Beam-energy scan in rela/vis/c heavy-ion collisions

Transcription

1 Beam-energy scan in rela/vis/c heavy-ion collisions ShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba Tomonaga Center for the History of the Universe (TCHoU) Contents CriAcal fluctuaaon CollecAve expansion VorAcal, Chiral magneac fluid Future plan NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 1

2 QCD phase diagram and Cri/cal Point FAIR, NICA, HIAF, J-PARC Cross over phase transiaon at high T and small µ B 1 st order phase transiaon at high µ B CriAcal end point search via RHIC beam energy scan program New direcaon towards high-density maxer in future fasiliaes NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 2

3 Baryon density and chemical freeze-out GeV Au+Au Collisions STAR: ; Phys. Rev. C74, (2006) (MeV) T ch % 30-40% 60-80% Cleymans et al. Andronic et al. Grand Canonical Ensemble (Yield Fit) µ (MeV) B Baryon density increases with reducing beam energy. Baryon density peaks at about 8GeV based on model. NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 3

4 Net-proton as a proxy for conserved net-baryon fluctua/on full phase space acceptance cut STAR, QM15 possible signal from criacal point which could be taken as a change of correlaaon length with 4 th order cumulant. NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 4

5 from Net-Baryon towards net-strangeness Net Kaon cumulant raao Net Lambda cumulant raao STAR: STAR, QM18 Trying to get signal from net-strangeness to be compared with net-proton and netcharge results NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 5

6 Off-diagonal cumulants among net-proton, net-kaon and net-charge p - k p : net-proton k : net-kaon Q : net-charge ch - k ch - p STAR, QM18 NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 6

7 6 th order cumulants of net-proton and net-charge Higher order cumulants are expected to be more sensiave to the criacal fluctuaaon than lower orders. STAR, QM18 STAR, QM17 NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 7

8 Unfolding of unkown and cri/cal net-distribu/on N(gen., paracle A) Unknown Exp. input U in Test Exp. input S in CorrecAon to S in S next = S in + α Cf 1 st Aher iteraaons S next S final 50 th N(gen., paracle B) Response matrix N(rec., paracle A) Exp. output U out N(rec., paracle B) EMMI workshop in Wuhan 2017 Test Exp. output S out Diff. of outputs Df = U out - S out Reversed response matrix CorrecAon factor Df Cf volume fluctuaaon can be included as a part of response matrix NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 8

9 Unfolding of net-proton distribu/on based on GEANT detector response matrix STAR, QM18 NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 9

10 STAR: Directed Flow v 1 Directed flow v 1 and its slope with respect to rapidity NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 10

11 v 1 slope (dv 1 /dy) of quark based on the quark coalescence v1 trans. u(d) = v1 net p v1 pbar (3 - N trans. u+d )/3 N trans. u+d STAR: STAR, QM18 transported quark assumpaon works at lower energy produced quark assumpaon works at high energy N trans. u+d NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 11

12 v 2 evolu/on with beam energy and quark coalescence Squeeze out and sign change Mass splimng Number of quark scaling STAR: , Phys. Rev. LeX. 116 (2016) (qqq) (qq) (sss) (ss) NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 12

13 mass dependence of v 2 and evolu/on with beam energy STAR: increasing radial and ellipac flow with beam energy NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 13

14 beam energy dependence of v 2 in small system at d+au collisions d+au collision PHENIX: , Phys. Rev. C96 (2017) NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 14

15 beam energy and mul/plicity dependence of v 2 in small system different methods (no-subtr., near-side scaled subtr., templ. fit) --- STAR, QM18 non-flow dominated over-subtracted? over-esamated? reference fimng to be in the middle NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 15

16 Longitudinal de-correla/on of event plane of Φ 2 (top) and Φ 3 (bot.) STAR, QM18 r 2 (η) for Φ 2 r 3 (η) for Φ 3 stronger in r3 than in r2 larger energy dep. for r2 in central collisions different centrality dep. between r2 and r3 opposite effect on η/s between r2 and r3 NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 16

17 Global polariza/on via Lambda decay z NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 17

18 Lambda polariza/on centrality dep. Strong centrality dependence No significant p T and η dependences p T dep. η dep. NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 18

19 Lambda polariza/on out-of-plane y φ x in-plane A ch = N + - N - N + + N - Azimuthal angle dependence STAR, QM18 Charge asymmetry dependence NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 19

20 Lambda longitudinal-local polariza/on STAR, QM18 NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 20

21 Chiral Magne/c Effect via γ os,ss correlator STAR, QM18 γ = < cos (φ A + φ B 2Φ RP ) > R.P. R.P. Phys. Rev. LeX. 113 (2014) B NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 21

22 Chiral Magne/c Effect via R.P. projected event-by-event charge asymmetry distribu/on <sinφ + > - <sinφ - > with charge shuffling + cos term normaliza/on --- Ajit correlator --- STAR, QM18, Chirality workshop 2018 NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 22

23 Chiral Magne/c Wave via charge asymmetry of v 2 Δv 2 Phys. Rev. LeX. 114 (2015) B charge dependent v 2 (Δv 2 ) vs charge asymmetry of event (A ch ) STAR, QM18 v 2{+}, v 2{-} R.P. A ch STAR, QM18 Δv 2 Δv 3 NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 23

24 STAR experimental detector upgrade for BES2 Cri/cal Point NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 24

25 STAR Experiment at RHIC Beam Energy Scan --- Program Phase inner TPC readout-chamber upgrade (itpc) Event Plane Detector (EPD) TPC EPD etof End-cap Time-of Flight (etof) Fixed-target mode EPD NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 25

26 Summary CriAcal fluctuaaon CollecAve expansion VorAcal, Chiral magneac fluid Future plan (including FAIR,NICA,HIAF, J-PARC) FAIR at GSI (Darmstadt, Germany) J-PARC at JAEA/KEK for heavy-ion collisions (Tokai, Japan) NFQCD2018, 6/Jun/2018, Kyoto ShinIchi Esumi, Univ. of Tsukuba, TCHoU 26