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Pile-up vertex finding in heavy ion collisions

Pile-up vertex finding in heavy ion collisions. Marco van Leeuwen, LBNL. Some numbers. TPC drift time ~40 m s Time between events without pile-up: 80 m s Interaction rate with single pile-up 12.5 kHz Rate at Run 4 Au+Au: 3-10 kHz Rate at Run 5 Cu+Cu: 8-25 kHz

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Pile-up vertex finding in heavy ion collisions

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  1. Pile-up vertex finding in heavy ion collisions Marco van Leeuwen, LBNL

  2. Some numbers • TPC drift time ~40 ms • Time between events without pile-up: 80 ms • Interaction rate with single pile-up 12.5 kHz • Rate at Run 4 Au+Au: 3-10 kHz • Rate at Run 5 Cu+Cu: 8-25 kHz • Expected rate Au+Au RHIC II: ~ 60 kHz

  3. Pile-up vertex finding Incidence of tracks on beam axis (z-coord) Display (not the same event) Duncan Prindle Step 1: identify vertex candidates Resolution few cm # candidates: 1 triggered interaction + 2x pile-up

  4. Vertex selection parameters Number of BEMC hits Tracks crossing central membrane Mean-dip Red lines: parametrised ‘expected’ trends Step II: assign weights (rank) based on several properties

  5. Results Before Efficiencies After Anthony Timmins Confusion/inefficiency reduced to a few per cent in Cu+Cu

  6. Future expectations Anthony Timmins Method tested to 20-30 kHz rates (Cu+Cu) Will likely work up to expected RHIC II Au+Au rates, 60 kHz Lighter ions@RHIC II could be problematic (but see p+p experience) Caveat: track density for Au+Au @ 60 kHz larger than 25kHz Cu+Cu However, pile-up events are minbias, so not too worried

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