scholarly journals J/ψ production at \sqrt{s}=1.96 and 7 TeV: colour-singlet model, NNLO⋆and polarization

2011 ◽  
Vol 38 (12) ◽  
pp. 124110 ◽  
Author(s):  
J P Lansberg
Keyword(s):  
Colour Singlet

scholarly journals Compact Exotic Tetraquark Mesons in Large-Nc QCD

2018 ◽  
Vol 191 ◽  
pp. 04003
Author(s):  
Wolfgang Lucha ◽  
Dmitri Melikhov ◽  
Hagop Sazdjian
Keyword(s):  
Scattering Amplitudes ◽  
Quantum Chromodynamics ◽  
Internal Consistency ◽  
Selection Criteria ◽  
Bound States ◽  
Degrees Of Freedom ◽  
Decay Rates ◽  
Meson Decay ◽  
Decay Channels ◽  
Colour Singlet

We embark on systematic explorations of the behaviour of tetraquark mesons, i.e., colour-singlet bound states of two quarks and two antiquarks, in the (idealized) limit of a large number of colour degrees of freedom, Nc,; of quantum chromodynamics, QCD. Considering the scattering of two ordinary mesons into two ordinary mesons, we start off with formulating a set of selection criteria that should enable us to unambiguously single out precisely those contributions to all encountered scattering amplitudes that potentially will develop tetraquark poles. Assuming that tetraquark mesons do exist and, if so, emerge in the contributions compatible with our criteria at largest admissible order of Nc; we deduce, for the categories of tetraquarks that exhibit either four or only two different open quark flavours, that the decay rates of these tetraquark types are, at least, of order 1/N2c and that internal consistency requires all the members of the first species to exist pairwise, distinguishable by their favoured two-ordinary-meson decay channels.

scholarly journals Hard colour singlet exchange and gaps between jets at the Tevatron

2002 ◽  
Vol 524 (3-4) ◽  
pp. 273-282 ◽  
Author(s):  
R. Enberg ◽  
G. Ingelman ◽  
L. Motyka
Keyword(s):  
Colour Singlet

scholarly journals Contribution of colour-singlet process to ϒ→J/Ψ+X

2000 ◽  
Vol 482 (1-3) ◽  
pp. 65-70 ◽  
Author(s):  
Shi-yuan Li ◽  
Qu-bing Xie ◽  
Qun Wang
Keyword(s):  
Colour Singlet

scholarly journals Transverse Momentum Dependence in Double Parton Scattering

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Jonathan R. Gaunt ◽  
Tomas Kasemets
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Momentum Dependence ◽  
Transverse Momentum Dependence ◽  
Double Parton Scattering ◽  
Colour Singlet ◽  
The Status ◽  
The Cross ◽  
Parton Scattering ◽  
Near Future

In this review, we describe the status of transverse momentum dependence (TMD) in double parton scattering (DPS). The different regions of TMD DPS are discussed, and expressions are given for the DPS cross section contributions that make use of as much perturbative information as possible. The regions are then combined with each other as well as single parton scattering to obtain a complete expression for the cross section. Particular emphasis is put on the differences and similarities to transverse momentum dependence in single parton scattering. We further discuss the status of the factorisation proof for double colour singlet production in DPS, which is now on a similar footing to the proofs for TMD factorisation in single Drell-Yan, discuss parton correlations, and give an outlook on possible research on DPS in the near future.

scholarly journals COLOUR SUPERCONDUCTIVITY IN FINITE SYSTEMS

2003 ◽  
Vol 17 (28) ◽  
pp. 5185-5189
Author(s):  
P. AMORE ◽  
M. C. BIRSE ◽  
J. A. MCGOVERN ◽  
N. R. WALET
Keyword(s):  
Superconducting State ◽  
Singlet State ◽  
Finite Size ◽  
Baryon Number ◽  
The State ◽  
Finite Systems ◽  
Colour Singlet ◽  
Group Manifold ◽  
Colour Group

We have studied the effects of finite size on the two flavor colour superconducting state. Since the baryon number in the BCS state is only fixed on average, we have projected the state over a fixed baryon number. The resulting state has been then projected over a colour-singlet state, by integrating over the colour group manifold. The effects of both projections have been evaluated numerically.

Colour singlet ensemble

1984 ◽  
Vol 10 (4) ◽  
pp. 439-445 ◽  
Author(s):  
R Anishetty
Keyword(s):  
Colour Singlet
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