A fully differential SMEFT analysis of the golden channel using the method of moments

Banerjee, Shankha; Gupta, Rick S.; Ochoa-Valeriano, Oscar; Spannowsky, Michael; Venturini, Elena

doi:10.1007/jhep06(2021)031

Cited by 14 publications

(5 citation statements)

References 97 publications

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“…Moreover, for a particular set of processes, the dominant contributions may come from a limited set of operators, leading to an EFT version of simplified models. Many of these aspects have been investigated by Indian physicists [884][885][886][887][888][889][890][891][892][893][894][895][896][897][898][899], though much remains to be done, as this is an active, ongoing line of research.…”

Section: Effective Field Theoriesmentioning

confidence: 99%

Indian contributions to LHC theory

Raychaudhuri

2023

Eur. Phys. J. Spec. Top.

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Indian scientists began to work on the theoretical aspects of LHC physics from the early 1980s, at the same time when the rest of the world started taking interest in this then-futuristic topic. From this point grew a whole school of collider phenomenologists, who now form a significant fraction of the Indian high-energy physics community. This article briefly reviews the growth and contributions of the Indian school, on the way describing some of the physics ideas while placing the work in the international context, and proceeding thus, brings the story up to date in mid-2022.Dedicated to the memory of the late D.P. Roy (1941Roy ( -2017, the father of Indian collider theory. The expectant 80sThe LHC owes its origin [1] to CERN's far-sighted leaders, Léon van Hove, who served from 1976-1980 as the Scientific Director-General, and Technical Director-General Sir John Adams (1976)(1977)(1978)(1979)(1980)(1981), who resolved that it would be feasible and scientifically rewarding to build the next-generation storage ring at CERN. Thus, in 1977, Adams wrote the crucial concept note that the LEP collider 1 tunnel, which would be excavated in the 1980s, should be made large enough to accommodate the superconducting magnets required for a future phase of proton acceleration at higher energies. This 1977 note may be thought of as the genesis of the LHC. By 1978, it was already well known in the community, even though the formal approval for the LEP came only in 1981, and the machine itself started running in 1989 [2]. However, the fact that the 20 TeV LHC would eventually come and that the physics at such a machine should be studied, was in the air right from the early 1980s onward. Moreover, the USA was supposed to build a 40 TeV Superconducting Super Collider (SSC) which, sadly, never materialised 2 . The 1980s were, in fact, a period of great optimism for high-energy physics -or, as it was then more commonly known, elementary particle physics. One trigger for this may have lain in the decision of the Nobel Prize committee, in 1979, to recognise the work of Glashow (1961) [3], of Salam (1966-1968 1 The Large Electron-Positron collider.2 It was sanctioned in 1989, and eventually cancelled in 1993.

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Section: Effective Field Theoriesmentioning

confidence: 99%

Indian contributions to LHC theory

Raychaudhuri

2023

Eur. Phys. J. Spec. Top.

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“…We note that an analogous method of moments has previously been considered in the context of measuring dim-6 SMEFT contributions in Electroweak Higgs production and decay [87,88].…”

Section: Jhep10(2022)107mentioning

confidence: 99%

Moments for positivity: using Drell-Yan data to test positivity bounds and reverse-engineer new physics

Mimasu

Yamashita

et al. 2022

J. High Energ. Phys.

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Moments of the leptonic angular distribution in the Drell-Yan process have recently been shown to be sensitive probes of a specific class of dimension-8, four-fermion operators in the Standard Model Effective Field Theory, involving a pair of quarks and leptons. The same operators are also subject to positivity bounds, when requiring the associated (unknown) UV completion to obey basic principles of quantum field theory. We perform a phenomenological study to quantify the sensitivity of the high-luminosity LHC to this set of operators and, by extension, the positivity bounds. We further extend the angular basis of moments and consider double differential information to improve the ability to disentangle the different operators, leading to a sensitivity to new physics scales up to 3 TeV. We use this information to explore the violation of positivity at the LHC as a way to test the underlying principles of quantum field theory. Finally, we present a case study which combines our results with information from other (current and prospective) experiments, as well as the positivity cone to infer the properties of possible tree-level UV completions. The data lead to robust, model-independent lower bounds on the $$ M/\sqrt{g} $$ M / g combination of the particle mass and coupling, for states that couple to right-handed leptons and/or up quarks.

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“…We note that an analogous method of moments has previously been considered in the context of measuring dim-6 SMEFT contributions in Electroweak Higgs production and decay [83,84]. 1 In practice, it is not possible to extract the coefficients in this exact way at collider experiments.…”

Section: Effective Operatorsmentioning

confidence: 99%

Moments for positivity: using Drell-Yan data to test positivity bounds and reverse-engineer new physics

Li¹,

Mimasu²,

Yamashita³

et al. 2022

Preprint

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Moments of the leptonic angular distribution in the Drell-Yan process have recently been shown to be sensitive probes of a specific class of dimension-8, four-fermion operators in the Standard Model Effective Field Theory, involving a pair of quarks and leptons. The same operators are also subject to positivity bounds, when requiring the associated (unknown) UV completion to obey basic principles of quantum field theory. We perform a phenomenological study to quantify the sensitivity of the high-luminosity LHC to this set of operators and, by extension, the positivity bounds. We further extend the angular basis of moments and consider double differential information to improve the ability to disentangle the different operators, leading to a sensitivity to new physics scales up to 3 TeV. We use this information to explore the violation of positivity at the LHC as a way to test the underlying principles of quantum field theory. Finally, we present a case study which combines our results with information from other (current and prospective) experiments, as well as the positivity cone to infer the properties of possible tree-level UV completions. The data lead to robust, model-independent lower bounds on the M/ √ g combination of the particle mass and coupling, for states that couple to right-handed leptons and/or up quarks.

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A fully differential SMEFT analysis of the golden channel using the method of moments

Cited by 14 publications

References 97 publications

Indian contributions to LHC theory

Indian contributions to LHC theory

Moments for positivity: using Drell-Yan data to test positivity bounds and reverse-engineer new physics

Moments for positivity: using Drell-Yan data to test positivity bounds and reverse-engineer new physics

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