Elucidation of New Hadrons with a Variety of Flavors
Feb. 28-Mar. 1, 2011@RIKEN, Nishina Acc. Center
B01計画概論
Introduction toB01Project
the New Hadrons project,
Division B01
B01:異状な構造をもつバリオンの存在形態の解明
Elucidation of baryons with unusual
quark configuration
RCNP, Osaka U.
Hiroyuki Noumi for the B01 collaboration
Unusual quark configulation of Baryons?
Hadron Picture beyond (std)QM
8Be(0)+α
3α
JP,I,m,G,F(q)…
GS
GS
2
Organization
Leader
H. Noumi
Collaborative
T. Hotta
Researcher
Cooperative
S. Sawada
Researcher
RCNP, Osaka U.
overall
RCNP, Osaka U.
DAQ System
IPNS, KEK
Large Acceptance Detector System
C.R.
N. Muramatsu RCNP, Osaka U.
Photon Beam Upgrade (Laser system)
C.R.
M. Naruki
IPNS, KEK
Detector R&D
C.R.
C.R.
K. Tanida
M. Yosoi
Seoul Nat’l U.
RCNP, Osaka U.
Experiment with hadron beams
Detector R&D
C.R.
T. Nakano
RCNP, Osaka U.
Experiment with photon beams
C.R.
T. Yorita
RCNP, Osaka U.
Photon Beam Upgrade (beam line)
+ LEPS/LEPS-II Collaborators
Employees
Post Doc.
C. J. Yoon
Researcher
Technical
T. Sawada
Assistant (S) Y. Kon
RCNP, Osaka U.
Mar, 2010~
RCNP, Osaka U.
May, 2010~
Research Techniques and Topics
1. Laser Electron Photon experiment at SPring-8 (LEPS):
•
•
•
Conducting Hadron Spectroscopy with polarized photon beams
Upgrading photon beam intensity to enhance experimental efficiency.
Raising photon beam energy to expand hadron production channels and
achieve higher controllability on spin, isospin, and parity.
2. LEPS-II project:
•
•
•
M. Sumihama
Constructing a large acceptance hadron spectrometer system :
→ moving the E949 spectrometer at BNL to LEPS-II.
Developing a new high-speed data acquisition system to accommodate the
beam and detector upgrade.
Developing low emittance, high polarization, and high intensity photon beams for
LEPS-II project.
M. Yosoi
3. J-PARC:
•
Conducting production and decay spectroscopy experiments of Θ+ and Λ(1405)
utilizing low energy kaon beams at J-PARC.
HN
4
Budget
Item
FY2009
Purchase
Travel
Others
FY2010
Purchase
Travel
Others
FY2011
FY2012
FY2013
266nm-1W CW Laser System, Optical Parts
Oscilloscope, etc.
BNL, etc.
Expenditures, etc.
266nm-1W CW Laser System,
GM refrigerators(for Liq.D2), Drift chamber, etc.
BNL, etc.
Expenditures, etc.
FADC65MHz(62:2790), FADC500MHz(15:570);
Multihit TDC(12:780), CPU(10:250), ATCA(5:400);
SSDs(28:1680);
PMTs(>48:>1920); TOP?(480);
TPC(1:2900); TPC-Amps(153:2295);
to be suppressed (~70%)
Hadron Spectroscopy at J-PARC
L(1405)
L(1520), 3/2S*(1385),
3/2+
L(1405), 1/2-
KN(1432)
-27 MeV
S(1192), 1/2+
L(1116), 1/2+
6
LEPS:
M. Niiyama et al., PRC78, 035202(2008)
I. Zychor et al. PLB660, 167(2008)
Eg=
1.5-2.4 GeV
COSY-ANKE: pp→pK+L*(→p0S0)
pK=673~834 MeV/c
K-d -> p+S-n(Bubble C.)
1420 MeV/c2
CLAS:
K. Moriya et al., NPA835, 325(2010)
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O. Braun et al., NPB129, 1(1977)
L(1405) Spectroscopy via the (K-,n) reaction on 2H
What do we measure?
K-
KbarN scattering below KbarN threshold
d
Employ d(K-,n)L*
n
K
S
Ideal to form the L* directly coupled to KbarN.
p
Enhancement of L* production at qn=0
BG from S* will be much reduced.
Possible ID of an I=0 amp. in KbarN -> pS
S-wave, I=0 → L*（1405） → p0S0 , p+/-S-/+
S-wave, I=1 → non-resonant
→ p0L, p+/-S-/+
P-wave, I=1 → S*（1385）
8
L(1405) Spectroscopy via the (K-,n) reaction on 2H
2H(K-,p)S*KL*
CDS
n
Ushiwaka
K-, 1 GeV/c
pp
(->S-p+)
TOF~15m
n
p+ (p-)
L*->S+p-
n, 1.0~1.5
GeV/c
p-
p
L*->S0p0
p- (p+)
S*->Lp0
p, 1.0~1.4
GeV/c
H. Fujioka
(BG)
9
Detection of the L* -> p-S+ and p+S- modes
p+ (p-)
Solenoid Field
at 5 kG
p+ (p-)
p- (p+)
1.5m
L*->S+p(->S-p+)
p- (p+)
10
Backward Proton Detectors for the L* -> p0S0 mode
pSolenoid Field
at 5 kG
p
pp
L*->S0p0
momentum measurement by TOF with BPD
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Backward Proton Detectors
p
-
BPD(MPPC)
Z-TPC
p
target
Λ
KBLC
K-
BPC
(XX’YY’XX’YY’)
n
MPPC
p
3×3mm12
BPD:Plastic Scintillator Hodoscopes （TOF＠B=0.5Tesla）
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Prospects
Towards Stage-2 Approval：
Proton Detector R&D for p0S0Mode
BPD forTOF (σ~250ps) by S. Enomoto（RCNP）
→Scintillator Hodoscopes＋MPPC
BPC for Tracking by K. Inoue（RCNP）
→Compact MWDC
Liq. D2 TGT by M. Iio（RIKEN）
System for ３He(E15) can liquify D2 (Inefficient)
→D2 TGT w/ GM ref.
＋Safety Inspection is required.
Schedule：
2011.4：E17 Exp.
2011.7 Stage-2 Approval
2011.Autumn~：E15 starts: E31 Eng. Run starts.