M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, 20031 Blessing of Run II Diffractive Results Introduction Data Selection.

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Presentation transcript:

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Blessing of Run II Diffractive Results Introduction Data Selection Plots for Blessing

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Forward Physics Hard Single Diffraction Double Pomeron Exchange …

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Diffractive Dijets Compare diffractive events to ND Measure diffractive structure function from R SD/ND vs x bj Measure  pbar momentum loss fraction) from calorimeter information

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7,  Momentum Loss Fraction Diffractive events are boosted towards positive   small  Measure fractional momentum loss of anti-proton M X 2  s   =  y  ln (1/     e  ss

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Trigger RP is triggered on leading antiprotons Use RP + jet triggers require jets

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Data Sample Use dedicated diffractive triggers  RP+J5 (diffractive sample)  J5 (control sample) Data sample ~9 pb -1 (PHYSICS_1_03_v1)

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Event Selection 1.Triggered events352,359 2.MET Significance<6352,359 3.Two jets (E T >5, |  <2.5)175,292 4.RP coincidence 168,153 5.SD (0.02<  <0.1) 15,209 6.All BSC East Gap 1,126

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Question #4 Q : What is the ratio SD/ND for E T > 10 GeV ?

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, DSF with Jet E T cut E T * = E T 1 + E T 2 2

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Q 2 Dependence

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Answer to Q#4 A : Slope and normalization change by ~ 1%. Q : What is the ratio SD/ND for E T > 10 GeV ?

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Plots For Blessing Suggested modifications have been implemented

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7,  Distribution

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Rapidity Run I PRL  Diffractive dijets are boosted away from the recoil antiproton

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Mean Dijet E T

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7,  jet 1 -jet 2 )  Diffractive dijets are more back to back

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, MP Multiplicity

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Diffractive Structure Function

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Diffractive Structure Function (II)

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, East Multiplicity: BSC vs MP

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, DPE Enhanced Sample Study a dedicated DPE trigger (RP+J5+GapE) ~300 k events E T (jet 1,2 )>5 GeV |  (jet 1,2(,3) )|< 2.5 (0,0) bin  ~ 16,000 events (in Run I: 100 evts)

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7,  jet 1 -jet 2 )

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Dijet Mean Rapidity

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Jet Transverse Energy

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Conclusions Relax, it is only physics.

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Question # 1 Q : Is the BG peak at  ~ 1 due to overlap events from multiple interactions?

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7,  Distribution

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Luminosity Dependence Luminosity:1.0 E E312.3 E31

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Overlap Rate  ND (1 - e - n RP ) +  SD (1 - e - n )  SD e - n R (ND/SD) = J5 x RP overlap SD x MB overlap n RP = ( 1 mb/50 mb) x n, n = 0.3 x L[1 x E31]  ND /  SD ~ 600  R (ND/SD) = 12 n e n SD surviving MB overlap

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Multiple Interactions Shift ND Peak R vs log (1 + n )

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Run I vs Run II Run I Run II L um / bunch 0.16E30 / E30 / 36  ND /  SD 300 (lower jet E T ) 600 R (Run I/Run II ) = 1/60 R (Run II) = 10  R (Run I) = 0.15

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Multiple Interactions

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Answer to Q# 1 A : Yes. 1.Ratio is consistent with Run I numbers and Run II expectations. 2.Peak at  ~ 1 shifts according to luminosity, as expected. Q : Is the BG peak at  ~ 1 due to overlap events from multiple interactions?

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Question #2 Q : What is the effect of the MP energy scale calibration ?

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, MP Calibration Use slope from ADC distribution Tower-to-tower relative calibration with data/MC Energy scale from MC MC/MBR Pile-up at high luminosity (Slope-Fit)/Fit ~7% for each  ring Time dependence (LED)

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, MP Multiplicity

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, MP Contribution to  ND

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Effect of MP Energy Scale  E = +/- 25%    log  = +/- 0.1

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Answer to Q#2 A : An energy scale variation of +/- 25% yields  log  = +/  log  =0.1 is the bin width of our  distribution. 2.Peak position in data is centered where expected, indicating the energy scale uncertainty is < 25%. Q : What is the effect of the MP energy scale calibration ?

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Question #3 Q : What is the background in the RP inclusive rate ?

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, RP Inclusive Data

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Zero Crossings

M. Gallinaro, `` RunII Diffractive Results: Blessing'' - QCD meeting, March 7, Answer to Q#3 Q : What is the background in the RP inclusive rate ? A : It is 1-2% of all RP triggers, concentrated at log  < - 3