Indirect determinations of the top quark mass

Giudice, Gian F.; Paradisi, Paride; Струмиа, Алессандро

doi:10.1007/jhep11(2015)192

Cited by 8 publications

(5 citation statements)

References 95 publications

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“…A similar comment applies to the very old idea pioneered in [81] in the case of the determination of the charm quark mass from K 0 −K 0 mixing and the top quark mass from B d −B d mixing [82] that has been extended to rare decays, in particular K + → π + νν and K L → π 0 νν, in [83]. It has recently been reconsidered in the context of general indirect determinations of m t in [84]. Even if such studies have some virtues, similar to the determination of |V cb | from rare Kaon decays [85], they necessarily assume that NP does not contribute to the processes used for such determinations at a measurable level and we should really hope that the nature will tell us soon that this assumption is wrong.…”

Section: Discussionmentioning

confidence: 87%

Kaon Theory News

Buras¹

2016

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2015)

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During the last fifteen years B s,d decays, B 0 s,d −B 0 s,d mixings, related mixing induced CP-violating asymmetries S ψK S and S ψφ and CP violation in charm decays provided the dominant information about the pattern of flavour violation within the Standard Model (SM) and its extensions. K meson physics was solely represented by the CP-violating parameter ε K which by itself could still provide a very powerful constraint on new physics (NP) models but could not offer by far as much information about the pattern of flavour violation in nature as the observables in heavy meson decays. We emphasize that in the coming years K meson physics will certainly strike back through the measurements of the branching ratios of theoretically very clean decays K + → π + νν and K L → π 0 νν and improved calculations of the ratio ε /ε provided recently by lattice QCD and large N approach. Also the improved calculations of the K 0 −K 0 mass difference ∆M K could be of help in this context. We summarize the status of K + → π + νν and K L → π 0 νν within the SM and simplified NP models and update the picture of flavour violation in the Littlest Higgs model with T-parity (LHT) taking all available constraints into account. But the highlight of this talk are new results on ε /ε from lattice QCD and large N approach that give a strong indication for a new anomaly in flavour physics, this time coming from K mesons. Indeed, ε /ε within the SM is found to be significantly below the data of NA48 and KTeV collaborations. Combining lattice results on the non-perturbative parameters B(1/2) 6 and B(3/2) 8 with the assumption that the SM dynamics dominates the ∆I = 1/2 rule a 3σ anomaly in ε /ε emerges. Moreover, the recently derived upper bounds on B(1/2) 6 and B(3/2) 8 from large N approach with B(1/2) 6 ≤ B(3/2) 8 < 1, fully consistent with lattice results, increase the confidence that the found anomaly could be an important signal of NP at work. Of particular importance are the correlations between K + → π + νν, K L → π 0 νν and ε /ε. With future precise measurements of K + → π + νν and K L → π 0 νν and improved calculations of ε /ε they will surely provide powerful tools for selecting the favourite NP models. We illustrate this with the help of the LHT model and simplified models in which NP in K → πνν and ε /ε is governed by Z with flavour violating couplings or by a heavy Z .

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Section: Discussionmentioning

confidence: 87%

Kaon Theory News

Buras¹

2016

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2015)

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“…The ratios κ qµ ∼ (m MS t /m W ) 2 scale with the second power of the topquark mass in the MS scheme and, in principle, might be used to determine the top-quark mass in rare flavour processes under the assumption that κ qµ are not affected by NP contributions, which is still a possibility. A discussion of other examples in flavour physics that require the knowledge of CKM input and the corresponding prospects can be found in [53]. The MS mass is actually the preferred scheme for rare decay calculations over the pole scheme (OS), which however is used in many collider physics applications and provided in the PDG [32].…”

Section: The Issue Of M T In Rare Decaysmentioning

confidence: 99%

Searching for New Physics with $\bar {\mathcal {B}}(B_{s,d}\to \mu \bar \mu )/\Delta M_{s,d}$

Bobeth¹,

Buras²

2021

Acta Phys. Pol. B

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We reemphasize that the ratio R sµ ≡B(B s → µμ)/∆M s is a measure of the tension of the Standard Model (SM) with the latest measurements ofB(B s → µμ) that does not suffer from the persistent puzzle on the |V cb | determinations from inclusive versus exclusive b → c ν decays and which affects the value of the CKM element |V ts | that is crucial for the SM predictions of bothB(B s → µμ) and ∆M s , but cancels out in the ratio R sµ . In our analysis, we include higher-order electroweak and QED corrections and adapt the latest hadronic input to find a tension of about 2σ for R sµ measurements with the SM independently of |V ts |. We also discuss the ratio R dµ which could turn out, in particular in correlation with R sµ , to be useful for the search for new physics, when data on both ratios improve. R dµ is also independent of |V cb | or more precisely |V td |.

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“…Top quark loops affect various lower-energy observables, that are thereby sensitive to the top quark mass. Previous work found that SM fits will not allow precise enough measurements of the top mass M t [21]. As a consequence, the only option to measure M t better is to measure it at future colliders.…”

Section: The Sm Vacuum (In)stabilitymentioning

confidence: 99%

The collider landscape: which collider for establishing the SM instability?

Franceschini

Струмиа²,

Wulzer³

2022

J. High Energ. Phys.

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Capabilities of future colliders are usually discussed assuming specific hypothetical new physics. We consider the opposite possibility: that no new physics is accessible, and we want to learn if the unnatural Standard Model is part of a vast landscape. We argue that a main step in this direction would be establishing the possible instability scale of the Higgs potential. This primarily needs reducing the uncertainty on the strong coupling and on the top quark mass. We show that the top quark mass can be measured well enough via a $$ t\overline{t} $$ t t ¯ threshold scan with low 1033 cm−2sec−1 luminosity, that seems achievable at a ‘small’ e+e− collider in the LEP tunnel, or at a muon collider demonstrator.

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Indirect determinations of the top quark mass

Cited by 8 publications

References 95 publications

Kaon Theory News

Kaon Theory News

Searching for New Physics with \(\bar {\mathcal {B}}(B_{s,d}\to \mu \bar \mu )/\Delta M_{s,d}\)

The collider landscape: which collider for establishing the SM instability?

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