1
Tetraquarks• Long-standing challenge in hadron physics
ü Multi-quark state other than mesons & baryons− Famous 𝐻 dibaryon as six quark state of 𝑢𝑢𝑑𝑑𝑠𝑠
ü Recent discoveries of exotic hadron candidates
with heavy quarks• Possible multi-strange dibaryons predicted by HAL QCD
ü Important to study fundamental hadron interactionsin flavor SU(3)ü Systems with 𝑆 > 2 are of particular interest− 𝑁Ω 𝐽 = 2 , ΩΩ 𝐽 = 0→ Heavy Ion collisions as unique playground for multistrange systems

Pentaquarks

Dibaryons2• Dynamic space-time evolution of the collisions through phasetransition from partonic phase (QGP) to hadronic phase
1. Initial collisions
2. QGP formation in 𝜏 < 1fm/𝑐
3. Cross-over transition to Hadron phase
at 𝑇! ~150MeV (𝜏~𝑎 𝑓𝑒𝑤 10fm/𝑐)
4. chemical freeze-out happens after
the transition
5. Evolution ends at kinetic freeze-out• Coalescence as a main particle production processü Unique in Heavy ion collisions

3• Hadron yields well-described by Statistical Hadronization modelü Global fit with Tch, µB, volume as free parametersü Works even for loosely bound particles A.Andronic et al., Nature 561, 321-330 (2018)• Clear mass dependence of the yieldS
Pb–Pb s = 2.76 TeV, 0%–10% centrality
10+

3

Rough estimation of dibaryon yields
in Pb-Pb 0-10% at ALICE

RUN-2(2015-18)

𝐻~104-5

~106

𝑁𝛺

~104

~105

𝛺𝛺

~102

~103

→ Searches for 𝐻 & 𝑁Ω dibaryons in HIC
ü Less statistics in pp High Multi. and p-Pb,
but better S/N than Pb-Pb

102

p Λ

101

Ξ

Dibaryons here

–

I

100

dN/dy/(2J + 1)

RUN-1
(2009-12)

NN

K+

Ω

–

10–1

d

10–2
10–3

3He

10–4

Data from the ALICE Collaboration

10–5

Statistical hadronization
4He

Total (after decays)

10–6
10–7

3H
Λ

Primordial
0

0.5

1.0

1.5

2.0
Mass (GeV)

2.5

3.0

3.5

4.0

4

• Possible enhancement of exotic hadrons by coalescenceü Much larger yield of 𝑋 3872 in Pb-Pb than pp• Enhanced hyperon productions
ü Increasing at higher multiplicity even in pp/p-Pb collisions
PHYSICAL REVIEW LETTERS 128, 032001 (2022)
CMS, PRL 128, 032001(2022)
1.7 nb-1 (PbPb 5.02 TeV)

1.8

CMS

Prompt

PbPb (5.02 TeV)|y| < 1.6, 0-90%

1.4= N ψ(2S) → J/ ψ π πN

X(3872) → J/ ψ π π

1.6
1.2
1

ρ

pp,PbPb

0.8

pp (7 TeV)|y| < 1.2 (CMS)

0.6

pp (8 TeV)|y| < 0.75 (ATLAS)

0.4
0.2
0

10

20

30

40

p (GeV/c)
T

50

60

70

the pions, and the radial distance between the pion and the
J=ψ candidate momentum vectors.
The uncertainty in the invariant mass fit (8.0%) iscalculated by adding in quadrature the maximum deviations from the nominal result to𝜦that found using twoalternative fitting functions for both signal and background.
For the signal, one variation consists of using a tripleGaussian function, while for the other the signal widthof the nominal fit is allowed to 𝚵
float to account for the
resolution difference between data and MC samples. Other
choices for the signal shape (e.g.,𝛀
one-Gaussian function)
were not considered because of their poor-quality fits. For
the background, the fit function is changed once to a thirdorder polynomial (as an exponential function or lowerorder polynomials could not describe the data), and thefit range is also changed from 3.62–4 GeV=c2 to
3.62–3.9 GeV=c2 to exclude the right-hand shoulder.

5

Measurements with possible daughter particles
1. Invariant mass reconstruction
ü Only if the signal width is sufficiently small
2. Two-particle correlation
𝑯 dibaryona. 𝑯 → 𝒑 + 𝝅! + 𝜦𝑵𝜴 dibaryonb. 𝑯 → 𝜦 + 𝜦/𝒑 + 𝜩!

𝜋

!

𝑝

Λ 𝑝
𝐻

primaryvertex

𝜋!

𝜋

!

𝑝

𝜋!
Λ

Λ

primaryvertex

𝜋!

𝜋

Λ
Ξ

!

primaryvertexd. 𝒑𝜴 → 𝒑 + 𝜴!

𝑝

𝑝

𝑝
𝜋!

c. 𝒏𝜴 → 𝜦 + 𝜩!

𝑝

𝑝

𝜋!

!

𝜋!

Λ
Ξ

!

𝜋!

Λ
𝑝

Λ

primaryvertex𝐾!

Ω!

primaryvertex𝑝

6oration / Physics Letters B 752 (2016)270
267–277om Fig. 1)

ALICE Collaboration/ Physics Letters B 752 (2016) 267–277
ALICE,
PLB269752,
267-277 (2016)tance × eﬃciency drops down to 1% for the !n and 10−3 for the
H-dibaryon). The shape of transverse momentum spectra in heavyion collisions is described well by the blast-wave approach, withradial flow parameter ⟨β⟩ and kinetic freeze-out temperature T kin
as in [46]. The true shape of the p T spectrum is also not known,
therefore it is estimated from the extrapolation of blast-wave fits
to deuterons and 3 He spectra at the same energy [10]. To obtain
final eﬃciencies, the resulting blast-wave distributions constructed
for the exotic bound states are normalised to unity and convoluted
with the correction factors (eﬃciency × acceptance).
Typical values of the final eﬃciency are of the order of a few
percent assuming the lifetime of the free !. The uncertainty in the
shape of the p T distributions is the main source of systematic error. Blast-wave fits of deuteron and 3 He spectra are employed to
explore the range of systematic uncertainties. Analyses of theseresults lead to a systematic uncertainty in the overall yield of
25%.
Fig. 3. Invariant aroundmass distribution
for !pπ − for the Pb–Pb data corresponding to
6
Fig. 4. Upper limit of the rapidity density as function of the decay length shown for
19 .3 × 10 central Other
events. systematic
The left arrow
indicates theare
sumestimatedof the massesof theuncertainties
by varying
thethe !n bound state in the upper panel and for the H-dibaryon in the lower panel.
constituents (!!
)
ofthepossibleboundstate.
A
signal
for
the
bound
state
is
excuts described in Table 1 and Table 2 within the limits consistent
Here a branching ratio of 64% was used for the H-dibaryon and a branching ratio of
pected in the region
this sum.
For the speculated
resonant statea signal
iswith below
the detector
resolution.
The contributionsof thesesystematic
54% for the !n bound state. The horizontal (dashed) lines indicate the expectation
expected between the !! and the 'p (indicated by the right arrow) thresholds.
of the thermal model with a temperature of 156 MeV. The vertical line shows theuncertainties are typically found to be in the percent range. The
The dashed line is an exponential fit to estimate the background.
lifetime of the free ! baryon. (For interpretation of the references to colour in thiscombination of the different sources leads to a global systematic
figure, the reader is referred to the web version of this article.)
uncertainty of around 30% for both analyses, when all uncertainTable 2ties are added in quadrature.
Monte Carlo simulations. In addition, the final eﬃciency which
Selection criteria used
analysis.
Forforthe!!
!n(H-dibaryon)
bound state
analysis the possible absorption of the-1
is discussed in section 5 is required. Further, values of branchanti-deuterons and the bound state itself whencrossing material
Selection criterion
Value
ing
ratios of the assumed bound states are needed. These depend
has to be taken into account. For this, the same procedure as used
Track selection criteria
strongly on the binding energy. With a 1 MeV binding energy forfor the anti-hypertriton analysis [9] is utilised. The absorption corTracks with kinks
rejected
the !n bound state the branching ratio in the d + π + decay chanfrom 3 to 40% (depending on theof the !nrectionNumber of clusters
in ranges
TPC
ncl >lifetime
80
nel is expected to be 54% [49]. The branching ratio for a 1 MeV orbound state, which determines the amount of2 material crossed)• Search for ΛΛ bound state as 𝐻 dibaryon with RUN-1 Pb-Pb data
ü Invariant mass reconstruction at secondary vertex− Search for Λ𝑛 bound state as well by 𝑑̅ + 𝜋 , combination→ No peak was found.
ü Upper limits of the yield below 10 of model prediction
ü Assumed to be long-lived as long as a free Λ

7
√

√

Fig. 2. !–! correlations measured in pp collisions at s = 13 TeV (left panel) and p–Pb collisions at sNN = 5 .02 TeV (right panel) together with the functions computedby the different models [20]. The tested potentials are converted to correlation functions using CATS and the baseline is refitted for each model. The effects of momentum
resolution and residuals are included in the theory curves.

pp, 13TeV
p-Pb, 5.02TeV
ALICE Collaboration / Physics Letters B 797 (2019) 134822

5

ALICE, PLB 797, 134822 (2019)

existing model predictions are summarized in [20] and the corresponding potentials V (r ) are parametrized in a local form using adouble-Gaussian function. The correlation function depends on thenature of the underlying interaction and Fig. 2 shows the√ experPossible bound states = 13
imental !–! correlations measured in pp collisions at√
sNN = 5 .02 TeV (rightTeV (left panel) and p–Pb collisions at
panel) together with the correlation functions obtained for different meson-exchange interaction potentials employing CATS. Models with a strongly attractive interaction ( f 0−1 ! 1 and positive),like the Ehime [17] potential, result in a large enhancement of thecorrelation function at low momenta which overshoots the data
significantly both in pp and p–Pb collisions. The same is valid for√potentials
corresponding to a shallow
bound state ( f 0−1 → 0 and√attractive
elations measured in pp collisions at s = 13 TeV (left panel) and p–Pb collisions at sNN = 5 .02 TeV (right panel) together
with the functions computedrepulsive
negative),
NF44functions[19 ]. using CATS and the baseline is refitted for each model. The effects of momentum
models [20]. The tested potentials
are converted e.g.
to correlation
siduals are included in the theory curves.
Fig. 3. Exclusion plot for the !–! scattering parameters obtained using the !–!
The other tested potentials correspond either to a bound state√−1
correlations from pp collisions at s = 7 and 13 TeV as well as p–Pb collisionsorashallow
attractive(f"
1)
non-binding
interaction.
However,√0l predictions are summarized in [20] and the correat sNN = 5 .02 TeV. The different colors represent the confidence level of excludthosetwovery
different
scenarios
resultinsimilarcorrelations
andentials V (r ) are parametrized in a local form using a
ing a set of parameters, given in nσ . The black hashed region is where the Lednický
an function. The correlation
depends
on thearefunction
diﬃcult
to separate.
This is evident from Fig. 2 as all of themodel produces an unphysical correlation. The two models denoted by colored stars
underlying interaction and Fig. 2 shows the√ exper-[22] and Nijmegen ND46 [18 ] models produce
ESC08
[48
],
HKMYY
are compatible with hypernuclei data, while the red cross corresponds to the precorrelations measured in pp collisions at
s = 13√liminary result of the lattice computation performed by the HAL QCD collaboration.
comparable
and are compatible with the experimental data,el) and p–Pb collisions at
sNN = 5 .02 results
TeV (right
For details regarding the region at slightly negative f 0−1 and d0 < 4, compatible
er with the correlation functions
obtained theirfor differeven though
scattering parameters are different. In particular,
with a bound state, refer to Fig. 4.
change interaction potentials employing CATS. ModND46−1 predicts a bound state, while the ESC08 and HKMYY models
rongly attractive interaction ( f 0 ! 1 and positive),a shallow
attractive potential and the latter is consistente [17] potential, result in adescribe
large enhancementof theTo quantify the uncertainties of f 0−1 and d0 , and estimate thenction at low momenta which
overshoots the datawith hypernuclei
data [7,8 ].
confidence level of each parameter set, a Monte Carlo method is
oth in pp and p–Pb collisions.The
The Lednický
same is valid
for
model
can be used to compute C (k∗ ) for any f −1

• ΛΛ correlation measured in pp & p-Pb collisions
ü Flat correlation allowing a large parameter space→ Almost excluded a possibility of existence of bound stateü Non-existence of bound state supported by HAL QCD calculations
with nearly physical point

8

nd Coulomb
ed in pp and p-Pb colliding systems
edict in PNM a slightly repulsive UΞ ~+6 MeV(*) →ALICE, ALICE
Nature588, 232-240 (2020)
Coll. Nature 588, 232–238 (2020)

K.Sasaki et al., Nucl. Phys. A 998, 121737 (2020)

3.5
ALICE data
Coulomb

3-

Coulomb + p-Ξ HAL QCD-

Coulomb + p-Ω

C (k *)

2.5-

Coulomb + p-Ω21.5

reff= 1.02 fm

1
0

100

200

300

k * (MeV/c )(*) HAL QCD Coll., PoS INPC2016 (2016) 277

34• Attractive 𝑝Ξ - interaction by strong
interaction
Fig. 4. (a) !! scattering phase shift, (b) !! inelasticity, and (c) N " scattering phase shift in the 11 S0
ü Quantitative agreement with HAL QCD
ü Possible resonance stateTheat!!
𝑁Ξphasethresholdshifts and the inelasticity are defined by the !!-component oη exp(2iδ!! ). In
Fig.reconstructing
4 (a, b), they are shown as a func
by-two S-matrix,(S)!!
→ Looking for a possible peakaround𝑁Ξ= thresholdby
2center-of-massenergy ECM = k /m! with k being the relative momentum betwe- from primaryinvariant mass of ΛΛ & t/a𝑝Ξ=vertex11, 12, 13. The t-dependenceis minor within the statistical errors. We found t

9

nd its role in pΩ interaction

ΛΞ

ALICE, Nature 588, 232-240 (2020)
C (k *)

h Eb~2.5 MeV

7

-

pp HM

Coulomb + HAL-QCD
3

Coulomb + HAL-QCD (with S1)

5

𝜴𝜴

𝟏

𝑵𝜴

𝟓

C (k *)

Coulomb

4

𝑺𝟎

deuteron

1.2
1.1
1

3

cases:

Iritani et al. / Physics Letters B 792
T.Iritani et al., PLB 792, 284-289 T.(2019)

p-W ALICE data

6eV by ALICE

288

0.9
0.8

2

100

200

300
k * (MeV/c )

𝑺𝟐

1
0

100

200

300

k * (MeV/ c )5. The ratio of the effective range r and the scattering length a as a func• Attractive 𝑝Ω- interaction by strongFig.
interactiontionof r for N !( S ) (red circle) and !!( S ) [7] (blue diamond) on the lattice,
ALICE Coll. Nature 588 (2020) 232-238
as well as for N N ( S ) (purple up-pointing triangle) and N N ( S ) (green downü More attractive
than 𝑝Ξ pointing triangle) [37] in experiments.
ü Consistent with HAL QCD
21
0.16
+0.02
a0 = 5.30(0.44)(+(8)−0.01 ) fm, r eff = 1.26(0.01)(−0.01 ) fm,
ü Possible quasi-bound state (𝐽 = 2) similar to deuteron
where the central values and the statistical errors are estimated at− No Pauli blocking & assist by Coulomb
attractionfor𝑝𝛺last parentheses aret /a = 12, while thesystematic errors
in theestimatedfrom the central values
for t /a = 11, 13 and 14.
→ Looking for a possible signal for 𝑛Ω
quasi-boundstate
5

pport therelations

eff

5

3

eff

2

1

0

0

1

In Fig. 5, the ratio r/a

as a function of r

10

for N !( S )Fig. 6(red cthe ststatist

exp(
rors
whic
tima
The

10

ALICE, PLB 728, 216 (2014)
70
350
60
300

p-Pb,
pp, ssNN==
135.02
TeVTeVMB Trigger
Trigger
HM

-

X
X+
L+L

data
data
backgroundfitfit
background

50
250
40
200

selection
window
selection window

30
150

puritypurity==92.1
94.1 %%

signal+backgroundfitfit
signal+background

2200

´10

ALICE Performancepp, s = 13 TeV

2000

HM Trigger

1800
1600

-

X + X+

data

1400
1200

background fit

Single 𝜦Single 𝚵

purity = 92.0 %

600

20
100

Pb-Pb at sNN = 2.76 TeV

200

0-80% centrality

(a)

-

Ξ
+
Ξ

signal+background fit

selection window

1000
800

×103

3

Counts / MeV/c 2

80 ALICE Performance
400 ALICE Performance

2400

Counts / MeV/c 2

6
´´10
10

Counts/(MeV/ c 2)

Counts/(MeV/cc22))
Counts/(MeV/

3

450

100

Single 𝚵

400
10
50

00

×103
30 Pb-Pb at s = 2.76 TeV
NN
25

0-80% centrality

(b)

-

20

Ω
+
Ω

15

Single 𝛀

10

200
1.29
1.33 1.13
1.34
1.09 1.30
1.10 1.311.111.32 1.12

ALI−PERF−503934

1.35
1.14

1.36

0

1.29

1.30

(GeV/ c22)

M
MLpp-(Lppp++)) (GeV/c )pp 13TeV, High Mult.

1.31

1.32

1.33

1.34

1.35

1.36

2

M Lp-(Lp+) (GeV/ c )

0

1.3

1.32

1.34

1.36

1.64

1.66

2

Invariant Mass( Λ, π ) (GeV/c )

1.68

1.7

Invariant Mass( Λ, K ) (GeV/c2)

Pb-Pb 2.76TeV (Run-1)• Successful reconstruction for Λ, Ξ, Ω in pp HM, p-Pb, Pb-Pb
ü pp HM & p-Pb: Good purity for single hyperon reconstruction− Λ: 94%, Ξ: 92% in pp HM
ü Pb-Pb: increase of combinatorial background→ Ongoing efforts to improve hyperon purities in Pb-Pb

11

𝑯→𝜦+𝜦

𝑵𝜩 threshold

𝑯 → 𝒑 + 𝜩!

𝒏𝜴 → 𝜦 + 𝜩!

𝒏𝛀 threshold• Initial attempts with pp HM & p-Pb
ü Analyzed events: 1B (pp HM), 0.6B (p-Pb MB) events
ü No significant peak so far− 𝑝𝛺 → 𝑝 + 𝛺- analysis is ongoing− 𝑁𝛺: Statistically suffering with finer mass-bin→ More statistics from ongoing Pb-Pb data analysis

112

Non-bound Unitaryand
Bound
3 : ΛΞ
interaction
its role in pΩ interaction
0
-4

0
2
4
0
K.Morita et al., PRCR/a101,
015201 (2020)-2

ALICE, Nature 588, 232-240 (2020)

C(LL)(q)Σ-Ξ2

R/a0=-0.3
-1
2609
0.3
k*~460𝒂 <𝟎 1

3

5

reﬀ/R = 0

rements of pΩ in pp HM 13 TeV by ALICE
1 interaction
attractive

1.5-

p-W ALICE data

Coulomb + HAL-QCD (with S1)

attractive/nobound stateΝ-Ωminant inelastic
contributions
0
0.5
1

STAR Collaboration / Physics Letters B 790 (2019) 490–497
STAR, PLB
790, 490-497 (2019)

Coulomb + HAL-QCD

6

𝟎

𝒂 >𝟎
n with lattice predictions in𝟎 two cases:
repulsive/bound state0

𝑹 = 𝟎. 𝟕𝟑 fm

7

Coulomb
C (k *)

f inelastic channels:(b)

C (k *)

Ω interaction → di-baryon with Eb~2.5 MeV
32514
k*~300

ΛΞ

4

1.1
1

3

0.9
0.8

2

2

qR

eement with
FIG. 1. The correlation function C (LL) (q) with reff = 0 as a funcle
inelastic contributions → support then of R/a0 for different qR (a) and as a function of qR for different
oa0obtained
measuredcorrelations
value (b). InintheΛΞ
present
sign convention,
a0 > 0 corresponds toexistenceof a boundstate
state.
enceof bound

1.2

100

200

300
k * (MeV/c )𝑹 = 𝟓 fm

1
0

100

200

𝑹 = 𝟐. 𝟓 fm

300

k * (MeV/ c )¯ (P! + P̄ !
¯ ) for (0–40)% (a) and (40–8
Fig. 3. Measured correlation function (C(k∗ )) for proton–! and antiproton–!
represent raw correlations, open circles represent pair-purity corrected (PP) correlations, and solid circles represen
The error bars correspond to statistical errors and caps correspond to the systematic errors. The predictions from
ALICE Coll. Nature 588 (2020) 232-238(blue) and V III (green) for source sizes R p = R ! = 5 fm and R p = R ! = 2.5 fm are shown in (a) and (b) respectiv• Crucial to study source size dependence of correlation function
resolution dueon the correlationis negligible
compared with error
S channel from tü 𝑝Ω- correlation: a sign of 𝑎= is unknown
to afunctions
large
statisticalannelser 2022 effect [26]. Furthermore, the correlation from the21s-quarks from Ref.
statistical errors.
shapelowof the correlation
function for the backTo study the &BT effect is affectedby the collectiveon
flow throughthe→ Workingimprovementof single Ω purity𝑝> reach
the lattice QCD dathecandidates
fromtheside-bands
oftheinvariantmass
ground,odification of the source geometry. As a result, even for none)(e/r ) , wof !
were chosen in the range M< 1.665 GeV/c and M >entical pairs, the absoluteof C(q)respectto 𝑝> >1.2GeV/c with− magnitude
Purity~ with50%
forconventional
selectionb are positive, whi
1.679 GeV/c . These selected candidates were then combined with

ity is not always a useful measure to quantify the effect of
I in heavy-ion collisions. However, by taking a ratio of the

5

2

2

the proton tracks from the same event to construct the relative2−b4 r 2
5

−b5 r

2

state. Two more po
N! bound state and

13

288
Iritani et al. / Physics Letters
PHYSICAL
120,
212001
S.Gongyo et al., PRL 120,
212001REVIEW(2018) LETTERS
T.Iritaniet (2018)
al., PLB 792, 284-289 T.(2019)

𝜴𝜴

𝟏

𝑵𝜴

𝟓

𝑺𝟎

deuteron

𝑺𝟐

Fig. 5. The ratio of the effective range reff and the scattering length a0 as a funcFIG. 2. The ΩΩ phase shift δðkÞ in the 1S0 channel for
FIG. 3. The dimensionlessratio ofthe effective range reff and1tion of reff for by
N !(5 SHAL
and !!(calculation
S0 ) [7] (blue diamond) on thelattice,2 ) (red circle)• t=aPossible
ΩΩ
bound
state
for
𝐽
=
0
predicted
QCD¼ 16, 17, and18
asafunctionofthecenterofmasskinetic
3
1ΩΩ system inthescattering
lengthaasafunction
of
r
for
the
0
eff
as well as for N N ( S1 ) (purple up-pointing triangle) and N N ( S0 ) (green downpﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ
1S channel as well as for the spin-triplet NN system (the22thedatapointing
energy
E
¼
2
k
þ
m
.
−
2m
ü Interestingwith LHC RUN-3&4
0triangle) [37] in experiments.
CMΩΩto see
deuteron channel) and for the spin-singlet NN system (the− 100 times more MB events at ALICEwith detector
upgrade+0.16
channel).
TherefferrorΩΩ
is0.02the quadrature
aneutron-neutron= 1bar.26(for
0.01
)(+
(8)
0 = 5.30(0.44)(−0.01 ) fm,−0.01 ) fm,
ðΩΩÞ
þ 1.2
the Ω
statisticaland𝐾systematicin Eqs. (7) and (8).
− Bothreconstructionvia+Λ+& ΩΩ errors
correlationa mass¼ 4.6ð6ÞðÞ fm;
ð7Þ ΩΩof→0−0.5

functionin Pb-PbðΩΩÞ
þ 0.06reff¼ 1.27ð3Þð−0.03 Þ fm:

ð8Þ

where the central values and the statistical errors are estimated at
t /a = 12, while the systematic errors in the last parentheses are
estimatedfromquark
the central
valuesfor t /Thea = 11,13 and energy
14.
of multiple
sources[39].
binding
is

F
(
t
s

e
r
w
t

14

• Making efforts to search for multi-strange dibaryons at LHC energyü Possible (quasi-)bound states for 𝑁Ω & ΩΩ systems predicted by
HAL QCD calculations
ü Invariant mass reconstruction & 2 particle correlation withdaughter particles• Current status:
ü Almost excluded ΛΛ bound state by initial searches in RUN-1
ü No significant peaks for 𝐻 → Λ + Λ/𝑝 + Ξ & 𝑛Ω → Λ + Ξ in small
systems so far• Ongoing analysis & plansü Analysis with RUN-2 Pb-Pb data with more statistics− Working on improvement of purity for single Hyperons
ü 2 particle correlation measurements in Pb-Pb− Source size dependence of correlation function