Strange Pentaquarks Michał Praszałowicz M. Smoluchowski Inst. of Physics Jegellonian University,...
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Transcript of Strange Pentaquarks Michał Praszałowicz M. Smoluchowski Inst. of Physics Jegellonian University,...
Strange Pentaquarks
Michał Praszałowicz
M. Smoluchowski Inst. of Physics
Jegellonian University,
Kraków, Poland
Strange Pentaquarks
Michał Praszałowicz
M. Smoluchowski Inst. of Physics
Jegellonian University,
Kraków, Poland
9.12.2008 Michal Praszalowicz, Krakow 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
BaBar
CLAS-d2
BELLE
ALEPH, ZSVD2
LEPS-d2LEPS-C CLAS-d1
DIANA
SAPHIR
SVD2
COSY-TOF
Hermes
JINR
CLAS-p
LEPS-d
nBCZEUS
BES J,Y
CLAS g11
SPHINXHyperCP
HERA-B
FOCUS WA89CDF
: Positive result
: Negative result
2002 2003 2004 2005 2006 2007
DIANA
COSY-TOF
7.12.200 Michal Praszalowicz, Krakow 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
BaBar
CLAS-d2
BELLE
ALEPH, ZSVD2
LEPS-d2LEPS-C CLAS-d1
DIANA
SAPHIR
SVD2
COSY-TOF
Hermes
JINR
CLAS-p
LEPS-d
nBCZEUS
BES J,Y
CLAS g11
SPHINXHyperCP
HERA-B
FOCUS WA89CDF
: Positive result
: Negative result
2002 2003 2004 2005 2006 2007
DIANA
COSY-TOF
10
BELLE: secondary kaon beamfrom D decays interactingwith silicon in vertex detecor :
< 0.64 MeVR. Mizuk, Europhysics 2005, Lisbon. July 2005
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
BaBar
CLAS-d2
BELLE
ALEPH, ZSVD2
LEPS-d2LEPS-C CLAS-d1
DIANA
SAPHIR
SVD2
COSY-TOF
Hermes
JINR
CLAS-p
LEPS-d
nBCZEUS
BES J,Y
CLAS g11
SPHINXHyperCP
HERA-B
FOCUS WA89CDF
: Positive result
: Negative result
2002 2003 2004 2005 2006 2007
DIANA
COSY-TOF
positive result from LEPS (Japan) remains
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.C79:025210,2009. e-Print: arXiv:0812.1035
7.12.200 Michal Praszalowicz, Krakow 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
BaBar
CLAS-d2
BELLE
ALEPH, ZSVD2
LEPS-d2LEPS-C CLAS-d1
DIANA
SAPHIR
SVD2
COSY-TOF
Hermes
JINR
CLAS-p
LEPS-d
nBCZEUS
BES J,Y
CLAS g11
SPHINXHyperCP
HERA-B
FOCUS WA89CDF
: Positive result
: Negative result
2002 2003 2004 2005 2006 2007
DIANA
COSY-TOF
X
negative results from CLAS high statistics d runcontradicts previous CLAS analysisand contradicts LEPS
7.12.200 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
BaBar
CLAS-d2
BELLE
ALEPH, ZSVD2
LEPS-d2LEPS-C CLAS-d1
DIANA
SAPHIR
SVD2
COSY-TOF
Hermes
JINR
CLAS-p
LEPS-d
nBCZEUS
BES J,Y
CLAS g11
SPHINXHyperCP
HERA-B
FOCUS WA89CDF
: Positive result
: Negative result
2002 2003 2004 2005 2006 2007
DIANA
COSY-TOF
XX
negative results from CLAS high statistics runcontradiced previous experiments
7.12.2008 Michal Praszalowicz, Krakow 20
t-channel production of Q+
p Q+
K*
K0
n Q+
K*+
K-
p Q+
K0
K0
n Q+
K+
K-
7.12.2008 Michal Praszalowicz, Krakow 21
t-channel production of Q+
p Q+
K*
K0
n Q+
K*+
K-
p Q+
K0
K0
n Q+
K+
K-
known
? ?
7.12.2008 Michal Praszalowicz, Krakow 22
CLAS estimate
limits correspondingto the rangeof K* couplings
Main assumption
7.12.2008 Michal Praszalowicz, Krakow 23
Theta+ exists with M ~ 1540 MeVand total width ~ 1 MeV
What about other members of antidecuplet?
7.12.2008 Michal Praszalowicz, Krakow 26
hn measurement in D( ,g hn)p Kunznetsov et al. preprint (05)
hn hp
GRAAL:hn measurement: quasi-free kinematics
Is there a narrow resonance in nucleon excitation?
Properties of N*(1685)
Michal Praszalowicz, Krakow 29
η photoprodution depends on: Br x μtransition2
and is therefore dependent on model calculation of μtransition
Г > 1 MeV
Decay to pionis suppressed
Ver
y go
od c
andi
date
for
nu
cleo
n-lik
e m
embe
r of
antid
ecup
let
Decays of N*(1685) in SU(3) limit
Michal Praszalowicz, Krakow 31
Problem: in SU(3) limit decay to pion is 3 times larger than to eta
SU(3) flavor symmetry
N
N
Some trivial facts on SU(3) breaking
Exact SU(3)
N
N
N
Broken SU(3)
all masses equal GMO mass formulae
SU(3) flavor symmetry
N
N
Some trivial facts on SU(3) breaking
Exact SU(3)
N
N
N
Broken SU(3)
all masses equal GMO mass formulae
Decay of Theta+
Θ+ → K N Normal situation: large small large
Antidecuplet: small small large
CA
NC
ELLA
TIO
N !
„Roper octet”
1440****
1600 ***, 1660***
1690*** (spin=?,P=?)
N
GMO mass formula
works well
improvement possiblethrough additional
mixing
Summary
Michal Praszalowicz, Krakow 54
We still need a dedicated K+N formation experiment todecide 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