John M. Campbell
Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+
Campbell, John M.; Ellis, R. Keith; Williams, Ciaran
Abstract
We revisit the hadronic production of the four-lepton final state, e − e + μ − μ + , through the fusion of initial state gluons. This process is mediated by loops of quarks and we provide first full analytic results for helicity amplitudes that account for both the effects of the quark mass in the loop and off-shell vector bosons. The analytic results have been implemented in the Monte Carlo program MCFM and are both fast, and numerically stable in the region of low Z transverse momentum. We use our results to study the interference between Higgs-mediated and continuum production of four-lepton final states, which is necessary in order to obtain accurate theoretical predictions outside the Higgs resonance region. We have confirmed and extended a recent analysis of Caola and Melnikov that proposes to use a measurement of the off-shell region to constrain the total width of the Higgs boson. Using a simple cut-and-count method, existing LHC data should bound the width at the level of 25–45 times the Standard Model expectation. We investigate the power of using a matrix element method to construct a kinematic discriminant to sharpen the constraint. In our analysis the bound on the Higgs width is improved by a factor of about 1.6 using a simple cut on the MEM discriminant, compared to an invariant mass cut m 4l > 300 GeV.
Citation
Campbell, J. M., Ellis, R. K., & Williams, C. (2014). Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+. Journal of High Energy Physics, 2014(04), Article 060. https://doi.org/10.1007/jhep04%282014%29060
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 4, 2014 |
Online Publication Date | Apr 9, 2014 |
Publication Date | Apr 9, 2014 |
Deposit Date | Jul 11, 2018 |
Publicly Available Date | Aug 24, 2018 |
Journal | Journal of High Energy Physics |
Print ISSN | 1126-6708 |
Publisher | Scuola Internazionale Superiore di Studi Avanzati (SISSA) |
Peer Reviewed | Peer Reviewed |
Volume | 2014 |
Issue | 04 |
Article Number | 060 |
DOI | https://doi.org/10.1007/jhep04%282014%29060 |
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Copyright Statement
Open Accesss, © The Author(s) 2014. Article funded by SCOAP3. 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.
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