نتایج جستجو برای: antiquark interaction
تعداد نتایج: 566879 فیلتر نتایج به سال:
The main objective of this work is to explore the evolution in the structure of the quark-antiquark bound states in going down in the chirally restored phase from the so-called " zero binding points " T zb to the QCD critical temperature T c at which the Nambu-Goldstone and Wigner-Weyl modes meet. In doing this, we adopt the idea recently introduced by Shuryak and Zahed for charmed ¯ cc, light-...
In this work a static quark-antiquark potential that is valid for all quark-antiquark separations is constructed. By matching the long range results from lattice QCD to a short range perturbative part we get a continuous potential expression. The lattice part is obtained by tting an analytic potential model to lattice data for di erent lattice spacings a. Extrapolating the tting parameters to t...
We calculate the leading mass-suppressed two-loop contribution, proportional to αs/(mqr 2), to the potential of a heavy quark-antiquark system. This contribution originates in the nonabelian nature of quantum chromodynamics (QCD) and has no analogue in quantum electrodynamics (QED). For this purpose, we elaborate a technique based on the implementation of the threshold expansion within the effe...
Detailed measurements of t-channel single topquark production are presented. They use 20.2 fb−1 of data collected by the ATLAS experiment in proton–proton collisions at a centre-of-mass energy of 8 TeV at the LHC. Total, fiducial and differential cross-sections are measured for both top-quark and top-antiquark production. The fiducial crosssection is measured with a precision of 5.8% (top quark...
Detailed measurements of t-channel single top-quark production are presented. They use 20.2 fb[Formula: see text] of data collected by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of 8 TeV at the LHC. Total, fiducial and differential cross-sections are measured for both top-quark and top-antiquark production. The fiducial cross-section is measured with a precision...
The leading nonperturbative QCD corrections to the one gluon exchange quark-quark, quark-antiquark and q ¯ q pair-excitation potentials are derived by using a covariant form of nonlocal two-quark and two-gluon vacuum expectation values. Our numerical calculation indicates that the correction of quark and gluon condensates to the quark-antiquark potential improves the heavy quarkonium spectra to...
In this paper, we study the scalar-diquark–scalar-diquark–antiquark-type [Formula: see text] pentaquark state with QCD sum rules, predicted mass is in excellent agreement experimental data from LHCb collaboration, and supports assigning to be hidden-charm spin-parity text]. We take into account flavor mass-breaking effect, estimate spectrum of diquark–diquark–antiquark-type states strangeness
Recent developments for an effective theory for non-relativistic perturbative quark–antiquark systems are reviewed and some applications are discussed. Invited talk given at the 5th Workshop on QCD (QCD 2000), Villefranche-sur-Mer, France, 3-7 January 2000 CERN-TH/2000-143 August 2000 Non-Relativistic Effective Field Theory for Perturbative Heavy Quark–Antiquark Systems
A dynamical quark model of hadron and nucleus structure is proposed. In the frame of the model, called the Strongly Correlated Quark Model, quarks and nucleons inside nuclei are arranged in crystal– like structure. How are nucleon properties modified inside nuclei and do quarks manifest themselves explicitly in ground state nuclei? These questions are the topics of this paper, where we show tha...
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