Exotic Multi-quark States in the Deconfined Phase from Gravity Dual Models - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: In the deconfined phase of quark-gluon plasma, it seems that most of thequarks, antiquarks and gluons should be effectively free in the absence of thelinear confining potential. However, the remaining Coulomb-type potentialbetween quarks in the plasma could still be sufficiently strong that certainbound states, notably of heavy quarks such as $J-\psi$ are stable even in thedeconfined plasma up to a certain temperature. Baryons can also exist in thedeconfined phase provided that the density is sufficiently large.We study three kinds of exotic multi-quark bound states in the deconfinedphase of quark-gluon plasma from gravity dual models in addition to the normalbaryon. They are $k$-baryon, $N+\bar{k}$-baryon and a bound state of $j$mesons which we call -$j$-mesonance-. Binding energies and screening lengths ofthese exotic states are studied and are found to have similar properties tothose of mesons and baryons at the leading order. Phase diagram for the exoticnuclear phases is subsequently studied in the Sakai-Sugimoto model. Even thoughthe exotics are less stable than normal baryons, in the region of high chemicalpotential and low temperature, they are more stable thermodynamically than thevacuum and chiral-symmetric quark-gluon plasma phases $\chi$S-QGP.



Author: P. Burikham, A. Chatrabhuti, E. Hirunsirisawat

Source: https://arxiv.org/







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