8/7/2015 1/29 Michael Meier, Purdue University

Upsilon Cross Section

Michael Meier, Matthew Jones

Purdue University

CDF Collaboration

August 7, 2015

8/7/2015 2/29 Michael Meier, Purdue University

Upsilon Cross Section

• NΥ(nS) is the Υ(nS) signal yield in the fitted peak

• A is the geometric detector acceptance depending on valid region of detector

• ε is the reconstruction efficiency with selection cuts for fiducial muons

• ∫ L dt is the integrated luminosity

ypdtLA

NnSBr

dydp

d

T

nS

T

)(2

))((

8/7/2015 3/29 Michael Meier, Purdue University

Acceptance • Measured with Monte Carlo in bins of pT and run

period ▪ Function of time because of dead wires,

chambers, etc.

• Ratio of Number accepted to Total Number Generated

• Number Accepted – CMUP-CMU or CMUP-CMX ▪ Rapidity |y| < 0.6 ▪ Decay vertex |z| < 60 cm ▪ One muon fiducial in CMU and CMP with pT > 4 ▪ One muon fiducial in CMU or CMX with pT > 3 ▪ Valid region of detector – depends on CMU, CMP, CMX

• Total Number Generated ▪ Rapidity |y| < 0.6

Gen Total

Accepted

N

NA

8/7/2015 4/29 Michael Meier, Purdue University

Valid Detector Regions

• CMU

▪ Veto 1/3 of 8W and east end of 6E

• CMP

▪ Remove dead wires as a function of run number

• CMX

▪ Skip wedges 15 and 20

▪ Hole for soleniod cryo (side 1, wedges 5 and 6)

▪ Miniskirts (wedges 15 to 20) missing before Run 227704

▪ Keystone wedges (side 0, wedges 5 and 6) missing before Run 233112

▪ Small hole on the west (side 0, wedge 14) between Run 190695 and Run 210009

8/7/2015 5/29 Michael Meier, Purdue University

Upsilon Trigger • UPSILON_CMUP_CMU(_DPS)

▪ L1_TWO_CMU1.5_LUMI_280 » 2 muon stubs in CMU with pt > 1.5 GeV/c » 2 XFT tracks with pt > 1.52 GeV/c

▪ L2_CMUP1.5_PT3_CMU1.5_PT1.5DPS » 1 CMUP muon with pt > 3.04 GeV/c » 1 CMU muon with pt > 1.52 GeV/c

▪ L3_UPSILON_CMUP3_CMU1.5 » 1 CMUP muon with pt > 3.0 GeV/c, Δx(CMU) 1.5 GeV/c » 1 XFT track with pt > 1.52 GeV/c, 1 XFT track with pt > 2.04 GeV/c, signal in CSX

▪ L2_CMUP1.5_PT3_CSX1.5_PT2_CSX_DPS » 1 CMUP muon with pt > 3.04 GeV/c » 1 CMX muon with pt > 2.04 GeV/c

▪ L3_UPSILON_CMUP3_CMX2 » 1 CMUP muon with pt > 3.0 GeV/c, Δx(CMU)

8/7/2015 6/29 Michael Meier, Purdue University

Selection Cuts • Muon cuts

▪ CDF Muon Object, |Δz0(mu1,mu2)| < 5.0 cm, opposite charge (mu1,mu2), Δphi(mu1,mu2) > 2.25 degrees, |z0| < 60.0 cm

• CMUP–CMU ▪ CMUP muon matched to XFT track

pT > 4.05 GeV, Δx(CMU)

8/7/2015 7/29 Michael Meier, Purdue University

Efficiency

• Efficiency is measured with the Muon+SVT sample (jbmu)

• B_SEMI_CMUP4_TRACK2_D120 ▪ L1_CMUP6_PT4_NCLC64

» 1 muon stub in CMU with pt > 6.0 GeV/c

» 1 XFT track with pt > 4.09 GeV/c

▪ L2_CMUP6_PT4_D0_&_TRK2_D120_DPHI90_DPS » 1 XFT track with pt > 4.09 GeV/c and 1 CMUP muon

» 1 SVT track with pt > 2 GeV/c, SVT chi2

8/7/2015 8/29 Michael Meier, Purdue University

Trigger Efficiency • JPsi candidates from all tracks in Muon+SVT sample

▪ |Δz0(mu1,mu2)| < 5.0 cm, opposite charge (mu1,mu2), Δphi(mu1,mu2) > 2.25 degrees

▪ Both tracks |z0| < 60.0 cm, XFT matched, XFT fiducial

• Require 1 CMUP muon with pt > 4.0 GeV/c, has CMUP L1 trigger, is fiducial in CMUP ▪ If both muon candidates pass these cuts, then consider the one with higher

pt as the CMUP muon

• Require other track to be fiducial in CMU, pass CMU acceptance (be in a valid region of detector), and have pt > 3.0 GeV/c ▪ Check for hits in CMU (CdfMuon) and Δx(CMU)

8/7/2015 9/29 Michael Meier, Purdue University

CMU Efficiency

• Required ▪ fiducial in CMU ▪ pass CMU

acceptance ▪ pt > 3.0 GeV/c

• Passed Cuts ▪ has CMU hits

(CDFMuon object) ▪ Δx(CMU)

8/7/2015 10/29 Michael Meier, Purdue University

CMUP Efficiency • Required

▪ fiducial in CMU & CMP

▪ pass CMU and CMP acceptance

▪ pt > 3.0 GeV/c

• Passed Cuts ▪ has CMUP hits

(CDFMuon object) ▪ Δx(CMU)

8/7/2015 11/29 Michael Meier, Purdue University

CMX Efficiency • Required

▪ fiducial in CMX ▪ pass CMX

acceptance ▪ pt > 3.0 GeV/c

• Passed Cuts ▪ has CMX hits

(CDFMuon object) ▪ Δx(CMX)

8/7/2015 12/29 Michael Meier, Purdue University

Trigger Efficiency Plots

• Trigger Efficiency is CMUP efficiency times CMU(CMX) efficiency

• CMUP-CMU (top plot)

• CMUP-CMX (bottom plot)

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XFT Efficiency and Vertex Efficiency

• XFT Efficiency

▪ Measured using unbiased sample tracks from the kaon in B± → J/ψ K± decays reconstructed with jpmm dataset

• Vertex Efficiency

▪ Measured using minimum bias events up to run 203799

• Not yet included in cross section calculations!

0039.09648.0XFT

0035.09550.0 vertex

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• Previous measurement with 29 run periods instead of 28 ▪ first 5 run periods cover different run numbers

• Measured using JPSI_CMUP4_CMU_L2_DPS and JPSI_CMUP4_CMX_L2_DPS ▪ Requires 4 GeV/c CMUP muon in Level 2 and JPsi in Level 3

• Require unbiased leg to be CMUP and pt > 4.0 GeV/c • Satisfies Level 2 if has

XFT track and muon stub in CMU or CMX within range of cells from CMU or CMX look-up tables

• Efficiency calculated from yield of JPsi passing and failing Level 2 requirements

Level 2 Efficiency (Previous Measurement)

CMU+CMU (black) CMU+CMX (red)

Not yet included in cross section calculations!

8/7/2015 15/29 Michael Meier, Purdue University

Upsilon Sample

• Upsilon candidates in jbmm data sample ▪ |Δz0(mu1,mu2)| < 5.0 cm, opposite charge (mu1,mu2),

Δphi(mu1,mu2) > 2.25 degrees ▪ Both muons |z0| < 60.0 cm, XFT matched, XFT fiducial ▪ One muon with pt>4.05 GeV/c, other muon with pt>3.05 GeV/c

• CMUP-CMU ▪ CMUP muon with pt > 4.0 GeV/c, fiducial in CMUP, pass CMU

and CMP acceptance, Δx(CMU)

8/7/2015 16/29 Michael Meier, Purdue University

Upsilon Mass Plots • Plots of upsilon mass in

bins of pt and run period for CMUP-CMU and CMUP-CMX

• Yields found in each bin of pt and run period

• 28 run periods • 8 pt bins

▪ 0 to 2 GeV/c ▪ 2 to 4 GeV/c ▪ 4 to 6 GeV/c ▪ 6 to 8 GeV/c ▪ 8 to 12 GeV/c ▪ 12 to 17 GeV/c ▪ 17 to 23 GeV/c ▪ 23 to 40 GeV/c

CMUP-CMU Run Period 10

0 < pt < 2 GeV/c

CMUP-CMU Run Period 10

2 < pt < 4 GeV/c

8/7/2015 17/29 Michael Meier, Purdue University

Calculations • Cross Section as a function of run period

▪ Sum yield over acceptance for all pt bins

▪ Divide by luminosity in that run period

• Cross Section as function of pt bin ▪ Sum yield over acceptance and efficiency for all run

periods

▪ Divide by total luminosity in all run periods

binspt periodrun bin,pt

periodrun bin,pt

periodrun periodrun

1)periodrun (

A

N

yL

periodrun periodrun periodrun bin,pt

periodrun bin,pt

total

1)binpt (

A

N

pyL T

8/7/2015 18/29 Michael Meier, Purdue University

Upsilon “Cross Section” (run period)

• Yield/lum for each run period (for all pt bins)

8/7/2015 19/29 Michael Meier, Purdue University

Upsilon “Cross Section” (run period)

• Shows time dependence for cross section

Average: 55.38 ± 0.13 χ2 = 1146.27 χ2 = 171.34

Average: 30.37 ± 0.09 χ2 = 830.65 χ2 = 498.90

8/7/2015 20/29 Michael Meier, Purdue University

Upsilon Cross Section (run period) • Yield/(lum*eff*acc) for each run period (sum over all pt bins)

8/7/2015 21/29 Michael Meier, Purdue University

Upsilon Cross Section (run period)

• Reduced time dependence for CMUP-CMU

Average: 638.43 ± 4.2 χ2 = 107.48 χ2 = 55.71

8/7/2015 22/29 Michael Meier, Purdue University

Upsilon Cross Section (run period)

• CMUP-CMX time dependence needs more analysis

Average: 697.56 ± 7.0 χ2 = 97.42 χ2 = 59.17

8/7/2015 23/29 Michael Meier, Purdue University

Previous Measurements

• Current Work for |y|< 0.6

▪ CMUP-CMU = 638.43 ± 4.2 pb

▪ CMUP-CMX = 697.56 ± 7.0 pb

• D0 Run II (1.96 TeV) for |y|< 0.6

▪ PRL 94, 232001 (2005): 732 ± 19(stat) ± 73(syst) ± 48 (lumi) pb

▪ PRL 100, 049902 (2008): 628 ± 16(stat) ± 63(syst) ± 38 (lumi) pb

• CDF Run I (1.8 TeV) for |y| < 0.4

▪ PRL 88, 161802 (2002): 680 ± 15(stat) ± 18(syst) ± 26 (lumi) pb

▪ PRL 75, 4358 (1995): 753 ± 29(stat) ± 72(syst) pb

8/7/2015 24/29 Michael Meier, Purdue University

Upsilon Cross Section (pt) – No Level 2 Eff • Yield/(lum*eff*acc*Δy*Δpt) for each pt bin (for all run periods)

8/7/2015 25/29 Michael Meier, Purdue University

Upsilon Cross Section (pt) – No Level 2 Eff • Log scale for Yield/(lum*eff*acc*Δy*Δpt)

8/7/2015 26/29 Michael Meier, Purdue University

Future Work

• Reduced time dependence for CMUP_CMU

• CMUP_CMX still shows slight time dependence

▪ Look into CMX muons and phi dependence

• Include Level 2 efficiency

▪ Not yet included in cross section calculations!

CMU+CMU (black) CMU+CMX (red)

Level 2 Efficiency

8/7/2015 27/29 Michael Meier, Purdue University

Backup Slides

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CMP Dead Wires • JPsi signal reconstructed in the Muon+SVT sample (jbmu) • Monte Carlo sample of muons used to map occupancy of CMP

chambers ▪ CMP occupancy depends on chamber number, due to different

material in front of the various regions of the detector

• Assume ratio of number of counts in a given CMP chamber to total number of counts in the CMP system is the same in data and Monte Carlo

• Expected number of counts (Nexpected) in a CMP chamber (i) in a run given by:

• Must have 100 counts (mu) in a CMP chamber ▪ Runs are combined to have the expected number of counts in a

chamber

• Measure the actual number counts (Nactual) in the same set of runs

• Compute the Poisson probability to count Nactual given Nexpected • Consider the CMP chamber (wire) dead for probability < 1%

totalData

totalMC

iMC

,i NN

NN ,

,

,

expected

8/7/2015 29/29 Michael Meier, Purdue University

Plot of CMP Dead Wires

• Dead CMP wire number vs Run Index (run number) • Only bins with probability < 1% are filled