The m W − m Z interdependence in the Standard Model: a new scrutiny

Degrassi, Giuseppe; Gambino, Paolo; Giardino, Pier Paolo

doi:10.1007/jhep05(2015)154

Cited by 45 publications

(58 citation statements)

References 56 publications

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“…1 Left as a purple dashed contour. As anticipated, the limit on C H is very weak [22,23]. The constraint from the combination of LHC Higgs and diboson data is shown as a solid blue line, and we see that measurements of the Higgs couplings provide a bound on C H□ of the same order as the EWPO fit.…”

Section: Singlet Modelsupporting

confidence: 69%

“…The contribution of the operator O H occurs at 2-loops in the SM and is included using the results from Ref. [22].…”

Section: A Methodologymentioning

confidence: 99%

“…and the EWPOs are sensitive to eight combinations of these operators [13,[19][20][21], (at NLO they are sensitive to a combination of 10 operators). We also include the 2-loop contribution to M W generated by O H [22,23]. We consider tree level contributions from the following operators to Higgs data,…”

Section: A Matching Procedures and Renormalization Groupmentioning

confidence: 99%

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Putting standard model EFT fits to work

2020

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The Standard Model effective field theory (SMEFT) provides a consistent framework for comparing precision measurements at the LHC to the Standard Model. The observation of statistically significant nonzero SMEFT coefficients would correspond to physics beyond the Standard Model (BSM) of some sort. A more difficult question to answer is what, if any, detailed information about the nature of the underlying high scale model can be obtained from these measurements. In this work, we consider the patterns of SMEFT operators present in five example models and discuss the assumptions inherent in using global fits to make BSM conclusions. We find that including renormalization group effects has a significant impact on the interpretation of the results. As a by-product of our study, we present an updated global fit to SMEFT coefficients in the Warsaw basis including some next-to-leading order QCD corrections in the SMEFT theory.

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Section: Singlet Modelsupporting

confidence: 69%

“…The contribution of the operator O H occurs at 2-loops in the SM and is included using the results from Ref. [22].…”

Section: A Methodologymentioning

confidence: 99%

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Putting standard model EFT fits to work

2020

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“…Some of the POs that were used at LEP have now been calculated at the two-loop level, see Refs. [76][77][78][79][80], and twoloop renormalization of the full SM has been completed in Refs. [75,81,82].…”

Section: The Strategy: From the Multi-pole Expansion To Pseudo-observmentioning

confidence: 99%

Through precision straits to next standard model heights

David

Passarino

2016

Reviews in Physics

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After the LHC Run 1, the standard model (SM) of particle physics has been completed. Yet, despite its successes, the SM has shortcomings vis-\`{a}-vis cosmological and other observations. At the same time, while the LHC restarts for Run 2 at 13 TeV, there is presently a lack of direct evidence for new physics phenomena at the accelerator energy frontier. From this state of affairs arises the need for a consistent theoretical framework in which deviations from the SM predictions can be calculated and compared to precision measurements. Such a framework should be able to comprehensively make use of all measurements in all sectors of particle physics, including LHC Higgs measurements, past electroweak precision data, electric dipole moment, $g-2$, penguins and flavor physics, neutrino scattering, deep inelastic scattering, low-energy $e^{+}e^{-}$ scattering, mass measurements, and any search for physics beyond the SM. By simultaneously describing all existing measurements, this framework then becomes an intermediate step, pointing us toward the next SM, and hopefully revealing the underlying symmetries. We review the role that the standard model effective field theory (SMEFT) could play in this context, as a consistent, complete, and calculable generalization of the SM in the absence of light new physics. We discuss the relationship of the SMEFT with the existing kappa-framework for Higgs boson couplings characterization and the use of pseudo-observables, that insulate experimental results from refinements due to ever-improving calculations. The LHC context, as well as that of previous and future accelerators and experiments, is also addressed.Comment: 19 pages, 3 figure

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“…The GPD acceptance is defined as; |η| < 2.5, p T > 25 GeV, p ν T > 25 GeV, p W T < 15 GeV. 3 For LHCb, the kinematic acceptance is defined to be 2.0 < η < 4.5 and p T > 20 GeV. The possibility of cut on p ν T and/or p W T is obviously excluded for LHCb.…”

Section: Pdf Uncertaintiesmentioning

confidence: 99%

Prospects for improving the LHC W boson mass measurement with forward muons

et al. 2015

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Measurements of the W boson mass are planned by the ATLAS and CMS experiments, but for the time being, these may be unable to compete with the current world average precision of 15 MeV, due to uncertainties in the PDFs. We discuss the potential of a measurement by the LHCb experiment based on the charged lepton transverse momentum spectrum in decays. The unique forward acceptance of LHCb means that the PDF uncertainties would be anti-correlated with those of based measurements by ATLAS and CMS. We compute an average of ATLAS, CMS and LHCb measurements of from the distribution. Considering PDF uncertainties, this average is a factor of 1.3 more precise than an average of ATLAS and CMS alone. Despite the relatively low rate of W production in LHCb, we estimate that with the Run-II dataset, a measurement could be performed with sufficient experimental precision to exploit this anti-correlation in PDF uncertainties. The modelling of the lepton-pair transverse momentum distribution in the neutral current Drell–Yan process could be a limiting factor of this measurement and will deserve further studies.

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The m W − m Z interdependence in the Standard Model: a new scrutiny

Cited by 45 publications

References 56 publications

Putting standard model EFT fits to work

Putting standard model EFT fits to work

Through precision straits to next standard model heights

Prospects for improving the LHC W boson mass measurement with forward muons

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