All events can be found in

/castor/cern.ch/user/t/truf/2010/Jpsi/JpsiForPano_magdown.dst
/castor/cern.ch/user/t/truf/2010/Jpsi/JpsiForPano_magup.dst

Powerpoint slides under development  and pdf

3d ps version          

* runNumber * eventNumb * Jpsi_tau     * nPV
************************************************
* 69860        * 3754057     * 3.4184768 * 1

XY projection

Yellow: Jpsi candidate

Red: Muon candidates

 
 TOP:       XY projection
BOTTOM: scaled 10:1 XZ projection

other tracks displayed, light blue:
Long tracks with pt>500MeV/c

vertex ellipses represent 3sigma contour
 

 

 

* 69618      * 12484     * 0.5975813 * 1

There is third track matching with the Jpsi vertex, track #17:

>>> proto17.richPID()
{ pidResultCode : 8116
particleLLValues : [-3.7407, -1.5838, 0, 17.1346, -15.7914]

pointing angle of J/psi, LOKI_DIRA =  0.9988986
(my private calc, cos(α) = 0.998898689)

adding the third track: pointing LOKI_DIRA = 0.9999058
(my private calc, angle cos(α)  = 0.99994524)

inv mass with pion hypothesis: 5256 MeV/c2

inv mass with kaon hypothesis: 5315 MeV/c2

PV sigz,sigy,sigz (in mm)         24.5825 7.2 7.7 44.4
SecVx sigz,sigy,sigz (in mm)   11.2 10.6  66.91

 

 

* 69625 * 45507449 * 0.2373959 * 1

 
 

 

Information about expected yield (Olivier Leroy):

In 4pi, I found the following cross-sections:
sigma(pp=>JpsiX) = 0.115 +/- 0.012 mb
sigma(pp=>b=>JpsiX) = 0.013 +/- 0.001 mb

Hence, we expect 11.3% of the Jpsi to come from b.

i.e. ~4 b=>JpsiX candidates among the ~36 Jpsi candidates I see.

(b=>JpsiX