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Megumi Naruki (KEK). Hadron Physics Experiments at J-PARC - Current Status and Future Prospects. Contents. Overview of J-PARC Hadron Facility Facility & Physics Programs Current Status beam commissioning spectrometer performance S earch for Pentaquark Q + in Hadronic Reaction

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contents
Contents
  • Overview of J-PARC Hadron Facility
    • Facility & Physics Programs
  • Current Status
    • beam commissioning
    • spectrometer performance
  • Search for PentaquarkQ+ in Hadronic Reaction
    • J-PARC E19 experiment : p–pK–X
    • Future Plan
      • other pentaquarks, tetraquarks
j parc bird s eye view
neutrinoJ-PARCbird’s-eye view

400MeV

LINAC

3GeV PS (RCS)

n

Materials &Life Science Facility

50GeV PS (MR)

slow extraction section

Hadron Experimental Facility

nuclear hadron physics at j parc
multi-strangeness

hypernuclei

PentaquarkQ+

d

s

Nuclear & Hadron Physics at J-PARC

u

L,X

u

d

double-L

Exotic Hadrons

Strangeness Physics

K− atom

f

SKS

L6LHe

K1.8

KL

nuclei

K1.8BR

K1.1

X ray

High momentum

K1.1BR

f(1020)

kaonic atom

Origin of Hadron Mass

kaonic nuclei

hadron experimental facility
High Intensity Kaon BeamsHadron Experimental Facility
  • pmax = 1.1 GeV/c
  • IK~106ppp
  • Large Exp. Area

K1.8BR

K1.8

Production Target

Loss of 30%

  • pmax= 2.0 GeV/c
  • IK~106ppp
  • Double-stage
  • Electrostatic Separators

proton

KL

K1.1BR

  • primary proton
  • pmax = 51 GeV/c
  • Ip~109~12ppp

high momentum

  • pmax = 0.8 GeV/c
  • IK~106ppp
slide7
s

u

Double-Strangeness Hypernuclei

J-PARC E05 Experiment

high intensity kaon beam (K1.8) + SKS spectrometer

Ξ-(dss)

K-

K+

Expected Spectrum

Ξ-hypernuclei

nuclei

12C

  • discovery of X-hypernculei
  • X-nucleus interaction
    • structure of the neutron star
    • explore multi-strangeness hadronic systems

s

u

green: X-nucleus potential = 20MeV

magenta: X-nucleus potential = 14MeV

slide8
T. Hiraiwa, Parallell A1, Friday

proton

L

p-

proton

A search for deeply bound kaonic nuclear states by in-flight 3He(K-,n) reaction

J-PARC E15 Experiment @ K1.8BR

prediction for nucleon density distribution by AMD

r ~ 10r0 :

extremely dense system

A.Dote et al., PRC70 (2004) 044313.

  • Does the deeply bound state really exists?

neutron

3He

K-pp

K-

Missing mass

Spectroscopyvia neutron

Invariant mass

reconstruction

decay

clarify the kaon nucleus interaction quantitatively

origin of hadron mass j parc e16
u

u

d

Origin of Hadron Mass - J-PARC E16 -

In Hot/Dense Matter

In Vacuum

spontaneous breaking of chiral symmetry

u

u

d

Current quarks ~ 5 MeV/c2

Hadrons ~ 1000 MeV/c2

Constituent quarks ~ 300 MeV/c2

 vector meson mass in nuclear matter

e-

φ

proton

e+

nuclear target(p,C,Pb)

high momentum beamline + E16 Spectrometer

beam requests from stage 2 experiments
Beam Requests from Stage-2 Experiments

30 GeV, 9μA = 270 kW, 2 x 1014 protons/3.6s

K1.8 (SKS)

beam requests from stage 2 experiments1
Beam Requests from Stage-2 Experiments

30 GeV, 9μA = 270 kW, 2 x 1014 protons/3.6s

K1.8BR

KL

milestone
Milestone
  • First Beam Extraction2009/1/27
  • First Kaon Beam 2009/3
  • Completion of K1.8 beamline 2009/10
  • Construction of K1.1BR beamline
  • high momentum beamline?
  • Extension of Hadron Hall ??
the first shot 2009 1 27
1 (q01in)

2 (q02in)

5 (q11in)

6 (T0in)

9 (Dump in)

3 (v04in)

4 (V06in)

7 (q1Aout)

8 (T1in)

The First Shot 2009/1/27
milestone1
Milestone
  • First Beam Extraction2009/1/27
  • First Kaon Beam 2009/3
  • Completion of K1.8 beamline 2009/10
  • Construction of K1.1BR beamline
  • high momentum beamline?
  • Extension of Hadron Hall ??
the first kaon at j parc
The First Kaon at J-PARC

time difference between p & K ~ 2.4nsec (Expected: 2.3 nsec @ 1.1 Gev/c

e++m++p+:K+ ~ 9000:40 (Expected : p+:K + ~ 540:1 @ 1.0 GeV/c)

 Identify K + on TOF the spectrum

Beamline Tuning @K1.8BR 2009/2

By T. Suzuki

milestone2
Milestone
  • First Beam Extraction2009/1/27
  • First Kaon Beam 2009/3
  • Completion of K1.8 beamline 2009/10
  • Construction of K1.1BR beamline
  • high momentum beamline?
  • Extension of Hadron Hall ??
purity yield at kaons @ k1 8
– Purity & Yield at Kaons @ K1.8

TOF of beam particle in “K” trigger

p-

ES1/ES2 OFF

K-

20.5%

p

ES1 ON

ES2 OFF

38.5%

K- : 7k/2.5E+12 ppp

K+ : 40k/2.5E+12 ppp

ES1/ES2 ON

83.4%

consistent with design value

8% in non-biased trigger

*still rough tuning

K/p will be much more improved

milestone3
Milestone
  • First Beam Extraction2009/1/27
  • First Kaon Beam 2009/3
  • Completion of K1.8 beamline 2009/10
  • Construction of K1.1BR beamline
  • high momentum beamline?
  • Extension of Hadron Hall ??

now

slide19
South part

North part

KL

SKS

High Momentum

K1.8BR

K1.1BR

milestone4
Milestone
  • First Beam Extraction2009/1/27
  • First Kaon Beam 2009/3
  • Completion of K1.8 beamline 2009/10
  • Construction of K1.1BR beamline
  • high momentum beamline?
  • Extension of Hadron Hall ??

now

high momentum beamline
High Momentum Beamline

SM1: branched by 5°

Vertical Bend

3.9°

5.8°x3

Experimental Area

beam dump

e19 experiment
E19 experiment

K1.8BR

K1.8

K1.1BR

proton

KL

production mechanism
PRL 96, 042001 (2006)Production Mechanism

consistent with each other: since there is strong angle / energy dependence.

it implies a very small coupling to K*. gNK*Q+ ∼ 0

Q+ production in hadronic reaction

CLAS

PRL 92 032001 (2004)

g

p+

  • small angle dependence
  • inverse proportion to energy

p-

K-

K+

n

proton

Q+

cf: g p →p+ K- K+ (n)

n

kek ps e522 experiment
KEK-PS E522 experiment

if exist

pp=1.92 GeV/c

  • Q+ search via p–pK–X
    • K2 beamline + KURAMA
  • beam momentum : 1.87, 1.92 GeV/c
  • target : Polyethylene
  • intensity : 3.3 X 105p– /spill
  • beam time : 32 hours for each momentum  ~ 7 X 109p-
  • Mass resolution : 13.4MeV(FWHM)

a bump was observed

at M =1530.8MeV/c2

at pp=1.92 GeV/c

but : S/N = 2.5s

upper limit : ds/dW < 2.9mb/sr

ds/dW= 1.9 mb/sr

 stot= 2.9 mb

j parc e19 experiment
Magnetic Field: 2.4T

Acceptance : 0.1sr

Weight : 300 tons

J-PARC E19 experiment
  • K1.8 beam line + SKS
  • 2GeV/c p- +p  K- + Q+
  • target : liquid H2, reuse E559’s
  • SKS :
    • momentum coverage : 0.7-0.95GeV/c
    • angle coverage ≤ 20°
    • pscatteredup to ~ 1.1 GeV/c
    • dp/p ~ 0.2% @ 1GeV/c
  • (~5 times better thanKURAMA)
    • DM =2.5MeV FWHM
  • ideal for Q+ detection

K-

2GeV/c p-

expected missing m ass spectrum
Expected Missing Mass Spectrum

1.9b/sr

KEK PS E522

significance : 62s assuming

G < 2MeV

s = 1.9mb

sensitivity

75nb/sr

slide28
SKS Spectrometer

Q13

Q12

K1.8 BeamSpectrometer

D4

Q11

Q10

spectrometer performance
Spectrometer Performance

S-

p(p-,K+)S- @1.25GeV/c

Target: Liq-H2(0.86g/cm2 )

(750k/spill x 18hour)

  • Expected:
  • Dp/p(Beam) = 3.3x10-4(FWHM)
  • Dp/p(SKS) = 4.5x10-3(FWHM)

Measured:

DM = 1.66±0.05 MeV (FWHM)

DpSKS ~3.3 MeV/c (FWHM)@ 0.7 GeV/c

ready for E19!

M = 1.201 GeV(1.1974 GeV)

for p(p-, K-)Q+ @1.92 GeV/c : DM ~1.76 MeV

in future
In FUTURE…
  • other pentaquarks: cascade X5--(1862) , charmed Q0c(3100)
    • K-nX--K+, pth=2.4GeV
    • ppppQ0cX, pth=12.3GeV
  • tetraquark: Q+(udss) , Q+ “family”
    • Y. KANADA-En’yo et. al. : Jp=1+ , M=1.4GeV, G=20~50MeV, Q+K+K+p-
    • Burns et al. : Jp=1- , M=1.6GeV, G<100MeV
    • Karliner & Lipkin : Jp=0+
      • K+pK+pQ+ X pth=3.7GeV
      • K+pLQ+ X pth=2.8GeV
      • K+pS+Q+pth=3GeV
high momentum secondary beams at high p beam line
High momentum secondary beams at high-p beam line

SM1: branched by 5°

Vertical Bend

3.9°

5.8°x3

  • Secondary Beams:
    • Use a thin (2% = 15kW loss) target at SM1
    • Collect them at forward angles
    • Transport them for ~120m
summary
Summary
  • Current Status
    • K and p Yield is consistent with the expectation
    • Spectrometer performance is good enough to reach the expected sensitivity.
  • J-PARC E19 searches for Q+ in p–pK–Q+raction
    • K1.8 beamline + SKS is ideal for Q+
    • significance ~60s, sensitivity ~75nb/sr
    • with mass resolution of 2.5MeV(FWHM)
slide36
Spill Structure

EQ off

RQ Algorithm#3

Main Gain = 20

Int. Gain = 100

Shot#21025

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