Constraining compressed versions of MUED and MSSM using soft tracks at the LHC

Chakraborty, Sabyasachi; Niyogi, Saurabh; Sridhar, K.

doi:10.1007/jhep07(2017)105

Cited by 11 publications

(9 citation statements)

References 140 publications

(160 reference statements)

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“…At this stage it is needed to mention that the value of lower limits on R −1 from the analysis on B = 2 transitions for minimal version of UED scenario, have already been excluded by the LHC data. Since the recent analyses including LHC data have ruled out R −1 up to 1.4 TeV [87][88][89][90].…”

Section: Resultsmentioning

confidence: 99%

The impact of nonminimal universal extra dimensional model on $$\Delta B=2$$ transitions

Shaw

2021

Eur. Phys. J. C

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We measure the impact of nonvanishing boundary localised terms on $$\Delta B=2$$ Δ B = 2 transitions in five-dimensional Universal Extra Dimensional scenario where masses and coupling strengths of several interactions of Kaluza–Klein modes are significantly modified with respect to the minimal counterpart. In such scenario we estimate the Kaluza–Klein contributions of quarks, gauge bosons and charged Higgs by evaluating the one-loop box diagrams that are responsible for the $$\Delta B=2$$ Δ B = 2 transitions. Using the loop function (obtained from one-loop box diagrams) we determine several important elements that are involved in Wolfenstein parametrisation. Moreover, with these elements we also study the geometrical shape of unitarity triangle. Besides, we compute the quantity $$\Delta M_s$$ Δ M s scaled by the corresponding Standard Model value. Outcomes of our theoretical predictions have been compared to the allowed ranges of the corresponding observables simultaneously. Our current analysis shows that, depending on the parameters in this scenario the lower limit on the inverse of the radius of compactification can reach to an appreciable large value ($$\approx 1.48$$ ≈ 1.48 TeV or even higher).

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Section: Resultsmentioning

confidence: 99%

The impact of nonminimal universal extra dimensional model on $$\Delta B=2$$ transitions

Shaw

2021

Eur. Phys. J. C

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“…In the minimal version of this model (mUED) upper bound on the observed relic density places the scale of new physics at the TeV scale [5,6] implying encouraging prognosis of being explored at collider experiments. Interestingly, the collider phenomenology [7][8][9][10] of these models closely mimics supersymmetric extension of the SM with a relatively compressed spectrum [11].…”

Section: Introductionmentioning

confidence: 81%

Status of a flavor-maximal nonminimal universal extra dimension model

et al. 2018

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In this paper we consider an S 1 /Z 2 compactified flat extra dimensional scenario where all the standard model states can access the bulk and have generalised brane localised kinetic terms. The flavour structure of brane kinetic terms for the standard model fermions are dictated by stringent flavour bounds on the first two generations implying an U (2) Q L ⊗U (2) u R ⊗U (2) d R flavour symmetry. We consider the constraints on such a scenario arising from dark matter relic density and direct detection measurements, precision electroweak data, Higgs physics and LHC dilepton searches. We discuss the possibility of such a scenario providing an explanation of the recently measured anomaly in R K ( * ) within the allowed region of the parameter space.

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“…However, the squarks and left handed sleptons can easily been taken heavier without ruining the main features of GSS, namely the near degeneracy of the right handed sleptons with the LSP. Compressed spectra, especially among weakly interacting states, are hard to probe at the LHC, though studies with displaced vertices [117,118], soft-tracks [119,120], or initial state radiation [121][122][123][124][125] can be a useful tool to look for such regions. Should a compressed slepton-LSP sector be discovered at the LHC, the next step towards singling out GSS as the underlying framework would be to verify the hierarchical structure of the spectrum, for example, a right handed slepton signal without any sign of squarks, left handed sleptons, or gauginos.…”

Section: Benchmark Pointsmentioning

confidence: 99%

Charting generalized supersoft supersymmetry

Chakraborty

Martin

Roy

2018

J. High Energ. Phys.

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Without any shred of evidence for new physics from LHC, the last hiding spots of natural electroweak supersymmetry seem to lie either in compressed spectra or in spectra where scalars are suppressed with respect to the gauginos. While in the MSSM (or in any theory where supersymmetry is broken by the F -vev of a chiral spurion), a hierarchy between scalar and gaugino masses requires special constructions, it is automatic in scenarios where supersymmetry is broken by D-vev of a real spurion. In the latter framework, gaugino mediated contributions to scalar soft masses are finite (loop suppressed but not log-enhanced), a feature often referred to as "supersoftness". Though phenomenologically attractive, pure supersoft models suffer from the µ-problem, potential color-breaking minima, large T -parameter, etc. These problems can be overcome without sacrificing the model's virtues by departing from pure supersoftness and including µ-type operators that use the same D-vev, a framework known as generalized supersoft supersymmetry. The main purpose of this paper is to point out that the new operators also solve the last remaining issue associated with supersoft spectra, namely that a right handed (RH) slepton is predicted to be the lightest superpartner, rendering the setup cosmologically unfeasible. In particular, we show that the µ-operators in generalized supersoft generate a new source for scalar masses, which can raise the RH-slepton mass above bino due to corrections from renormalisation group evolutions (RGEs). In fact, a mild tuning can open up the bino-RH slepton coannihilation regime for a thermal dark matter. We derive the full set of RGEs required to determine the spectrum at low energies. Beginning with input conditions at a high scale, we show that completely viable spectra can be achieved.

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Constraining compressed versions of MUED and MSSM using soft tracks at the LHC

Cited by 11 publications

References 140 publications

The impact of nonminimal universal extra dimensional model on $$\Delta B=2$$ transitions

The impact of nonminimal universal extra dimensional model on $$\Delta B=2$$ transitions

Status of a flavor-maximal nonminimal universal extra dimension model

Charting generalized supersoft supersymmetry

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