Status of  b Scan Jianchun Wang Syracuse University Representing L b scanners CLEO Meeting 05/11/02.

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Presentation transcript:

Status of  b Scan Jianchun Wang Syracuse University Representing L b scanners CLEO Meeting 05/11/02

Jianchun (JC) Wang2 Introduction  Goal: Scan the region around  b  b threshold to find largest cross-section of  b  b pair production.  Tools for the scan:  Number of L c reconstructed in pK p, pK S, Lp, and other modes.  Number of proton/lepton reconstructed.  References:  MC at GeV for  b signal,  On and off-resonance data around  (4S) (dataset ) for continuum and BB background.

05/11/02Jianchun (JC) Wang3 Luminosity Fast turn out, thanks to David Kreinick

05/11/02Jianchun (JC) Wang4 Hadron Event Cross-section No significant structure found

05/11/02Jianchun (JC) Wang5 Quality of Data: dE/dX  Calibration of dE/dX is not included in fast pass2.  We run on PDS files after pass2 with correct dE/dX parameters.  Thanks to Guangpei and Roy.

05/11/02Jianchun (JC) Wang6 Quality of Data: L c Resolution  Fast pass2 is used.  The resolution is about 6 MeV.  Expect 3-4 MeV.  No XP or R2 cut in this plot.

05/11/02Jianchun (JC) Wang7 L c Cross-section Number of Reconstructed L c Integrated Luminosity Only pK p mode shown here Estimation of BB and continuum contribution

05/11/02Jianchun (JC) Wang8 Estimated Cross-section  This measurement ( average of all points ): s = (0.99  0.10) pb.  Continuum and BB background are estimated using data set 8, 10 and 11, assuming BB cross-section above 4S is 250pb.  Continuum (non-b): s (continuum) = ( 0.35  0.05 ) pb.  BB meson: s (BB) = ( 0.21  0.02 ) pb.  Sum of the two: s (continuum) + s (BB) = ( 0.56  0.04 ) pb.  Signal is estimated using MC: s ( L b ) = 1.68 pb assuming:   b  b production cross-section is 50 pb.  Br( L b  L c X)  Br( L c  pK p) = 100%  5% = 5%.  The excess is (0.43  0.11) pb, equivalent to  b  b production cross- section of (12.8  3.3) pb. ( Preliminary !!! )

05/11/02Jianchun (JC) Wang9 Further Check  The efficiency could be different due to different beam energy. We simulated BB event and continuum event at and GeV. The efficiency shows no difference.  Based on continuum MC simulation, and 3 nb hadronic cross-section at GeV we estimate that s = 0.40 pb in comparison with (0.35  0.05 ) pb from 4S data estimation.  PDG gives Br( B  L c X)  Br( L c  pK p) = (6.4  1.1)%  (5.0  1.3)%. Based on this we estimate that contribution from BB is s = 0.53 pb, more than double of (0.21  0.02 ) pb estimated from 4S data.  John Yelton’s CBX: Br( B  L c X)  Br( L c  pK p) = (2.15  0.08)  Using this value and MC efficiency, we get s = (0.35  0.01) pb.  Both estimations from 4S data and MC may not be good enough. We need MC using current detector condition.

05/11/02Jianchun (JC) Wang10 Proton Cross-section With at least on lepton in the event. Proton + Antiproton Antiproton Only

05/11/02Jianchun (JC) Wang11 Estimated Cross-section  This measurement (average of all points): s = (14.83  0.19) pb.  Continuum and BB background are estimated using data set 8, 10 and 11, assuming BB cross-section above 4S is 250pb.  Continuum (non-b): s (continuum) = ( 7.08  0.09 ) pb.  BB meson: s (BB) = ( 3.32  0.03 ) pb.  Sum of the two: s (continuum) + s (BB) = (  0.09 ) pb  After correction (  0.10 ) pb.  Signal is estimated using MC: s ( L b ) = (8.61  0.15) pb for 50 pb  b  b production cross-section is.  The excess is (3.29  0.21) pb, equivalent to  b  b production cross- section of (17.1  1.3) pb.  Using only antiproton, the excess is equivalent to  b  b production cross-section of (18.2  1.7) pb. ( Preliminary !!! )

05/11/02Jianchun (JC) Wang12 Estimated Cross-section  We thought that the muon efficiency would be higher at 11.27GeV.  MC of selected event did not show significant difference.  In proton/lepton events, the ratio of muon to electron are for BB and for continuum estimated from 4S data, while current data shows This could be due to detector inefficiency.  In rough estimation we increase the muon contribution to background by 29%.  The QQ decay table was tuned by Steve Blusk, we still have problem with pass2 using the new table.

05/11/02Jianchun (JC) Wang13 Proton Momentum Spectrum The excess could come from L b, or due to other reasons

05/11/02Jianchun (JC) Wang14 Lepton Momentum Spectrum

05/11/02Jianchun (JC) Wang15 Need to Be Considered  The beam energy issue (see Dan’s talk).  The absolute value of integrated luminosity.  The BB cross-section in this region, contribution from other b-mesons.  The detector efficiency. We need to have realistic MC.

05/11/02Jianchun (JC) Wang16 Summary  The L b scan is still going on.  Preliminary quick results show that there are excess in both L c, and proton/lepton methods, which might come from L b. The nature of such excess is yet to be determined.  We are going to run at even lower point.

05/11/02Jianchun (JC) Wang17  c Decay Modes  0.27    1.3        0.27  0.8  0.26   1.3     0.27  0.8   0.3      1.0pK       0.39    0.7pK       0.8  0.39  0.26   1.0pK    0.8  0.39   0.6pK  2 ( 0.02 )   1.3pK    1  Br  Br(pK  ) Measured Eff (  ) Estimated Efficiency Br (%)Modes Not all modes will be used in scan, But most of them can be used in further study

05/11/02Jianchun (JC) Wang18 Decay Mode pK     Scaled to 12 pb .  Sum of three sources:  b  b pair, BB pair, and udsc continuum.  About 20  c from  b can be seen. M pK  (GeV) Number of Entries / 2 MeV

05/11/02Jianchun (JC) Wang19 Sum of Three Modes  S/  S+N    Background  C signal Sum pK S PK    Budsc bb B bb

05/11/02Jianchun (JC) Wang20 Proton Lepton Event  Require at least one muon or electron in the event.  With R2 < 0.2 cut.  The efficiency for  b  b event is 17%.  With 12 pb , reconstruct:  from  b  b events.  80.3 from udsc continuum.  30.1 from BB events.  S/  S+N = 7.1. XP p Number of Entries / 0.01

05/11/02Jianchun (JC) Wang21 Proton Lepton Event Number of Entries / 0.01

05/11/02Jianchun (JC) Wang22 Track Selection Criteria  Dedx information valid, and 3  consistence.  Grand LL: LL(K)-LL(pi)+Nsig(K)**2 – Nsig(pi)**2  RICH valid, P(K)>0.5 Gev, P(p)> 1GeV: Grand LL < - 4  Others: (no RICH), Grand LL < -4  Number of expected hits > 0, and number of hits > half of the expected.  Number of expected hits in fit > 0, track fitted, fit not abort.  Fit helix valid, track quality valid, track fit, not abort, degreesOfFreedom > 0, D0 < 0.6cm (0.35), Z0 < 5cm.

05/11/02Jianchun (JC) Wang23 Brief Selection Criteria  Good tracks.  P/K/  : Dedx, Grand LL (combine Dedx, RICH info).  Electron: Dedx, X925, E/P, Grand LL.  Muon: Dedx, Mudepth.   : X925, Barrel, no track matching, cos  CM.  K S : Fit quality(prob>0.01), Distance(r-  ) > 2mm.   : Fit quality(prob>0.01), Distance(r-  ) > 1mm.

05/11/02Jianchun (JC) Wang24 Proton Cross-section

05/11/02Jianchun (JC) Wang25 Lepton Cross-section

05/11/02Jianchun (JC) Wang26 Other Track Cross-section

05/11/02Jianchun (JC) Wang27 L c Expectation MC simulation  L b events: 50 pb at GeV  Br( L b  L c X)  Br( L c  pK p) = 100%  5% = 5%  Reconstruction efficiency: 33.5%  s ( L b ) = 50  2  0.05  = 1.68 pb Data set :  Continuum events: 1 pb at 5.635GeV  pb at GeV  BB events: 1 pb at 5.635GeV   0.25 = 0.22 pb at GeV  pb-1 off-resonance data: N off =  50.8  pb-1 on-resonance: N on =  N BB = N on - N off  =   s (continuum) = /  = ( 0.35  0.05 ) pb  s (BB) = /  = ( 0.21  0.02 ) pb  s (continuum) + s (BB) = ( 0.56  0.04 ) pb (error cancels)

05/11/02Jianchun (JC) Wang28 P + m /e Expectation MC simulation  L b events: 50 pb at GeV  Branching fractions: using current default in QQ decay table  Efficiency: 17.2 %  s ( L b ) = 50  = ( 8.61  0.15 ) pb (for anti-proton: 4.22  0.10) Data set 10+11:  Continuum events: 1 pb at 5.635GeV  pb at GeV  BB events: 1 pb at 5.635GeV   0.25 = 0.22 pb at GeV  pb-1 off-resonance data: N off = 6694 (3088)  pb-1 on-resonance: N on = (12436) N BB = N on - N off  = (8078.8)  s (continuum) = 6694/831.1  = (7.09  0.09) pb (3.27  0.06)  s (BB) = /  = (3.31  0.06) pb (1.52  0.04)  s (continuum) + s (BB) = (10.40  0.08) pb (4.79  0.05)

05/11/02Jianchun (JC) Wang29 L c Cross-section

05/11/02Jianchun (JC) Wang30 RICH Sequencer Issue: Number of Photon  Electrons from two L b runs.  Average number of photon per track increases from 11.8 to 13.0.

05/11/02Jianchun (JC) Wang31 RICH Sequencer Issue: Event Scan After fixing the sequencer code Before fixing the sequencer code

05/11/02Jianchun (JC) Wang32 RICH Sequencer Issue: D Reconstruction Efficiency  Data 17 is used.  With RICH reprocessed.  D* tagged D  K p.  The efficiency loss is 3.3  0.3%, with K within RICH acceptance.