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Measuring the signal strength in tt¯HwithH→bb¯.

Moretti, Niccolo and Petrov, Petar and Pozzorini, Stefano and Spannowsky, Michael (2016) 'Measuring the signal strength in tt¯HwithH→bb¯.', Physical review D., 93 (1). 014019.


A precise measurement of the Higgs boson couplings to bottom and top quarks is of paramount importance during the upcoming LHC runs. We present a comprehensive analysis for the Higgs production process in association with a semileptonically decaying top-quark pair and subsequent Higgs boson decay into bottom quarks. Due to the highly complex final state and large Standard Model backgrounds, measuring the signal strength in this process is known to be challenging. To maximize the sensitivity, we analyze different, statistically independent, phase space regions, where one or more of the heavy resonances are boosted. This allows us to employ jet substructure techniques, which help to reduce large t¯t þ X backgrounds. We find that combining several t¯tHðbb¯Þ phase space regions will allow one to measure deviations of the Standard Model signal strength of order 20% with 3 ab−1.

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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review D 93, 014019 © (2016) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:08 November 2015
Date deposited:26 January 2017
Date of first online publication:21 January 2016
Date first made open access:26 January 2017

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