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[en] Scientists from the LHCb experiment at the large hadron collider (LHC) in CERN have announced the discovery of a new particle named Ξcc++. This particle being made up of 3 quarks is a baryon but it is the first baryon ever discovered containing 2 charmed quarks. Its mass equals 3261 MeV which is almost 4 times the proton mass. (A.C.)
[en] The in-medium properties of the heavy spin-3/2 , and baryons with Q being b or c quark are investigated. The shifts in some spectroscopic parameters of these particles due to the saturated cold nuclear matter are calculated. The variations of those parameters with respect to the changes in the density of the cold nuclear medium are studied, as well. It is observed that the parameters of baryons are considerably affected by the nuclear matter compared to the and particles that roughly do not see the medium. The results obtained may be used in analyses of the data to be provided by the in-medium experiments like PANDA.
[en] We give improved estimates for the non-perturbative parameters appearing in the heavy quark expansion for inclusive decays. While the parameters appearing in low orders of this expansion can be extracted from data, the number of parameters in higher orders proliferates strongly, making a determination of these parameters from data impossible. Thus, one has to rely on theoretical estimates which may be obtained from an insertion of intermediate states. In this paper we refine this method and attempt to estimate the uncertainties of this approach
[en] The hadron spectroscopy is interesting due to the number of states observed experimentally. The theoretical explanation of orbitally excited state of charmonium is challenging because many states may have possibilities of exotic states. As the mass of the charm quark is in the higher side we consider non-relativistic approach to determine the D wave mass spectra of charmonia. And further we have calculated the triple gluon decay of Decay of the D wave state at zero separation and at color compton radius. There are many methods to estimate the mass of a hadron, among which the phenomenological potential model is fairly reliable one, epically for heavier hadrons
[en] In this Letter, we propose interpolating currents for the X(3872) resonance, and show that, in the heavy quark limit of QCD, the X(3872) state should have degenerate partners, independent of its internal structure. Magnitudes of possible I=0 and I=1 components of the X(3872) are also discussed
[en] In this introductory overview I will discuss recent developments in hadron spectroscopy that are of particular relevance to this meeting, including the spectroscopy of heavy quark hadrons, exotic and multiquark systems, and new theoretical results such as developments in LQCD. (author)
[en] Charm quarks are mostly produced in the pre-equilibrium phase of relativistic heavy ion collisions and primarily due to prompt gluon fusion and interactions among high energy partons. The produced charm quarks undergo modification while moving through quark gluon plasma. Consequently studies of charm spectra via its mesonic channels and their decay product give information on the medium properties. We present results on the modification of heavy quark energy and momentum spectra due to hot and dense medium (QGP) at LHC collider energies. (author)
[en] Basic types of parametrizations are considered for the heavy-quark fragmentation function. The kinematical boundaries of the fragmentation-model applicability region are found. Nonfragmentation contributions to the production of heavy mesons are estimated.