Weak electromagnetic decays of charm baryons

Abstract

In view of recent experimental trends we investigate the weak photonic decays of charmed baryons within the framework of the constituent quark model. Decay widths and asymmetry parameters for all i++f + + y charm-changing modes are calculated with appropriate QCD corrections. PACS number(s): 13.40. Hq, 12.40.Aa, 14.20.K~

Constituent quark model analysis of weak mesonic decays of charm baryons

“…Evidence to corroborate this has been found in the quark model [16,21] as well as in lattice calculations [22]. The flavor dependence reflected in the scale factor corresponding to the spatial matrix element is due to the long-distance QCD effects.…”

“…However, modes such as (4) breaking is included in the scale I I ) ( 0 ) 1 [16] and the strong-coupling constants [18].…”

Two-body Cabibbo-suppressed decays of charmed baryons into vector mesons and into photons

“…for R = −0.09, −0.25 or −0.41. These figures may be compared with a previous calculation [17] using bremsstrhlung from W-exchange diagrams on the quark level.…”

Weak radiative decays of hyperons and of charm and beauty baryons

“…[4] Ref. [4] Ref. [ and results from a heavy-quark effective theory calculation [5] with c and s quarks as heavy are presented in Table 2 for the CKM allowed decays.…”

“…Although hyperon decays have been under scrutiny for some three decad the subject still carries the burden of a major puzzle and of discrepancies between existing data and a variety of theoretical models [1,2]. At the other end of quarks spectrum, there are no data yet on weak radiative decays of heavy baryons; however, estimates [3][4][5][6] for some of these modes allows us to anticipate optimistically their future detection.…”