Heavy quark systems and hadron mass spectra

The influence of chromomagnetic hyperfine interaction onB andT hadrons is studied. The colour magnetic moments are related to the hyperfine splittings of hadrons.     

重夸克偶素质量谱的相对论夸克模型研究（已撤稿）

使用量子场论中准势途径的相对论夸克模型,计算了重夸克偶素的质量谱.所采用的同味正反夸克间的有效相互作用包括通常的直接单胶子交换、单胶子湮没及具有相对论修正的标量和矢量线性禁闭的混合.得到了与实验上肯定的数据符合较好的拟合计算结果，并讨论了湮没项和相对论修正各项对能谱超精细分裂的作用. 关键词： 重夸克偶素 质量谱 相对论修正 湮没势     

Heavy quark spectroscopy

Non-relativistic Schr?dinger wave equation has been solved numerically by MATSLISE package to calculate mass spectra of t $ bar t $ bar t system for Cornell, Song-Lin and Turin potentials taking as the top of the recently reported experimental value of 177.1 GeV as the top quark mass. Energy splitting (2S-1S) with variation of mass has been calculated and compared with those obtained in earlier calculations. Variation of leptonic decay width with top quark mass has also been studied.     

Heavy quark production in jets

Zeitschrift für Physik C Particles and Fields - We study possible deviations from the Standard Model in the reactione + e ?→Z?, where ? denotes a spinless neutral boson....     

Heavy baryons in the relativistic quark model

We present a summary of results for exclusive decays of single and double heavy-flavored baryons in the relativistic three-quark model.     

Heavy baryons in the relativistic quark model

In the framework of the relativistic quasipotential quark model the mass spectrum of baryons with two heavy quarks is calculated. The quasipotentials for interactions of two quarks and of a quark with a scalar and axial vector diquark are evaluated. The bound state masses of baryons with are computed.     

Charm quark mass

We report on the result for the charm quark mass as obtained from our lattice QCD computation in the quenched approximation. Our result is $\text{m}{}_{\mathrm{c}}{}^{\mathrm{<mtext>\; </mtext><mtext>\; </mtext><mtext>MS</mtext><mtext>\; </mtext><mtext>\; </mtext>}}\text{(m}{}_{\mathrm{c}}\text{)=1.26(4)(12)}$ GeV.     

Heavy quark pair correlations in QCD

The azimuthal correlations of heavy quarks produced in high energy pp () collisions are calculated in the perturbative QCD without usual assumptions of the parton model. The virtual nature of the interacting gluons as well as their transverse motion and different polarizations are taken into account within the framework of the semihard processes theory describing the parton distributions in the region of the small Bjorken variable x. We give some predictions for the azimuthal correlations of charm and beauty hadrons produced at Tevatron-collider and LHC. Our approach can be of interest also for HERA energy region, since it shows a difference with the conventional parton model in the small x domain. Received: 7 August 1997 / Revised version: 20 Jauary 1998 / Published online: 6 November 1998     

Dual strings in the Amati-Testa quark imprisonment scheme

We indicate how a dual string structure can exist in the quark imprisonment scheme of Amati and Testa.     

Heavy quark results from STAR

I report the most recent measurements on open heavy flavor production at RHIC on behalf of the STAR collaboration. The total charm production cross section in midrapidity at RHIC energy is found to approximately scale by number of binary collisions in d + Au, Cu + Cu and Au + Au collisions. The nuclear modification factor of non-photonic electrons is strongly suppressed in central Au + Au collisions, suggesting substantial heavy quark energy loss at RHIC. The bottom decay contribution to non-photonic electrons was studied via the e–h and e–D ⁰ azimuthal angular correlations. The bottom contribution is found to be important at p _T >5 GeV/c, and is consistent with the FONLL calculation within uncertainties. Charm production through gluon jet splitting was measured by studying the D ^*± contents in the fully reconstructed jets in p+p collisions. This rate is consistent with pQCD evaluation of gluon splitting into a pair of charm quarks and subsequent hadronization.     

The sixth quark mass

In six quark models with the gauge group SU (2)_L × SU (2)_R × U (1), and left-right symmetry, we investigate how weak mixing angles can be predicted in a natural way as functions of the quark masses, and find that the mass of the sixth quark can be naturally determined by the five others.