Extended scalar sectors, effective operators and observed data

Dey, Atri; Lahiri, Jayita; Mukhopadhyaya, Biswarup

doi:10.1007/jhep11(2018)127

Cited by 4 publications

(5 citation statements)

References 59 publications

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“…Another topic of interest was 'non-universal' SUSY models [292,[300][301][302][303][304][305], in addition to a collection of more purely phenomenological investigations [306][307][308][309][310][311][312][313][314][315][316][317][318], as the focus of the subject shifted away from UV-complete model building to the study of low-energy mass spectra. This inevitably has led to multiple studies of dark matter in the SUSY context [163,288,297,299,[319][320][321][322][323][324][325][326][327]. In addition, many other ramifications of SUSY models in the LHC context have also been discussed over the years by Choudhury [328][329][330][331][332], Sridhar [162,[333][334][335], Raychaudhuri [336][337][338]…”

Section: Seeking Supersymmetrymentioning

confidence: 99%

“…3. In addition, a doubly charged Higgs boson, such as arises whenever there is a scalar triplet or bidoublet in the model, has received considerable attention [327,[827][828][829][830][831][832][833][834] in the Indian community.…”

Section: Minimal Extensionsmentioning

confidence: 99%

“…Inevitably, such searches have led to the use of machine learning tools to sift and find patterns in the data. This field has been attracting an increasing amount of interest from India [327,[872][873][874][875][876] in recent times and holds out the promise of being a major tool in the future runs of the LHC.…”

Section: New Variables For Bsm Studiesmentioning

confidence: 99%

“…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%

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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: Seeking Supersymmetrymentioning

confidence: 99%

Section: Minimal Extensionsmentioning

confidence: 99%

Section: New Variables For Bsm Studiesmentioning

confidence: 99%

Section: Effective Field Theoriesmentioning

confidence: 99%

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Indian contributions to LHC theory

Raychaudhuri

2023

Eur. Phys. J. Spec. Top.

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“…The h → γγ decay with doubly charged scalars has been studied in Refs. [48,58,[90][91][92][93][94][95][96], and was newly implemented in H-COUP. The lower part of the plot (∆R hγ < 2) is qualitatively similar to Fig.…”

Section: A Loop Calculations By Using the H-coup Programmentioning

confidence: 99%

Single Higgs production in association with a photon at electron-positron colliders in extended Higgs models

2019

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We study associated Higgs production with a photon at electron-positron colliders, e + e − → hγ, in various extended Higgs models, such as the inert doublet model (IDM), the inert triplet model (ITM) and the two Higgs doublet model (THDM). The cross section in the standard model (SM) is maximal around √ s = 250 GeV, and we present how and how much the new physics can enhance or reduce the production rate. We also discuss the correlation with the h → γγ and h → Zγ decay rates. We find that, with a sizable coupling to a SMlike Higgs boson, charged scalars can give considerable contributions to both the production and the decay if their masses are around 100 GeV. Under the theoretical constraints from vacuum stability and perturbative unitarity as well as the current constraints from the Higgs measurements at the LHC, the production rate can be enhanced from the SM prediction at most by a factor of two in the IDM. In the ITM, in addition, we find a particular parameter region where the hγ production significantly increases by a factor of about six to eight, but the h → γγ decay still remains as in the SM. In the THDM, possible deviations from the SM prediction are minor in the viable parameter space.

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