Light-Front Approach for Heavy Pentaquark Transitions

Details Light-Front Approach for Heavy Pentaquark Transitions Light-Front Approach for Heavy Pentaquark Transitions

2004-03-22

arxiv.org/abs/hep-ph/0403232v2

Phys.Rev. D70 (2004) 034007

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages, 3 figures, version to be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.70.034007

Assuming the two diquark structure for the pentaquark state as advocated in the Jaffe-Wilczek model, there exist exotic parity-even anti-sextet and parity-odd triplet heavy pentaquark baryons. The theoretical estimate of charmed and bottom pentaquark masses is quite controversial and it is not clear whether the ground-state heavy pentaquark lies above or below the strong-decay threshold. We study the weak transitions of heavy pentaquark states using the light-front quark model. In the heavy quark limit, heavy-to-heavy pentaquark transition form factors can be expressed in terms of three Isgur-Wise functions: two of them are found to be normalized to unity at zero recoil, while the third one is equal to 1/2 at the maximum momentum transfer, in accordance with the prediction of the large-Nc approach or the quark model. Therefore, the light-front model calculations are consistent with the requirement of heavy quark symmetry. Numerical results for form factors and Isgur-Wise functions are presented. Decay rates of the weak decays Theta_b+ to Theta_c0 pi+ (rho+), Theta_c0 to Theta+ pi- (rho-), Sigma'_{5b}+ to Sigma'_{5c}0 pi+ (rho+) and Sigma'_{5c}0 to N_8+ pi- (rho-) with Theta_Q, Sigma'_{5Q} and N_8 being the heavy anti-sextet, heavy triplet and light octet pentaquarks, respectively, are obtained. For weakly decaying Theta_b+ and Theta_c0, the branching ratios of Theta_b+ to Theta_c0 pi+, Theta_c0 to Theta+ pi- are estimated to be at the level of 10^{-3} and a few percents, respectively.

Affiliated with

Also associated with

No associations

Rating

Light-Front Approach for Heavy Pentaquark Transitions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Light-Front Approach for Heavy Pentaquark Transitions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light-Front Approach for Heavy Pentaquark Transitions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-701574