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UC Davis June 16-21 st 2008 1 Rosi Reed Low Energy Test Run Results Rosi Reed University of California at Davis.

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Presentation on theme: "UC Davis June 16-21 st 2008 1 Rosi Reed Low Energy Test Run Results Rosi Reed University of California at Davis."— Presentation transcript:

1 UC Davis June 16-21 st 2008 1 Rosi Reed Low Energy Test Run Results Rosi Reed University of California at Davis

2 UC Davis June 16-21 st 2008 2 Rosi Reed Introduction Event quality Beam Pipe Events – Spectra – HBT Beam Profile Analysis 2

3 UC Davis June 16-21 st 2008 3 Rosi Reed Summary 9 GeV Test Run 3 5.5 % with Vertex Yellow = cogged at Phenix 3.3% with Vertex r < 2 cm

4 UC Davis June 16-21 st 2008 4 Rosi Reed Multiplicity – Cut on Events heading into the TPC 30% Central 62.4 GeV points are scaled to match 3.2 GeV points at Nch = 13 Au-Al Au-Al + Alpha-Al An increased yield in low multiplicity events could be the result of alpha particles from Au break-up hitting the beam pipe

5 UC Davis June 16-21 st 2008 5 Rosi Reed Au-Al HBT Analysis – Rigidity π+π+ π-π- p t d

6 UC Davis June 16-21 st 2008 6 Rosi Reed Some Calculations – Au-Al Events

7 UC Davis June 16-21 st 2008 7 Rosi Reed Eta for Au-Al Events 30% Central All 30-100% Central Events with a Negative Average Eta Flipped for Graphs 2-4 1 2 4 3 Increase at Eta = 0 from Spectators from Al

8 UC Davis June 16-21 st 2008 8 Rosi Reed Eta for Au-Al Events 30% Central Proton 30% Central Pion 30-100% Central Proton 30-100% Central Pion PID done through nSigma cut

9 UC Davis June 16-21 st 2008 9 Rosi Reed Pion+ Proton Yield for Au-Al Events y bin = 0.5 around y cm No efficiency corrections made T ~ 80 +/- 2 MeVT ~ 91 +/- 3 MeV T ~ 99 +/- 4 MeV

10 UC Davis June 16-21 st 2008 10 Rosi Reed Proton/Pion Ratio for Au-Al Events Increase in p vs pi at y = 0 comes from Al spectators

11 UC Davis June 16-21 st 2008 11 Rosi Reed Au-Al HBT Analysis (root S NN = 3.2) Event quality cuts: – Vr > 2 cm (Not Au+Au collisions) – |Vz| > 75 cm (Not Au+Be collisions) – Vz*TotalEventPz < 0 (Events “into” TPC) – Events with Pz < 0 flipped (pz = pz*-1) – Multiplicity > 10 (30% Central) Track Quality cuts: – Assumed all negatively charged tracks were pions – nHits/nPossHits > 0.5 for either TPC or FTPC

12 UC Davis June 16-21 st 2008 12 Rosi Reed Au-Al pi- HBT Analysis

13 UC Davis June 16-21 st 2008 13 Rosi Reed Beam profile vs time Analyzed Vx vs Vy distributions vs time for – Run 72 (13:26:02 – 28:25) – Run 73 (13:36:10 – 13:37:30) – Run 74 (43:12 – 44:21) Binned distributions with the same Vernier scan location No Z vertex cuts Cut on Vr < 2

14 UC Davis June 16-21 st 2008 14 Rosi Reed Gaussian Multiplication Beam is gaussian in shape Distribution of collisions in xy space is equal to the beam distributions multiplied by each other – Also gaussian in shape

15 UC Davis June 16-21 st 2008 15 Rosi Reed Assuming the beams have the same width

16 UC Davis June 16-21 st 2008 16 Rosi Reed Beam profile vs time Summary Calculated from Vx vs Vy distributions # Beam- Beam Events Blue = Run 72, Yellow Run 73, Grey Run 74

17 UC Davis June 16-21 st 2008 17 Rosi Reed Beam Sigmas calculated from formula on pg 15 Sigma X = 1.75 mm +/-.20 Sigma Y = 2.40 mm +/-.15 Error bars reflect statistical error only If our assumptions are correct, these distributions should be flat Beam Sigmas

18 UC Davis June 16-21 st 2008 18 Rosi Reed Vernier Scan Versus Average Event Location Slope should be +/- 0.5 if our assumptions were correct

19 UC Davis June 16-21 st 2008 19 Rosi Reed Time Decay for Run 97 Empty events fall off exponentially Beam-Beam and Empty Events have the same time constant Beam-Pipe events have twice the time constant of Beam-Beam and Empty Events Run 97 occurred after BBC threshold was lowered

20 UC Davis June 16-21 st 2008 20 Rosi Reed Events During Vernier Scan During Vernier Scan it appears the empty event rate follows the beam-beam event rate in runs 72 and 73.

21 UC Davis June 16-21 st 2008 21 Rosi Reed Conclusion We still do not understand why we triggered – Empty events BBC threshold changed but the trigger rate still seems to be beam related – Beam-Pipe Events Beam Pipe events are a combination of Au-Pipe Material and Alpha-Pipe Material We have a reasonable estimate of the good event rate

22 UC Davis June 16-21 st 2008 22 Rosi Reed Backup Slides

23 UC Davis June 16-21 st 2008 23 Rosi Reed Vernier Scan

24 UC Davis June 16-21 st 2008 24 Rosi Reed Vx Vy Distribution of 1 st Primary Vertex at 9 GeV 24

25 UC Davis June 16-21 st 2008 25 Rosi Reed Z Axis distributions Thin Be beam pipe extends from Z = -75 cm to 75 cm. Outside 75 cm there is a thicker Al beam pipe. 3.6 AGeV Au+Be 3.6 AGev Au+Al

26 UC Davis June 16-21 st 2008 26 Rosi Reed Number of Vertices per Event 26 78.9% of events had 1 primary vertex – 81.6% of “beam-beam” events have 1 primary vertex – 71.6% of “beam-pipe” events have 1 primary vertex (Data taken from runs 97,76,72)

27 UC Davis June 16-21 st 2008 27 Rosi Reed XY Location of 2 nd + 3 rd Vertices for Events with Vertex 1 r > 2 cm Data from Runs 97, 76, 72 Only 8 % of secondary vertices and 8 % of teritary vertices of events labeled as beam pipe events are located in the center Indicates that most events labeled as beam pipe events are not Au- Au events that have kicked off an energetic particle.

28 UC Davis June 16-21 st 2008 28 Rosi Reed Average Eta by Event 28 Run 97, 76, 72 Eta averaged over primary tracks only

29 UC Davis June 16-21 st 2008 29 Rosi Reed Vx vs Vy Distributions for Same Vernier Scan Locations

30 UC Davis June 16-21 st 2008 30 Rosi Reed Vx vs Vy Distributions for Same Vernier Scan Locations

31 UC Davis June 16-21 st 2008 31 Rosi Reed Track Eta Distribution for Eta Ave > 0

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