Hadron Physics at Belle Exotic Hadron Spectroscopy etc

Hadron Physics at Belle - Exotic & Hadron Spectroscopy etc. - Symposium on Hadron Physics 2014. 04. 17 KEK Y. Sakai 1

“Exotic”& New Resonances New resonances discovered Zb 0 at B-Factories Zb(10610), Zb(10650) Integrated Luminosity X(3915), Y(4350) Yb Z(4050), Z(4250) Y(4660) Z(4430) Y(4008) Ds. J(2700) Xcx(3090) cc 2’ X(3940), Y(3940) Sc* baryon triplet X(3872) D 0*0 & D 1*0 Ds. J(2860) Y(4320) Y(4260) Ds. J(2317/2460) c’ & e+e- cccc hb Observed >15 Exotic resonances Z(3885) b(2 S) Charged u c c d c c Tetraquark Neutral u u u c c cluster g c c u Hybrid Can reveal structure of exotic resonances 2

Variety of Processes at BF (1) Ø B-meson decays Charmonium(-like) Charmed mesons Charmed Baryons/Pentaquark B(B → p. X)=8% Light hadrons Ø ISR e+e- annihilation Charmonium(-like) [JPC =1 - - ] (ss-bar) (l-ike) states [JPC =1 - - ] Mass range 0. 5 – 9? Ge. V 3

Variety of Processes at BF (2) Ø e+e- → charmonium + X Charmonium(-like) [C= +] (ss-bar) (-like) states [C= +] X = Missing, y+Missing Ø Tow-photon process ( → X) Charmonium(-like) [JPC =, 0 -, 2 - ] (ss-bar) (l-ike) states [JPC =, 0 -, 2 - ] Mass range 0. 5 – 5? Ge. V 4

Variety of Processes at BF (4) Ø Decays from Y(n. S) Bottomonium(-like) Charmonium(-like) pair H-dibaryons Ø Detector as target Pentaquark [PLB 632, 173 (2006)] Strange Baryon K, L beams Ø e+e- → inclusive hadrons 5

New Resonances by Belle Resonance Spectrum discover by Belle Υ(４ S) Υ(5 S) 2003~2009. 8(15 states) 2009. 8~(11 states) Zb 0 Bottom Flavor Region b(2 S) Z(4200)+ X(3825) Z(3885)+ Charm Flavor Region 6

Studies on known XYZ etc. Recent 5 years by Belle • X(3872) → D*0 D 0 (B → X K) • X(3872) → J/y , y’ (B → X K) • Comparison of X(3872) in B+/0 → X K+/0 • JPC of X(3872) (B → J/y + - K) • (1 S/2 S) → X(3872) search • Zb(10610/50)+ → B*B(*) • Y(4260/4360) → J/y search (e+e- ISR) • X(new) → J/y search in B → X K • (5 S) → (1 D) + • JPC of Z(4430) + (B → y’ + K Ang. Dalitz) • (2 S) → b(1/2 S) [had. excl. ] search • JPC of Z(10610/50) + ( (5 S) → (n. S) + - Ang. Dalitz) • Rb and (n. S) + - scan • Z(4430) + → J/y + (B → J/y + K Ang. Dalitz) 7

Others on Hadron Physics e+ e- + • ISR → • ISR e+e- → Ds (*+) Ds(*-) • (1/2 S) → excl. light hadrons D 0 D*- Recent 5 years by Belle • → ff, fw [Res. structure] • → 0 • → ’ + - [(1760), X(1835)] • * → 0 Form Factor • (1/2 S) → H-dibaryon search • Xcc search • Xc* decays • e+e- → Inclusive strange/charmed Baryons 8

Charmonium(-like) States Above DD threshold “Exotics” S. Olsen’s talk Below DD threshold well described by Potential model 9

Bottomonium(-like) States Below BB threshold well described by Potential model 10

Yb: Y(4260) counter part Hadrons Large rate of Y(4260) → J/y + Anomalously large rates (5 S) → (n. S) + ~100 times larger than (1 -4 S) → (n. S) + Peak locations are Different ? 11

New Energy Scan 2010 May-June run ØFine Rb scan in m li y ar LLWI 2014 Hadrons e Pr Ø 16 new points for (n. S) + - 12

New Energy Scan LLWI 2014 Preliminary (6 S) II Y b’ ? 13

Exotic nature of “ (5 S) ” First Observation (5 S) → hb (n. P) + is not suppressed ~similar to (5 S) → (n. S) + [PRL 108, 032001 (2012)] Similar to enhance of hc + - at Y(4260) CLEO [PRL 107, 041803 (2011)] 14

Charged Bottomium-like Zb+ Zb(10610)+ & Zb(10650)+ [PRL 108, 122001 (2012)] ~all hb(n. P) + from Zb+ - Relative Phase of Zb’s ~180 o ~BB* & B*B* threshold Relative Phase of Zb’s ~0 o 15

IG : Neutral Partner of Zb [PRD D 88, 052016 (2013)] First observation of (5 S) → (n. S) 0 0 Rates: consistent with half of (5 S) → (n. S) + - Neutral partner in (5 S) → (n. S) 0 0 6. 5 significance mass 10609 4 4 Me. V IG = 1 + 16

JP of Zb(10610/10650)+ 6 D Angular and Dalitz analysis of (5 S) → (n. S) + [ar. Xiv: 1403. 0992. to PRD ] (2 ln. L) values Both: JP = 1+ (>6 ) (3 S) + Zb(10610)+ region 17

Zb(10610/10650)+ → B*B(*) BB BB* 9. 3 B*B* 5. 7 : Dominant decay Mode r a in B*B(*) Pr im l e Molecule [ar. Xiv: 1209. 6450 ] 18 y

Zb(10610/10650)+ Summary Molecular Interpretation • B*B(*) mode is dominant [Bonder et al. PRD 84, 054010(2011)] IG (JP) = 1+ ( 1+ ) 19

Zb Family Spectroscopy 20

Bonus of Exotics/Anomaly (1) Large (5 S) → Zb+ - → hb (n. P) + - Discovery of hb (n. P) g h b → b g Bottomonium study b First Evidence ! hb(2 P) → g b(2 S) 4. 2 w/ syst (2) Mmiss ( + - ) [PRL 109, 232002 (2012)] p. NRQCD LQCD Belle In agreement with theory (2 S) = 4 8 Me. V, < 24 Me. V @ 90% C. L. expect 4 Me. V 21

Bonus of Exotics/Anomaly (2) arxiv: 1205. 6351 hb(1 P) b(1 S) MHF(1 S) 3 Belle : 57. 9 2. 3 Me. V PDG’ 12 : 69. 3 2. 8 Me. V Ba. Bar (3 S) hb(2 P) b(1 S) b(1 P) ISR (1 S) b PRL 101, 071801 (2008) Ba. Bar (2 S) b(1 S) CLEO (3 S) p. NRQCD Ba. Bar (3 S) b(1 S) ISR (1 S) b LQCD PRL 103, 161801 (2009) (n) Mmiss ( + - ) [ PRL 109, 232002 (2012) ] Kniehl et al, PRL 92, 242001(2004) Meinel, PRD 82, 114502(2010) CLEO (3 S) Belle result decreases tension with theory +4. 0 +4. 5 Me. V First measurement = 10. 8 – 3. 7 – 2. 0 as expected PRD 81, 031104 (2010) 22

Extension to Strange quark (1) ISR e+e- → J/y + - [X(4260)] ; y’ + - [X(4360)] → f + Y(2175) m = 2079 13 79 28 Me. V = 192 23 21 61 Me. V Ba. Bar [PRD 74, 091103 (2006)] CLEO [PRL 100, 102003 (2008)] → f f 0(980) 673 fb-1 Y(2175) [PRD 80, 031101 (2009)] PDG: f(2170) m = 2175 15 Me. V = 61 18 Me. V 23

Extension to Strange quark (2) → J/y w [X(3915)] ; J/y f [X(4350)] →fw [PRL 108, 232001(2012)] ww →ff 870 fb-1 Ø Structures in low mass region 2 - 2. 3 Ge. V Ø JP of structures are extracted by angular distribution 24

Baryon production in e+e- [ M. Sumihama (Hadron 13), M. Niiyama(Morind QCD) ] 25

Belle Results: Strange Baryons Belle NPC [ M. Sumihama (Hadron 13), M. Niiyama(Morind QCD) ] 26

Belle Results: Charmed Baryons Lc Sc [ M. Sumihama (Hadron 13), M. Niiyama(Morind QCD) ] 27

Charmed Strange Bayons Xc First observation of Xc(3055)0 ! 980 fb-1 28

H-dibaryon Search (1 S, 2 S) decays World largest data samples tri-diquark Jaffe, PRL 38, 195 (1977) hypernucleus [PRL 110, 222002(2013)] 29

Summary u B-Factory offers excellent Laboratory for studies of Hadron physics u Exotic hadrons: started in 2003; X(3872) Many Charmonium-like exotic states observed Recently, extended to Bottomonium region and Strange quarkonium region Ø Progress on systematic understanding Exotics Ø Baryon studies: Strange, Charmed baryons Di-baryons Ø Still many analyses are on going / possible Ø More from LHC/LHCb and Super. KEKB/Belle II 30

Hypothetical Exotic States Pentaquark: S=+1 Baryon H-di. Baryon u d_ u d s tightly bound 6 -quark state Glueball s ud u ds Color-singlet multigluon bound state 0 Tetraquark mesons tightly bound diquark-diantiquark u _c c _u _ qq-gluon hybrid mesons c c u_ _ _ loosely bound meson-antimeson “molecule” D _ c u _ *0 D _ c 31

Observation of (4 S) → hb at Moriond QCD 32

JP of Zb(10610/10650)+ 34