Top Yukawa Coupling at the Muon Collider

Chen, Miranda; Li, Da

doi:10.48550/arxiv.2212.11067

Cited by 1 publication

(4 citation statements)

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“…6 On the other hand, a muon collider is naturally suited to employ similar off-shell methods as the LHC. Off-shell methods have already been shown to enable a measurement on y t of 1.5% [32,33] 7 at a 10 TeV muon collider, far better than attainable from on-shell t tH production [14]. Applying these methods to V V production to unambiguously fix κ V and remove the flat direction is a natural next step.…”

Section: Jhep01(2024)182mentioning

confidence: 99%

“…For example, the trilinear Higgs coupling can be measured, and there are additional observables that can test Higgs precision. As an example of this, we have included the precision achievable for a generic modification of single Higgs couplings demonstrated in this paper, as well as measurement of the triple Higgs coupling [4,15] and a measurement of the top Yukawa using interference methods [32,33] in figure 13.…”

Section: Jhep01(2024)182mentioning

confidence: 99%

“…No assumptions are made for the 250 GeV e + e − + HL-LHC fit, since the direct search reach is not high enough to justify any. The muon collider fit results assume forward muon tagging up to |η| ≤ 6 and use the off-shell y t constraint of 1.5% from [32,33].…”

Section: Jhep01(2024)182mentioning

confidence: 99%

“…In [32,33], the capabilities of off-shell methods at a muon collider for a measurement of the top Yukawa coupling were explored, giving a precision of 1.5% including the semileptonic and hadronic channels. This measurement does not use the same methodology as we havein particular, they work with the top quarks without simulating their decays and do not perform any fast detector simulation.…”

Section: B Fitting Proceduresmentioning

confidence: 99%

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Precision Higgs width and couplings with a high energy muon collider

Forslund,

Meade

2024

J. High Energ. Phys.

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The interpretation of Higgs data is typically based on different assumptions about whether there can be additional decay modes of the Higgs or if any couplings can be bounded by theoretical arguments. Going beyond these assumptions requires either a precision measurement of the Higgs width or an absolute measurement of a coupling to eliminate a flat direction in precision fits that occurs when $$ \left|{g}_{hVV}/{g}_{hVV}^{SM}\right| $$ g hVV / g hVV SM > 1, where V = W±, Z. In this paper we explore how well a high energy muon collider can test Higgs physics without having to make assumptions on the total width of the Higgs. In particular, we investigate off-shell methods for Higgs production used at the LHC and searches for invisible decays of the Higgs to see how powerful they are at a muon collider. We then investigate the theoretical requirements on a model which can exist in such a flat direction. Combining expected Higgs precision with other constraints, the most dangerous flat direction is described by generalized Georgi-Machacek models. We find that by combining direct searches with Higgs precision, a high energy muon collider can robustly test single Higgs precision down to the $$ \mathcal{O}\left(.1\%\right) $$ O .1 % level without having to assume SM Higgs decays. Furthermore, it allows one to bound new contributions to the width at the sub-percent level as well. Finally, we comment on how even in this difficult flat direction for Higgs precision, a muon collider can robustly test or discover new physics in multiple ways. Expanding beyond simple coupling modifiers/EFTs, there is a large region of parameter space that muon colliders can explore for EWSB that is not probed with only standard Higgs precision observables.

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Section: Jhep01(2024)182mentioning

confidence: 99%