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Strange and Charm Hadron Physics at J-PARC in Future
H. Noumi, RCNP, Osaka University
1. High-p BL and CHARM Spectrometer2. Hadron Spectroscopy w/ heavy flavors3. Summary
HYP2015, Sep 11, 2015
2
High-res., High-momentum Beam Line
30 GeV
proton beam
Production
Target
Pion Beam
Up to 20 GeV/c
Spectrometer
T1
• High-intensity secondary Pion beam– 1.0 x 107 pions/sec @ 20GeV/c
• High-resolution beam: Dp/p~0.1%
K+
p-
ps-
decayp(p+)
RICH
ITOF
FiberTracker
DCDC
DCTOF
H2 TGT
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
1.0E+08
1.0E+09
0 5 10 15 20
Co
un
ts/s
ec
[GeV/c]
Prod. Angle = 0 deg. (Neg.)
Sanford-Wang
15 kW Loss on Pt
Acceptance :1.5 msr%, 133.2 m
p-
K-
pbar
CHARM Spectrometer Design
3
D0(Yc’)
p(p)
Inclusive p(p-,D*-) Yc*+
p(p-,D*-p)D0
Yc*+
( p(p-,D*-p)Yc’ )
(Target)
Acceptance:
~ 60% for D*,
~ 80% for decay p+
Resolution:
Dp/p~0.2% at ~5 GeV/c
（Rigidity： ~2.1 Tm)
K+
p-
ps-
decayp(p+)
RICH
ITOF
FiberTracker
DCDC
DCTOF
H2 TGT
Cross Section:
s (Lc) ~ 1 nb (no meas.)
How Hadrons are formed?
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High E Low E
It seems still unclear to answer a question how hadrons form current quarks.
Meson
Baryon
How Hadrons are formed?
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𝛼𝑠 = ∞at LQCD
High E Low E
Quarks drastically change themselves below LQCD.
Meson
Baryon
How Hadrons are formed?
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High E Low E
Meson
Baryon
“Effective DoF”
“Constituent Quarks” seem to work rather wellas good building blocks of hadrons…
How Hadrons are formed?
7
High E Low E
Pentaquark?
Tetraquark?
“Effective DoF”
“Exotic hadrons” require a new aspectin describing hadrons beyond the “standard picture”.
How Hadrons are formed?
8
High E Low E
“Composite (or Colored) Quasi-Particle?”
What we can learn from baryons with heavy flavors
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• Quark motion of “qq” is singled out by a heavy Q • Diquark correlation
• Level structure, Production rate, Decay properties• sensitive to the internal quark(diquark) WFs.
• Properties are expected to depend on a Q mass.
q
q
q Q
• λ and ρ motions split (Isotope Shift)
• HQ spin multiplet （ 𝑠𝐻𝑄 ± 𝑗𝐵𝑟𝑜𝑤𝑛 𝑀𝑢𝑐𝑘）
Schematic Level Structure of Heavy Baryons
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λ mode
ρ mode
G.S.
P-wave
Q
l
[qq]
Q
r(qq)
mQ = mq mQ > mq
q
q
q 𝑠𝐻𝑄 ± 𝑗𝐵𝑀
......
Spin-dep. Int.
ℏ𝜔𝜌
ℏ𝜔𝜆=
3𝑚𝑄
2𝑚𝑞 + 𝑚𝑄→ 3 (𝑚𝑄 → ∞)
Lambda Baryons (P-wave)
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Sc(1/2+)
Sc*(3/2+)
Lc(2595, 1/2-)Lc(2625, 3/2-)
Lc oｒ Sc (2765, ??)
Lc(2880, 5/2+)
Lc(2940, ??)
Lc(GS)
L(1520, 3/2-)
S(1/2+)
L(1/2+)
S*(3/2+) L(1405, 1/2-)
L(1830, 5/2-)
L(1690, ??)L(1670, 1/2-)
L(GS)
Sb(1/2+) Sb
*(3/2+)
Lb(5920, 3/2-)Lb(5912, 1/2-)
Lb(GS)
strange charm bottom
0
100
200
300
400
500
600
700
800
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Y* -
YG.S
.[M
eV]
MQ [GeV/c2]
Lambda Baryons (P-wave)
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s c
non-rel. QM:H=H0 +Vconf +VSS+VLS+VT
r-l mixing (cal. By T. Yoshida)
Sc(1/2+)
Sc*(3/2+)
Lc(2595, 1/2-)Lc(2625, 3/2-)
Lc oｒ Sc (2765, ??)
Lc(2880, 5/2+)
Lc(2940, ??)
Lc(GS)
L(1520, 3/2-)
S(1/2+)
L(1/2+)
S*(3/2+) L(1405, 1/2-)
L(1830, 5/2-)
L(1690, ??)L(1670, 1/2-)
L(GS)
l
r
b
r
Sb(1/2+) Sb
*(3/2+)
Lb(5920, 3/2-)Lb(5912, 1/2-)
Lb(GS)
Q
l
r
0
100
200
300
400
500
600
700
800
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Y* -
YG.S
.[M
eV]
MQ [GeV/c2]
Lambda Baryons (P-wave)
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s c
non-rel. QM:H=H0 +Vconf +VSS+VLS+VT
r-l mixing (cal. By T. Yoshida)
Sc(1/2+)
Sc*(3/2+)
Lc(2595, 1/2-)Lc(2625, 3/2-)
Lc oｒ Sc (2765, ??)
Lc(2880, 5/2+)
Lc(2940, ??)
Lc(GS)
L(1520, 3/2-)
S(1/2+)
L(1/2+)
S*(3/2+) L(1405, 1/2-)
L(1830, 5/2-)
L(1690, ??)L(1670, 1/2-)
L(GS)
l
r
b
r
Sb(1/2+) Sb
*(3/2+)
Lb(5920, 3/2-)Lb(5912, 1/2-)
Lb(GS)
Q
l
r
Lc(2880)
Lc(2940)
Sc*(2520)
Sc(2455)
Lc(2880)Belle, PRL98, 262001(’07)
Lc(2880)->pSc(2455)
Lc(2765)?
J=5/2 → J’=1/2
Lp=3 transition
JP=5/2+ for Lc(2880)
Lp=1 contribution may affect…
G(Lc(2880)->pSc(2455))
G(Lc(2880)->pSc*(2520))
Is it a D-wave Lambda-c Baryon?If so, where is a spin partner ?
Charmed Baryon SpectroscopyUsing Missing Mass Techniques
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Production and Decay reflect [qq] correlation… C.S. DOES NOT go down at higher L when qeff >1 GeV/c.
p
p-
D*-
Yc*+
L
D*, Dqeff
D0
p-p-
K+
𝐷0 (𝑌𝑐∗′)
p (p)
L = 1 L = 2L = 0
1/2+
LcLc(2595)
Sc(2800)
Sc
Sc*
Lc(2625)
Lc(2880)
Lc(2940)
s ~1 nb
Missing Mass Spectrum (Sim.)• ~1000 Yc
*/nb/100 days• Sensitivity: s ~0.1 nb for
Yc* w/ G =100 MeV
1/2- 3/2- 5/2+? 3/2+?
LS partner
(HQS doublet)
LS partner?
(HQS doublet?)
1 : 2
3 : 2
Yc* Decays
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Lc(2940)->Sc0 p+
Sc++ p-
Sc0
Sc++
NpSc ~ 200 NpSc ~ 200
Lc(2940)-> p D0
NpD ~ 320 D0SUM
Signal
Main BG
with Lc+ p+ p- selected
(BRpSc =13%) (BRpD =20%)
* Branching ratios: Diquark corr. affects G(Lc*->pD)/G(Lc*->Scp).
N
DYc*’
p
lr
0
100
200
300
400
500
600
700
800
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Y* -
YG.S
.[M
eV]
MQ [GeV/c2]
Lambda Baryons (P-wave)
18
s c
non-rel. QM:H=H0 +Vconf +VSS+VLS+VT
r-l mixing (cal. By T. Yoshida)
Sc(1/2+)
Sc*(3/2+)
Lc(2595, 1/2-)Lc(2625, 3/2-)
Lc oｒ Sc (2765, ??)
Lc(2880, 5/2+)
Lc(2940, ??)
Lc(GS)
L(1520, 3/2-)
S(1/2+)
L(1/2+)
S*(3/2+) L(1405, 1/2-)
L(1830, 5/2-)
L(1690, ??)L(1670, 1/2-)
L(GS)
l
r
b
r
Sb(1/2+) Sb
*(3/2+)
Lb(5920, 3/2-)Lb(5912, 1/2-)
Lb(GS)
Q
l
r
KN
Strange Baryon SpectroscopyUsing Missing Mass Techniques
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Production and Decay reflect [qq] correlation…
p
p-
K*0
Ys*0
L
K*, Kqeff
p-
K+
𝑝 (𝑌𝑠∗′)
K- (p)
L(1405)
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S(1
38
5)
S(1
38
5)
L(1
40
5)
(a)(p-,K*0) w/ pS decayL
(15
20
)(b)(p+,K*+) w/ pS decay
S(1
77
5)
S(1
77
5)
Production rate tells how L(1405)/L(1520) deviates from/follows the quark-diquark configuration.
I = 0, 1 I = 1 only
Quark counting rule in hadron reactions
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0K (1405)pp -
+ + L
1-100 pb
J-PARC
𝑑𝜎
𝑑Ω~ 1/𝑠𝑛−2
H. Kawamura, et al., PRD 88, 034010 (2013)
Taken from T. Sekihara’s Slide
• λ and ρ mode excitations interchange
sqsQQ (+SO)
X(1/2-,3/2-)
X(1/2-, 3/2-, 5/2-)
X(1/2-, 3/2-)
X*(3/2+)
X(1/2+)
Level Structure of double-Q baryons
qλ mode
ρ mode
G.S.
P-wave
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q
l
r Q-Q
q
0
100
200
300
400
500
600
700
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
X*
-X
GS
[MeV
]
MQ [GeV/c2]
Xi Baryons
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s c
Xcc(1/2-,3/2-, 5/2-)
Xcc(1/2-,3/2-)
Xcc(1/2-,3/2-)
Xcc(3/2+)
Xcc(GS, 1/2+)
X(1950, >=5/2?)
X(GS, 1/2+)
X*(1530, 3/2+)
X(1690, ??)
X(1820, 3/2-)
X(2030, ??)
KS
l
l
r
Double Strange Double charm
non-rel. QM:H=H0 +Vconf +VSS+VLS+VT
r-l mixing (cal. By T. Yoshida)
Q
q
Ql
r
s c
JP rating
Width [MeV]
→Xp
[%]→LK
[%]→SK
[%]
X(2500) ?? 1* 150?
X(2370) ?? 2* 80? WK~9±4
X(2250) ?? 2* 47+-27?
X(2120) ?? 1* 25?
X(2030) >=5/2? 3* 20+15-5 small ~20 ~80
X(1950) ?? 3* 60+-20 seen seen
X(1820) 3/2- 3* 24+15-10 small Large Small
X(1690) ?? 3* <30 seen seen seen
X(1620) ?? 1* 20~40?
X(1530) 3/2+ 4* 19 100
24
LK(1610)
SK(1685)
Xp(1450)
Threshold
LK*(1908)SK*(1983)
S*K(1878)
X*p(1665)
WK(2166)
Little is known for X
• Narrow width: ~ a few 10 MeV• Large production cross section: ~ 1 mb
Double Strange Baryon SpectroscopyUsing Missing Mass Techniques
25
Production and Decay reflect [QQ] correlation… U-channel production may be dominant...
p
K-
Xss*0L
Y*, Y
K*0 p-
K+
𝑌𝑠∗′(X𝑠𝑠
∗′)
K- (p)
26
LoI submitted by M. Naruki and K. Shirotori
X Baryon Spectroscopy w/ the High-p Secondary Beam
• Sizable yields are expected for a month.
• Past exp.
5 GeV/c
5 GeV/c
150 mb
5 mb
Inclusive X prod.in pp
Inclusive X prod. in K-p
C.M. Jenkins et al., PRL51, 951(1983) →
p(K-,K+) spectra
𝑃𝑐 4380 , 𝑃𝑐(4450)
• Is 𝑃𝑐+ the N* with a hidden c-cbar?
• 𝑃𝑐 can be excited on its mass with 10 GeV/c pion beam at J-PARC.
• Its decay modes to 𝑌𝑐 + 𝐷.
• Its family?
27
Summary
1. A general purpose spectrometer at the J-PARC High-p BL– CHARM spectrometer will open a new platform to study
hadron physics.
2. Quark-diquark structure of heavy baryons– Mass spectrum, Production Rate, and Decay Branching ratio
– Information to access “wave function” of quark/diquark in baryons
3. Systematic studies with different flavors may help to understand the light baryon system– Meson-baryon coupling may modify mass spectrum/width
– Relation btw charmed and strange baryons are useful.
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