Ha dro n Physic s a t J-PARC - c urre nt ha dro n physic s pro g ra - - PowerPoint PPT Presentation

Ha dro n Physic s a t J-PARC

• c urre nt ha dro n physic s pro g ra ms &

future po ssib ility fo r J-PARC HI

• M. Na ruki (K

yo to Univ.) 2016/ 1/ 20 a t Re ime i WS

1

Co nte nts

 Introduction  Physics programs at the J-PARC Hadron Facility

 Recent results  Near future programs

 Possibilities in HIC at J-PARC  Summary

2

Ha dro n Struc ture

3

 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

Stra ng e ne ss

4

nucleus pion, proton hypernucleus

u d u u d s

kaon, hyperon

u s d

up, down strange

QUARK HADRON NUCL E US

hypernuclear physics hadron spectroscopy exotic hadron

𝑣

• s

probe to investigate matter u 𝑒̅

• S

d u u d s

Pentaquark Θ+ Λ,Ξ

Ξ hypernuclei in 12C(K-,K+)

kaonic nuclei

Λ 6 ΛHe

double-Λ

Strangeness Physics

Hadron Mass

SKS K1.8BR KL K1.1

Ha dro n & Nuc le a r Physic s a t J-PARC

φ(1020) K1.8

Charmed Baryon spectroscopy

production target

MC

MC Λ(1405) in d(K‒-,n)

5

Be a m line spe c ific a tio ns

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

6

new 𝑡 = 2.2 GeV  𝑡 = 6.2 GeV in 20GeV/c πp/Kp reactions

Curre nt Ha dro n Physic s Pro g ra ms

Hadron Physics

 Exotics

 multiquark systems

 pentaquark Θ+  H dibaryon : J.K. Ahn’s talk on Tuesday

 hadronic molecular states

 Λ(1405)

 kaonic nuclei

 Dilepton

7

E xo tic s : Re c e nt Re sults

 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

8

3He(K−,n)X : PTEP 2015, 061D01

d(π+,K+), PTEP (2015) 021D01

Λc @ 1 nb Λc(2595) Λc(2625) Σc(2765) Σc(2800) Λc(2940) Σc(2455) Σc(2520) Λc(2880)

T

• wa rd Ba ryo n Spe c tro sc o py

9

 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.

Dile pto n Me a sure me nt

previous experiment KEK-PS E325 near future experiment : J-PARC E16

10

HI C vs. Co ld Nuc le a r Ma tte r

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

nuc le i

Color Superconductor

Critical point Hadron Gas

T

c ~ 170

MeV

12

Dilepton measurement in pAφX

βγ<1.25 (Slow) 1.25<βγ<1.75 1.75<βγ (Fast) Large Nucleus Small Nucleus

• R. Muto et al., PRL 98(2007)042501

Rejected at 99% confidence level KEK-PS E325

Di-e le c tro n me a sure me nt a t 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)

13

E xpe c te d Sig na ls

invariant mass spectra momentum dependence of mass

14

HI C vs. c o ld nuc le a r ma tte r

15

He avy Ion Collisions

Baryon Density

nuc le i

Color Superconductor Critical point Quark Gluon Plasma Hadron Gas Neutron Stars T

c ~ 170 MeV

RHIC SPS KE K/ J-PARC/ JL AB HADE S

Re c e nt Hype rnuc le a r E xpe rime nts

 J-PARC E13 : Hosomi-san’s talk on Tuesday  J-PARC E05 : pilot run last autumn

16

4He(K−,π−)4

ΛH , PRL 115, 222501 (2015)

CH2(K−,K+)Ξ− 2015 Autumn, E05 pilot run

6000Ξ/day

Summa ry o f Sta g e -2 E xp.

17

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

• f light hypernuclei

(priority 2) Kaonic 3He deeply bound kaonic nucleus 30 days

25kW

E31

spectral information of Λ(1405)

10kW

now

Ha dro n Physic s a t J-PARC HI

19

 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

Struc ture o f Ha dro n

 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

20

Suppre ssio n o f Λ(1520)

21

 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

Pro duc tio n Ra te b a se d o n Sta tistic a l Mo de l

22

 2q/3q configurations are in the range of 0.2 ~ 2 (gray

zone).

0.2~2 ExHIC, PRL 106 (2011) 212001

q ua rk / mo le c ula r c o a le sc e nc e

 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

• f 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

23

Stra ng e ne ss Pro duc tio n

 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

𝑡𝑂𝑂 J-PARC HI

• X. Zhu et al., JoP C.S.509(2014)012004

24

Hype rnuc le a r Pro duc tio n in HI C

25

 at RHIC/LHC energies : yields are consistent with

the statistical model

 HypHI exp. 6Li + 12C @ 2.7GeV : 3

ΛH ~4μb

 FOPI exp. Ni + Ni @ 2.67GeV 3

ΛH/Λ ~ 0.52

ALICE Pb+Pb@2.76TeV STAR Au+Au@200GeV FOPI HypHI

Hype rnuc le a r Pro duc tio n

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 + C3

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.

Summa ry

27

 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.