Light scalar top quark ate+e−colliders

1987 ◽  
Vol 36 (3) ◽  
pp. 724-732 ◽  
Author(s):  
Ken-ichi Hikasa ◽  
Makoto Kobayashi
Keyword(s):  
Top Quark ◽  
Light Scalar ◽  
Scalar Top

scholarly journals Sensitivity to BSM effects in the Higgs pT spectrum within SMEFT

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Marco Battaglia ◽  
Massimiliano Grazzini ◽  
Michael Spira ◽  
Marius Wiesemann
Keyword(s):  
Top Quark ◽  
Gluon Fusion ◽  
Effective Field ◽  
Three Dimension ◽  
Linear Quadratic ◽  
Effective Coupling ◽  
Dipole Operator ◽  
The Standard Model ◽  
Light Scalar ◽  
Scalar Top

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.

SCALAR TOP PRODUCTION VIA BOSON-GLUON FUSION AT HERA

1992 ◽  
Vol 07 (14) ◽  
pp. 1209-1218 ◽  
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.

scholarly journals Search for scalar top quark production in $ p\bar{p} $ collisions at $ \sqrt{s}=1.96\;\mathrm{TeV} $

2012 ◽  
Vol 2012 (10) ◽  
Author(s):  
T. Aaltonen ◽  
◽  
B. Álvarez González ◽  
S. Amerio ◽  
D. Amidei ◽  
...  
Keyword(s):  
Top Quark ◽  
Top Quark Production ◽  
Quark Production ◽  
Scalar Top

scholarly journals Signals for scalar top quark atep collider HERA

1994 ◽  
Vol 61 (2) ◽  
pp. 239-246 ◽  
Author(s):  
Tadashi Kon ◽  
Tetsuro Kobayashi ◽  
Shoichi Kitamura ◽  
Keiichiro Nakamura ◽  
Shunji Adachi
Keyword(s):  
Top Quark ◽  
Scalar Top

scholarly journals Search for the Scalar Top Quark inpp¯Collisions ats=1.8TeV

2002 ◽  
Vol 88 (17) ◽  
Author(s):  
V. M. Abazov ◽  
B. Abbott ◽  
A. Abdesselam ◽  
M. Abolins ◽  
V. Abramov ◽  
...  
Keyword(s):  
Top Quark ◽  
Scalar Top

scholarly journals Scalar top quark production at

1998 ◽  
Author(s):  
A. Bartl ◽  
H. Eberl ◽  
S. Kraml ◽  
W. Majerotto ◽  
W. Porod
Keyword(s):  
Top Quark ◽  
Top Quark Production ◽  
Quark Production ◽  
Scalar Top

scholarly journals Search for Pair Production of Light Scalar Top Quarks inpp¯Collisions ats=1.8  TeV

2004 ◽  
Vol 93 (1) ◽  
Author(s):  
V. M. Abazov ◽  
B. Abbott ◽  
A. Abdesselam ◽  
M. Abolins ◽  
V. Abramov ◽  
...  
Keyword(s):  
Pair Production ◽  
Top Quarks ◽  
Light Scalar ◽  
Scalar Top ◽  
Scalar Top Quarks
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