Hyperon-Proton Scattering Experiments at the J-PARC Background l - - PowerPoint PPT Presentation

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Hyperon-Proton Scattering Experiments at the J-PARC Background l - - PowerPoint PPT Presentation

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Hyperon-Proton Scattering Experiments at the J-PARC Background l Available data bubble chamber l SCIFI&IIT @ KEK Experimental Objectives at J-PARC l Experiments l Requests & Works l M. Ieiri (KEK) K. Imai (Kyoto U.)

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SLIDE 1

l

Background

l

Available data

— bubble chamber — SCIFI&IIT @ KEK

l

Experimental Objectives at J-PARC

l

Experiments

l

Requests & Works

Hyperon-Proton Scattering Experiments at the J-PARC

  • M. Ieiri (KEK)
  • K. Imai (Kyoto U.)
  • B. Bassalleck (U.ofNM)
  • P. Tlusty (NPI)

JSPS meeting, September 10, 2003

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SLIDE 2

Idea

1930 40 50 60 70 80 90 2000

Experiment ('32 neutron) ('47 π+ - meson)

  • •• pp, np

scattering (YN scattering) ('74 J/y) (Hypernuclei) E251, E289 E452

  • ••Yp@KEK

J-PARC Theory ('35 meson theory) '51hard-core OPE @long-range ('64 Quark hypothesis) OBE '77H-particle QCM Inspired by SU(3) (established) (established) established Support

Milestone

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SLIDE 3

—Ypscatt.atbubblechamberera'60-'70s—

No Data for X-p @ pX ≤ 1 GeV/c

@ 12 GeV KEK-PS since 1990 E251 S+p elastic [11 events] E289 S-p elastic [30 events] S+p elastic [in analysis] Lp elastic [in analysis] E452 S+p & Lp elastic [in analysis]

AvailableYNscatt.Data[1]

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SLIDE 4

AvailableYNscatt.Data[2]

  • 40
  • 20

20 40 100 50

  • 50
  • 100

(mm)

π- K+ S- S- p π-

Scintillating Fiber (or Liquid Scintillator) with IIT-CCD Camera triggered by Spectrometer system

IITs SciFi

Spectrometer Magnet Incident beam rate limit < 105 Hz

—Ypscatt.atthepresent12GeVKEK-PS:Method—

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SLIDE 5

lE251, E289 for ds/dW (S+p & S-p) lE452 for polarization (S+p & Lp)

AvailableYNscatt.Data[3]

cosqCM

Julich FSS 10 9 8 7 6 5 4 3 2 1

  • 1.0 -0.8 -0.6 -0.4 -0.2 0

0.2 0.4 0.6 0.8 1.0

S-p Æ S-p elastic

400 < PS- < 700 MeV/c

..

ds/dW (mb/sr) E251, E289 E289 E289 (E452) E289 E452

—Ypscatt.atthepresent12GeVKEK-PS:Results—

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SLIDE 6

ListofHyperon-protonscatterings

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SLIDE 7

M = a + c (sn

1+ sn 2) + b (sn 1- sn 2) + msn 1sn 2 + g(sP 1sP 2 + sK 1sK 2)

+h(sP

1 sP 2 - sK 1 sK 2)

I0Py = 1/4 Tr(MM†sn

1) = 2 Re[(a+m)c* + (a -m)b*]

( I0Ay

T = 1/4 Tr(Msn 2M†) = 2 Re[(a+m)c* - (a -m)b*] )

lS= - 2 lAnti-symmetric spin-orbit

27s 10a 10s 8a 8s 1a

S= 0 NN (T=1) S=-1 SN (T=3/2) SN-LN (T=1/2) S=-2 SS SS (T=2) XN-SL SL-SS SS (T=1) XN-SS SS -LL LL (T=0) S=-3 XS XS (T=3/2) XS XS-XL XL (T=1/2) S=-4 XX XX (T=1) S= 0 NN (T=0) S=-1 SN-LN (T=1/2) S=-2 XN-SL SL (T=1) S=-3 XS XS (T=3/2) S=-1 SN (T=3/2) S=-2 XN-SL SL-SS SS (T=1) S=-3 XS XS-XL XL (T=1/2) S=-4 XX XX (T=0) S=-1 SN-LN (T=1/2) S=-2 XN-SL SL (T=1) XN-SS SS -LL LL (T=0) S=-3 XS XS-XL XL (T=1/2) S=-1 SN-LN (T=1/2) S=-2 XN-SL SL (T=1) XN (T=0) S=-3 XS XS-XL XL (T=1/2) S=-2 XN-SS SS -LL LL (T=0)

… better to wait for E452 results

pp, pn, nn pn X-p X-p X-p X-p X-p X-p

ExperimentalObjectivesatJ-PARC

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SLIDE 8

S+pÆS+p

pS = 450 MeV/c

0.3 0.2 0.1

  • 0.10

30 60 90 120 150 180 30 60 90 120 150 180

qCM (deg)

1.0 0.5 0.0

  • 0.5
  • 1.0

LpÆLp

pL = 600 MeV/c

30 60 90 120 150 180

qCM (deg)

0.6 0.4 0.2

  • 0.2
  • 0.4

LpÆLp

pL = 600 MeV/c

CalculationbyModels

S=-2 X-p ÆLL, X ÆLL, X-pÆ X X-p

PS(q)

QCM(RGM-H) QCM(FSS) OBE(NSC) OBE(Julich B)

PL(q) DL(q)

Polarization observables ( ≈ Anti-symmetric spin-orbit)

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SLIDE 9

RequestforSecondaryBeamLineMomentum

Berge et al. Dauber et al. Burugun et al.

50 40 30 20 10

p(K-, K+)X-

1 1.5 2 2.5

Plab (GeV/c)

Î p(K-, K+)X- PK-:1.6~1.8GeV/c (K-/p->1) Î p(p+, K+)S+ Pp+:1.5~1.7GeV/c

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SLIDE 10

ExperimentalMethod

...basically, "double scattering" technique hyperon production reaction hyperon scattering , and hyperon decay

  • Vertex image detector

Scintillating Fiber at KEK since 1990 KEK-PS E251 for S+P E289 for S+p, S-p, Lp Liquid Scintillator KEK-PS E452 for S+p, Lp asymmetry

  • Liq. H2 + Cylindrical Drift Chamber

(developed by BNL E906 group)

X-p

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SLIDE 11

X-pscattering

K- K+ π- π- p p 5 kG

CDS

  • Size

radius 30 cm hight 60 cm

  • Solenoidal field

5 kG

  • Time resolution

150 ps

  • Pos. resolution

200 µm 20 cm

Magnet TOF WCs

25° 5m

K-pÆ K+X- X-pÆ X-p Lp- pp- X-p ÆLL pp- pp-

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SLIDE 12

Targetregion

K- K+ π- π- p p L L X- q_spectrometer 10 cm C B A

X-pÆ Æ LL LL

lTarget 5 cm wide ¥ 20 cm long A: production 1 cm

  • Liq. Hydrogen

B: degrader 0.5 cm Tungsten C: scattering 2 cm

  • Liq. Hydrogen

l K+ spectrometer q_spectrometer ~ 25° at center l K- beam (assumption @ LOI) Intensity 107 K-/sec Momentum 1.7 GeV/c Size s_horizontal 15 mm s_vertical 1 mm

100 400 800 1200 PX just before decay [MeV/c] Liquid Hydrogen Tungsten

Vertical position [mm]

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SLIDE 13

K1.8beamline

Primary beam line Production target

K1.8

K1.8 Experimental Area

lLength

42.35 m

lIntensity

0.7¥107 K-/s@50GeV (1.0¥107 K-/s@37.5m&50GeV) (0.9¥107 K-/s@37.5m&40GeV)

lSize@Liq.H2

trial tuning just downstream of MS2 sx = 8.8 mm sq = 16.8 mr sy = 2.4 mm sf = 3.6 mr

94 % of K- beam pass through Liq. H2

  • f 20cm long with 1cm thickness & 5cm width
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SLIDE 14

Yieldsestimation

1.0 0.5

  • 0.5
  • 1.0

200 400 600 800 1000 PX [MeV/c]

X-p Æ LL LL cosqCM

  • K- intensity

[s-1] 107

  • Number of Hydrogen

[/cm2] 8.5¥1023

  • Spectrometer

[deg] 25

  • Spectrometer TOF

[m] 5

  • Trigger rate (K+)

[s-1] 11

  • Momentum of X

X - [MeV/c] 300 - 1100

X-p Æ X-p X-p Æ LL Æ LL

  • reaction rate

[s-1] 0.009 0.0043

  • 100 days

78000 37000

  • Detectable number

2300 550

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SLIDE 15

S+p&Lp:Method

R&D needed for … lImaging device Improve rate limit 105 Hz 107 Hz lOnline trigger rate — (p, K) cut — Image brightness cut Assuming success of these R&D, … an estimation from KEK-E452 10000 S+p & Lp elastic @107 p+/sec , in 10 days

A high-speed gateable image pipeline

By Berkovski et. al. NIM A380(1996)537

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SLIDE 16

Requests&Works

lSeparated beam line around 1.5 - 1.8 GeV/c lK— intensity 107/sec with K/p > 1 lLiquid hydrogen facility lReview of E251, E289 & E452 @ KEK lRealistic Optimization of Setup lBackground estimation (physical & instrumental) lFast imaging device, Trigger consideration

for X-p(S=-2),S+p&Lp(Polarizationobs.)

———reasonablydoableatJ-PARC

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SLIDE 17

If… (in the beginning)

lK— intensity is low at around 106/sec lNo Liquid hydrogen facility

Scintillating Fiber Block for Xp/ tracking Tracking device like silicon-strip X Production target

X-p / 12C(K-,K+LL LL) experiments with imaging device

K— K+ X—

When…

lPolarized H2 target available

Measure Ay

T, DT

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SLIDE 18

E289S-psimulation&Proposal

l

Incidentπ-/spill 1.5x105 2x105

l

Shifts 80 100

l

Total π- 8.6x1010 14.4x1010

l

(π-, K+) S- 5.8x105 9.6x105 with vertex cut 2.8x105

l

S-p [from H] 70 240

l

Eye-scan ,kinematical 45

  • btained @E289

30 from H 68 from C&H