hadron physics at j-parc - jaea · 2016. 1. 20. · search for k-pp . double strangeness with...
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Hadron Physics at J-PARC - current hadron physics programs &
future possibility for J-PARC HI - M. Naruki (Kyoto Univ.)
2016/1/20 at Reimei WS
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Contents Introduction Physics programs at the J-PARC Hadron Facility Recent results Near future programs
Possibilities in HIC at J-PARC Summary
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Hadron Structure
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composed of quarks and gluons How do they composed to produce its
experimentally observed properties?
description based on QCD understand degree of freedom and interaction between
them
QM flux tube diquark meson-baryon
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Strangeness
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nucleus pion, proton
hypernucleus
u d u
u d s
kaon, hyperon
u
s
d
up, down
strange
QUARK HADRON NUCLEUS
hypernuclear physics hadron spectroscopy exotic hadron
𝑢� s
probe to investigate matter
u �̅�
-S
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d
u u
d
s
Pentaquark Θ+
Λ,Ξ
Ξ hypernuclei in 12C(K-,K+)
kaonic nuclei
Λ6
ΛHe double-Λ
Strangeness Physics Hadron Mass
SKS
K1.8BR
KL
K1.1
Hadron & Nuclear Physics at J-PARC φ(1020)
K1.8
Charmed Baryon spectroscopy
production target
MC
MC Λ(1405) in d(K‒-,n)
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Beam line specifications
Name Particles Pmax Intensity K1.8 π, K, p̅ 2.0 GeV/c 106 K- ’s K1.8BR π, K, p̅ 1.1 GeV/c 106 K- ’s KL neutral K K1.1BR π, K, p̅ 0.8 GeV/c 106 K- ’s K1.1 π, K, p̅ 1.1 GeV/c 106 K- ’s High-p proton 31 GeV/c 1010 p
High-p secondary
π/K/p̅ (unseparated.)
20 GeV/c 106 K- ’s
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new
𝑠 = 2.2 GeV 𝑠 = 6.2 GeV in 20GeV/c πp/Kp reactions
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Current Hadron Physics Programs Hadron Physics Exotics multiquark systems
pentaquark Θ+
H dibaryon : J.K. Ahn’s talk on Tuesday hadronic molecular states
Λ(1405) kaonic nuclei
Dilepton
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Exotics : Recent Results Search for pentaquark Θ+ dσ/dΩ=0.28μb/sr (lab.) Γ<0.36MeV
Search for kaonic nuclei k−pp in π/K-induced reactions Sakuma-san’s talk on Monday
Spectral information of Λ(1405) p(π −,K−) PRL109(2012)132002
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3He(K−,n)X : PTEP 2015, 061D01
d(π+,K+), PTEP (2015) 021D01
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Λc @
1 n
b
Λc(2
595)
Λc(2
625)
Σ c(2
765)
Σ c(2
800)
Λc(2
940)
Σ c(2
455)
Σ c(2
520)
Λc(2
880)
Toward Baryon Spectroscopy
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charmed baryon spectroscopy (E50) at the newly constructed high-momentum beamline talk by K. Shirotori-san on Monday
D* (q: mom. transfer)
π− D*−
p Yc+
L “ud” “ud”
u c
Missing mass spectroscopy: 20GeV/c π− + p → Yc*+ + D*−
sensitivity : 0.1nb
• Cascades can be also studied with E50 spectrometer.
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Dilepton Measurement
previous experiment KEK-PS E325 near future experiment : J-PARC E16
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HIC vs. Cold Nuclear Matter
e-
e-
e+
φ e+
• extreme condiction at high temperature • convolution of space-time evolution
• partial restoration of CS at normal nuclear density
• cold nuclear matter : stable system 11
HIC
μ nuclei
Color Superconductor
Critical point
Hadron Gas
Tc ~ 170 MeV
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Dilepton measurement in pAφX βγ<1.25 (Slow) 1.25<βγ<1.75 1.75<βγ (Fast)
Larg
e N
ucle
us
Smal
l Nuc
leus
R. Muto et al., PRL 98(2007)042501 Rejected at 99% confidence level
KEK-PS E325
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Di-electron measurement at J-PARC vector meson production in
30GeV/c p+A high rate capability ~107 interaction
GEM Tracker electron ID : HBD + Lead Glass
Calorimeter Large Acceptance (5 X E325)
high statistics & high mass resolution
systematic study of in-medium mass velocity dependence A dependence (p Pb)
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Expected Signals
invariant mass spectra
momentum dependence of mass
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HIC vs. cold nuclear matter
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Heavy Ion Collisions
Baryon Density nuclei
Color Superconductor
Critical point
Quark Gluon Plasma
Hadron Gas
Neutron Stars
Tc ~ 170 MeV RHIC
SPS
KEK/J-PARC/JLAB HADES
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Recent Hypernuclear Experiments J-PARC E13 : Hosomi-san’s talk on Tuesday J-PARC E05 : pilot run last autumn
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4He(K−,π−)4ΛH , PRL 115, 222501 (2015) CH2(K−,K+)Ξ− 2015 Autumn, E05 pilot run
6000Ξ/day
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Summary of Stage-2 Exp.
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270kW 3kW 50kW
E19
E10
E13 E27
E07 E03
E05
π Κ
E17
E15
K1.8
K1.8BR
Search for Pentaquark Θ+
neutron rich Λ-Hypernuclei
Search for K-pp
Double Strangeness with Emulsion
X rays from Ξ- Atom
Ξ-Hypernucleus (priority 1)
Gamma-ray spectroscopy of light hypernuclei (priority 2)
Kaonic 3He
deeply bound kaonic nucleus
30 days
25kW
E31 spectral information of Λ(1405)
10kW
now
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Hadron Physics at J-PARC HI
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Structure of Hadron production rate <-> structure
Dilepton spectral information at high density
Nuclear Physics : Hypernuclei production of hypernuclei which is not significantly
produced in elementary productions
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Structure of Hadron Experimental Approaches properties such as mass, width decay pattern reaction rate
Reactions reactions between hadrons at low/mid-energies production rate in HIC
production rate
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Suppression of Λ(1520)
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Measured Λ(1520)/Λ(1115) is smaller than thermal model prediction
coalescence model works taking into account the p-wave state of strange quark in Λ(1520) 0.5~0.6, Y. Kanada-En’yo & Müller, PRC 74 (2006) 061901(R) coalescence factor :
s-wave : 0.360 p-wave : 0.093 d-wave : 0.029
STAR, PRL97 (2006)132301
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Production Rate based on Statistical Model
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2q/3q configurations are in the range of 0.2 ~ 2 (gray zone).
0.2~2
ExHIC, PRL 106 (2011) 212001
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quark / molecular coalescence yield of compact multiquark states ~1/10 of normal 2q/3q, since the coalescence of additional
quarks is suppressed. molecular states larger yields from coalescence model compared with that
of statistical model large yield of loosely bound states
large size <-> large coalescence probability cf. Λ(1405) as a deeply bound state has the smaller yield
production rate in HIC may be a good tool to approach the structure of hadron
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Strangeness Production agree with the statistical model ratios to pions seem to be
enhanced at the J-PARC energies. S=-1 Λ/π ~ 0.1 S=-2 Ξ/π ~ 0.01 S=-3 Ω/π ~ 0.001 at maximum
𝑠𝑁𝑁 J-PARC HI
X. Zhu et al., JoP C.S.509(2014)012004 24
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Hypernuclear Production in HIC
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at RHIC/LHC energies : yields are consistent with the statistical model
HypHI exp. 6Li + 12C @ 2.7GeV : 3ΛH ~4μb FOPI exp. Ni + Ni @ 2.67GeV 3ΛH/Λ ~ 0.52
ALICE [email protected] STAR Au+Au@200GeV
FOPI
HypHI
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Hypernuclear Production
Andronic et al., PLB697(2011)203
J-PARC HI 26
Cross Section ~ GeV/c π + C K + 12
ΛC : ~ 10μb/sr ~ GeV/c K + C K + 12
ΞBe : ~ 0.1μb/sr ~ GeV/c A + C3
ΛH + X : ~0.1μb
5 AGeV A + A in the coalescence model single-Λ hypernuclei ~μb double-Λ hypernuclei 0.1nb Ξ hypernucleai ~ 10nb
Statistical Model : largest yield is expected at J-PARC HI especially for double-Λ hypernuclei
106 K beam * 1% target : 104 int. 1010 A beam * 0.1% target : 107 int.
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Summary
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The operation of the J-PARC Hadron Facility has been successfully resumed and a variety of results has been reported. search for Θ Kpp productions in meson-induced reactions hypernuclei
Dilepton measurement & Charmed baryon spectroscopy will be performed at the high-momentum beamline being newly constructed.
Future progress & complimentary studies are expected in the J-PARC HI project.