Collider Parameters: corrected time for wrong vertex

[charlemagne94]

Hello,

I stumbled across the following equation in a presentation about collider physics:

t_corr^WV =(t_i^RV - t_i^WV) + (TOF_RV - TOF_WV),

where t_corr^WV is the corrected time for the wrong vertex, t_i^RV is the initial time of the right vertex, t_i^RV is the initial time of the wrong vertex, TOF_RV is the time of flight from the right vertex, and TOF_WV is the time of flight from the wrong vertex.

I believe that t_i^RV is equal to zero by default, and the time of flight terms can be easily calculated from the kinematics of the collision. But I do not know what t_i^WV is.

Could someone familiar with collider physics elucidate the meaning of t_i^WV?

Thanks!

Edit: the presentation can be found at www-cdf.fnal.gov/~dcruz/DanielMasters.pptx
The equation in question is on slide 13.

 

[mfb]

I think t_i^WV alone is not an interesting quantity - it is better to look at the difference (t_i^RV - t_i^WV): The collisions do not occur all at the same time, as the bunch length is finite (I think something like 10cm or .3ns at the LHC, probably similar for the Tevatron). The time difference between those collisions (average 0, but with some width) is relevant for the width of the background shown in slide 12.