A Multi-TeV (ss ​ = 1.5 - 10 TeV) Muon Collider providing O(ab−1)O(ab−1) integrated luminosity will be a great opportunity to probe the most intimate nature of the Standard Model (SM) and the Electroweak Symmetry Breaking mechanism, allowing the precise measurement of the Higgs couplings to several SM particles. The study of the Higgs boson couplings to the second generations of fermions is of particular interest due to sensitivity to a whole class of new physics models. It is also true that this measurement is extremely challenging, because of the small branching ratio. Indeed, it is currently not accessible at LHC, where the quantum chromodynamics processes are overwhelming. In this paper it is explored, for the first time, the search for H→ccˉH→ccˉ at a Multi-TeV Muon Collider. The μ+μ−→Hννˉ→ccˉννˉμ+μ−→Hννˉ→ccˉννˉ signal process has been fully simulated and reconstructed at s=1.5  TeVs ​=1.5TeV with a preliminary detector design, along with the main physics backgrounds. The machine background originated from the decay of beam muons, the so-called Beam Induced Background (BIB), is not included in this preliminary study. A c quark-tagging algorithm has been developed, combining several observables in a single discriminator using Machine Learning techniques, with the goal to improve the rejection of jets coming from b-quark and u-d-s-g hadronization. A first estimate of the precision on the Higgs coupling with c-quark reachable with a Muon Collider machine is presented. The relative uncertainty on the coupling at s=1.5  TeVs ​=1.5TeV is estimated to be 5.5 %%. A projection to s=3  TeVs ​=3TeV shows that the precision improves with increasing energy, reaching the value of 2.6%2.6%.

{Search for $H \rightarrow c \bar{c}$ at a Multi-TeV Muon Collider}

Colaleo Anna;Errico Filippo;Venditti Rosamaria;Zaza Angela
2021-01-01

Abstract

A Multi-TeV (ss ​ = 1.5 - 10 TeV) Muon Collider providing O(ab−1)O(ab−1) integrated luminosity will be a great opportunity to probe the most intimate nature of the Standard Model (SM) and the Electroweak Symmetry Breaking mechanism, allowing the precise measurement of the Higgs couplings to several SM particles. The study of the Higgs boson couplings to the second generations of fermions is of particular interest due to sensitivity to a whole class of new physics models. It is also true that this measurement is extremely challenging, because of the small branching ratio. Indeed, it is currently not accessible at LHC, where the quantum chromodynamics processes are overwhelming. In this paper it is explored, for the first time, the search for H→ccˉH→ccˉ at a Multi-TeV Muon Collider. The μ+μ−→Hννˉ→ccˉννˉμ+μ−→Hννˉ→ccˉννˉ signal process has been fully simulated and reconstructed at s=1.5  TeVs ​=1.5TeV with a preliminary detector design, along with the main physics backgrounds. The machine background originated from the decay of beam muons, the so-called Beam Induced Background (BIB), is not included in this preliminary study. A c quark-tagging algorithm has been developed, combining several observables in a single discriminator using Machine Learning techniques, with the goal to improve the rejection of jets coming from b-quark and u-d-s-g hadronization. A first estimate of the precision on the Higgs coupling with c-quark reachable with a Muon Collider machine is presented. The relative uncertainty on the coupling at s=1.5  TeVs ​=1.5TeV is estimated to be 5.5 %%. A projection to s=3  TeVs ​=3TeV shows that the precision improves with increasing energy, reaching the value of 2.6%2.6%.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/531261
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