Measurement of D-meson azimuthal anisotropy in Au+Au 200GeV collisions at RHIC Michael R. Lomnitz Kent State University Lawrence Berkeley National Laboratory.

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Presentation transcript:

Measurement of D-meson azimuthal anisotropy in Au+Au 200GeV collisions at RHIC Michael R. Lomnitz Kent State University Lawrence Berkeley National Laboratory for the STAR Collaboration

Motivation Charm quarks: Produced early in heavy ion collisions at RHIC, through hard scattering Experience the whole evolution of the system -> good probe for medium properties Physics interest: High p T : test different energy loss mechanisms: radiative vs collisional At low p T : extract medium properties from motion of heavy quarks in medium (Brownian motion), e.g. diffusion coefficient Quark Matter 2015, Kobe, Japan X. Zhu, et al, Phys. Lett. B647, 366(2007). 2

Recent developments and understanding RHIC and LHC: D-meson R AA suppression at high p T : strong charm-medium interactions D 0 v 2 LHC results are compatible with light flavor v 2, charm thermalized? v 2 and R AA can be used simultaneously to constrain models What is occurring at low p T at RHIC? Low p T v 2 is especially sensitive to the partonic medium: scattering strength, transport properties Quark Matter 2015, Kobe, Japan For R AA talk see G. Xie (Monday 15:10) STAR:PRL 113 (2014) PHENIX:PRL 101 (2008) ALICE: PRL 111 (2013) arXiv: (2015) 3

STAR experiment TPC: Tracking, PID (dE/dx) TOF: PID (1/β) -1<η<1, 0≤ ϕ <2π VPD: Min-Bias trigger Quark Matter 2015, Kobe, Japan Heavy Flavor Tracker: Silicon Strip Detector Intermediate Silicon Tracker PiXeL 4

STAR experiment TPC: Tracking, PID (dE/dx) TOF: PID (1/β) -1<η<1, 0≤ ϕ <2π VPD: Min-Bias trigger Quark Matter 2015, Kobe, Japan 5 Heavy Flavor Tracker: <50  m pointing resolution for 750MeV/c Thinned Monolithic Active Pixel Sensor technology Low material budget (0.4% X 0 for inner most layer) See talk by G. Contin (Tuesday 15:00)

D 0 reconstruction Direct topological reconstruction through channel: Greatly reduced combinatorial background (4 orders of magnitude) Topological cuts optimized using TMVA (Toolkit for Multivariate Analysis) Quark Matter 2015, Kobe, Japan 6

D 0 reconstruction using HFT Significance greatly enhanced compared to STAR previous, results. w/o HFTw HFT # events(MB) analyzed 1.1 B780 M sig per billion events STAR Preliminary STAR 2010/11 STAR: PRL 113 (2014)

v 2 : Event plane method Quark Matter 2015, Kobe, Japan Event plane reconstructed using charged hadrons within STAR TPC acceptance (|  |<1) Corrected for detector acceptance Yields in  bins corrected for event plane resolution  gap of ~0.15 used in event plane reconstruction Non-flow estimated from measured D-h correlations in p+p 200GeV 8 A.M. Poskanzer, et al. PRC 58 (1998) 1671 STAR: PRL 93 (2004) p+p Au+Au STAR Preliminary

v 2 : Two particle correlation Quark Matter 2015, Kobe, Japan Event by event v 2 for foreground and background h 1 in  0 Statistically subtract background from foreground to obtain D 0 v 2 Corrected for detector acceptance 9 A.M. Poskanzer, et al. PRC 58 (1998) 1671 STAR Preliminary For details see poster by L. He (Exhibition space 4)

Direct topological reconstruction through channel: Yield in plane and out of plane obtained following event plane method D +/- reconstruction Quark Matter 2015, Kobe, Japan D +/- yield in and out of plane 10 STAR Preliminary

D Meson v 2 Quark Matter 2015, Kobe, Japan 11 D 0 azimuthal anisotropy significantly different from zero for p T > 2 GeV/c (  2 /n.d.f. = 17.5/4 ) B->D feed down is negligible at RHIC energies (<5% relative contribution) STAR Preliminary

D Meson v 2 Good agreement between EP and 2 PC methods within systematics Quark Matter 2015, Kobe, Japan 12 STAR Preliminary

D Meson v 2 D +/- v 2 compatible with D 0 albeit within large error bars Quark Matter 2015, Kobe, Japan 13 STAR Preliminary

Comparison to experiment Quark Matter 2015, Kobe, Japan 14 D 0 v 2 is below light hadrons for 1 < p T < 4 GeV/c (  2 /n.d.f. = 9.6/3 ) STAR Preliminary STAR:PRC 77 (2008) 54901

Model comparison: TAMU Full T-matrix treatment, non- perturbative model with internal energy potential Diffusion coefficient extracted from calculation 2  T x D = 2-7 Good agreement with D 0 meson v 2 at low p T, data favors model including c quark diffusion in the medium ( w/ c diff.  2 /n.d.f. = 1.8/5 ) ( w/o c diff.  2 /n.d.f. = 7.4/5 ) -   tests done to v 2 Quark Matter 2015, Kobe, Japan 15 Theory: arXiv: (2015) & private comm. STAR: PRL 113 (2014) STAR Preliminary

Model comparison: SUBATECH pQCD+HTL calculation with latest EPOS3 initial conditions Diffusion coefficient extracted from calculations 2  T x D ~ 2-4 Good agreement between model and experiment for both v 2 and R AA in entire p T range (  2 /n.d.f. = 2.8/5 ) -   tests done to v 2 Quark Matter 2015, Kobe, Japan 16 Theory: arXiv: (2015) & private comm. STAR: PRL 113 (2014) STAR Preliminary

Model comparison: Duke Diffusion coefficient is a free parameter, fixed by fitting to R AA at high p T Input value for diffusion coefficient 2  T x D = 7 fixed to fit LHC results Model with 2  T x D = 7 doesn’t describe the magnitude of v 2 in experimental data Quark Matter 2015, Kobe, Japan 17 Theory: arXiv: & private comm. STAR: PRL 113 (2014) STAR Preliminary

Charm diffusion coefficient Quark Matter 2015, Kobe, Japan 18 Theory: arXiv: & private comm. Scan different values of the diffusion coefficient to find best agreement to data Best agreement for diffusion coefficient 2  T x D = ~1 – 3 This model seems to underestimate the data for p T > 3 GeV/c STAR Preliminary

Diffusion coefficient Quark Matter 2015, Kobe, Japan Compatible with models predicting a value of diff. coefficient between 2 to ~10 Lattice calculations, although with large uncertainties, are consistent with values inferred from data 19

Outlook Run 14: Full statistics available soon Run 15: Full aluminum cables for inner layer of PXL p+p and p+A data sets with HFT Run 16: Full aluminum cables for inner layer of PXL Factor 2 -3 improvement for D 0 1 GeV -> centrality dependence for v 2 Quark Matter 2015, Kobe, Japan 20 YearSystemEvents(M B) Run 14: Au+Au1.2 B Run 15: p+p1 B p+Au0.6 B Future Run 16: Au+Au2 B

Summary D 0 v 2 is finite for p T > 2.0 GeV/c D 0 v 2 lower than light hadrons for 1< p T < 4.0 GeV/c Data favor model scenario where charm quarks flow D 0 v 2 and R AA can be described simultaneously by models and are consistent with values of 2  TxD between 2 and ~10 Looking forward to improved statistics in year 2016 Quark Matter 2015, Kobe, Japan 21 STAR Preliminary

Quark Matter 2015, Kobe, Japan 22 Thank you!

Back ups Quark Matter 2015, Kobe, Japan 23

Diffusion Coefficient from DUKE Quark Matter 2015, Kobe, Japan 24 STAR Preliminary

Comparison to ALICE Quark Matter 2015, Kobe, Japan 25 STAR Preliminary

Quark Matter 2015, Kobe, Japan 26 Mass Effect STAR Preliminary