER40684.

Attached Files

Published - art_10.1007_JHEP04_2014_057.pdf

Submitted - 1310.2893v1.pdf


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