Constituent quark model analysis of weak mesonic decays of charm baryons

Abstract

In view of recent experimental trends we investigate the weak nonleptonic decays of charm baryons within the framework of the constituent quark model. Branching ratios and asymmetry parameters for all $++i++O-charm-changing modes are calculated with appropriate QCD corrections. The effect of flavor dependence on the scale is found to be quite significant.

Test flavor SU(3) symmetry in exclusiveΛcdecays

“…We believe this difference will be clarified in future since the experimental prospect on charmed baryon decays will be very promising [5,6]. Theoretical description of charmed baryon decays is mostly based on the factorization assumption together with the analysis of some non-factorizable contributions in nonperturbative explicit modes [7][8][9][10]. However the factorization scheme does not seem to be supported by experiments, for instance the observed large branching fraction for decays like Λ c → Σ + π 0 /Ξ 0 K + , which are forbidden in the factorization scheme [11].…”

Charmed baryons circa 2015

“…Various theoretical approaches to weak decays of heavy baryons have been investigated, including the current algebra approach [101][102][103][104][105][106][107][108][109][110][111][112][113][114][115][116][117], factorization scheme, pole model technique [98,[118][119][120][121][122]], relativistic quark model [100,123], and quark diagram scheme [124,125]. Model predictions of the branching fractions and decay asymmetries can be found in Tables VI-VII of [1] for B c → B + P decays, …”

Evidence for the singly Cabibbo suppressed decayΛc+→pηand search for

“…These two decays proceed predominantly through internal W -emission and W -exchange diagrams, which are non-factorizable and not subject to color and helicity suppression in charmed baryon decay. Some theoretical models [3,4,12,13], predict the BFs of these two process under different assumptions (the flavor SU(3) symmetry, FSI) obtaining different results. Therefore, measurements of these BFs will help us to understand the underlying dynamics of charmed baryon decays and distinguish between the different models.…”

“…the quark model approach to non-leptonic charm decays and Heavy Quark Effective Theory [1][2][3][4][5][6][7]. The charmed baryon ground state Λ + c was first observed in 1979 [8,9], but, compared to the rapid advances of charmed mesons, progress in the studies of the charmed baryons has been relatively slow due to a lack of experimental data and the additional difficulties of three constituent quarks in theoretical calculation.…”