Overview of the pnn 2 analysis David Jaffe

Start from status as of 18 August 2005 Done In progress 2 -3 May

Now In progress Machinery in place Not yet begun. 14. 009 In progress. 0004

K-050, Dima Done, Benji & Ilektra Done, Dima In progress, Ilektra Re-optimize PV with

K-045 “Study of target CCD pulse fitting analysis” Joe, Joss In progress, Joss Not

K-051, Sasha Not yet begun Perhaps we should be satisfied with the pnn 1

Wang Zhe Done, Wang Zhe In progress Done http: //hep. tsinghua. edu. cn/~wangzhe/e 949/Sep

In progress Complication: E 949 pnn 2 trigger = (E 787 pnn 2) *

Wang Zhe Done Machinery in place, await final cuts Done Generation of UMC samples

Other tasks Acceptance Km 2 -based acceptance Piscat-based acceptance Kp 2 -based acceptance UMC-based

Summary and comment • A great deal of progess has been made since 18

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Overview of the pnn 2 analysis David Jaffe 2 -3 May 2006 Schedule • Overview (David) • Kpi 2 -scatter background • Photon veto (Ilektra) • CCDPUL (Joss) • Beam background (Benji) • MC & related backgrounds (Wang Zhe) • Discussion 2 -3 May 2006 1

Start from status as of 18 August 2005 Done In progress 2 -3 May 2006 2

Now In progress Machinery in place Not yet begun. 14. 009 In progress. 0004 Background numbers are preliminary, we’ll hear about them at this meeting. 2 -3 May 2006 3

K-050, Dima Done, Benji & Ilektra Done, Dima In progress, Ilektra Re-optimize PV with AD incl. , kerror treatment, Ilektra No validated CCDPUL cut There is probably a gain of ~1. 1 in R*A by rejecting events with apparent hardware errors “kerror” (Jim, Ilektra) 2 -3 May 2006 4

K-045 “Study of target CCD pulse fitting analysis” Joe, Joss In progress, Joss Not yet Maybe we should be satisfied with doing as well as Bipul 2 -3 May 2006 5

K-051, Sasha Not yet begun Perhaps we should be satisfied with the pnn 1 TD acceptance 2 -3 May 2006 6

Wang Zhe Done, Wang Zhe In progress Done http: //hep. tsinghua. edu. cn/~wangzhe/e 949/Sep 16. ps 2 -3 May 2006 7

In progress Complication: E 949 pnn 2 trigger = (E 787 pnn 2) * (Cpibar + PS 16) In principle, the 1 beam bkgd estimate should come from (E 787 pnn 2)*PS 16 which has lower statistics. 2 -3 May 2006 8

Wang Zhe Done Machinery in place, await final cuts Done Generation of UMC samples of Ke 4, CEX the same size as those used in E 787 pnn 2 is done. Wang Zhe is beginning analysis of Ke 4 in data using E 787 techniques 2 -3 May 2006 9

Other tasks Acceptance Km 2 -based acceptance Piscat-based acceptance Kp 2 -based acceptance UMC-based pnn acceptance (MC already generated) T. 2 efficiency fs (K stopping fraction) Br(Kp 2) measurement as cross-check pnn branching ratio measurement Combination of all E 787 & E 949 pnn results Limit on K+ pi+, X (needs UMC) 2 -3 May 2006 10

Summary and comment • A great deal of progess has been made since 18 Aug 05 • A great deal of work remains to be done and the pnn 2 analysis team is and will be shrinking • We want a correct result, but it may not be optimal (“The better is the enemy of the good. ”-Ed Thorndike) 2 -3 May 2006 11