Search for the Higgs boson decaying to a pair of charm quarks at a future Multi-TeV Muon Collider

Mastrapasqua, P. and Colaleo, A. and Errico, F. and Venditti, R. and Zaza, A. (2022) Search for the Higgs boson decaying to a pair of charm quarks at a future Multi-TeV Muon Collider. Il nuovo cimento C, 45 (5). pp. 1-4. ISSN 1826-9885

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Abstract

This paper presents a feasibility study aiming to estimate the precision achievable on the Higgs-to-charm-quark coupling at a future Muon Collider. The accurate measurement of the Yukawa couplings is of invaluable importance in High Energy Particle Physics, as it sheds light on the Electroweak Symmetry Breaking mechanism. In particular, the couplings to the second generations of fermions are of extreme interest due to sensitivity to a whole class of new physics models, but their measurement is extremely challenging, because of the small branching ratio. The coupling to charm quark, especially, is currently not accessible at LHC but could be probed at future lepton colliders. Within this work, the search for H → cc¯ at Muon Collider has been performed. The μ+μ− → Hνν¯ → ccν¯ ν¯ signal process has been fully simulated and reconstructed at √s = 1.5 TeV, along with the main physics backgrounds. The machine background originating from the decay of muons in the beam, the so-called Beam Induced Background, is not included in this preliminary study. With the aim of improving the rejection of jets coming from b-quark and u-d-s-g hadronization, a charm quark tagging algorithm has been developed by employing Machine Learning techniques. Finally, the relative uncertainty on the coupling at √s = 1.5 TeV is estimated to be 5.5%. A projection to √s = 3 TeV shows that precision improves with increasing energy, reaching the value of 2.6%.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	06 Sep 2022 12:46
Last Modified:	06 Sep 2022 12:46
URI:	http://eprints.bice.rm.cnr.it/id/eprint/22016

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