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Interference effects in the H(→γγ)+2 jets channel at the LHC

Coradeschi, F. and de Florian, D. and Dixon, L. J. and Fidanza, N. and Höche, S. and Ita, H. and Li, Y. and Mazzitelli, J. (2015) Interference effects in the H(→γγ)+2 jets channel at the LHC. Physical Review D, 92 (1). Art. No. 013004. ISSN 2470-0010. doi:10.1103/PhysRevD.92.013004.

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We compute the interference between the resonant process pp→H(→γγ)+2 jets and the corresponding continuum background at leading order in QCD. For the Higgs signal, we include gluon fusion (GF) and vector boson fusion (VBF) production channels, while for the background we consider all tree-level contributions, including pure EW effects (O(α^4_(QED))) and QCD contributions (O(α^2_(QED) α^2_s)), plus the loop-induced gluon-initiated process. After convolution with the experimental mass resolution, the main effect of the interference is to shift the position of the mass peak, as in the inclusive GF case studied previously. The apparent mass shift is small in magnitude but strongly dependent on the Higgs width, potentially allowing for a measurement of, or bound on, the width itself. In the H(→γγ)+2 jets channel, the VBF and GF contributions generate shifts of opposite signs which largely cancel, depending on the sets of cuts used, to as little as 5 MeV (toward a lower Higgs mass). The small magnitude of the shift makes this channel a good reference mass for measuring the inclusive mass shift of around 60 MeV in the Standard Model.

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Additional Information:© 2015 American Physical Society. Received 4 May 2015; published 8 July 2015. This work was supported in part by UBACYT, CONICET, ANPCyT, the Research Executive Agency (REA) of the European Union under Grant Agreement No. PITN-GA-2010-264564 (LHCPhenoNet), the U.S. Department of Energy under Contract No. DE–AC02–76SF00515, the Walter Burke Institute at Caltech, and the Gordon and Betty Moore Foundation through Grant No. 776 to the Caltech Moore Center for Theoretical Cosmology and Physics. L.D. and D. d. F. thank the Galileo Galilei Institute for hospitality during a portion of this work.
Group:Walter Burke Institute for Theoretical Physics, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Universidad de Buenos Aires Secretaría de Ciencia y Técnica (UBACYT)UNSPECIFIED
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)UNSPECIFIED
Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT)UNSPECIFIED
European Union Research Executive Agency (REA)PITN-GA-2010-264564
Department of Energy (DOE)DE–AC02– 76SF00515
Caltech Walter Burke Institute for Theoretical PhysicsUNSPECIFIED
Gordon and Betty Moore Foundation776
Caltech Moore Center for Theoretical Cosmology and PhysicsUNSPECIFIED
Issue or Number:1
Classification Code:PACS numbers: 14.80.Bn, 12.38.Bx, 13.85.-t
Record Number:CaltechAUTHORS:20150603-073442246
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57960
Deposited By: Ruth Sustaita
Deposited On:03 Jun 2015 17:59
Last Modified:10 Nov 2021 21:57

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