Investigation of Baryon Interactions with Strangeness Group...
Transcript of Investigation of Baryon Interactions with Strangeness Group...
![Page 1: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/1.jpg)
Investigation of Baryon Interactions with Strangeness
( Group‐B01 )2020/1/23
T.Takahashi (KEK‐IPNS)
![Page 2: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/2.jpg)
Contents
• Overview of Group‐B01 researches• Subjects and status of experiments at J‐PARC
• E40: p scattering• E42: Search for H‐dibaryon• E03: X‐ray spectroscopy of ‐atom
• Summary
![Page 3: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/3.jpg)
Cluseters of strange hadrons for investigating hierarchical structure of matter (Group‐B01)
PI: H.Tamura (Tohoku U.), CI: T.Nagae (Kyoto U.), T.Takahashi (KEK), K.Miwa(Tohoku U.)
1. Origin of nuclear force NN → YN and YY
su
u udu p
p, p scattering exp.
d
u u
dss
Search for H‐dibaryon
6q d
s udd
ns
Search for n bound nucleiN int. & ‐nuclei
2. Meson‐Baryon molecule
s
uu d
u
p
K‐
(1405)=“Kp”Strucure of “Kppp” nucleus
KpKp nucleus
3. In‐medium baryon properties
Modification of g in medium
![Page 4: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/4.jpg)
Slide by Koji Miwa
Baryon Baryon interaction by Lattice QCD
(27)
(10*)
(8s)
(10)
(8a)(1)
Lattice QCD calc.T. Inoue et al.Prog. Theor. Phys. 124 (2010) 4
Strong repulsive core
Weakly repulsive or attractive Core
+p (S=1, T=3/2) p (S=0, T=1/2)
p (T=0)
6 independent forces in flavor SU(3) symmetry8〇8 =x
color magnetic interaction
quark Pauli effect
J-PARC E40
Flavor singlet (H-Channel)J-PARC E42
![Page 5: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/5.jpg)
J‐PARC E40: ±p Scattering Experiment (Miwa et al.)
production via ±p→K+±
p = 0.4 ~ 0.8 GeV/c
400 mm
K+
p
n
p
Ep Cylindrical
Fiber Tracker
BGO calorimeterCATCH detector
Very large repulsive core is predicted in N (T=3/2,S=3/2)
due to quark Pauli effect
Liq H2 target
Slide by K. Miwa
Measure d/d for p, p, p->n 20M /spill
![Page 6: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/6.jpg)
History of E40: ‐proton scattering exp.• Feb. 2018
• Detector Commissioning • June 2018
• p 1st production run (2 days)• Feb. ー Apr. 2019
• p 2nd production run (20 days) done• p 1st production run (13 days)
terminated due to Acc. trouble• Feb. 2020 ー
• p 2nd production run (14 days) to be completed
![Page 7: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/7.jpg)
p → p
p → n
Slide by K. MiwaKinematical matchingp (direction, E)
direction
p (direction, E)
direction
![Page 8: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/8.jpg)
CMcos-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
(mb/
sr)
/d
d
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
p scattering at 0.55 < p(GeV/c) < 0.65)- (/ddSimulationCross section in simulation600MeV/c NSC97fESC08600 MeV/c fss2600 MeV/c chiral EFTE289 data (0.4<p(GeV/c)<0.7)
CMcos-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
(mb/
sr)
/d
d
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
n scattering (0.45 < p(GeV/c) < 0.55) p -
Simulation
Cross section in simulation
500MeV/c NSC97f
500 MeV/c fss2
ESC08
500 MeV/c chiral EFT
p → p (0.55 < p (GeV/c) < 0.65) p → n (0.55 < p (GeV/c) < 0.65)
Data (angular distribution)
out o
f acc
epta
nce
Data: Before acceptance and efficiency correction
Forward peak structure Rather flat structure
expected accuracy (simulation)
expected accuracy (simulation)
Slide by K. Miwa
![Page 9: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/9.jpg)
H‐dibaryond
u u
dss• 6 quarks (uuddss) system with I=0, J=0+
• Deeply bound state was predicted by R.L.Jaffe in 1977→ Deeply bound state was rejected by NAGARA event (6He)
MH≧ 2M 7.25 MeV• lattice QCD simulation at almost physical point
• exist around near N threshold !?• No experimental evidence
ΞNΣΣΛΛHBB84
83
81)1(
![Page 10: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/10.jpg)
Lattice QCD calculation for H dibaryon
10
Physical π massPhysical π mass
Calculation atalmost physics point
P.E. Shanahan, A.W. Thomas, and R.D. Young, PRL 107 (2011).
K. Sasaki for the HAL Collab., Reimei 2016, Inha (2016).
Exist aroundΞN threshold?
![Page 11: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/11.jpg)
HAL QCD arXiv:1912.08630v1 18‐Dec‐2019
N
weakly attractive
attractive
N (quasi) bound states?
Weak N→ conversion
11S0 interaction
![Page 12: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/12.jpg)
Lattice QCD vs ALICE data
12
![Page 13: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/13.jpg)
Past experiment for H‐dibaryon
13
C.J. Yoon et al., PRC 75, 022201 (2007).
KEK E522:“pp”(K‐, K+)ΛΛ reaction
with SciFi active target (CH2)
Hint of H dibaryon?
B.H. Kim et al., PRL 110, 222002(2013).
Belle data: ΛΛ invariant mass
from Y(1s) and Y(2s) decayNo peak was observed
![Page 14: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/14.jpg)
J‐PARC E42 experimentH‐dibaryon search by using “pp”(K‐, K+)H reaction with diamond target
HyperonSpectrometer
HypTPC
K⁻ beam K+
KEK E522 J‐PARC E42
14
σΔM~ 5 MeV90 ΛΛ evens
σΔM ~ 1 MeV1.5×104 ΛΛ events
Simulation
![Page 15: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/15.jpg)
Sensitivity
From 29th J‐PARC PAC by J.K.Ahn
H→ p H→ H→ p
![Page 16: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/16.jpg)
E42: Schedule at K1.8 of J‐PARC HEF
• Feb. ‐Mar. 2020 E40 physics run• Parasite test of TPC detector
• Apr. ‐ Oct. 2020 Setup KURAMA spectromter• Excitation test of H.S. magnet with KURAMA magnet
• Nov. 2020 E03 physics run• KURAMA detector (Water Cherenkov) & trigger study
• Dec.2020 ‐ Feb.2021 H.S. installation• Mar. ‐ Apr. 2021 E42 comm. + physics run
![Page 17: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/17.jpg)
N interaction & ‐NucleiSeveral event‐samples on ‐ 14N system
Nuclearboundstates
Slide by J.Yoshida
![Page 18: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/18.jpg)
Outline of the E03 experiment• World first measurement of X‐ray from Ξ− atom
→ Direct information on the Ξ‐nucleus(A) optical potential
• First step of systematic measurements to obtain 10% statistics of the original proposal.
→ Establishing experimental method in this experiment
Method: ‐ Produce Ξ− by the Fe(K−,K+) reaction
Magnetic spectrometers for K±
‐ Stop Ξ− in the target → Ξ− atomDense Fe target
‐Measure X raysGe detectors
Ξ− atom
X rayabsorption
Ξ−
Fed ss
X ray
Ξ−K−
K+
Fe target
![Page 19: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/19.jpg)
Level scheme of Fe Ξ− atomEn
ergy [a
rbitrary scale]
I (orbital angular momentum)
Ξ−
Fe
n=5
n=7→6 : X‐ray energy = 172 keV ← small shift/widthn=6→5 : X‐ray energy = ~286 keV ← finite shift/width due to ΞN interaction
expected shift ~ 4keV, width(Γ) ~ 4keV(theoretical case study with W.S. pot. of ‐24‐3i MeV)
Ξ−
Fe
n=6
n=7
Nuclear absorption
Nuclear absorption
w/o st. int.Energy shift
![Page 20: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/20.jpg)
Level scheme of Fe Ξ− atomEn
ergy [a
rbitrary scale]
I (orbital angular momentum)
Ξ−
Fe
n=5
n=7→6 : X‐ray energy = 172 keV ← small shift/widthn=6→5 : X‐ray energy = ~286 keV ← finite shift/width due to ΞN interaction
expected shift ~ 4keV, width(Γ) ~ 4keV(theoretical case study with W.S. pot. of ‐24‐3i MeV)
Ξ−
Fe
n=6
n=7
Nuclear absorption
Nuclear absorption
w/o st. int.Energy shift
Observable
Ge detector
![Page 21: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/21.jpg)
Level scheme of Fe Ξ− atomEn
ergy [a
rbitrary scale]
I (orbital angular momentum)
Ξ−
Fe
n=5
n=7→6 : X‐ray energy = 172 keV ← small shift/widthn=6→5 : X‐ray energy = ~286 keV ← finite shift/width due to ΞN interaction
expected shift ~ 4keV, width(Γ) ~ 4keV(theoretical case study with W.S. pot. of ‐24‐3i MeV)
Ξ−
Fe
n=6
n=7
Nuclear absorption
Nuclear absorption
w/o st. int.Energy shift
Observable
Sensitive to potential shape
Ξ- wave function
ΞA optical potential
tρ potential
Nijimegen D→ G‐matrix
Ge detector
Phase‐1 Physics run in Nov. 2020
![Page 22: Investigation of Baryon Interactions with Strangeness Group ...be.nucl.ap.titech.ac.jp/cluster/content/files/2020.01...•Mar. ‐Apr. 2021 E42 comm. + physics run N interaction &](https://reader035.fdocuments.in/reader035/viewer/2022063022/5fea7e0d80bfad132f6af245/html5/thumbnails/22.jpg)
Summary• Group‐B01 researches aim to investigate the origin of nuclear force, meson‐baryon molecule, and hadron properties in medium, by adding strangeness (s‐quark) .
• Three experiments to investigate baryon‐baryon interactions; YN scattering, H‐dibaryon, and ‐atom, are in progress or carried out soon at J‐PARC.