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SUMMARY:The KLOE-2 High Energy Taggers
DTSTART;VALUE=DATE-TIME:20170227T083000Z
DTEND;VALUE=DATE-TIME:20170227T085000Z
DTSTAMP;VALUE=DATE-TIME:20260712T002044Z
UID:indico-contribution-1754@indico.inp.nsk.su
DESCRIPTION:Speakers: Francesca Curciarello (INFN-LNF)\nThe precision meas
 urement of the $\\pi^0\\to \\gamma \\gamma$ width allows to gain insights 
 into the strong QCD dynamics.  A way to achieve the precision needed (1%) 
 in order to test Theory predictions is to study the $\\pi^0$ production tr
 ough $\\gamma \\gamma$ fusion in the $e^+ e^-  \\to e^+ e^- \\gamma^{\\sta
 r} \\gamma^{\\star}\\to e^+ e^- \\pi^0$ reaction. The KLOE-2 experiment\, 
 currently running at the DA$\\Phi$NE facility in Frascati\, aims to perfor
 m this measurement. For this reason\,  new detectors\, which allow to tag 
 final state leptons\, have been installed along the DA$\\Phi$NE beam line 
 in order to reduce the huge background coming from $\\phi$-meson decays. \
 nThe High Energy Tagger (HET) detector measures the deviation of leptons f
 rom their main orbit by determining their position and timing. The HET det
 ectors are placed in roman pots just at the exit of the DA$\\Phi$NE dipole
  magnets\, 11 m away from the IP\, both on positron and electron sides. Th
 e HET sensitive area is made up of a set of 28 plastic scintillators. A de
 dicated DAQ electronic board\, based on a Xilinx Virtex-5 FPGA\, has been 
 developed for this detector. It provides a MultiHit TDC with a time resolu
 tion of 550(1) ps and the possibility to clearly identify the correct bunc
 h crossing ($\\Delta T_{bunch}\\sim 2.7 \\rm~ns$). The most relevant featu
 res of the KLOE-2 tagging system operation as time performance\, stability
 \, efficiency\, and the techniques used to determine the time overlap betw
 een the KLOE and HET asynchronous DAQs will be presented.\n\nhttps://indic
 o.inp.nsk.su/event/8/contributions/1754/
LOCATION:
URL:https://indico.inp.nsk.su/event/8/contributions/1754/
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