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MC pπ0γ - A2 Mainz

MC pπ0γ - A2 Mainz

Why γp → pπ 0 π 0

Why γp → pπ 0 π 0 Background?MC pπ 0 π 0 MC pπ 0 π 0●Supposed reason for γp → pπ 0 π 0 background:Decay photon from 1 st π 0 gets 'merged' with another decay photon from 2 nd π 01 photon gets lostInvariant mass of π 0 too high (includes lost photon) Missing Mass 2 using p and π 0 (γ' not used) doesn't give mass of 2 nd π 0Remaining background below cut limitSven Schumann Crystal Ball Collaboration Meeting Basel, Oct 05 2006

γp → pπ 0 π 0 Background Subtraction (1)●Calculate Missing Mass 2 using p and π 0MC pπ 0 γ'MC pπ 0 π 0MC pπ 0 γ' + pπ 0 π 0Data●●Scale MC pπ 0 γ' and MC pπ 0 π 0 spectra fitting to DataUse MC pπ 0 π 0 scaling factor to subtract γp → pπ 0 π 0 backgroundfrom γp → pπ 0 γ' result spectraSven Schumann Crystal Ball Collaboration Meeting Basel, Oct 05 2006

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