Hard Probes and. Properties of QGP in HIC

Transcription

1 Hard Probes and 1 Properties of QGP in HIC Ben-Wei Zhang ( 张本威 ) 华中师范大学 Central China Normal University QPT2017,Xi an Jiaotong University, 2017/7/21-23

2 2 Outline Introduction Several Hard Probes 1) Leading hadron productions 2) Full jet observables 3) Gauge boson production: CNM effects Summary

3 3 Deconfinement and QGP It would be interesting to explore new phenomena by distributing high energy or high nuclear density over a relatively large volume. T. D. Lee (1978) Lattice QCD predicts phase of thermal QCD matter with sharp rise in number of degrees of freedom near T c =170MeV.

4 Hard Probes: leading hadrons 4

5 Hard Probes: leading hadrons 5

6 6 Hard Probes: full jets Jet Jet

7 7 Hard Probes: full jets Jet Jet

8 8 Jet quenching Parton energy has been proposed as an excellent probe of the hot/dense matter created at HIC. g g T T g Xin-Nian Wang, M. Gyulassy, PRL68(1992)1480

9 9 Jet quenching at RHIC and LHC R AA = Yield AA / N Yield binary pp AA

10 Large p T hadrons in HIC 10

11 Modified Fragmentation Func. at Twist-4 The parton energy loss due to medium-induced gluon radiation has been calculated with higher twist approach. X Guo, X N Wang, PRL(2001); X Guo, X N Wang, NPA (2001); BWZ, X N Wang, NPA(2003) ; BWZ, E Wang, X N Wang, PRL (2004) 11 2 A 1+ z Tqg ( xx, L ) CA2πα S γ ( zx, L ) = + (virtual) A (1 z) f ( x) N + q c

12 Comparisons with data at RHIC and LHC 12 Z. Liu,H. Z. Zhang, BWZ and E. Wang, Eur.Phys.J. C (2016)

13 η in heavy-ion collisions at NLO Production of eta meson in HIC has been calculated; η/π0 ratio is almost same (~0.5) for p+p, Au+Au and Pb+Pb collision. 13 W Dai, X Chen, BWZ, E Wang, Phys. Lett. B 750 (2015) 390

14 η in heavy-ion collisions at NLO Production of eta meson in HIC has been made; η/π0 ratio is almost same (~0.5) for p+p, Au+Au and Pb+Pb collision 14 ALICE, Hard Probes 2016 W Dai, X Chen, BWZ, E Wang, Phys. Lett. B 750 (2015) 390

15 ρ production in A+A at NLO A broken SU(3) model has been utilized to get ρ FFs in p+p. Dominant contributions of quark fragmentations both in p+p and in A+A. 15 W Dai, BWZ, E Wang, arxiv:

16 Production of ϕ in HIC at NLO 16 more detial, see Wei Dai s talk, W Dai, BWZ, H Zhang, E Wang,arXiv:

17 Jets in HIC 17

18 What is a jet? 18 A jet is a spray of final-state particles roughly moving in the same direction and defined by jet finding algorithms. At LO pqcd, jet parton. In pqcd local-parton-hadron duality (LPHD) is used Jet: more precise and powerful

19 Eloss: From hadron to jets 19 parton E hadron s p h Vitev, Wicks, BWZ, JHEP (2008)

20 Inclusive jets in A+A at NLO 20 I Vitev, BWZ,PRL (2010). Y He, Vitev, BWZ, PLB (2012) ATLAS, PLB (2013)

21 Inclusive jet in Pb+Pb: Exp. 21 Inclusive jet Raa has also recently measured by ALICE. ALICE, PLB (2015), arxiv:

22 22 Measuring Dijets in Pb+Pb Jet quenching at LHC has been observed for the first time in dijet productions at Pb+Pb by ATLAS and CMS ATLAS, arxiv: , PRL (2011); CMS, arxiv: , PRC(2012)

23 23 Quenching effect on dijet Pythia + Eloss Eloss G Y Qin, B Muller, PRL(2011) Y He, Vitev, BWZ, PLB (2012)

24 New development on dijet: 24 NLO+Resummation more detail, Shu-Yi Wei s talk L Chen, G Y Qin, S Y Wei, B W Xiao, H Z Zhang, arxiv:

25 Angular correlations of 25 di-hadron and jet-hadron: di-hadron Han-Zhong Zhang s talk jet-hadron L Chen, G Y Qin, S Y Wei, B W Xiao, H Z Zhang, arxiv:

26 26 Tagged jet production in HIC golden channel

27 Asymmetry in photon + jet 27 Pb+Pb p+p CMS, PLB(2013) Dai, Vitev, BWZ, PRL(2013)

28 photon+ hadron with CoLBT-hydro 28 W Chen, S Cao, T Luo, L G Pang, X N Wang, arxiv:

29 29 Z 0 +Jet in pp and PbPb Neufeld, Vitev, BWZ, PRC (2011).

30 Z 0 + jet in A+A: asymmetry 30 Z B Kang, Vitev, Hongxi Xing, arxiv:

31 W + jet in A+A at NLO 31 S Zhang, S Y Chen, BWZ, E Wang, in preparation

32 32 Jet substructure in HIC: world inside a jet

33 Jet shape in HIC 33

34 LO & Resummation: p+p An analytic approach to the energy distribution of jet Seymour, M. (1998) Jet shape at LO with the acceptance cut Collinear divergence requires Sudakov resummation: 34

35 Total jet shape in HIC 35 Medium-induced jet shape is much broader than the jet shape in p+p I Vitev, S Wicks, BWZ (2008)

36 Jet shapes: NLL+NLO 36 H-N Li, Z Li, C P Yuan, PRL (2011); PRD (2012) S Chen, Z Li, BWZ, E Wang, in progress

37 Jet shape: contribution 37 with hydro Guang-You Qin s talk Yasuki Tachibana, N B Chang, G Y Qin, arxiv:

38 38 Jet charge in p+p Proposed by Feynman & Field (1978) Very useful to discriminate q/g Krohn, Schwartz, T. Lin, Waalewijn, PRL (2013) Q j 1 = q κ ( p ) Tj κ (0.1,1) i Tr i ( p i T ) κ S Y Chen, BWZ, E Wang, arxiv:

39 39 Jet charge in A+A Rcp of jet charge in A+A is larger than unity. Very useful to discriminate q/g R CP = Q Q j j PbPb _ 0 10% PbPb _ 60 80% more detail, Shi-Yong Chen s talk S Y Chen, BWZ, E Wang, arxiv: ; in preparation

40 Other jet substructures 40 Jet FF Girth Jet mass Splitting

41 Gauge boson production: Cold Nuclear Medium Effects 41

42 CNM effects with gauge boson prod. Gauge boson production provides an excellent probe of IS cold nuclear matter (CNM) effects DYNNLO pqcd program q l m W/Z ~ GeV q Z 0 l + W/Z 3 ~1 m ~10 fm/c Hot/Dense QCD matter Peng Ru, BWZ, L Cheng, E Wang, W Zhang,J. Phys. G42(2015) Peng Ru, BWZ, E Wang,W Zhang,Eur. Phys. J. C75 (2015)

43 Z and W boson in HIC up to NNLO npdfs:dssz, EPS09 43 P Ru, B W Zhang, L Cheng, E Wang, W Zhang,J. Phys. G42(2015)

44 Z and W boson with KP npdf in p+pb Productions of Z and W in p+pb at the LHC has also studied with KP npdfs from a microscopic motivated model. 44 Peng Ru, Kulagin, Petti, BWZ,PRD94 (2016)

45 Z and W boson with KP npdf in p+pb The results with KP npdfs give overall relatively smaller χ 2 when confronting with 10 different data sets. 45 Peng Ru, Kulagin, Petti, BWZ,PRD94 (2016)

46 Production of isolated photon in p+a Isolated photon and its tagged jet in p+a at NLO has been investigated to study CNM effects 46 G Y Ma, W Dai, BWZ, E Wang, in preparation

47 Summary 47 We discussed productions of leading hadrons and full jet observables with jet quenching. Gauge boson productions are studied to investigate cold nuclear matter (CNM) effects. Calculations of pqcd with final-state jet quenching and initial-state CNM can explain a huge amount of data on hard probes with a unified picture. More studies are needed. Many 47 Thanks!

48 48

49 Jet shapes in HIC with AMPT 49 Guo-Liang Ma, PRC 89, (2014)

50 Non-perturbative effects 50 Non-perturbative effects: hadronization & underlying event. Two effects will go in opposite direction: partial cancellation between splash-out effect and splash-in effect. H Li, BWZ, E Wang (2013)

51 Kulagin and Petti (KP) nuclear PDF KP npdf: average contribution from bound proton [off shell (OS)]: nuclear meson exchange currents (MEC): coherent interact. of virt. boson with nucl. target [Nucl. Shad.(NS)]: S. A. Kulagin, R. Petti, NPA765 (2006) 126; PRC90 (2014)

52 Photon + jets in a Hybrid model 52 Casalderry-Solana, et al, arxiv:

53 Peng Ru, BWZ, E Wang,W Zhang,Eur. Phys. J. C75 (2015) 426 Z and W in Pb+Pb for Future HIC 海夸克的贡献变得更大, 计算了重离子碰撞中 Z 和 W 规范玻色子 53