Results 21 to 29 of about 197,415 (29)

Heavy quark symmetry constraints on semileptonic form factors and decay widths of doubly heavy baryons [PDF]

, 2008
We show how heavy quark symmetry constraints on doubly heavy baryon semileptonic decay widths can be used to test the validity of different quark model calculations. The large discrepancies in the results observed between different quark model approaches
Albertus, Bhaduri, Carone, E. Hernández, Ebert, Faessler, Flynn, Georgi, Georgi, Guo, Isgur, Isgur, J. Nieves, J.M. Verde-Velasco, Jenkins, Kiselev, Kiselev, Llewellyn Smith, Nussinov, Onishchenko, Onishchenko, Politzer, Politzer, Sanchis-Lozano, Sanchis-Lozano, Savage, Semay, Shifman, Silvestre-Brac, Thacker, White, Yao   +31 more
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Extended Quark Potential Model from Random Phase Approximation

, 2002
The quark potential model is extended to include the sea quark excitation using the random phase approximation (RPA). The effective quark interaction preserves the important Quantum Chromodynamics (QCD) properties -- chiral symmetry and confinement ...
Chen, Xiaolin, Deng, Weizhen, Lu, Dahai, Yang, Liming   +3 more
core   +1 more source

The Quark Spin Distributions of the Nucleon

, 1998
The quark helicity measured in polarized deep inelastic scattering is different from the quark spin in the rest frame of the nucleon. We point out that the quark spin distributions $\Delta q_{RF}(x)$ are connected with the quark helicity distributions ...
Aoki, Bo-Qiang Ma, Bourrely, Brodsky, Fukugita, Ivan Schmidt, Jacques Soffer, Jaffe, Jakob, Ma, Schmidt, Soffer   +11 more
core   +2 more sources

Quark model: recent issues [PDF]

, 2007
In the first part I briefly survey recent issues in constituent quark models raised by the observation of unusual hadronic states. In particular I discuss the role of higher Fock components in the wave function of baryons and the possible interpretation ...
Stancu, Fl.
core  

Top Quark Physics at the Tevatron

, 2011
We review the field of top-quark physics with an emphasis on experimental techniques. The role of the top quark in the Standard Model of particle physics is summarized and the basic phenomenology of top-quark production and decay is introduced.
Aguilar-Saavedra, J. A., Dokshitzer Yu. L., Douglas A. Glenzinski, Frédéric Déliot, Galea, C., Gribov, V., Loader, C., Ross, G. G., Scott, D. W., Silverman, B. W., Sinervo, P.   +10 more
core   +1 more source

Nonperturbative partonic quasidistributions of the pion from chiral quark models

, 2017
We evaluate nonperturbatively the quark quasidistribution amplitude and the valence quark quasidistribution function of the pion in the framework of chiral quark models, namely the Nambu--Jona-Lasinio model and the Spectral Quark Model.
Arriola, Enrique Ruiz, Broniowski, Wojciech   +1 more
core   +2 more sources

Hadron Resonance Mass Spectrum and Lattice QCD Thermodynamics

, 2003
We confront lattice QCD results on the transition from the hadronic phase to the quark--gluon plasma with hadron resonance gas and percolation models. We argue that for T < T_c the equation of state derived from Monte--Carlo simulations of (2+1) quark ...
), ), ), Baym, Berges, Bernard, Braun-Munzinger, Cabibbo, DeGrand, Edwards, Gerber, Hagedorn, Ishii, Karsch, Karsch, Karsch, Karsch, Karsch, Lee, Letessier, McLerran, Meyer-Ortmanns, Pisarski, Richards, Satz   +24 more
core   +1 more source

New signals for vector-like down-type quark in $U(1)$ of $E_6$

, 2017
We consider the pair production of vector-like down-type quarks in an $E_6$ motivated model, where each of the produced down-type vector-like quark decays into an ordinary Standard Model light quark and a singlet scalar.
Das, Kasinath, Li, Tianjun, Nandi, S., Rai, Santosh Kumar   +3 more
core   +1 more source

Quark Model Perspectives on Pentaquark Exotics

, 2004
Expectations and predictions for pentaquark exotics based on the quark model perspective are presented. Recent quark model scenarios, and calculations performed in different realizations of the quark model approach, up to the end of March 2004, are also ...
Maltman, Kim
core   +2 more sources