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Dipali Pal Vanderbilt University (for the PHENIX Collaboration). f- Meson Production in d - Au Collisions at √s = 200 GeV. Outline. Physics motivation PHENIX experiment Particle identification Data analysis f meson reconstruction Corrections

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f meson production in d au collisions at s 200 gev

Dipali Pal

Vanderbilt University

(for the PHENIX Collaboration)

f-Meson Production in d - Au Collisions at √s = 200 GeV

Hot Quarks 2004, Taos Valley

outline
Outline
  • Physics motivation
  • PHENIX experiment
  • Particle identification
  • Data analysis
    • f meson reconstruction
    • Corrections
  • Results ( f  K+K- and f e+e-)
  • Summary and outlook

Hot Quarks 2004, Taos Valley

physics motivation
Physics motivation

f mesons

  • Chiral symmetry restoration and medium effects

- mass shift, width broadening

- branching ratios in K+K- and e+e- decay channel

 Simultaneous measurement of f K+K- and f  e+e-

  • Strangeness production

- f meson yield

  • Particle production mechanism

- Rcp, elliptic flow

  • Au – Au & d – Au collisions
    • Distinguish between hot and cold partonic matter
    • Evolution of medium properties with density and temperature
    • Probing nuclear effects

Hot Quarks 2004, Taos Valley

phenix setup
PHENIX Setup

Collision vertex and centrality:

Beam-beam Counter

K-

K+K-

Tracking : DC – PC1 – PC3

Momentum

K+ K-

  •  K+K-

Kaon identification:

TOF: |Dh| < 0.35, Df = 45o

PbSc (East): |Dh| < 0.35, Df = 45o

PbSc (West): |Dh| < 0.35, |Df| = 90o

K+

K+K-

fK+K-

Minimum-bias

|zVertex| < 30 cm

Nevt = 54 M

f e+e-

ERT_Electron trigger

|zvertex| < 30 cm

Nevt (ERT) = 31M

 1.9 G Minimum bias

f e+e-

Electron identification: RICH + EMC

|Dh| < 0.35, Df = 90o, both arms

Hot Quarks 2004, Taos Valley

kaon identification
Kaon identification

PbSc East and West:

0.3 < p(GeV/c) < 1.0

st ~ 450 ps

Time of flight (TOF):

0.3 < p (GeV/c) < 2

st = 130 ps

Hot Quarks 2004, Taos Valley

electron identification

Energy / Momentum

Electron identification
  • Electron PID cuts
    • NRICH PMT  2
    • 0.5<E/p<1.5
    • E - from EMC
    • p from tracking

Hot Quarks 2004, Taos Valley

data analysis and corrections
Data analysis and corrections
  • Same event K+K- and e+e- invariant mass distributions (R).
  • Combinatorial background (CB)

Event mixing within same centrality and Zvertex

 Normalization to 2√N++N—

  • Signal = R - CB
  • Acceptance correction:

 PHENIX Single particle Monte-Carlo simulation

- Event generation + Detector hit + Detector response + offline analysis

  • Other experimental quality control correction:

 Run (time) dependent corrections

Hot Quarks 2004, Taos Valley

invariant mass distributions
Invariant mass distributions

fà K+K- @ d – Au, √sNN = 200 GeV

K+ and K- are selected from TOF

fà e+e- @ d – Au, √s = 200 GeV

Mixed

Background

Counts per 1 MeV/c2 bin

Counts per 10 MeV/c2

S ~ 120

S/B = 1/4

G = 4.409 ± 0.711 MeV/c2

e+e- invariant mass (GeV/c2)

Hot Quarks 2004, Taos Valley

f meson transverse mass spectra i
f meson transverse mass spectra (I)

Fitted with exponential function in mT

e+e-

1/2mT dN/dmTdy(GeV/c2)-2

PHENIX Preliminary

PHENIX Preliminary

mT(GeV/c2)

PHENIX Preliminary

PHENIX Preliminary

dN/dy=0.0560.015(stat) 50%(syst)

T=326 94(stat)  53%(syst) MeV

Hot Quarks 2004, Taos Valley

meson transverse mass spectra ii
meson transverse mass spectra (II)

SPS result

Central Pb-Pb 158 A GeV

NA49:

f K+K- T = 305 MeV

dN/dy ~ 2.35

  • NA50:
  •  m+ m-T = 227 MeV
  • No specific quote of dN/dy
  • Integrating the mT spectrum gives
  • dN/dy ~ 13

D. Rohrich et al, J Phys. G 27 (2001) 355

Hot Quarks 2004, Taos Valley

slide11

Minimum-bias mT distribution of f (II)

dN/dy

f  K+K-

T

f e+e-

K+K-

1/2mT dN/dmTdy(GeV/c2)-2

K+K-

e+e-

e+e-

PHENIX Preliminary

PHENIX Preliminary

PHENIX Preliminary

  • f yields in d-Au collisions in K+K-

and e+e- channels are consistent with

each other

MT(GeV/c2)

Overall fit

dN/dy~ 0.0485

T~408

2/DOF=6.7/7

Hot Quarks 2004, Taos Valley

comparison between f yields in d au and au au collisions f k k
Comparison between f yields in d-Au and Au-Au collisions(f  K+K- )

(Preliminary)

(Preliminary)

Inverse slope remains

constant in Au-Au and

d-Au collisions.

  • yield increases from d-Au to Au-Au system

Hot Quarks 2004, Taos Valley

invariant mass spectra from tof and pbsc analysis
Invariant mass spectra from TOF and PbSc analysis

West arm (PbSc)

Full east arm ( TOF + PbSc)

Work in progress

Work in progress

  • Factor of ~4 more statistics is now available by including

the PbSc detectors in east and west arm.

  • Scope of centrality dependence studies.

Hot Quarks 2004, Taos Valley

summary
Summary
  • First simultaneous measurement of f  K+K- and f  e+e- in d-Au collisions at RHIC.

f  K+K-

f  e+e-

(PHENIX Preliminary)

(PHENIX Preliminary)

  • dN/dy=0.056.015(stat) 50%(syst)
  • T=326 94(stat) 53%(syst) MeV

 Consistent with each other within errors.

  • f yield jumps from d-Au minimum-bias to Au-Au peripheral
  • collisions. Then it increases slowly upto Au-Au mid-central,
  • finally saturates.

Hot Quarks 2004, Taos Valley

outlook
Outlook
  • Extended f  K+K- measurement in d-Au collisions with kaons identified with PbSc modules.

 Total yield increases by almost a factor of 4.

 Better understanding of the systematics is possible.

 Centrality dependence of f yield

 Particle ratio

 Rcp measurements.

Hot Quarks 2004, Taos Valley

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