Study of di-lepton + 4 jets events in Run II of the D0 experiment at Fermilab. Interpretation in the framework of the search for supersymmetric particles with R-parity violating decay ($\lambda$ ' coupling)

2002 ◽  
Author(s):  
Auguste Besson
Keyword(s):  
Supersymmetric Particles

Supersymmetric particles at the CERN collider

1984 ◽  
Vol 246 (2) ◽  
pp. 189-202 ◽  
Author(s):  
John Ellis ◽  
H. Kowalski
Keyword(s):  
Supersymmetric Particles

scholarly journals Search for supersymmetric particles with R-parity violation in Z decays

1995 ◽  
Vol 349 (1-2) ◽  
pp. 238-252 ◽  
Author(s):  
D. Buskulic ◽  
D. Casper ◽  
I. De Bonis ◽  
D. Decamp ◽  
P. Ghez ◽  
...  
Keyword(s):  
Parity Violation ◽  
Z Decays ◽  
Supersymmetric Particles

NUMERICAL REEXAMINATION OF SUPERSYMMETRIC AND NONSUPERSYMMETRIC SU(5)-LIKE GRAND UNIFIED MODELS

1989 ◽  
Vol 04 (10) ◽  
pp. 2531-2559 ◽  
Author(s):  
DARIUSZ K. GRECH
Keyword(s):  
Numerical Analysis ◽  
Numerical Computation ◽  
Numerical Results ◽  
Yukawa Couplings ◽  
Loop Level ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Supersymmetric Particles ◽  
The Difference

The significance of numerical analysis in both nonsupersymmetric and supersymmetric Grand Unified Theories is pointed out. The exact analytical and numerical analysis we present shows a need of larger corrections to the values of unifying parameters, i.e. sin 2 θw, Mx, τp than those often quoted in literature. When an unmodified nonsupersymmetric version of SU(5) is considered we show that numerical computation allows some of the models still to be experimentally admissible. The difference between analytical and numerical results for the supersymmetric SU(5) model is also stressed. In particular, corrections due to the mass threshold of additional generations or supersymmetric particles are calculated both analytically and numerically at the two-loop level. We found them far more important for the final values of sin 2 θw, Mx and τp than the effects of Higgs-Yukawa couplings between scalars and fermions.

scholarly journals Utilizing Unsupervised Machine Learning in BSM Physics Searches At The LHC

2020 ◽  
Vol 245 ◽  
pp. 06021
Author(s):  
Adam Leinweber ◽  
Martin White
Keyword(s):  
Machine Learning ◽  
Large Hadron Collider ◽  
Hadron Collider ◽  
New Physics ◽  
Machine Learning Technique ◽  
Unsupervised Machine Learning ◽  
Learning Technique ◽  
Bsm Physics ◽  
Supersymmetric Particles ◽  
One Machine

Recent searches for supersymmetric particles at the Large Hadron Collider have been unsuccessful in detecting any BSM physics. This is partially because the exact masses of supersymmetric particles are not known, and as such, searching for them is very difficult. The method broadly used in searching for new physics requires one to optimise on the signal being searched for, potentially suppressing sensitivity to new physics which may actually be present that does not resemble the chosen signal. The problem with this approach is that, in order to detect something with this method, one must already know what to look for. I will showcase one machine-learning technique that can be used to define a “signal-agnostic” search. This is a search that does not make any assumptions about the signal being searched for, allowing it to detect a signal in a more general way. This method is applied to simulated BSM physics data and the results are explored.

scholarly journals Heavy $$Z^\prime $$ bosons in the secluded $$U(1)^\prime $$ model at hadron colliders

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
Mariana Frank ◽  
Levent Selbuz ◽  
Ismail Turan
Keyword(s):  
Experimental Data ◽  
Detailed Analysis ◽  
Prime Model ◽  
Hadron Colliders ◽  
Electroweak Scale ◽  
Relic Density ◽  
Vector Bosons ◽  
Supersymmetric Particles

AbstractWe study $$Z^{\prime }$$ Z ′ phenomenology at hadron colliders in an $$U(1)^{\prime }$$ U ( 1 ) ′ extended MSSM. We choose a $$U(1)^{\prime }$$ U ( 1 ) ′ model with a secluded sector, where the tension between the electroweak scale and developing a large enough mass for $$Z^{\prime }$$ Z ′ is resolved by incorporating three additional singlet superfields into the model. We perform a detailed analysis of the production, followed by decays, including into supersymmetric particles, of a $$Z^{\prime }$$ Z ′ boson with mass between 4 and 5.2 TeV, with particular emphasis on its possible discovery. We select three different scenarios consistent with the latest available experimental data and relic density constraints, and concentrate on final signals with $$2\ell +\not \! \! E_{T}$$ 2 ℓ + ⧸ E T , $$4\ell +\not \! \! E_{T}$$ 4 ℓ + ⧸ E T and $$6\ell +\not \! \! E_{T}$$ 6 ℓ + ⧸ E T . Including the SM background from processes with two, three or four vector bosons, we show the likelihood of observing a $$Z^\prime $$ Z ′ boson is not promising for the HL-LHC at 14 TeV. While at 27 and 100 TeV, the situation is more optimistic, and we devise specific benchmark scenarios which could be observed.

WHAT HAVE WE LEARNED FROM SN 1987A?

1990 ◽  
Vol 05 (31) ◽  
pp. 2581-2592 ◽  
Author(s):  
GEORG G. RAFFELT
Keyword(s):  
Fundamental Physics ◽  
Sn 1987A ◽  
Supersymmetric Particles

We review the constraints on the properties of neutrinos, axions, majorons, light supersymmetric particles, and other constraints on fundamental physics that have been derived on the basis of the neutrino observations of SN 1987A.

scholarly journals VIRTUAL SUPERSYMMETRIC CORRECTIONS IN e+e- ANNIHILATION

1998 ◽  
Vol 13 (24) ◽  
pp. 1987-1996 ◽  
Author(s):  
L. CLAVELLI ◽  
P. W. COULTER ◽  
LEVAN R. SURGULADZE
Keyword(s):  
Total Width ◽  
Leading Order ◽  
Squark Mass ◽  
Supersymmetric Particles

Depending on their masses, supersymmetric particles can affect various measurements in Z decay. Among these are the total width (or consequent extracted value of αs), enhancement or suppression of various flavors, and left–right and forward–backward asymmetries. The latter depend on squark mass splittings and are, therefore, a possible test of the supergravity related predictions. We calculate leading order corrections for these quantities considering in particular the case of light photino and gluino where the SUSY effects are enhanced. In this limit the effect on αs is appreciable, the effect on Rb is small, and the effect on the asymmetries is extremely small.

Sign in / Sign up

Export Citation Format

Share Document