Double Heavy Baryons Research Articles

Relativistic effects in the processes of heavy-quark fragmentation to double-heavy baryons

In the framework based on the quasipotential method and relativistic quark model, we investigate the heavy-quark fragmentation into double-heavy baryons with spin J = 1/2, 3/2. Adopting a two-step scenario for the fragmentation, we take into account relativistic corrections to the fragmentation probabilities at both stages of the production process for the double-heavy diquark and double-heavy baryon, correspondingly. We take into account all possible relativistic corrections including the terms connected with the transformation law of the bound-state wave function to the reference frame of the moving bound state.

GENXICC: A generator for hadronic production of the double heavy baryons [formula omitted], [formula omitted] and [formula omitted

We write down a generator program for the hadronic production of the double-heavy baryons Xi(cc), Xi(bc), and Xi(bb) according to relevant publications. We name it as GENXICC and we test it by comparing its numerical results with those in references. It is written in a PYTHIA-compatible format and it can be easily implemented into PYTHIA. GENXICC is also written in modularization manner, with make, a GNU C compiler, one may apply the generator to various situations or experimental environments very conveniently.

Doubly heavy baryons and quark-diquark symmetry in quenched and partially quenched chiral perturbation theory

We extend the chiral Lagrangian with heavy quark-diquark symmetry to quenched and partially quenched theories. These theories are used to derive formulas for the chiral extrapolation of masses and hyperfine splittings of double heavy baryons in lattice QCD simulations. A quark-diquark symmetry prediction for the hyperfine splittings of heavy mesons and doubly heavy baryons is rather insensitive to chiral corrections in both quenched and partially quenched QCD. Extrapolation formulas for the doubly heavy baryon electromagnetic transition moments are also determined for the partially quenched theory.

New Results on Heavy Flavor Baryons

Heavy flavor baryons are being studied at all high energy machines. Recent results on single-heavy and double-heavy baryon fundamental properties and decay modes are summarized. Future directions for heavy flavor baryon studies are outlined.

Double heavy baryons and dimesons

We critically examine the question whether the cc\bar{q}\bar{q} dimeson is bound or not.

Semileptonic decays of double heavy baryons

We study the semileptonic decays of the lowest lying double heavy baryons using the relativistic three-quark model. We do not employ a heavy quark mass expansion but keep the masses of the heavy quarks and baryons finite. We calculate all relevant form factors and decay rates.

Heavy quark fragmentation into double heavy baryons in the quark-diquark model

In the framework of nonrelativistic QCD and the quark-diquark model of baryons we have obtained the fragmentation functions for heavy quarks that split into spin- 1 2 and spin- 3 2 double heavy baryons. We predict the production rates as well as the shape of the energy spectra for cc- and bc-baryons in the region of the Z 0 peak at the LEP collider.