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W H x y x œ š W W ± Ÿ Ÿ ² ª 63 7 "" ` C C E D # C B A @ " "? > Eletrons and Photons Algorithm m algorithm to find eletron and photon andidates uses a 3x3 trigger tower sliding window entered on all HCA trigger towers out to η 25 ] A diagram of this eletromagneti algorithm is shown in igure wo types of eletromagneti objets are defined The nonisolated eletronphoton identifiation is based y Y y Y A large energy deposit in one or two adjaent ECA 5rystal φ strips in the trigger tower Y The lateral shower profile in the entral tower omparing maximum E T of eah of four pairs of strips of 5 rystals to the total tower level E T of all 25 rystals (inerain or Veto) z b W The longitudinal shower profile defined by the ratio of E T deposits in the HCA and ECA portions of the alorimeter (HE Veto) b W isolated eletronphoton has two additional requirements: The ECA E T deposited in one of the 5 trigger towers surrounding the entral tower is below a programmable E T threshold z x W The 8 trigger towers surrounding the entral tower in the 3x3 region have passed the and HE vetoes š š ^ H ah alorimeter region (x trigger towers) the highest E T nonisolated and isolated eletromagneti didates are found This orresponds 6 andidates of eah type per regional trigger rate ( ηx φ3x7) are sorted by transverse energy The four andidates with the highest E T are sent to the lobal Calorimeter ger (CT) The CT sorts them one more and the four with the highest E T of eah type are forwarded 2 to lobal Trigger for further proessing ± ª² ª«evel single em 2 33 2 m s µ ³ All After HoE After isolation Rate (khz) Sliding window entered on all ECAHCA trigger tower pairs 75 η η ²º ±ª² ª ¹ «75 φ ¼ φ Candidate Energy: Had Max E t of Neighbors Max EM Hit Max E t > Threshold Hit Max Hit 87 φ 2 25 3 35 5 evel E T (95) (ev) 87 η 2 9 a igure 3: Diagram of the eletromagneti algorithm
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