scholarly journals On mass limits for scalar color octet from the LHC data on the $t\bar{t}t\bar{t}$ and $tb\overline{tb}$ production.

2020 ◽  
Vol 1690 ◽  
pp. 012076
Author(s):  
M V Martynov ◽  
A D Smirnov
Keyword(s):  
Color Octet

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 ηQ Meson Photoproduction in Ultrarelativistic Heavy Ion Collisions

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Gong-Ming Yu ◽  
Gao-Gao Zhao ◽  
Zhen Bai ◽  
Yan-Bing Cai ◽  
Hai-Tao Yang ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Quarkonium ◽  
Color Singlet ◽  
Initial State ◽  
Color Octet ◽  
Ion Collisions ◽  
The Matrix

The transverse momentum distributions for inclusive ηc,b meson described by gluon-gluon interactions from photoproduction processes in relativistic heavy ion collisions are calculated. We considered the color-singlet (CS) and color-octet (CO) components within the framework of Nonrelativistic Quantum Chromodynamics (NRQCD) in the production of heavy quarkonium. The phenomenological values of the matrix elements for the color-singlet and color-octet components give the main contribution to the production of heavy quarkonium from the gluon-gluon interaction caused by the emission of additional gluon in the initial state. The numerical results indicate that the contribution of photoproduction processes cannot be negligible for midrapidity in p-p and Pb-Pb collisions at the Large Hadron Collider (LHC) energies.

scholarly journals Color octet contribution toJ/ψphotoproduction asymmetries

2000 ◽  
Vol 62 (3) ◽  
Author(s):  
G. Japaridze ◽  
W.-D. Nowak ◽  
A. Tkabladze
Keyword(s):  
Color Octet

scholarly journals $$ t\overline{t}t\overline{t} $$ signatures through the lens of color-octet scalars

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Linda M. Carpenter ◽  
Taylor Murphy ◽  
Matthew J. Smylie
Keyword(s):  
Cross Section ◽  
Transverse Energy ◽  
Production Cross ◽  
Top Quarks ◽  
Atlas Collaboration ◽  
Missing Transverse Energy ◽  
Color Octet ◽  
Section Measurement ◽  
Discovery Potential ◽  
New Phenomena

Abstract We reinterpret two recent LHC searches for events containing four top quarks $$ \left(t\overline{t}t\overline{t}\right) $$ t t ¯ t t ¯ in the context of supersymmetric models with Dirac gauginos and color-octet scalars (sgluons). We explore whether sgluon contributions to the four-top production cross section $$ \sigma \left( pp\to t\overline{t}t\overline{t}\right) $$ σ pp → t t ¯ t t ¯ can accommodate an excess of four-top events recently reported by the ATLAS collaboration. We also study constraints on these models from an ATLAS search for new phenomena with high jet multiplicity and significant missing transverse energy $$ \left({E}_{\mathrm{T}}^{\mathrm{miss}}\right) $$ E T miss sensitive to signals with four top quarks. We find that these two analyses provide complementary constraints, with the jets + $$ {E}_{\mathrm{T}}^{\mathrm{miss}} $$ E T miss search exceeding the four-top cross section measurement in sensitivity for sgluons heavier than about 800 GeV. We ultimately find that either a scalar or a pseudoscalar sgluon can currently fit the ATLAS excess in a range of reasonable benchmark scenarios, though a pseudoscalar in minimal Dirac gaugino models is ruled out. We finally offer sensitivity projections for these analyses at the HL-LHC, mapping the 5σ discovery potential in sgluon parameter space and computing exclusion limits at 95% CL in scenarios where no excess is found.

scholarly journals Color-octet quarkonium production at the Z pole

1995 ◽  
Author(s):  
K. Cheung ◽  
W.Y. Keung ◽  
T.C. Yuan
Keyword(s):  
Color Octet ◽  
Quarkonium Production

The contribution of color-octet current color-octet current toD decays

1989 ◽  
Vol 42 (1) ◽  
pp. 99-105 ◽  
Author(s):  
Xue Qian Li ◽  
Tao Huang ◽  
Zhiqing Zhang
Keyword(s):  
Color Octet

scholarly journals ψ′polarization due to color-octet quarkonia production

1997 ◽  
Vol 56 (7) ◽  
pp. 4412-4415 ◽  
Author(s):  
Adam K. Leibovich
Keyword(s):  
Color Octet

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

scholarly journals Quarkonium Production at Z0 and in ϒ(1S) Decay

1997 ◽  
Vol 12 (22) ◽  
pp. 3931-3940
Author(s):  
Kingman Cheung ◽  
Wai-Yee Keung ◽  
Tzu Chiang Yuan
Keyword(s):  
Color Singlet ◽  
Fixed Target ◽  
Production Rates ◽  
Fixed Target Experiments ◽  
Color Octet ◽  
Quarkonium Production ◽  
Color Octet Mechanism

The conventional color-singlet model was challenged by the recent data on quarkonium production. Discrepancies in production rates were observed at the Tevatron, at LEP, and in fixed-target experiments. The newly advocated color-octet mechanism provides a plausible solution to the anomalous quarkonium production observed at the Tevatron. The color-octet mechanism should also affect other quarkonium production channels. In this paper we will summarize the studies of quarkonium production in Z0 and ϒ decays.

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