Zobrazeno 1 - 10
of 142
pro vyhledávání: '"Tandy, P. C."'
Autor:
Tandy, Peter C.
The lowest two Mellin moments of hadronic Generalized Parton Distributions are explored within a model that allows investigation of the inter-related quark and gluon contributions. For light quarks their dynamical connection is strong due to quark dr
Externí odkaz:
http://arxiv.org/abs/2302.07473
Autor:
Costa, C. S. R., Freese, Adam, Cloët, Ian C., El-Bennich, Bruno, Krein, Gastão, Tandy, Peter C.
Publikováno v:
Phys. Rev. C 104, 045201 (2021)
We construct a quark target model (QTM) to incorporate intrinsic glue into effective low-energy models of QCD, which often contain only quark degrees of freedom. This method guarantees the gauge invariance of observables order-by-order in the strong
Externí odkaz:
http://arxiv.org/abs/2103.17163
Gluon dressing of the light quarks within hadrons is very strong and extremely important in that it dynamically generates most of the observable mass through the breaking of chiral symmetry. The quark and gluon parton densities, $q(x)$ and $g(x)$, ar
Externí odkaz:
http://arxiv.org/abs/2103.05839
Publikováno v:
Phys. Rev. Lett. 124, 042002 (2020)
The leading-twist parton distribution functions of the pion and kaon are calculated for the first time using a rainbow-ladder truncation of QCD's Dyson-Schwinger equations (DSEs) that self-consistently sums all planar diagrams. The non-perturbative g
Externí odkaz:
http://arxiv.org/abs/1811.12310
We present results for the nucleon's leading-twist spin-independent valence parton distribution functions obtained from a theoretical framework based on the Dyson-Schwinger equations (DSEs) of QCD that previously gave an excellent description of nucl
Externí odkaz:
http://arxiv.org/abs/1803.03656
Publikováno v:
Phys. Rev. D 96, 034024 (2017)
A continuum approach to the kaon and pion bound-state problems is used to reveal their electromagnetic structure. For both systems, when used with parton distribution amplitudes appropriate to the scale of the experiment, Standard Model hard-scatteri
Externí odkaz:
http://arxiv.org/abs/1703.04875
Autor:
Raya, K., Chang, L., Bashir, A., Cobos-Martinez, J. J., Gutiérrez-Guerrero, L. X., Roberts, C. D., Tandy, P. C.
Publikováno v:
Phys. Rev. D 93, 074017 (2016)
The $\gamma^\ast \gamma \to \pi^0$ transition form factor, $G(Q^2)$, is computed on the entire domain of spacelike momenta using a continuum approach to the two valence-body bound-state problem in relativistic quantum field theory: the result agrees
Externí odkaz:
http://arxiv.org/abs/1510.02799
Autor:
Tandy, Peter C
Publikováno v:
Few Body Syst. vol 55, 357-365 (2014)
We describe results for the pion distribution amplitude (PDA) at the non-perturbative scale $\mu=~$2GeV by projecting the Poincar\'e-covariant Bethe-Salpeter wave-function onto the light-front and use it to investigate the ultraviolet behavior of the
Externí odkaz:
http://arxiv.org/abs/1407.0494
Autor:
Chang, Lei, Mezrag, Cédric, Moutarde, Hervé, Roberts, Craig D., Rodríguez-Quintero, Jose, Tandy, Peter C.
The impulse-approximation expression used hitherto to define the pion's valence-quark distribution function is flawed because it omits contributions from the gluons which bind quarks into the pion. A corrected leading-order expression produces the mo
Externí odkaz:
http://arxiv.org/abs/1406.5450
Autor:
Shi, Chao, Chang, Lei, Roberts, Craig D., Schmidt, Sebastian M., Tandy, Peter C., Zong, Hong-Shi
We compute the kaon's valence-quark (twist-two parton) distribution amplitude (PDA) by projecting its Poincare'-covariant Bethe-Salpeter wave-function onto the light-front. At a scale \zeta=2GeV, the PDA is a broad, concave and asymmetric function, w
Externí odkaz:
http://arxiv.org/abs/1406.3353