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8D likelihood effective Higgs couplings extraction framework in h → 4ℓ

Chen, Yi and Di Marco, Emanuele and Lykken, Joe and Spiropulu, Maria and Vega-Morales, Roberto and Xie, Si (2015) 8D likelihood effective Higgs couplings extraction framework in h → 4ℓ. Journal of High Energy Physics, 2015 (1). Art. No. 125. ISSN 1126-6708. doi:10.1007/JHEP01(2015)125.

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We present an overview of a comprehensive analysis framework aimed at performing direct extraction of all possible effective Higgs couplings to neutral electroweak gauge bosons in the decay to electrons and muons, the so called ‘golden channel’. Our framework is based primarily on a maximum likelihood method constructed from analytic expressions of the fully differential cross sections for h → 4ℓ and for the dominant irreducible qq[bar] → 4ℓ background, where 4ℓ = 2e2μ, 4e, 4μ. Detector effects are included by an explicit convolution of these analytic expressions with the appropriate transfer function over all center of mass variables. Utilizing the full set of observables, we construct an unbinned detector-level likelihood which is continuous in the effective couplings. We consider possible ZZ, Zγ, and γγ couplings simultaneously, allowing for general CP odd/even admixtures. A broad overview is given of how the convolution is performed and we discuss the principles and theoretical basis of the framework. This framework can be used in a variety of ways to study Higgs couplings in the golden channel using data obtained at the LHC and other future colliders.

Item Type:Article
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URLURL TypeDescription Paper
Chen, Yi0000-0003-2582-6469
Spiropulu, Maria0000-0001-8172-7081
Xie, Si0000-0003-2509-5731
Alternate Title:8D Likelihood Effective Higgs Couplings Extraction Framework in the Golden Channel
Additional Information:© 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. Article funded by SCOAP3. Received: April 12, 2014; Revised: October 17, 2014; Accepted: December 25, 2014; Published: January 23, 2015. The authors are grateful to Artur Apresyan, Michalis Bachtis, Adam Falkowski, Patrick Fox, Andrei Gritsan, Roni Harnik, Alex Mott, Pavel Nadolsky, Daniel Stolarski, Reisaburo Tanaka, Nhan Tran, Roberto Vega, and Felix Yu for helpful discussions as well as the ATLAS and CMS collaborations for their encouragement and interest in this work. R.V.M. is supported by the Fermilab Graduate Student Fellowship in Theoretical Physics and the ERC Advanced Grant Higgs@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 DE-FG02-92-ER-40701. This work is also sponsored in part by the DOE grant No. DE-FG02-91ER40684. R.V.M is also grateful to the CalTech physics department for their hospitality during which much of this work was done. This work used the Extreme Science and Engineering Discovery Environment(XSEDE), which is supported by National Science Foundation grant number OCI-1053575.
Funding AgencyGrant Number
European Research Council (ERC)UNSPECIFIED
Department of Energy (DOE)DE-AC02-07CH11359
Weston Havens FoundationUNSPECIFIED
Department of Energy (DOE)DE-FG02-92-ER-40701
Department of Energy (DOE)DE-FG02-91ER40684
Subject Keywords:Hadron-Hadron Scattering; Higgs physics
Issue or Number:1
Record Number:CaltechAUTHORS:20140122-123544040
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Official Citation:Chen, Y., Di Marco, E., Lykken, J., Spiropulu, M., Vega-Morales, R., & Xie, S. (2015). 8D likelihood effective Higgs couplings extraction framework in h → 4ℓ. Journal of High Energy Physics, 2015(1), 1-26. doi: 10.1007/jhep01(2015)125
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43472
Deposited By: Ruth Sustaita
Deposited On:22 Jan 2014 21:39
Last Modified:10 Nov 2021 16:38

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