1 / 37

Feasibility Study of Pion-induced DY Process in FNAL E906

Santa Fe Polarized Drell -Yan Physics Workshop. Feasibility Study of Pion-induced DY Process in FNAL E906. Wen-Chen Chang (Institute of Physics, Academia Sinica) & Jen-Chieh Peng (UIUC) 11/1/2010. Competition and complementarity. DY acceptance @ COMPASS.

jory
Télécharger la présentation

Feasibility Study of Pion-induced DY Process in FNAL E906

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Santa Fe Polarized Drell-Yan Physics Workshop Feasibility Study of Pion-induced DY Process in FNAL E906 Wen-Chen Chang (Institute of Physics, Academia Sinica) & Jen-Chieh Peng (UIUC) 11/1/2010

  2. Competition and complementarity Oleg Denisov

  3. DY acceptance @ COMPASS Sivers Function prediction (M.Anselmino et al) COMPASS Acceptance Prediction for Sivers function as a function of x, COMPASS acceptance in xp and acceptance coverage xπ.vs.xp Oleg Denisov

  4. DY@COMPASS projections I Oleg Denisov

  5. (Dutta, JCP, Cloet, Gaskell, arXiv:1007.3916) W+, W- production in P+A collision is also sensitive to flavor-dependent EMC

  6. Azimuthal cos2Φ Distribution in p+p and p+d Drell-Yan E866 Collab., Lingyan Zhu et al., PRL 99 (2007) 082301; PRL 102 (2009) 182001 Smallνis observed for p+d D-Y Boer-Mulders function h1┴: ν(π-Wµ+µ-X)~ [valence h1┴(π)] * [valence h1┴(p)] ν(pdµ+µ-X)~ [valence h1┴(p)] * [sea h1┴(p)] Sea-quark BM functions are much smaller than valence quarks 6

  7. Advantages of 120 GeV Main Injector The future: Fermilab E906 • Data taking planned in 2010 • 1H, 2H, and nuclear targets • 120 GeV proton Beam The (very successful) past: Fermilab E866/NuSea • Data in 1996-1997 • 1H, 2H, and nuclear targets • 800 GeV proton beam • Cross section scales as 1/s • 7x that of 800 GeV beam • Backgrounds, primarily from J/ decays scale as s • 7x Luminosity for same detector rate as 800 GeV beam • 50x statistics!! Fixed Target Beam lines Tevatron 800 GeV Main Injector 120 GeV

  8. 4.9m Station 2 and 3: Hodoscope array Drift Chamber tracking E906 Spectrometer Hadron Absorber Station 1: Hodoscope array MWPC tracking Solid Iron Focusing Magnet, Hadron absorber and beam dump Solid iron magnet • Reuse SM3 magnet coils • Sufficient Field with reasonable coils • Beam dumped within magnet Mom. Meas. (KTeV Magnet) Station 4: Hodoscope array Prop tube tracking 25m • Experimental Challenge: • Higher probability of muonic decay for the produced hadrons. • Larger multiple scattering for the muon traveling through hadron absorber and solid magnet. • Worse duty factor for beam structure. • Higher singles rates. Liquid H2, d2, and solid targets

  9. Extracting d-bar/-ubar From Drell-Yan Scattering Ratio of Drell-Yan cross sections (in leading order—E866 data analysis confirmed in NLO) • Global NLO PDF fits which include E866 cross section ratios agree with E866 results • 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. Acceptance sitting at large x_beam due to the small beam energy.

  10. Extracting d-bar/-ubar From Drell-Yan Scattering Ratio of Drell-Yan cross sections (in leading order—E866 data analysis confirmed in NLO) • Global NLO PDF fits which include E866 cross section ratios agree with E866 results • 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.

  11. Fermilab Test Beam Facilityhttp://www-ppd.fnal.gov/FTBF/ E906

  12. Outline of Feasibility Study • Momentum profile of secondary beams from 120-GeV primary proton hitting 400mm Be target. Proton flux is assumed to be 1*1012 /per spill. • Drell-Yan cross sections from  beam interacting with LH2 target. • E906 acceptance evaluated by E906 FastMC. • Final yield (= # of beam * # of target/area * DY cross section * E906 Acceptance) as a function of beam momentum for  beam. • Repeat the study for the case of 980-GeV proton beam. • Summary table.

  13. Momentum Distribution of Secondary Beam • Primary beam: 120-GeV proton. • Flux: 1*1012/spill. • Target: 400mm Be. • Acceptance: 2 mrad angular acceptance (0.25-2.0). • Momentum bite: 1%. • Use “malensek.f” coded by Chuck Brown. • Reference: Malensek parameterization (http://ppd.fnal.gov/experiments/e907/notes/MIPPnotes/public/pdf/MIPP0008/MIPP0008.pdf)

  14. Secondary pion+ and pion- beam

  15. Secondary K+ and K- beam

  16. Secondary proton and antiproton beam

  17. Positive- and Negative-charged Secondary Beam (120 GeV) Significant contamination from protons.

  18. Positive- and Negative-charged Secondary Beam (150 GeV)

  19. DY Cross Section, Target and Acceptance • DY cross section is calculated utilizing the proton and pion PDF functions in the CENRLIB “pdflib”. A cut on M>1.0 GeV/c2 is imposed. • 20-inches long LH2 target. • Three configurations of the focusing magnet (FMAG): • I=1000: Low dimuon-mass • I=2000: Intermediate dimuon-mass • I=2750: Large dimuon-mass

  20. Comparison Between Data and Leading-Order Calculation EXPeriment = FNAL-444 REaction = pi- Nucleus --> mu+ mu- X Plab = 225 GeV Author = Anderson et al. Reference = Phys. Rev. Lett. 42 (1979) 944 Target = C http://durpdg.dur.ac.uk/cgi-hepdata/drell1/pi-_N_mu/fnal_444/latest_2

  21. Comparison Between Data and Leading-Order Calculation EXPeriment = FNAL-615 REaction = pi- Nucleus --> mu+ mu- X Plab = 252 GeV Author = Conway et al. Reference = Phys. Rev. D39 (1989) 92 Target = W http://durpdg.dur.ac.uk/cgi-hepdata/drell1/pi-_N_mu/fnal_615/latest

  22. Cross Section (nb) of +p Drell-Yan in [M,xf] as a function of Pbeam P=20 GeV P=30 GeV P=10 GeV P=40 GeV P=50 GeV P=60 GeV P=70 GeV P=80 GeV P=90 GeV

  23. Flux of  Beam Per Spill

  24. Acceptance of +p Drell-Yanin [M,xf] as a function of Pbeam(I=2000) P=20 GeV P=30 GeV P=10 GeV P=40 GeV P=50 GeV P=60 GeV P=70 GeV P=80 GeV P=90 GeV

  25. Final Yield of +p Drell-Yanin [M,xf] as a function of Pbeam(I=2000) P=20 GeV P=30 GeV P=10 GeV P=40 GeV P=50 GeV P=60 GeV P=70 GeV P=80 GeV P=90 GeV

  26. Final Yield of +p Drell-Yanas a function of Pbeam (I=2000) From [M,xf]

  27. Accepted +p Drell-Yan Eventsat Pbeam =80 GeV (I=2000) Mass coverage of 4-6 GeV/c2.

  28. Accepted +p Drell-Yan Eventsat Pbeam =80 GeV (I=2000) Good coverage of large x_pion.

  29. Positive- and Negative-charged Secondary Beam (980 GeV)

  30. Final Yield of +p Drell-Yanin [M,xf] as a function of Pbeam(I=2000) P=150 GeV P=200 GeV P=100 GeV P=250 GeV P=300 GeV P=350 GeV P=400 GeV P=450 GeV P=500 GeV

  31. Final Yield of -+p Drell-Yanas a function of Pbeam (I=2000) From [M,xf]

  32. Accepted -+p Drell-Yan Eventsat Pbeam =350 GeV (I=2000) Bad coverage of large mass region.

  33. Accepted -+p Drell-Yan Eventsat Pbeam =350 GeV (I=2000)

  34. Summary Table *:at a rate of 1*10^12 protons per spill, 60 spills per hour, 100 hours per week, and 26 weeks of running per year. This yields an integrated proton intensity of 1.6*10^17 protons per year. (FERMILAB-TM-2108)

  35. Measurement of Low-Mass Pion-induced Drell-Yan(1.8<M<2.6 GeV/c2) Low pion beam intensity  Less hadron absorber  Better mass resolution

  36. Accepted +p Drell-Yan Eventsat Pbeam =80 GeV (I=I000) An enhancement of yield x30, compared to that of I=2000.

  37. Summary • A extremely small yield of pion-induced DY measurement (~1/per year) at intermediate-mass region is estimated under the current beam and detector configuration for FNAL E906. • Possible ways for increasing the production rate: • Increase of beam intensity: x10 • Increase of momentum bite: x5 (1%  5%) • Increase of target length: x2 • Usage of NH3 target: x5 • Optimization of detection acceptance: x2 • Measurement of low-mass DY events with good mass resolution is possible.

More Related