Impact of CDF-II measurement of $M_W$ on the electroweak legacy of the LHC Run II

Almeida, Eduardo da Silva; Alves, Alexandre Florindo; Éboli, Oscar José Pinto; Gonzalez-Garcia, M. C.

doi:10.48550/arxiv.2204.10130

Cited by 5 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The impact of the shifted W mass value is greatly absorbed by the 3rdgeneration-quark operators. There are several papers [75][76][77][78][79][80][81][82][83][84] have appeared that also study the impact of the new m W measurement on the new physics scenarios, especially on the SMEFT fit and oblique parameters. These results have a generally good agreement with our results.…”

Section: Impacts Of the New W -Mass Measurement At Cdfmentioning

confidence: 99%

Probing Top-quark Operators with Precision Electroweak Measurements

Liu¹,

Wang²,

Zhang³

et al. 2022

Preprint

View full text Add to dashboard Cite

In the Standard Model Effective Field Theory (SMEFT), operators involving the top quark are generally difficult to probe, and can generate sizable loop contributions to the electroweak precision observables, measured by past and future lepton colliders. Could the high precision of the electroweak measurements compensate the loop suppression and provide competitive reaches on these operators? Would the inclusion of these contributions introduce too many additional parameters for a meaningful global electroweak analysis to be done? In this paper, we perform a detailed phenomenological study to address these two important questions. Focusing on eight dimension-6 operators that generate anomalous couplings between the electroweak gauge bosons and the third-generation quarks, we calculate their one loop contributions to the e + e − → f f processes both on and off the Z-pole and the e − e + → W W process. A global analysis is performed with these eight operators and the ones that contribute to the above processes at tree level, using the measurements at LEP, SLC and several low energy experiments. We find that, while the current electroweak precision measurements are sensitive to the one-loop effects of the topquark operators, it is difficult to separate them from the operators that contribute at the tree level, making a global analysis rather challenging. Under more assumptions (for instance that the new physics contribute only to the third generation quark operators and the S, T parameters), competitive reaches could be obtained in a global fit. Another important finding of our study is that the two operators that generate dipole interactions of the bottom quark have significant impacts in the Z-pole measurements and should not be omitted. We also discuss the implication of the recently reported W-boson mass measurement at CDF to our results. Finally, we estimate the reaches of future lepton colliders in probing the top-quark operators with precision electroweak measurements.

show abstract

Section: Impacts Of the New W -Mass Measurement At Cdfmentioning

confidence: 99%

Probing Top-quark Operators with Precision Electroweak Measurements

Liu¹,

Wang²,

Zhang³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…If the new, larger measurement for m W from the CDF collaboration [77] is incorporated into a global electroweak precision fit, it favors positive values for T . Taking S and the other electroweak precision parameters to be negligible, as is the case in our model, updated fits [80][81][82][84][85][86][87][88][89][90] suggest T lying in the range [0.1, 0.3]. In Fig.…”

Section: A Electroweak Precision Observablesmentioning

confidence: 97%

“…If confirmed, this measurement would suggest the existence of sources of custodial symmetry breaking in new physics. In particular, it suggests that the precision electroweak parameter T [78,79] lies in the range 0.1 − 0.3, the precise value depending on the treatment of other experimental input and on the assumptions made about the combination with other precision parameters [80][81][82][83][84][85][86][87][88][89][90]. Several studies suggest that 2HDMs can accommodate these values [91][92][93][94][95][96][97][98][99].…”

Section: Introductionmentioning

confidence: 99%

Composite two-Higgs doublet model from dilaton effective field theory

Appelquist,

Ingoldby,

Piai

2022

Preprint

View full text Add to dashboard Cite

We construct a composite two-Higgs-doublet model (2HDM) within the context of dilaton effective field theory. This EFT describes the particle spectrum observed in lattice simulations of a near-conformal SU (3) gauge field theory. A second Higgs doublet is naturally accommodated within the EFT, used previously to construct a one-Higgs-doublet model. We explore the interplay of phenomenological and EFT requirements, supplemented by information from numerical lattice studies of the SU (3) gauge theory with eight fundamental (Dirac) fermions. We build a viable model with moderate parameter tuning. In the relevant portion of parameter space, we match the model to a conventional general description of 2HDMs, and comment on the role of custodial symmetry (breaking) in the scalar potential. Contributions to the precision electroweak parameter T provide a possible explanation for the recent measurement of the W-boson mass by CDF II.1 We adopt Mπ = 4 TeV as an indicative reference mass scale for the PNGBs. This scale could be lowered, and the fine tuning further softened, as some experimental bounds from direct searches involve suppressed model-dependent couplings that enter certain production rates. See for instance Refs. [71,72] for useful dedicated phenomenological studies.

show abstract

“…This study is motivated, in part, by recent the measurement of the W boson's mass at the CDF experiment [41]. With high significance, the collaboration reports a mass larger than predicted by precision EW data, but also one that fits naturally in the Type II Seesaw [42][43][44][45][46][47]. Subsequently, the measurement is reigniting interest in searches for doubly and singly charged scalars at the LHC [48][49][50][51].…”

Section: Jhep10(2022)200mentioning

confidence: 99%

Doubly charged Higgs boson production at hadron colliders II: a Zee-Babu case study

Ruiz

2022

J. High Energ. Phys.

View full text Add to dashboard Cite

Motivated by searches for so-called leptonic scalars at the LHC and the recent measurement of the W boson’s mass at the Tevatron, we revisit the phenomenology of the Zee-Babu model for neutrino masses and the ability to differentiate it from the Type II Seesaw model at the LHC. We conclude that this task is much more difficult than previously believed. All inputs equal in the two scenarios, we find that total and differential rates for producing pairs of doubly and singly charged scalars are identical in shape and only differ in normalization. The normalization is given by the ratio of hadronic cross sections and can be unity. Differences in cross sections are small and can be hidden by unknown branching rates. This holds for Drell-Yan, γγ fusion, and gg fusion, as well as observables at LO and NLO in QCD. This likeness allows us to reinterpret Run II limits on the Type II Seesaw and estimate projections for the HL-LHC. Using updated neutrino oscillation data, we also find that some collider observables, e.g., lepton flavor-violating branching ratios, are now sufficiently precise to provide a path forward. Other means of discrimination are also discussed. As a byproduct of this work, we report the availability of new Universal FeynRules Object libraries, the SM_ZeeBabu UFO, that enable fully differential simulations up to NLO+LL(PS) with tool chains employing MadGraph5_aMC@NLO.

show abstract

Impact of CDF-II measurement of $M_W$ on the electroweak legacy of the LHC Run II

Cited by 5 publications

References 0 publications

Probing Top-quark Operators with Precision Electroweak Measurements

Probing Top-quark Operators with Precision Electroweak Measurements

Composite two-Higgs doublet model from dilaton effective field theory

Doubly charged Higgs boson production at hadron colliders II: a Zee-Babu case study

Contact Info

Product

Resources

About