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Study of anti-quark flavor asymmetric via E906

Study of anti-quark flavor asymmetric via E906. Shiuan-Hal Shiu 2009/7/13. Contents. Introduction Hardware operation Fast Monte Carlo simulation Future work. Introduction. Is in the proton?. ?. Proton is composed of three valence quark,gluons and sea

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Study of anti-quark flavor asymmetric via E906

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  1. Study of anti-quark flavor asymmetric via E906 Shiuan-Hal Shiu 2009/7/13

  2. Contents • Introduction • Hardware operation • Fast Monte Carlo simulation • Future work

  3. Introduction

  4. Is in the proton? ? • Proton is composed of three valence quark,gluons and sea • By contrast with other quarks, the up and down quark are very similar. • Because of the similarity, anti-down and anti-up quark distributions in the proton are assumed to be equal. • Is this true……? =

  5. Light Antiquark Flavor Asymmetry: Brief History • Naïve Assumption: Flavor symmetry This is a common assumption until 1991 X

  6. Light Antiquark Flavor Asymmetry: Brief History • Naïve Assumption: • Gottfried Sum Rule: New Muon Collaboration (NMC) , Phys. Rev. D50 (1994) R1 SG = 0.235 ± 0.026 ( Significantly lower than 1/3 ! )

  7. Light Antiquark Flavor Asymmetry: Brief History • Naïve Assumption: • Gottfried Sum Rule: • NA51 (Drell-Yan) NA 51 Drell-Yan confirms d-bar(x) > u-bar(x) l hA q * q hB l

  8. Light Antiquark Flavor Asymmetry: Brief History • Naïve Assumption: • Gottfried Sum Rule: • NA51 (Drell-Yan) • E866/NuSea (Drell-Yan)

  9. xtarget xbeam E866 Experiment • The cross section of Drell-Yan process is • Here q1, q2 are the beam, target quark distribution. • Detector acceptance chooses xtarget and xbeam. u Xtarget u d d Xbeam

  10. E866 Experiment E866 use hydrogen and deuterium target Ring-Imaging Cherenkov Counter Station1 Muon Detectors Cryogenic Target System Hadronic Calorimeter Station2 Hadron absorber Station3 ElectromagneticCalorimeter SM12 Analyzing Magnet SM3 Analyzing Magnet

  11. E866 Experiment

  12. Main Injector 120 GeV Tevatron 800 GeV Advantages of 120 GeV Main Injector The future: Fermilab E906 • Data in 2009 • 1H, 2H, and nuclear targets • 120 GeV proton Beam The past: Fermilab E866/NuSea • Data in 1996-1997 • 1H, 2H, and nuclear targets • 800 GeV proton beam Fixed Target Beam lines

  13. Follow basic design of MEast spectrometer : • Where possible and practical, reuse elements of the E866 spectrometer. • Tracking chamber electronics • Hadron absorber, beam dump, muon ID walls • Station 2 and 3 tracking chambers • Hodoscope array PMT’s • SM3 Magnet E866 Meson East Spectrometer • New Elements • 1st magnet (different boost) • Sta. 1 tracking (rates) • Scintillator (age) • Trigger (flexibility)

  14. E906 Spectrometer: Bend Plane View Station 2 & 3 Drift Chambers 1700 Channels Multi-hit TDC’s M2 Sta.1 M1 Target Sta.3 Sta.2 Sta.4 Muon ID wall MWPC 5500 Channels 256 Hodoscopes Station 4 Prop Tubes 400 Channels

  15. Measurements with the Drell-Yan process • Fermilab E906/Drell-Yan will extend these measurements and reduce statistical uncertainty. • E906 expects systematic uncertainty to remain at approx. 1% in cross section ratio.

  16. HARDWARE OPERATION

  17. What is CODA? • CODA (CEBAF Online Data Acquisition) is a software DAQ system. Translate Typical system chart RUN control GUI cMlogDataBase mSQLDataBase VME RC platform Log message ROC msqld cMsg Single board computer EB ET ER Disk ROC Network Ethernet User proc. VME COMPUTER

  18. The CODA control panel GUI RCPlatform EBe906 ERe906 MSQL Daemon Event Transfer system

  19. Conceptual design of DAQ based on CODA MWPC, HODO, Muon Coincidence Register System, VME CAMAC TDC for DC Interface to VME Accelerator scalers, VME? ROC3 ROC2 ROC1 L2 Trigger Electronics House Ethernet Hub Unix host running CODA Counting House Data Decoder Software Data Storage Online monitoring

  20. CODA tools ROCe906 roc1 Ebe906 daq2 ERe906 daq2 CODA file

  21. CODA tools • Dbedit: can edit the information of database

  22. CODA tools • Xcefdmp: event monitoring software. View File mode Offline monitoring Spy Event mode Online monitoring

  23. Installation of CODA • 1. Setup a user account with the proper environment. • 2. Setup the CODA database. • 3. Setup MVME6100. • 4. Transfer the ROC to a DAQ crate by downloading the KERNAL and CODA_ROC program on MVME6100. • 5. Add a trigger supervisor. • 6. Add more VME module.

  24. Hardware configuration in IPAS MVME6100 Single board computer SIS3610 Trigger supervisor SIS3600 Multi events Latch

  25. Trigger supervisor and latch module SIS3600 • Latch module(SIS3600): • When this module received a trigger, it will capture the signal pattern from the input channel • Will not send any interrupt to single board computer • Trigger supervisor(SIS3610): • When this module were triggered it will send an interrupt to single board computer CONTROL I/O 32 Data Channl

  26. Use .crl file to control CODA • Most of the components in a CODA system are pre-defined by CODA and only require configuring • We can easily write CRL code to control CODA. Create Booted Configure Configured Configure download Terminate Download Prestart Pause Paused Actived GO End Terminated

  27. Control the SIS3600 • Functions of SIS3610 is well supported in CODA, but SIS3600 is not. • In order to control the SIS3600 we need to write the driver which compatible with CODA. • I consult the driver of SIS3610 and the manual of SIS3600 to write a driver for SIS3600. • By checking the input pattern, the SIS3600 can work correctly. … 0001 1000 … … 1000

  28. FAST MONTE CARLO Simulation

  29. About the fast monte carlo simulation • Base on Fortran language. • Modified version of E866/E772 “fast” Monte Carlo Code to include E906 geometry. • Only traces dimuon from Drell-Yan events, and the decays of J/. • Have 2 main parts • Muon pair creation • Detector • Magnetic field is simplified, but muon energy loss and multiple scattering are included.

  30. We want to observe events of low mass Original Want acceptance acceptance Mass (GeV) Mass (GeV)

  31. The mass and the magnet current M1 M2

  32. The mass and the magnet current M1 M2

  33. The mass and the magnet current M1 M2

  34. The mass and the magnet current M1 M2

  35. Configure M1 and M2 Configuration file M2 M1

  36. How to obtain the acceptance • The top diagram is the mass distribution of generated dimuon pairs. • The middle diagram is the mass distribution of reconstructed dimuon pairs. • The bottom diagram “Acceptance” as a function of dimuon mass. Counts Thrown GeV Counts Reconstruction GeV Gev Acceptance Acceptance GeV

  37. The result of varying M1 current • The mass region of generated dimuon pairs is from 1Gev to 15Gev • Green line is the acceptance value with the original M1 current setting. • By increasing the current we find that the peak of acceptance is shifting to high mass end. • Reducing the M1 current can increase the acceptance in the low-mass region. M1x0.1 M1x1.5 Acceptance M1x0.5 M1x2.0 M1x1.0 GeV

  38. FIX M1*1.5 varying M2 Reconstruction Reconstruction Reconstruction Counts Acceptance M2x1.5 M2x1.0 M2x0.5 Counts Thrown Thrown Thrown Acceptance Acceptance Acceptance Acceptance GeV GeV GeV GeV M2*1.5 M2*1 M2*0.5

  39. FIX M1*1 varying M2 Reconstruction Reconstruction Reconstruction Counts Acceptance M2x1.5 M2x1.0 M2x0.5 Counts Thrown Thrown Thrown Acceptance Acceptance Acceptance Acceptance GeV GeV GeV GeV M2*1.5 M2*1 M2*0.5

  40. FIX M1*0.1 varying M2 Reconstruction Reconstruction Reconstruction Counts Acceptance M2x1.5 M2x1.0 M2x0.5 Counts Thrown Thrown Thrown Acceptance Acceptance Acceptance Acceptance GeV GeV GeV M2*1.5 M2*1 M2*0.5 GeV

  41. Conclusion • Reducing the M1 current can increase the acceptance of low mass region dimuons. • Adjusting the M2 current does not change the acceptance region significantly. • Howerer, adjusting M2 current can change the acceptance.

  42. Dump/Target separation M1x1 Thrown • Software cuts conditions • Purple:all events • Green: xF>0 and • M>4.5 GeV • and pz>20 GeV • Blue: Green and • |ytrack|>2.25 in at z=0 (zdump) • Red: Blue and • |ytrack|<10.0 in at z=-60 (zstart) Counts Reconstruction Counts Z Target Dump

  43. Dump/Target separation Mass cut > 4.5 M1x0.5 M1x0.1 Thrown Thrown Counts Counts Reconstruction Reconstruction Counts Counts Z Z

  44. Dump/Target separation Mass cut < 4.5 M1x0.5 M1x0.1 Thrown Thrown Counts Counts Reconstruction Reconstruction Counts Counts Z Z

  45. Dump/Target separation Mass cut < 4.5 M1x0.5 Green + Y(zdump)>2.25 No cut Counts Counts Counts Counts 1 3 1 3 Z Z Z Z Blue + Y(zstart)>10 Counts Counts Counts Counts Xf>0 Retrace M<4.5 Pz>10 2 Z Z 2 4 4 Z Z

  46. Dump/Target separation Mass cut < 4.5 M1x0.1 Green + Y(zdump)>2.25 Counts Counts No cut 1 3 Z Z Blue + Y(zstart)>10 Counts Xf>0 Retrace M<4.5 Pz>10 Counts 2 Z 4 Z Reducing the M1 current will lead the z resolution worse.

  47. Change the target location 50 inches

  48. Change the target location 130 inches

  49. Change the target location Mass cut < 4.5 M1*0.5 Green + Y(zdump)>2.25 No cut Counts Counts 3 1 Z 1 3 Z Xf>0 Retrace M<4.5 Pz>10 Blue + Y(zstart)>10 Counts Counts 2 Z 2 4 4 Z

  50. Change the target location Mass cut < 4.5 M1*0.1 Green + Y(zdump)>2.25 Counts Counts No cut 3 1 Z 1 3 Z Blue + Y(zstart)>10 Counts Counts Xf>0 Retrace M<4.5 Pz>10 2 2 Z 4 4 Z Changing target location can slightly improve the z resolution.

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