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Strange Pentaquarks Michał Praszałowicz

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2 Strange Pentaquarks Michał Praszałowicz
M. Smoluchowski Inst. of Physics Jegellonian University, Kraków, Poland

3 Strange Pentaquarks Michał Praszałowicz
M. Smoluchowski Inst. of Physics Jegellonian University, Kraków, Poland

4 ~1540

5 Time dependent experimental status of Q+
γ + d (n )　reactions γ + p → p Ks0　 γ + p → n K+ K- + K + (N) → p Ks0 lepton + D, A → p Ks0 p + A → pKs0 + X p + p → pKs0 + S+ Other Q+ Upper Limits LEPS-C CLAS-d1 LEPS-d LEPS-d2 CLAS-d2 SAPHIR CLAS g11 DIANA CLAS-p BELLE DIANA ZEUS nBC BaBar Hermes SVD2 JINR SPHINX HyperCP SVD2 ALEPH, Z COSY-TOF COSY-TOF HERA-B BES J,Y CDF FOCUS WA89 : Positive result : Negative result Michal Praszalowicz, Krakow

6 Ideal experiment

7 Formation cross section
Breit-Wigner cross-section (GM + MP) K+ n 1/2 1/2 1/ /2

8 Time dependent experimental status of Q+
γ + d (n )　reactions γ + p → p Ks0　 γ + p → n K+ K- + K + (N) → p Ks0 lepton + D, A → p Ks0 p + A → pKs0 + X p + p → pKs0 + S+ Other Q+ Upper Limits LEPS-C CLAS-d1 LEPS-d LEPS-d2 CLAS-d2 SAPHIR CLAS g11 DIANA CLAS-p BELLE DIANA ZEUS nBC BaBar Hermes SVD2 JINR SPHINX HyperCP SVD2 ALEPH, Z COSY-TOF COSY-TOF HERA-B BES J,Y CDF FOCUS WA89 : Positive result : Negative result Michal Praszalowicz, Krakow

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10 BELLE: secondary kaon beam from D decays interacting
with silicon in vertex detecor :  < 0.64 MeV R. Mizuk, Europhysics 2005, Lisbon. July 2005

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12 Time dependent experimental status of Q+
γ + d (n )　reactions γ + p → p Ks0　 γ + p → n K+ K- + K + (N) → p Ks0 lepton + D, A → p Ks0 p + A → pKs0 + X p + p → pKs0 + S+ Other Q+ Upper Limits LEPS-C CLAS-d1 LEPS-d LEPS-d2 CLAS-d2 SAPHIR CLAS g11 DIANA CLAS-p BELLE DIANA ZEUS nBC BaBar Hermes SVD2 JINR SPHINX HyperCP SVD2 ALEPH, Z COSY-TOF COSY-TOF HERA-B BES J,Y CDF FOCUS WA89 positive result from LEPS (Japan) remains : Positive result : Negative result

13 T. Nakano (Osaka) Evidence of the Theta+ in the gamma d ---> K+ K- pn reaction. By LEPS Collaboration (T. Nakano et al.). Published in Phys.Rev.C79:025210, e-Print: arXiv:

14 Michal Praszalowicz, Krakow
Michal Praszalowicz, Krakow

15 MMgK- (GeV) T. Hotta, Acta Phys. Pol. B36, 2173

16 Time dependent experimental status of Q+
γ + d (n )　reactions γ + p → p Ks0　 γ + p → n K+ K- + K + (N) → p Ks0 lepton + D, A → p Ks0 p + A → pKs0 + X p + p → pKs0 + S+ Other Q+ Upper Limits X LEPS-C CLAS-d1 LEPS-d LEPS-d2 CLAS-d2 SAPHIR CLAS g11 DIANA CLAS-p BELLE DIANA ZEUS nBC BaBar Hermes SVD2 JINR SPHINX HyperCP SVD2 ALEPH, Z COSY-TOF COSY-TOF HERA-B BES J,Y CDF FOCUS WA89 negative results from CLAS high statistics d run contradicts previous CLAS analysis and contradicts LEPS : Positive result : Negative result Michal Praszalowicz, Krakow

17 Comparison of LEPS and CLAS
Michal Praszalowicz, Krakow

18 Comparison of LEPS and CLAS
Michal Praszalowicz, Krakow

19 Time dependent experimental status of Q+
γ + d (n )　reactions γ + p → p Ks0　 γ + p → n K+ K- + K + (N) → p Ks0 lepton + D, A → p Ks0 p + A → pKs0 + X p + p → pKs0 + S+ Other Q+ Upper Limits X LEPS-C CLAS-d1 LEPS-d LEPS-d2 CLAS-d2 X SAPHIR CLAS g11 DIANA CLAS-p BELLE DIANA ZEUS nBC BaBar Hermes SVD2 JINR SPHINX HyperCP SVD2 ALEPH, Z COSY-TOF COSY-TOF HERA-B BES J,Y CDF FOCUS WA89 negative results from CLAS high statistics run contradiced previous experiments : Positive result : Negative result Michal Praszalowicz, Krakow

20 t-channel production of Q+
K* K0 n Q+ K*+ K- p Q+ K0 n Q+ K+ K- Michal Praszalowicz, Krakow

21 t-channel production of Q+
K* K0 n Q+ K*+ K- ? ? p Q+ K0 n Q+ K+ K- known Michal Praszalowicz, Krakow

22 Michal Praszalowicz, Krakow
CLAS estimate limits corresponding to the range of K* couplings Michal Praszalowicz, Krakow

23 Michal Praszalowicz, Krakow
Main assumption Theta+ exists with M ~ 1540 MeV and total width ~ 1 MeV What about other members of antidecuplet? Michal Praszalowicz, Krakow

24 Michal Praszalowicz, Krakow
~1540 1647 ? 1754 ? NA 49 NA 61 1861 ? Michal Praszalowicz, Krakow

25 Michal Praszalowicz, Krakow
~1540 Michal Praszalowicz, Krakow

26 Is there a narrow resonance in nucleon excitation?
GRAAL: hn measurement: quasi-free kinematics hn measurement in D(g,hn)p Kunznetsov et al. preprint (05) hn hp Michal Praszalowicz, Krakow

27 eta photoproduction on nucleon
Michal Praszalowicz, Krakow

28 Hints from PWA (Arndt, Azimov, Polyakov, Workman) STAR (Kabana....)

29 Michal Praszalowicz, Krakow
Properties of N*(1685) Very good candidate for nucleon-like member of antidecuplet Decay to pion is suppressed Г > 1 MeV η photoprodution depends on: Br x μtransition2 and is therefore dependent on model calculation of μtransition Michal Praszalowicz, Krakow

30 Decay widths SU(3) relations = reduced matrix element × SU(3) Clebsch

31 Decays of N*(1685) in SU(3) limit
Problem: in SU(3) limit decay to pion is 3 times larger than to eta Michal Praszalowicz, Krakow

32 Solution: mixing

33 SU(3) flavor symmetry Some trivial facts on SU(3) breaking
Broken SU(3) Exact SU(3) all masses equal GMO mass formulae

34 SU(3) flavor symmetry Some trivial facts on SU(3) breaking
Broken SU(3) Exact SU(3) all masses equal GMO mass formulae

35 Mixing mixing with ground state octet α the same for N and Σ

36 Decay of Theta+ Θ+ → K N

37 Decay of Theta+ Θ+ → K N Normal situation: large small large
CANCELLATION ! Antidecuplet: small small large

38 Chiral Quark Soliton Model
In large Nc non-relativistic limit:

39 Low lying J+ baryon multiplets

40 Mixing with „Roper ocet”
mixing with „Roper octet” φ the same for N and Σ

41 „Roper octet” GMO mass formula works well improvement possible
through additional mixing 1440**** 1600 ***, 1660*** 1690*** (spin=?,P=?)

42 Decays of N10(1685) mixing with the Roper octet

43 Constraining mixing angles

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45 Decays of N10(1685) branching rats.along the orange line

46 Michal Praszalowicz, Krakow
Properties of Σ10 and Ξ10 dashed = GMO Michal Praszalowicz, Krakow

47 Michal Praszalowicz, Krakow
Properties of Σ10 and Ξ10 NA 49 (1860) excluded Michal Praszalowicz, Krakow

48 Michal Praszalowicz, Krakow
~1540 1647 ? 1685 1754 ? ~1815 1861 ? ~1935 Michal Praszalowicz, Krakow

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52 Michal Praszalowicz, Krakow
Properties of Σ10 Michal Praszalowicz, Krakow

53 Michal Praszalowicz, Krakow
Properties of Ξ10 Michal Praszalowicz, Krakow

54 Michal Praszalowicz, Krakow
Summary We still need a dedicated K+N formation experiment to decide existence of Theta+ If Theta+ exists and has total width ~ 1 MeV: new narrow resonance N(1685) can be interpreted as a member of antidecuplet only if mixing is included we propose to consider mixing of antidecuplet with Roper and ground state octets (Roper does not decay to eta N) SU(3) forbidden decay of N(1685) to πΔ is 20 – 65 % fixing mixing angles from N(1685) we calculate masses and partial widths of antidecuplet Sigma M ~ 1815 MeV, decays: KN 60% and πΛ 20%, Г~10-30 MeV antidecuplet Xi ~1935 (contradicts NA 49), Г~10 MeV Michal Praszalowicz, Krakow

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