Baryonic B Decays. FPCP 2010, Torino, Italy May. 26, Jing-Ge Shiu (NTU) J.-G. Shiu Baryonic B Decays/FPCP2010
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1 J.-G. Shiu aryoni Deays/FPCP21 1 aryoni Deays Jing-Ge Shiu (NTU) FPCP 21, Torino, Italy May. 26, 21
2 J.-G. Shiu aryoni Deays/FPCP21 2 Introdution Outline Profound baryoni deays: a unique feature of meson Well established after few years of -fatory running (F(4-body)>) F(3-body) > F(2-body) threshold enhanement in the baryon-antibaryon system Searhing ground for exoti states May have unexpetedly large CP violation in harmless modes Charmed baryoni deays Charmless baryoni deays Summary
3 J.-G. Shiu aryoni Deays/FPCP21 3 Two Fatories KEK SLAC elle aar
4 final elle data taking is ongoing (~1 month) large data sample has been reproessed and is ready to be analyzed J.-G. Shiu aryoni Deays/FPCP21 4
5 J.-G. Shiu aryoni Deays/FPCP21 5 Charmed baryoni deays Reent results: p ; p p K semileptoni deays into
6 J.-G. Shiu aryoni Deays/FPCP21 6 p ; p PRD 78, 1123 (28) (383M ) F ( (85M ) F ( p p) ) (152M ) onsistent with theoretial desription in W.-S. Hou and A. Soni, PRL 86, 4247 (21)
7 J.-G. Shiu aryoni Deays/FPCP21 7 PRD 78, 1123 (28) p ; p Quasi two-body deay (383M ) F ( F ( (2455) p ( ) 1 ) p) 2 F ( F (.91 2 (252) p CL p) F ( F ( (28) p ( ) 1 ) p) 2 first observation of (28) 33 M ( ) MeV, Γ about ¼ of p MeV deays through a resonane.
8 J.-G. Shiu aryoni Deays/FPCP21 8 p K PRD 8, 5115 (R) (29) 467 M Study one Cabibbo-suppressed mode and ompare it with a favored mode F( ) ( ) 1 pk 5 F( p ) ( ) 1 4 CLEO PRD 66, 9111 (22) elle PRD 75, 1111 (27) Ratio =.38.9 V us /V ud 2 = (.536.2) (PDG 28)
9 J.-G. Shiu aryoni Deays/FPCP21 9 p K PRD 8, 5115 (R) (29) 467 M Intermediate states ( 2455) and K * F( F( ( 2455) ) ( ) 1 pk ( 2455) ) ( ) 1 4 p CLEO PRD 66, 9111 (22) elle PRD 75, 1111 (27) 5 Ratio = F( p K ) *
10 J.-G. Shiu aryoni Deays/FPCP21 1 Semileptoni deays into Compare baryoni deays with hadroni deays hep-ex M? / X e e / X / X (red shaded area: peaking G from hadroni deays) F ( F ( F ( F ( X / X / e e e e X ) ) 5% X ) )!!Preliminary!! ( )% F ( F CLEO PRD 57, 664 (1998) X / X ) ) ( )%
11 J.-G. Shiu aryoni Deays/FPCP21 11 Charmless baryoni deays Reent results: p h p
12 PRD 79, 1129 (29) p 467 M F ( p ) ( ) A h 6 elle PRD 76, 524 (27).33 ( p ) ( h A F 449M.29) 1 A near-threshold enhanement also seen polarization study onsistent with full longitudinal right-handed polarization at large * E J.-G. Shiu aryoni Deays/FPCP
13 J.-G. Shiu aryoni Deays/FPCP21 13 h PRD 79, 526 (29) 657 M *(,) h, h K, K, D PRD 79, 526 (29) ph, h, K PRD 76, 524 (27) pph, h, K PRL 1, (28), K, K *(,) *(,) Compare with results h pph to understand the dominant underlying physis h for +, K +, K, K *+, K *
14 J.-G. Shiu aryoni Deays/FPCP21 14 h PRD 79, 526 (29) 657 M
15 J.-G. Shiu aryoni Deays/FPCP21 15 h PRD 79, 526 (29) 657 M A threshold enhanement is also present in these newly observed modes. ΛΛK ΛΛK * threshold enhanement: in baryoni deays, a signal enhanement in the baryon-antibaryon system
16 J.-G. Shiu aryoni Deays/FPCP21 16 h PRD 79, 526 (29) 657 M Fit results in bins of osθ Λ with M ΛΛ <2.85GeV/ 2 Angular distribution of + ΛΛK + Angular distribution of + ppk + Λ(p) θ K + Λ(p) elle PL659, 8-86 (28)
17 J.-G. Shiu aryoni Deays/FPCP21 17 Comparison between pph andλλh PL659:8 (28) PRD79:526 (29) PRL1:25181 (28) the branhing frations indiate no one to one orrespondene omparably smaller F( + ΛΛπ + ) onsiderably larger F( ΛΛK ) lak of peaking feature in osθ Λ distribution for + ΛΛK + the underlying physis between ΛΛh and pph might be different
18 J.-G. Shiu aryoni Deays/FPCP21 18 p PRD 8, (R) (29) 657 M Many 3-body harmless baryoni deays have been studied. How about 4-body modes? F hierarhy? Threshold-enhanement? *(,) h, h K, K, D PRD 79, 526 (29) ph, h, K PRD 76, 524 (27) pph, h, K PRL 1, (28), K, K *(,) *(,) F ( harmed modes: b tree diagram p ) F ( p ) F ( p ) F ( p ) b s penguin or b u tree diagrams F ( p ) F ( p)
19 J.-G. Shiu aryoni Deays/FPCP21 19 p PRD 8, (R) (29) 657 M ρ f 2 (127) F( p +.88 ) = (5.92 ±.69)x1-6 intermediate 3-body deays p F( ) = (4.78 ±.6)x F( pf ) = (2.3 ±.27)x1-6 2 (127) ( 9.1) (9.5) (3) F( p ) tot ( ) 1 6
20 J.-G. Shiu aryoni Deays/FPCP21 2 p PRD 8, (R) (29) 657 M first observation of 4-body harmless baryoni deay F(4-body)> F(3-body)> F(2-body) Multi-body hierarhy holds for harmless baryoni deays near-threshold enhanement also seen
21 J.-G. Shiu aryoni Deays/FPCP21 21 Summary More baryoni modes have been observed (28) p * K, K, p Threshold-enhanement exists in all modes examined so far pph h Comparison between and shows that the dominant underlying deay diagrams may be different First 4-body harmless baryoni deay has been observed R(4-body) R(3-body)>R(2-body), for both harm and harmless baryoni modes.
22 ACKUP slides J.-G. Shiu aryoni Deays/FPCP21 22
23 J.-G. Shiu aryoni Deays/FPCP21 23 harmed double strange baryons and * * PL (29) 657 M * mass M( ) aar MeV/ MeV/ 2 PRL (26) elle MeV/ 2 MeV/ 2 PL (29) 1..9
24 J.-G. Shiu aryoni Deays/FPCP21 24
25 J.-G. Shiu aryoni Deays/FPCP21 25 Semileptoni deays into aar hep-ex (preliminary)
26 Disussion based on quark diagrams J.-G. Shiu aryoni Deays/FPCP21 26 omparably smaller F( + ΛΛπ + ) onsiderably larger F( ΛΛK ) lak of peaking feature in osθ Λ distribution for + ΛΛK + ΛΛh pph?
27 ont d J.-G. Shiu aryoni Deays/FPCP21 27? to ΛΛK mode might behave like to pλπ mode?
28 J.-G. Shiu aryoni Deays/FPCP21 28 p PRD 8, (29) 657 M Intermediate 3-body deay ρ f 2 (127) Red line: Purple: Green: F( p +.88 ) = (5.92 ±.69)x1-6 lue: bakground lak: total p F( ) = (4.78 ±.6)x F( pf ) = (2.3 ±.27)x1-6 2 (127) (9.1) (9.5) (3)
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