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Compute the average number of interactions per bunch crossing for a luminosity L=2.5E31 cms-1,if the total cross section is sigma =20mb and bunch crossing occur every T=4.What is the probability of having zero interactions in a bunch?

  • physics - ,

    What is a bunch crossing? Bunch of what?

    What are mb units? Millbarnes?

    cm/s is not a unit of luminosity

    What is T? What are its units?

    this is jibberish

  • physics - ,

    Trying to sort out the units.

    20 mb = 20 millibarns (mbarn)?

    the luminosity is presumably cm2 s^-1

    because by definition

    event rate = luminosity * cross section

    Not sure of units of T ns?

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