scholarly journals Exploring color-octet scalar parameter space in minimal R-symmetric models

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Linda M. Carpenter ◽  
Taylor Murphy ◽  
Matthew J. Smylie
Keyword(s):  
Large Hadron Collider ◽  
Parameter Space ◽  
Branching Fractions ◽  
Hadron Collider ◽  
Collider Phenomenology ◽  
Decay Channels ◽  
Color Octet ◽  
Supersymmetric Models ◽  
Three Body ◽  
Displaced Vertex

Abstract In this work we study the collider phenomenology of color-octet scalars (sgluons) in minimal supersymmetric models endowed with a global continuous R symmetry. We systematically catalog the significant decay channels of scalar and pseudoscalar sgluons and identify novel features that are natural in these models. These include decays in nonstandard diboson channels, such as to a gluon and a photon; three-body decays with considerable branching fractions; and long-lived particles with displaced vertex signatures. We also discuss the single and pair production of these particles and show that they can evade existing constraints from the Large Hadron Collider, to varying extents, in large regions of reasonable parameter space. We find, for instance, that a 725 GeV scalar and a 350 GeV or lighter pseudoscalar can still be accommodated in realistic scenarios.

scholarly journals Color-octet scalars in Dirac gaugino models with broken R symmetry

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Linda M. Carpenter ◽  
Taylor Murphy
Keyword(s):  
Large Hadron Collider ◽  
Symmetry Breaking ◽  
Supersymmetry Breaking ◽  
Cross Sections ◽  
Hadron Collider ◽  
Scalar Particle ◽  
Decay Rates ◽  
Collider Phenomenology ◽  
Color Octet ◽  
Supersymmetric Models

Abstract In this work we study the collider phenomenology of color-octet scalars (sgluons) in supersymmetric models with Dirac gaugino masses that feature an explicitly broken R symmetry (R-broken models). We construct such models by augmenting minimal R-symmetric models with a fairly general set of supersymmetric and softly supersymmetry-breaking operators that explicitly break R symmetry. We then compute the rates of all significant two-body decays and highlight new features that appear as a result of R symmetry breaking, including enhancements to extant decay rates, novel tree- and loop-level decays, and improved cross sections of single sgluon production. We demonstrate in some detail how the familiar results from minimal R-symmetric models can be obtained by restoring R symmetry. In parallel to this discussion, we explore constraints on these models from the Large Hadron Collider. We find that, in general, R symmetry breaking quantitatively affects existing limits on color-octet scalars, perhaps closing loopholes for light CP-odd (pseudoscalar) sgluons while opening one for a light CP-even (scalar) particle. Qualitatively, however, we find that — much as for minimal R-symmetric models, despite stark differences in phenomenology — scenarios with broken R symmetry and two sgluons below the TeV scale can be accommodated by existing searches.

scholarly journals Probing color octet couplings at the Large Hadron Collider

2012 ◽  
Vol 86 (5) ◽  
Author(s):  
Anupama Atre ◽  
R. Sekhar Chivukula ◽  
Pawin Ittisamai ◽  
Elizabeth H. Simmons ◽  
Jiang-Hao Yu
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Color Octet

Study of Υ(nS) → Bcρ and BcK∗ decays within the QCD factorization

2016 ◽  
Vol 31 (38) ◽  
pp. 1650209
Author(s):  
Qin Chang ◽  
Yunyun Zhang ◽  
Lin Han
Keyword(s):  
Large Hadron Collider ◽  
Quantum Chromodynamics ◽  
Branching Fractions ◽  
Hadron Collider ◽  
Heavy Flavor ◽  
Leading Order ◽  
Text Data ◽  
Weak Decays ◽  
Qcd Factorization ◽  
Belle Ii

Motivated by the heavy-flavor experiments at running Large Hadron Collider (LHC) and upgrading SuperKEKB, which provide abundant [Formula: see text] data samples, the tree-dominated [Formula: see text] and [Formula: see text] (n =1, 2, 3) weak decays are studied within the framework of quantum chromodynamics (QCD) factorization. The QCD corrections to the longitudinal and transverse amplitudes are evaluated at next-to-leading order, and the branching fractions and polarization fractions are predicted. Numerically, the [Formula: see text] decays have relatively large branching fractions at the order of [Formula: see text] and are in the scope of the LHC and SuperKEKB/Belle-II experiments.

scholarly journals MASSIVE METASTABLE CHARGED (S)PARTICLES AT THE LHC

2009 ◽  
Vol 24 (25) ◽  
pp. 1955-1969 ◽  
Author(s):  
ARE R. RAKLEV
Keyword(s):  
Charged Particle ◽  
Large Hadron Collider ◽  
Hadron Collider ◽  
Recent Interest ◽  
Supersymmetric Models ◽  
Review Current

This brief review deals with recent interest in the prospects of observing a Massive Metastable Charged Particle (MMCP) at the Large Hadron Collider (LHC), and measuring its properties there. We discuss the motivation for scenarios with MMCPs in a phenomenological context, focusing on supersymmetric models that allow us to explore the expected experimental signatures of MMCPs at the LHC. We review current bounds and give estimates of the LHC reach in terms of MMCP masses.

scholarly journals Large hadron collider constraints on some simple $$Z^\prime $$ models for $$b\rightarrow s \mu ^+\mu ^-$$ anomalies

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
B. C. Allanach ◽  
J. M. Butterworth ◽  
Tyler Corbett
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Parameter Space ◽  
Hadron Collider ◽  
Baryon Number ◽  
Lepton Number ◽  
High Mass ◽  
The Third ◽  
Model Fits

AbstractWe examine current Large Hadron Collider constraints on some simple $$Z^\prime $$ Z ′ models that significantly improve on Standard Model fits to $$b\rightarrow s \mu ^+\mu ^-$$ b → s μ + μ - transition data. The models that we consider are the ‘third family baryon number minus second family lepton number’ ($${B_3-L_2}$$ B 3 - L 2 ) model and the ‘third family hypercharge’ model and variants. The constraints are applied on parameter regions of each model that fit the $$b\rightarrow s \mu ^+\mu ^-$$ b → s μ + μ - transition data and come from high-mass Drell–Yan di-muons and measurements of Standard Model processes. This latter set of observables place particularly strong bounds upon the parameter space of the $${B_3-L_2}$$ B 3 - L 2 model when the mass of the $$Z^\prime $$ Z ′ boson is less than 300 GeV.

scholarly journals Distinguishing color-octet and color-singlet resonances at the Large Hadron Collider

2013 ◽  
Vol 88 (5) ◽  
Author(s):  
Anupama Atre ◽  
R. Sekhar Chivukula ◽  
Pawin Ittisamai ◽  
Elizabeth H. Simmons
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Color Singlet ◽  
Color Octet

scholarly journals Chargino and neutralino production at the Large Hadron Collider in left-right supersymmetric models

2013 ◽  
Vol 2013 (10) ◽  
Author(s):  
Adam Alloul ◽  
Mariana Frank ◽  
Benjamin Fuks ◽  
Michel Rausch de Traubenberg
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Supersymmetric Models

scholarly journals Probing neutrino oscillations in supersymmetric models at the Large Hadron Collider

2010 ◽  
Vol 82 (7) ◽  
Author(s):  
F. de Campos ◽  
O. J. P. Éboli ◽  
M. Hirsch ◽  
M. B. Magro ◽  
W. Porod ◽  
...  
Keyword(s):  
Large Hadron Collider ◽  
Neutrino Oscillations ◽  
Hadron Collider ◽  
Supersymmetric Models
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