Nicolas Matagne

Masses of [70, l(+)] baryons in the 1/N-c expansion

The masses of positive parity [70,0{sup +}] and [70,2{sup +}] nonstrange and strange baryons are calculated in the 1/N{sub c} expansion. The approach is based on the separation of a system of N{sub c} quarks into an excited core and an excited quark. The previous work for two flavor baryons is now extended to include strange baryons, to first order in SU(3)-flavor breaking. We show that the extension to N{sub f}=3 maintains the regularities previously observed in the behavior of the linear term in N{sub c}, of the spin-spin and of the spin-orbit terms. In particular the contribution of the spin-dependent terms decrease with the excitation energy, the dominant term remaining the spin-spin term.

[56,4(+)] baryons in the 1/N-c expansion

Using the

Matrix elements of SU(6) generators for baryons at arbitrary N-c

1/N_c

Cold Nuclear Matter Effects on extrinsic

expansion of QCD we analyze the spectrum of positive parity resonances with strangeness

J/\psi

S = 0, -1, -2

production at

and -3 in the 2-3 GeV mass region, supposed to belong to the

\sqrt{s_{NN}}=2.76

[\textbf{56},4^+]

TeV at the LHC

multiplet. The mass operator is similar to that of

New look at the (70,1-) baryon multiplet in the 1/N(c) expansion

[\textbf{56},2^+]

Cold Nuclear Matter effects on J/ψ production with extrinsic PT at sNN=2.76 TeV at the LHC

, previously studied in the literature. The analysis of the latter is revisited. In the