Longitudinal 
W
 boson scattering in a light scalar top scenario

Abstract The study of Higgs boson production at large transverse momentum is one of the new frontiers for the LHC Higgs physics programme. This paper considers boosted Higgs production in the Standard Model Effective Field Theory (SMEFT). We focus on the gluon fusion and t$$ \overline{t} $$ t ¯ H production processes and study the effects of three dimension-6 operators: the top Yukawa operator, the gluon-Higgs effective coupling and the chromomagnetic dipole operator of the top quark. We perform a detailed study of the sensitivity of current and future LHC data to the corresponding Wilson coefficients, consistently accounting for their renormalisation group evolution. We compare the sensitivities obtained with only linear and linear + quadratic terms in the SMEFT by using the spectrum shape and the addition of the Higgs signal yields. We also consider fits of pT spectra in models with heavy-top partners and in MSSM scenarios with a light scalar top and study the validity of the SMEFT assumptions as a function of the new-particle masses and the Higgs pT range. Finally, we extract constraints on the Wilson coefficients for gluon fusion from a simultaneous fit to the ATLAS and CMS data and compare our results with those obtained in global SMEFT analyses.

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SCALAR TOP PRODUCTION VIA BOSON-GLUON FUSION AT HERA

Modern Physics Letters A ◽

10.1142/s0217732392003682 ◽

1992 ◽

Vol 07 (14) ◽

pp. 1209-1218 ◽

Cited By ~ 3

Author(s):

TETSURO KOBAYASHI ◽

TADASHI KON ◽

KEIICHIRO NAKAMURA ◽

TAKESHI SUZUKI

Keyword(s):

Total Cross Section ◽

Cross Section ◽

Top Quark ◽

Gluon Fusion ◽

Top Quarks ◽

Tree Level ◽

Mixing Angle ◽

Light Scalar ◽

Scalar Top ◽

Level Calculation

We investigate the production of the light scalar top quark [Formula: see text] via boson-gluon fusion at ep collider HERA, based on the minimal supersymmetric standard model. The cross-section is obtained by both an exact tree level calculation and the Weizsäcker-Williams approximation. It is shown that the total cross-section is larger than 0.1pb if [Formula: see text] and does not depend on the mixing angle θt of scalar top quarks. This enables us to search a possible region of parameters for existence of light scalar top at HERA in a wider parameter space [Formula: see text] than LEP.

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Very light scalar top quarks at the LHC

Physical Review D ◽

10.1103/physrevd.87.095016 ◽

2013 ◽

Vol 87 (9) ◽

Cited By ~ 17

Author(s):

Karol Krizka ◽

Abhishek Kumar ◽

David E. Morrissey

Keyword(s):

Top Quarks ◽

Light Scalar ◽

Scalar Top ◽

Scalar Top Quarks

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Light scalar top quarks and supersymmetric dark matter

Physical Review D ◽

10.1103/physrevd.62.035012 ◽

2000 ◽

Vol 62 (3) ◽

Cited By ~ 180

Author(s):

Céline Boehm ◽

Abdelhak Djouadi ◽

Manuel Drees

Keyword(s):

Dark Matter ◽

Top Quarks ◽

Light Scalar ◽

Scalar Top ◽

Scalar Top Quarks

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THE LIGHT SCALAR BOTTOM QUARK AND c→uγ DECAY

Modern Physics Letters A ◽

10.1142/s0217732300002887 ◽

2000 ◽

Vol 15 (38n39) ◽

pp. 2345-2357 ◽

Cited By ~ 1

Author(s):

M. BOZ ◽

Z. KIRCA

Keyword(s):

Decay Rate ◽

W Boson ◽

Bottom Quark ◽

Mass Matrices ◽

Charged Higgs ◽

Two Generations ◽

Light Scalar ◽

Near Future

In this work, we analyze c→uγ decay in supersymmetry for a light sbottom with heavy scalar fermions of the first two generations. Assuming that all generation changing entries of the sfermion mass matrices vanish and, thus considering only chargino, charged Higgs and W-boson contributions only, we calculate the Wilson coefficients and the decay rate at μ=mc level. It is found that, for low tan β regime the decay rate is enhanced up to 5% with respect to the SM. The results presented here are expected to be checked in the CHORUS experiment in the near future.

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