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Model-independent measurement of the e (Formula presented.) e (Formula presented.) (Formula presented.) HZ cross section at a future e (Formula presented.) e (Formula presented.) linear collider using hadronic Z decays


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Abstract

A future e+e- collider, such as the ILC or CLIC, would allow the Higgs sector to be probed with a precision significantly beyond that achievable at the High-Luminosity LHC. A central part of the Higgs programme at an e+e- collider is the model-independent determination of the absolute Higgs couplings to fermions and to gauge bosons. Here the measurement of the e+e-->HZ Higgsstrahlung cross section, using the recoil mass technique, sets the absolute scale for all Higgs coupling measurements. Previous studies have considered e+e- ->ZH with Z->l+l-, where l = electron or muon. In this paper it is shown for the first time that a near model-independent recoil mass technique can be extended to the hadronic decays of the Z boson. Because the branching ratio for Z->qq is approximately ten times greater than for Z->l+l-, this method is statistically more powerful than using the leptonic decays. For an integrated luminosity of 500 fb-1 at a centre-of-mass energy of 350 GeV at CLIC, the e+e-->HZ cross section can be measured to 1.8 % using the hadronic recoil mass technique. A similar precision is found for the ILC operating at 350 GeV. The centre-of-mass dependence of this measurement technique is discussed, arguing for the initial operation of a future linear collider at just above the top-pair production threshold.

Description

Keywords

hep-ex, hep-ex, hep-ph

Journal Title

European Physical Journal C

Conference Name

Journal ISSN

1434-6044
1434-6052

Volume Title

76

Publisher

Springer Science and Business Media LLC
Sponsorship
Science and Technology Facilities Council (ST/H000534/1)
The author would like to thank: colleagues in the CLICdp collaboration, in particular Christian Grefe, Philipp Roloff and André Sailer for their tireless work in generating the CLIC MC samples used in this study; colleagues in the ILD detector concept for generating the ILC MC samples used for the results reported in Sect. 4; Aharon Levy and Lucie Linssen for their valuable comments on the first drafts of this paper; Aidan Robson, Sophie Redford and Philipp Roloff for their comments on the final drafts of this paper; and the UK STFC and CERN for their financial support.