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with high-momentum hadron beams K. Shirotori for the E50 - - PowerPoint PPT Presentation

Jul 05, 2023 221 likes •473 views

Hadron spectroscopy with high-momentum hadron beams K. Shirotori for the E50 collaboration Research Center for Nuclear Physics (RCNP) Osaka University The 3rd J-PARC symposium (J-PARC2019) 26 th September 2019 2 Contents Motivations of

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SLIDE 1

Hadron spectroscopy with high-momentum hadron beams

  • K. Shirotori

for the E50 collaboration Research Center for Nuclear Physics (RCNP) Osaka University

The 3rd J-PARC symposium (J-PARC2019) 26th September 2019

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SLIDE 2

Contents

  • Motivations of hadron physics
  • Effective degree of freedom of hadrons
  • Hadron property in medium
  • J-PARC Facility
  • J-PARC high-momentum beam line
  • Multi-purpose spectrometer system
  • K10 beam line and Hadron hall extension
  • Summary

2

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SLIDE 3

Motivations of Hadron Physics

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SLIDE 4

Hadron physics investigations

  • Excited states
  • Effective degree of freedoms
  • Constituent quark + Diqaurk correlation & Hadron molecule

⇒ Spectroscopy experiment with heavy quark

  • Excites energy, spin and parity, production cross section, decay branching ratio
  • Properties in nuclear medium
  • Origin of mass
  • Spontaneous breaking of chiral symmetry

⇒ Measurement on nuclear target

  • Change of mass, shape, decay branching ratio, cross section

＊J-PARC: High-intensity Secondary Hadron beams

4

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SLIDE 5

Excited states: Observation of exotic hadrons

＊Excited states: Rich properties ⇒ Mass, width, decay branching ratio, spin and parity from new effective degree of freedoms extended to ordinary constituent quark model

5

Constituent quark

q q q ͞q q

Exotic hadrons

q q q ͞q q

Meson Baryon Hadron molecule Multi-quark

q q q ͞q q

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SLIDE 6

Excited states: Observation of exotic hadrons

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Constituent quark

q q q ͞q q

Exotic hadrons

q q q ͞q q

Meson Baryon Hadron molecule

q-q q

Diquark correlation & Hadron molecule

Diquark correlation Multi-quark

q q q ͞q q

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SLIDE 7

Excited states with heavy quark: Diquark

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“Excited mode”: l and r modes in heavy baryon excited states (q-q + Q system) ⇒ Diquark correlation: q-q isolated and developed

Q q-q Q q-q q q q

l mode

Corrective motion btw q-q and Q

G.S. Excited states by spin-spin interaction ⇒ Observables

Light quark baryon

r mode

Excitation of q-q

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SLIDE 8

Excited states with heavy quark: Diquark

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“Excited mode”: l and r modes in charmed baryon excited states (q-q + system) ⇒ Diquark correlation from Production rate and Decay branching ratio

c

q-q

c

q-q q q q

l mode

Corrective motion btw q-q and Q

G.S. Excited states by spin-spin interaction ⇒ Observables

Light quark baryon

r mode

Excitation of q-q

Charmed baryon spectroscopy experiment: J-PARC E50 ＊p- + p → Yc

*+ + D*- reaction @ 20 GeV/c

  • High-intensity p- beam: 6.0×107 /spill
  • Production rates & Decay branching ratios
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SLIDE 9

Production rates by hadronic reaction

9

  • p- + p → Yc

*+ + D*- reaction: Missing mass method

＊Production rates ⇔ Internal structure of excited states ⇒ Selective production of corrective motion: l mode

＊Angular momentum transfer between diquark (q-q) and charm quark

Reaction diagram

Lc @ 1 nb Lc(2595) Lc(2625) Sc(2800) Lc(2940) Sc(2455) Sc(2520) Lc(2880)

Simulation

S.H. Kim, A. Hosaka, H.C. Kim, H. Noumi, K. Shirotori

  • Prog. Theor. Exp. Phys. 103D01 (2014).

i eff f

r q i R    ) exp( 2 ~  

  • ＊Production cross section

⇒ Overlap of wave function ＊charm and q-q (spectator)

1 : 2 3 : 2

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SLIDE 10

Excitation spectrum: q-q + Q

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Strange baryons

100 200 300 400 500 600 700 800 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

Y* - YG.S. [MeV] MQ [MeV/c2]

Sc(1/2+) Lc(1/2+) Sc(3/2+) Lc(1/2-, 3/2-) Lc(1/2-, 3/2-, 5/2-)

l r r

L(1/2-, 3/2-, 5/2-) S(1/2+) L(1/2+) S(3/2+)

Charmed baryons

P-wave states

s c

L(1/2-, 3/2-) L(1/2-, 3/2-) Lc(1/2-, 3/2-)

  • Non-rel. QM: H = H0 + Vconf + VSS + VLS + VT
  • l-r mixing

(cal. By T. Yoshida, Nucl.Phys. A954 (2016) 341)

＊Heavy quark sector (charm) ⇒ Light quark sectors (u, d, s)

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SLIDE 11

Strange baryon systems

  • L* /S* : q-q + Q system

⇒ Systematics with charmed baryon

  • Production rate: l and r selection
  • Decay branching ratio
  • X* : q + QQ system

⇒ Excitation with two heavy quarks

  • W* : QQQ system

⇒ Same weight of three heavy quarks ＊Spectroscopy by high-momentum K- beam

  • Several GeV/c beam
  • Poor data of X and W states
  • Exotic states

⇒ Systematic measurement

11

Q q-q q Q Q Q Q Q

X* W* L*/S*

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SLIDE 12

Hadron in nuclear medium

  • Properties in finite density
  • Origin of hadron mass

⇒ Vector mesons

  • Quark condensation: <qqbar>

＊Different mesons: Different aspect on QCD vacuum

  • Experimental signals on nuclear target
  • Mass spectrum: Shift & Shape change
  • Decay branching ratio
  • Production cross section
  • A-dependence
  • Quark configuration: Light and heavy quarks

12

h/h’

f/w/r

＊Mass shift in medium Chiral origin ~ Constituent mass UA(1) anomaly + SBCS ＊Spontaneous breaking

  • f chiral symmetry
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SLIDE 13

Experimental approaches

  • DDbar production at threshold region
  • c/cbar: No effect
  • q/qbar: Change of mass

⇒ Cross section in medium

  • pbar + p → D + Dbar

⇔ pbar + A → D + Dbar + X

＊Effects to q/qbar w/o other light quarks

  • Charmonium states

⇒ Access to gluon condensation

  • Mass shape (Production cross section)
  • Decay branching ratio

⇒ Suppression of decay modes

  • pbar + A → M(ccbar) + X
  • Ex. M(ccbar) → DDbarmode forbidden

＊High-momentum pbar beam on nuclear target

  • Several GeV/c beam
  • Fixed target experiment

13

T [GeV]

  • Gy. Wolf at al., PLB 780, 25-28, 2018

D ≠ Dbar

Mass reduction Mass gain

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SLIDE 14

Question to hadron/nuclear physics

  • Neutron star: High-density nuclear matter
  • Quark・Gluon → Hadron → Hadron interaction → Nucleus → Neutron Start

＊Hadron properties: Effective degree of freedom, origin of mass

  • Roles of light quarks (u, d, s) from studies of heavy quark (charm) @ J-PARC

14

Nucleus Neutron star 104 m 10-14 m Quark・Gluon

q q q

Hadron Effective degree of freedom and origin of mass

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SLIDE 15

J-PARC Facility

High-momentum beam line Hadron hall extension: K10 beam line

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SLIDE 16

High-momentum beam line for 2ndary beam

  • High-intensity beam: > 1.0×107 Hz p (< 20 GeV/c)
  • Unseparated beam: p/K/pbar
  • High-resolution beam: Dp/p ~ 0.1%(rms)
  • Momentum dispersive optics method

16

Collimator Production Target (SM)

  • Exp. Target (FF)

Focal Point (IF)

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SLIDE 17

High-momentum beam line for 2ndary beam

  • High-intensity beam: > 1.0×107 Hz p (< 20 GeV/c)
  • Unseparated beam: p/K/pbar
  • High-resolution beam: Dp/p ~ 0.1%(rms)
  • Momentum dispersive optics method

17

  • Size: 100 mm×100 mm
  • 1 MHz / 1 mm
  • 6.0×107 /spill (30 MHz)

@ 20GeV/c 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 1.0E+09 2 4 6 8 10 12 14 16 18 20

[GeV/c]

Design Intensity [/spill (5.2 sec)] p+ K+ p- K- pbar p Several 107 /spill Several 105 /spill @ 15 kW loss ~100 mm

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SLIDE 18

Charmed baryon spectrometer

18 2m

LH2-target

Beam p- p- K+ ps

  • Ring Image

Cherenkov Counter DC TOF wall PID counter Fiber tracker T0 Pole face detector Internal DC Internal TOF Fiber wall

p- p+

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SLIDE 19

Charmed baryon spectrometer

19 2m

LH2-target

Beam p- p- K+ ps

  • Ring Image

Cherenkov Counter DC TOF wall PID counter Fiber tracker T0 Pole face detector Internal DC Internal TOF Fiber wall

p- p+

Large Acceptance Multi-Purpose Spectrometer + Trigger–less DAQ system Charmed baryon spectrometer ⇒ New platform for Hadron experiment

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SLIDE 20

Beam intensity for K and pbar experiment

  • Several GeV/c beam for X*/W*, DDbar and charmonium
  • > 1 MHz K/pbar beam ⇔ > 100 MHz p beam
  • Beam measurement is bottleneck. ⇒ Dedicated K/pbar beam line

20

1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 1.0E+09 2 4 6 8 10 12 14 16 18 20

[GeV/c]

Design Intensity [Hz] in spill (2.0 sec) p- K- pbar @ 15 kW loss

0.E+00 5.E-03 1.E-02 2.E-02 2.E-02 2 4 6 8 10 12 14 16 18 20

[GeV/c]

K/p & pbar/p ratio K-/p- pbar/p-

2%

MHz K beam

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SLIDE 21

Hadron hall extension

21

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SLIDE 22

Hadron hall extension

22

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SLIDE 23

K10 beam line

  • Separated K/pbar beams up to 10 GeV/c
  • RF separator

⇒ ~107 /spill beam ＊High intensity, purity and momentum hadron beams

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Conceptual design of Di-muon spectrometer

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SLIDE 24

Summary

  • Motivations of hadron physics
  • Effective degree of freedom of hadrons
  • Spectroscopy of excited states
  • Properties in finite density
  • Measurement of hadron properties in nuclear medium
  • Experimental approaches to understand hadrons
  • Spectroscopy of hadrons with heavy quarks
  • Charmed baryon, X* and W*
  • Meson in nuclei
  • Vector meson(f), DDbar, Charmonium
  • J-PARC facility: High-intensity

& High-momentum hadrons beams

  • High-momentum beam line
  • Unseparated beam
  • Multi-propose spectrometer
  • K10 beam line in extended hadron hall
  • Separated K/pbar beams

24

Q q-q

＊Key: Hadron with heavy quark

Q q _