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Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons

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Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons

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dc.contributor.author Xiao, Chu Wen
dc.contributor.author Nieves Pamplona, Juan Miguel
dc.contributor.author Oset Báguena, Eulogio
dc.date.accessioned 2014-02-17T14:04:30Z
dc.date.available 2014-02-17T14:04:30Z
dc.date.issued 2013
dc.identifier.citation Xiao, Chu Wen Nieves Pamplona, Juan Miguel Oset Báguena, Eulogio 2013 Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons Physical Review D 88 5 056012
dc.identifier.uri http://hdl.handle.net/10550/33003
dc.description.abstract We present a coupled channel unitary approach to obtain states dynamically generated from the meson-baryon interaction with hidden charm, using constraints of heavy quark spin symmetry. As a basis of states, we use (D) over barB, (D) over bar *B states, with B baryon charmed states belonging to the 20 representations of SU(4) with J(P) = 1/2(+), 3/2(+). In addition we also include the eta N-c and J/psi N states. The inclusion of these coupled channels is demanded by heavy quark spin symmetry, since in the large m(Q) limit the D and D* states are degenerate and are obtained from each other by means of a spin rotation, under which QCD is invariant. The novelty in the work is that we use dynamics from the extrapolation of the local hidden gauge model to SU(4), and we show that this dynamics fully respects the constraints of heavy quark spin symmetry. With the full space of states demanded by the heavy quark spin symmetry and the dynamics of the local hidden gauge, we look for states dynamically generated and find four basic states that are bound, corresponding to (D) over bar Sigma(c), (D) over bar Sigma(c)*, (D) over bar*Sigma(c) and (D) over bar*Sigma*(c) decaying mostly into eta N-c and J/psi N. All the states appear in isospin I = 1/2, and we find no bound states or resonances in I = 3/2. The (D) over bar Sigma(c) state appears in J = 1/2 and the (D) over bar Sigma*(c) in J = 3/2; the (D) over bar*Sigma(c) appears nearly degenerate in J = 1/2, 3/2 and the (D) over bar*Sigma*(c) appears nearly degenerate in J = 1/2, 3/2, 5/2, with the peculiarity that in J = 5/2 the state has zero width in the space of states chosen. All the states are bound with about 50 MeV with respect to the corresponding (D) over barB thresholds, and the width, except for the J = 5/2 state, is also of the same order of magnitude. Finally, we discuss the uncertainties stemming from the expected breaking of SU(4) and the heavy quark spin symmetry.
dc.relation.ispartof Physical Review D, 2013, vol. 88, num. 5, p. 056012
dc.subject Física
dc.title Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons
dc.type journal article es_ES
dc.date.updated 2014-02-17T14:04:30Z
dc.identifier.doi 10.1103/PhysRevD.88.056012
dc.identifier.idgrec 091358
dc.rights.accessRights open access es_ES
dc.identifier.url 10.1103/PhysRevD.88.056012

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