Angular distributions in three-body baryonicBdecays

Phenomenological analysis of the decay $$B^{\pm }\rightarrow K^{\pm } p {\bar{p}}$$ B ± → K ± p p ¯

“…[9], which is linear in cos θ p . This explanation of the large asymmetry could be alternative to the one proposed by other authors [11]. (d) Lastly, the CP asymmetry ( A CP ) is found to be positive according to our parametrization, which does not differ so much from the prediction of the factorization assumption (see also Ref.…”

“…(d) Lastly, the CP asymmetry ( A CP ) is found to be positive according to our parametrization, which does not differ so much from the prediction of the factorization assumption (see also Ref. [11]); on the contrary, experiments seem to indicate a negative value, although compatible with a positive asymmetry within errors. Therefore, if a more accurate determination of this observable could be desirable, also a deeper analysis of the model is needed.…”

“…[7] for a complete and thorough review. More recently, this interest was revived [8][9][10][11][12] and new experimental results were a e-mail: disalvo@ge.infn.it; Elvio.Disalvo@ge.infn.it b e-mail: Flavio.Fontanelli@ge.infn.it found by the CLEO [13], Belle [14,15] and BaBar [16,17] Collaborations.…”

RareB−→Λp¯νν¯decay

“…However, the situation for the baryonic decays are different. Recall that the large angular asymmetry observed to be 60% in the B − → ppK − decay [10] has been attributed to theB → BB ′ transition via the (pseudo-)scalar couplings [19]. Since the decay of B − → ΛpSS through b → sSS has the same type of theB → BB ′ transition, we expect it to be largely angularasymmetric, whereas A θ B (B − → Λpνν) is predicted to be as small as 1 %.…”

“…However, since B − → Λpνν is considered to associate with the three-body baryonicB decays ofB → pp (K ( * ) , π, ρ) [10][11][12][13][14][15] andB 0 → ppD ( * )0 [16,17] via theB → BB ′ transitions, the solution can be simply made. The parameterizations for theB → BB ′ transitions in [18][19][20][21][22][23][24] can be reliably adopted, as the theoretical studies of B(B → ΛΛK) [22], B(B 0 → ΛΛD 0 ) and B(B − → ΛpD ( * )0 ) [23] relating theB → BB ′ transitions are approved to agree with the data [25,26]. In addition, with the B − → pp transition, the CP violation for B − → ppK * − [24] is found to be nearly 20% of the world average [27,28] even though it is still inconclusive experimentally due to the data errors.…”