scholarly journals Compressed supersymmetry and natural neutralino dark matter from top squark-mediated annihilation to top quarks

2007 ◽  
Vol 75 (11) ◽  
Author(s):  
Stephen P. Martin
Keyword(s):  
Dark Matter ◽  
Top Quarks ◽  
Top Squark

scholarly journals Top squark searches using dilepton invariant mass distributions and bino-Higgsino dark matter at the LHC

2013 ◽  
Vol 87 (9) ◽  
Author(s):  
Bhaskar Dutta ◽  
Teruki Kamon ◽  
Nikolay Kolev ◽  
Kuver Sinha ◽  
Kechen Wang ◽  
...  
Keyword(s):  
Dark Matter ◽  
Invariant Mass ◽  
Top Squark ◽  
Dilepton Invariant Mass ◽  
Mass Distributions

scholarly journals Probing mild-tempered neutralino dark matter through top-squark production at the LHC

2021 ◽  
Vol 104 (5) ◽  
Author(s):  
Monoranjan Guchait ◽  
Arnab Roy ◽  
Seema Sharma
Keyword(s):  
Dark Matter ◽  
Top Squark

scholarly journals NEW LIMITS ON TOP SQUARK NLSP FROM ATLAS 4.7 fb-1 DATA

2012 ◽  
Vol 27 (32) ◽  
pp. 1250188 ◽  
Author(s):  
ARGHYA CHOUDHURY ◽  
AMITAVA DATTA
Keyword(s):  
Dark Matter ◽  
Lower Limit ◽  
New Physics ◽  
Supersymmetric Particle ◽  
Top Squark ◽  
Decay Modes ◽  
Dark Matter Relic Density ◽  
Relic Density ◽  
200 Gev ◽  
New Physics Search

Using the ATLAS 4.7 fb-1 data on new physics search in the jets + [Formula: see text] channel, we obtain new limits on the lighter top squark [Formula: see text] considering all its decay modes assuming that it is the next to lightest supersymmetric particle (NLSP). If the decay [Formula: see text] dominates and the production of dark matter relic density is due to NLSP–lightest supersymmetric particle (LSP) co-annihilation then the lower limit on [Formula: see text] is 240 GeV. The limit changes to 200 GeV if the decay [Formula: see text] dominates. Combining these results it follows that [Formula: see text] NLSP induced baryogenesis is now constrained more tightly.

scholarly journals Light scalar top quarks and supersymmetric dark matter

2000 ◽  
Vol 62 (3) ◽  
Author(s):  
Céline Boehm ◽  
Abdelhak Djouadi ◽  
Manuel Drees
Keyword(s):  
Dark Matter ◽  
Top Quarks ◽  
Light Scalar ◽  
Scalar Top ◽  
Scalar Top Quarks

scholarly journals Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in pp collisions at $$ \sqrt{\mathrm{s}} $$ = 13 TeV with the ATLAS detector

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Dark Matter ◽  
Transverse Momentum ◽  
Pair Production ◽  
Hadron Collider ◽  
Atlas Detector ◽  
Top Squark ◽  
Proton Proton ◽  
Opposite Charge ◽  
Missing Transverse Momentum ◽  
Wide Range

Abstract The results of a search for direct pair production of top squarks and for dark matter in events with two opposite-charge leptons (electrons or muons), jets and missing transverse momentum are reported, using 139 fb−1 of integrated luminosity from proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV, collected by the ATLAS detector at the Large Hadron Collider during Run 2 (2015–2018). This search considers the pair production of top squarks and is sensitive across a wide range of mass differences between the top squark and the lightest neutralino. Additionally, spin-0 mediator dark-matter models are considered, in which the mediator is produced in association with a pair of top quarks. The mediator subsequently decays to a pair of dark-matter particles. No significant excess of events is observed above the Standard Model background, and limits are set at 95% confidence level. The results exclude top squark masses up to about 1 TeV, and masses of the lightest neutralino up to about 500 GeV. Limits on dark-matter production are set for scalar (pseudoscalar) mediator masses up to about 250 (300) GeV.

scholarly journals Single top quarks and dark matter

2017 ◽  
Vol 96 (3) ◽  
Author(s):  
Deborah Pinna ◽  
Alberto Zucchetta ◽  
Matthew R. Buckley ◽  
Florencia Canelli
Keyword(s):  
Dark Matter ◽  
Top Quarks ◽  
Single Top

scholarly journals One-loop corrections to ALP couplings

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
J. Bonilla ◽  
I. Brivio ◽  
M. B. Gavela ◽  
V. Sanz
Keyword(s):  
Dark Matter ◽  
Renormalization Group ◽  
Direct Detection ◽  
Top Quarks ◽  
Order Dimension ◽  
Leading Order ◽  
Theoretical Understanding ◽  
Anomalous Couplings ◽  
The One

Abstract The plethora of increasingly precise experiments which hunt for axion-like particles (ALPs), as well as their widely different energy reach, call for the theoretical understanding of ALP couplings at loop-level. We derive the one-loop contributions to ALP-SM effective couplings, including finite corrections. The complete leading-order — dimension five — effective linear Lagrangian is considered. The ALP is left off-shell, which is of particular impact on LHC and accelerator searches of ALP couplings to γγ, ZZ, Zγ, WW, gluons and fermions. All results are obtained in the covariant Rξ gauge. A few phenomenological consequences are also explored as illustration, with flavour diagonal channels in the case of fermions: in particular, we explore constraints on the coupling of the ALP to top quarks, that can be extracted from LHC data, from astrophysical sources and from Dark Matter direct detection experiments such as PandaX, LUX and XENON1T. Furthermore, we clarify the relation between alternative ALP bases, the role of gauge anomalous couplings and their interface with chirality-conserving and chirality-flip fermion interactions, and we briefly discuss renormalization group aspects.

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