1

QM2018 results fromBeam Energy Scan
Tetsuro Sugiura
post QM meeting
Jun. 30, 2018 @ Nagoya University• BESⅡOutline

2- BES Ⅱ program and detector upgrade, STAR, Q.Yang (talk)- FXT test run results STAR, Y.Wu (talk)• BES1, ﬂow, small system and HBT- Directed ﬂow of quarks, STAR, Gang.Wang (talk)- Longitudinal ﬂow decorrelation in 200GeV STAR, Maowu Nie (talk)- Collectively in Small Systems, STAR, Shingle Huang (talk)- Geometry and Dynamics seen by the Femtoscopy, STAR, Sebastian Siejka (talk)• BES1, ﬂuctuation- Net-lambda cumulants, STAR, N.Kulathunga (poster) T.Nonaka (talk)- Oﬀ-diagonal cumulants STAR, A.Chetterjee (poster) T.Nonaka (talk)- 6th order cumulant of net-charge, STAR, T.Sugiura (poster) T.Nonaka (talk)- Net-proton cumulants by unfolding at 19.6 GeV , STAR, T.Nonaka (talk)• BES1, Vorticity, CME, and Thermodynamics- Global Hyperon Polarization in 200 GeV Au+Au, STAR, Takafumi Niida (talk)- Chiral Magnetic Eﬀect at RHIC Top Energy, STAR, Jie Zhao
- Triton Production in Beam Energy Scan, STAR, Pens Liu (talk)

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Beam Energy Scan PhaseⅡ(BES-Ⅱ)

3STAR, Q.Yang (talk)•RHIC BESⅡ:10-25 times more statistics and detector upgrade→Dramatically reduce the uncertainties.

•Precise map the QCD phase diagram 200<μB<720 MeV

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Detector upgrades

4STAR, Q.Yang (talk)
Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Fixed target test run for Au+Au at sNN=4.9 GeV•5First π direct ﬂow at this energy range,turning up towards lower energy. Dedicated
FXT runs (3.0-7.7 GeV) in 2019-2020 toexplore high baryon density regime.
STAR, Y.Wu (talk)

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Directed ﬂow of quarks
STAR, Gang.Wang (talk)6Assumption• anti-p, anti-Λ and K are all producedin collision.
• For anti-Λs, prediction using coalescencesum rule agrees with measured v1 above
11.5 GeV but disagree at 7.7 GeV.
STAR, Phys. Rev. Lett. 120 (2018) 62301

v1 of transported u(d) ispositive for all beam energies.
• A minimum at 14.5 GeV.
•Evidence of softest point?

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Longitudinal Flow Decorrelation in 200GeV

STAR, Maowu Nie (talk)7

Asymmetry of aﬂow magnitude

Torque/twist of anevent plane

Stronger longitudinal ﬂow decorrelation at RHIC than at LHC• Hydro calculations can not simultaneously describe LHC and RHIC data.
•Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

d+Au 200GeV

Collectivity in Small Systems

8A near-side ride is obsessed in the HM d+Au• A Fourier function is employed to extract the Vn,n•STAR, Shengli Huang (talk)•Diﬀerent V2,2 from diﬀerent methods to correct for non-ﬂow background inp/d+Au collisions. Be careful about the assumption ions of the methods.

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Geometry and Dynamics seen by the Femtoscopy 9STAR, Sebastian Siejka (talk)p-p correlation• Lighter particles emitted closer to• Energy and centrality dependenceof HBT with BES data.
Post QM meeting 2018/6/30 @Nagoya

the center of the source than heavyparticles.
Tetsuro Sugiura Univ. of Tsukuba

Net-lambda cumulants•

10

Strange quarks freeze-out isearlier than that of light quarks?

•Net-lambda cumulants weremeasured for the ﬁrst time.

•C2/C1 is close to HRG model
results with Kaon FO condition,and far away from those ofcharge and proton.

STAR,N.Kulathunga (poster)
T.Nonaka (talk)

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Oﬀ-diagonal cumulants•

Oﬀ-diagonal cumulants ofconserved charges will provide
additional constrains on the11STAR,A.Chetterjee (poster)
T.Nonaka (talk)freeze-out conditions.
•First measurement of oﬀdiagonal cumulants.

•Normalized p-k correlation is positive at lower
energies negative at higher energies.

•Signiﬁcant excess is observed in Q-k and Q-p
w.r.t the Poisson baseline and UrQMD.

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

6-th order cumulant of net-charge ﬂuctuation•12

According to theoretical predictions, the 6th-order cumulants of net-variable
may be the signal of cross-over transition.
(χ6/χ2<0 near the Tpc)

•C6/C2 is consistentwith zero within
statistical uncertainty
for all centralities
STAR, T.Sugiura (poster) T.Nonaka (talk)

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Net-proton cumulants by unfolding at 19.6 GeV

13STAR, T.Nonaka (talk)In current ﬂuctuation analysis, eﬃciency
corrections are based on Binomialdistribution.
• However, actually the detector eﬃciency may
not be binomial.
• Unfolding was done using response matrix
based on embedding at 19.6GeV.
•STAR, T.Nonaka (talk and poster)

Systematic suppression isobserved for C2 and C3 withrespect to the results ofeﬃciency correction assuming
binomial eﬃciencies.
• C4, C3/C2 and C4/C2 areconsistent within large
systematic uncertainties
limited by embedding samples.
•Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Global Hyperon Polarization in 200 GeV Au+Au

14STAR, Takafumi NiidaNew!

•First observation of Λ global
polarization at 200GeVPost QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Chiral Magnetic Eﬀect at RHIC Top Energy

15SpinMomentum

Nc ejV =µA B
22⇡=γSTAR, PRL 103,251601 (2009)
STAR, Jie Zhao•

Isolate possible CME signal in inclusive Δγ by diﬀerent methods.

•Dedicated isobar run this year completed, blind analysis for CME studies being conducted.

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Triton Production in Beam Energy Scan

16STAR, Pens Liu (talk)First results of triton production inAu+Au collisions at BES energy.
• Non-monotonic energy dependenceof neutron density ﬂuctuation•n = h n2 i/hni2
Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

BES2 Plan17

http://www2.yukawa.kyoto-u.ac.jp/~nfqcd2018/Slide/Esumi.pdf

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

Summary18

A lot of interesting results from BES1.
- ﬂow, small system, femtoscopy, ﬂuctuation, vorticity and so on.
• Detector upgrade and test run of BES2 are ﬁnished.
- Probably a lot of new BES2 results will be reported from next QM.
•Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba

19Back up

Post QM meeting 2018/6/30 @Nagoya

Tetsuro Sugiura Univ. of Tsukuba