Upsilon Analysis in p+p 2009

Upsilon cross-section in p+p collisions at sqrt(sNN) = 200 GeV, 2009 data.

PAs: Kurt Hill, Andrew Peterson, Gregory Wimsatt, Anthony Kesich, Rosi Reed, Manuel Calderon de la Barca Sanchez.

  • Dataset QA (Andrew Peterson)
    • Trigger ID, runs
    • Run by Run QA
    • Integrated Luminosity estimate
    • Systematic Uncertainty
  • Acceptance (Kurt Hill)
    • Raw pT, y distribution of Upsilon
    • Accepted pT, y distribution of Upsilons
    • Acceptance
    • Raw pT, eta distribution of e+,e- daughters
    • Accepted pT, eta distribution of e+,e- daughters
    • Comparison plots between single-electron embedding, Upsilon embedding
  • L0 Trigger
    • DSM-ADC Distribution (data, i.e. mainly background) (Drew)
    • DSM-ADC Distribution (Embedding) For accepted Upsilons, before and after L0 trigger selection
    • Systematic Uncertainty (Estimate of possible calibration and resolution systematic offsets).
    • "highest electron/positron Et" distribution from embedding (Accepted Upsilons, before and after L0 trigger selection)
  • L2 Trigger
    • E1 Cluster Et distribution (data, i.e. mainly background)
    • E1 Cluster Et distribution (embedding, L0 triggered, before and after all L2 trigger cuts)
    • L2 pair opening angle (cos theta) data (i.e.  mainly background)
    • L2 pair opening angle (cos theta) embedding. Needs map of (phi,eta)_MC to (phi,eta)_L2 from single electron embedding. Then a map from r1=(phi,eta, R_emc) to r1=(x,y,z) so that one can do cos(theta^L2) = r1.dot(r2)/(r1.mag()*r2.mag()). Plot cos theta distribution for L0 triggered events, before and after all L2 trigger cuts. (Kurt)
    • L2 pair invariant mass from data (i.e. mainly background)
    • L2 pair invariant mass from embedding. Needs simulation as for cos(theta), so that one can do m^2 = 2 * E1 * E2 * (1 - cos(theta)) where E1 and E2 are the L2 cluster energies. Plot the invariant mass distribution fro L0 triggered events, before and after all L2 trigger cuts. (Kurt)
  • PID (Greg)
    • dE/dx
      • dE/dx vs p for the Upsilon triggered data
      • nsigma_dE/dx calibration of means and sigmas
      • Cut optimization (Maximization of electron effective signal)
      • Final cuts for use in data analysis
    • E/p
      • E/p distributions for various p bins
      • Study of E calibration and resolution between data and embedding (for L0 Trigger systematic uncertainty)
      • Resolution and comparison with embedding (for cut efficiency estimation) (Kurt and Greg)
  • Yield extraction
    • Invariant mass distributions
      • Unlike-sign and Like-sign inv. mass (Drew)
      • Like-sign subtracted inv. mass (Drew)
      • Crystal-Ball shapes from embedding/simulation. (Kurt) Crystal-ball parameters to be used in fit (Drew)
    • Fit to Like-sign subtracted inv. mass, using CB, DY, b-bbar.
      • Contour plot (1sigma and 2sigma) of b-bbar cross section vs. DY cross section. (Drew)
      • Upsilon yield estimation and stat. + fit error. (Drew)
    • (2S+3S)/1S (Drew)
  • pT Spectra (Drew)
  • Cross section calculation.
    • Yield
    • Integrated luminosity
    • Efficiency (Numbers for each state, and cross-section-branching-ratio-weighted average)
    • Uncertainty
  • h+/h- Corrections

Upsilon Analysis in p+p 2009 - L0 Trigger

 

2009 BTOW Calibrations

Upsilon Analysis in p+p 2009 data - Acceptance

  • Acceptance (Kurt Hill)  -  Upsilon acceptance aproximated using a simulation that constructs Upsilons (flat in pT and y), lets them decay to e+e- pairs in the Upsilon's rest frame, and uses detector response functions generated from a single electron embedding to model detector effects.  An in depth study of this method will also be included.
    • Raw pT, y distribution of Upsilon
    • Accepted pT, y distribution of Upsilons
    • Acceptance
    • Raw pT, eta distribution of e+,e- daughters
    • Accepted pT, eta distribution of e+,e- daughters
    • Comparison plots between single-electron embedding, Upsilon embedding

Upsilon Analysis in p+p 2009 data - Acceptance

  • Acceptance (Kurt Hill)
    • Raw pT, y distribution of Upsilon
    • Accepted pT, y distribution of Upsilons
    • Acceptance
    • Raw pT, eta distribution of e+,e- daughters
    • Accepted pT, eta distribution of e+,e- daughters
    • Comparison plots between single-electron embedding, Upsilon embedding