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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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Megumi naruki kek

Megumi Naruki (KEK)

Hadron Physics Experiments at J-PARC- Current Status and Future Prospects


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

neutrino

J-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 Beams

Hadron 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


Hadron physics experiments at j parc current status and future prospects

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


Hadron physics experiments at j parc current status and future prospects

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


Hadron physics experiments at j parc current status and future prospects

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


Phase ii hall extension

Phase II : Hall Extension


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


Hadron physics experiments at j parc current status and future prospects

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


Power upgrade plan of sx

Power upgrade plan of SX


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)


Bakups

Bakups


Hadron physics experiments at j parc current status and future prospects

Spill Structure

EQ off

RQ Algorithm#3

Main Gain = 20

Int. Gain = 100

Shot#21025


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