Results 21 to 30 of about 38,607,398 (267)

Study of Hidden-Charm and Hidden-Bottom Pentaquark Resonances in the Quark Model

open access: yesUniverse, 2023
Inspired by the LHCb observation of hidden-charm pentaquarks, i.e., Pc(4312), Pc(4440), and Pc(4457) in the J/ψp invariant mass spectrum, a calculation of the J/ψp scattering cross-section was performed using the quark-delocalization color screening ...
Xinmei Zhu   +4 more
doaj   +1 more source

Third family of compact stars within a nonlocal chiral quark model equation of state [PDF]

open access: yesPhysical Review D, 2018
We suggest a class of hybrid compact star equations of state which support the existence of a third family of compact stars composed of a core of two-flavor quark matter and a shell of hadronic matter described within a relativistic meanfield model with ...
D. Alvarez-Castillo   +3 more
semanticscholar   +1 more source

A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at s√=7TeV [PDF]

open access: yes, 2012
A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of s√=7TeV during 2011, corresponding to an integrated ...

core   +3 more sources

UNQUENCHING THE QUARK MODEL [PDF]

open access: yesTheoretical Nuclear Physics in Italy, 2007
We present the formalism for a new generation of unquenched quark models in which quark-antiquark pair effects are taken into account in an explicit form via a microscopic QCD-inspired quark-antiquark creation mechanism. No truncation in the sum over all the big tower of states is necessary since these states are automatically generated by means of ...
Santopinto, E., Bijker, R.
openaire   +2 more sources

Masses of the doubly heavy tetraquarks in a constituent quark model [PDF]

open access: yesNuclear Physics, 2018
We perform a constituent quark model analysis for the masses of the doubly heavy tetraquark states T Q Q after we fix the parameters to fit the masses of the newly observed Ξ c c + + and hadrons involving heavy quarks relevant to the stability of these ...
Woosung Park, Sungsik Noh, S. H. Lee
semanticscholar   +1 more source

Test of lepton universality in beauty-quark decays [PDF]

open access: yesNature Physics, 2021
The standard model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction ...
L. C. R. Aaij   +499 more
semanticscholar   +1 more source

THE HYPERCENTRAL CONSTITUENT QUARK MODEL [PDF]

open access: yesHadrons, Nuclei and Applications, 2001
The hypercentral Constituent Quark Model is presented and its application to the description of the electromagnetic properties of baryons is reviewed. The results concerning the elastic nucleon form factors and the electromagnetic excitation of baryon resonances are compared with the recent experimental ...
GIANNINI, MAURO, Santopinto, E.
openaire   +8 more sources

Measurement of the top quark charge in pp collisions at s√=7 TeV with the ATLAS detector [PDF]

open access: yes, 2013
A measurement of the top quark electric charge is carried out in the ATLAS experiment at the Large Hadron Collider using 2.05 fb−1 of data at a centre-of-mass energy of 7 TeV. In units of the elementary electric charge, the top quark charge is determined

core   +3 more sources

Valence quark distributions of light mesons in light-cone quark model

open access: yesSciPost Physics Proceedings, 2022
In order to investigate the tomographical structure of light pseudoscalar mesons, particularly, pion and kaon, we study the valence quark distribution function (PDF) and the generalized parton distributions (GPDs) using light-cone quark model (LCQM).
Satvir Kaur, Narinder Kumar, Jiangshan Lan, Chandan Mondal, Harleen Dahiya
doaj   +1 more source

Quark-resonance model [PDF]

open access: yesZeitschrift für Physik C Particles and Fields, 1995
We construct an effective Lagrangian for low energy hadronic interactions through an infinite expansion in inverse powers of the low energy cutoff $Λ_χ$ of all possible chiral invariant non-renormalizable interactions between quarks and mesons degrees of freedom. We restrict our analysis to the leading terms in the $1/N_c$ expansion.
Pallante, E., Petronzio, R.
openaire   +2 more sources

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