Results 51 to 60 of about 49,128 (271)
Analysis of Radial Excitations of Octet Baryons in QCD Sum Rules
Advances in High Energy Physics, 2017 Using the QCD sum rules method, we estimate the mass and residues of the first radial excitations of octet baryons. The contributions coming from the ground state baryons are eliminated by constructing the linear combinations of the sum rules ...
T. M. Aliev, S. Bilmis
doaj +1 more source
Decuplet to octet baryon transitions in chiral perturbation theory
European Physical Journal C: Particles and Fields, 2019 We have systematically investigated the decuplet (T) to octet (B) baryon ($$T\rightarrow B\gamma $$ T→Bγ ) transition magnetic moments to the next-to-next-to-leading order and electric quadruple moments to the next-to-leading order in the framework of ...
Hao-Song Li +4 more
doaj +1 more source
Color-Octet $ψ'$ Production at Low $p_\perp$ [PDF]
Phys.Rev. D53 (1996) 4851-4856, 1995 We study contributions from color-octet quarkonium formation mechanisms to $p_\perp$-integrated $\psi'$ production cross sections in pion-nucleon reactions. The observed polarization of the $\psi'$ is not reproduced by the lowest-order leading-twist color-singlet and color-octet mechanisms.
arxiv +1 more source
Journal of High Energy Physics, 2021 We study the fragmentation function of the gluon to color-octet 3 S 1 heavy quark-antiquark pair using the soft gluon factorization (SGF) approach, which expresses the fragmentation function in a form of perturbative short-distance hard part convoluted ...
An-Ping Chen +3 more
doaj +1 more source
Gluon fragmentation to ^3D_J quarkonia [PDF]
, 1997 We present a calculation of the leading order QCD fragmentation functions for gluons to split into spin-triplet D-wave quarkonia. We apply them to evaluate the gluon fragmentation contributions to inclusive ^3D_J quarkonium production at large transverse
A. Gribushin +31 more
core +2 more sources
$ψ'$ Polarization due to Color-Octet Quarkonia Production [PDF]
Phys. Rev. D 56, 4412 (1997), 1996 We calculated the polarization of \psi' due to gg \to Q\bar{Q}[^3P_J^(8)]g \to \psi^\lambda color-octet quarkonia production. We find that at low transverse momenta the \psi' is unpolarized due to the contributions proportional to the L=S=0 and L=S=1 color-octet matrix elements. As p_\perp increases, the \psi' mesons become 100% polarized, as predicted
arxiv +1 more source
Chiral anomaly and strange-nonstrange mixing [PDF]
EPJ Web of Conferences, 2019 As a first step, a simple and pedagogical recall of the η-η′ system is presented, in which the role of the axial anomaly, related to the heterochiral nature of the multiplet of (pseudo)scalar states, is underlined.
Giacosa Francesco
doaj +1 more source
Charmonia production in hadron colliders and the extraction of colour-octet matrix elements [PDF]
Nucl.Phys. B508 (1997) 753-767, 1997 We present the results of our analysis on charmonia ($J/\psi$ and $\psi'$) hadroproduction taking into account higher-order QCD effects induced by initial-state radiation in a Monte Carlo framework, with the colour-octet mechanism implemented in the event generation.
arxiv +1 more source
Thermal width and gluo-dissociation of quarkonium in pNRQCD
, 2011 The thermal width of heavy-quarkonium bound states in a quark-gluon plasma has been recently derived in an effective field theory approach. Two phenomena contribute to the width: the Landau damping phenomenon and the break-up of a colour-singlet bound ...
A Beraudo +51 more
core +1 more source