Background understanding and detector inefficiency

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Presentation transcript:

Background understanding and detector inefficiency Can we understand the remaining events from a view of photon inefficiency ? ( if possible, subtract them as backgrounds.) An Idea : Special trigger Kp2 but one photon is missed. (2) Event reconstruction Missing photon kinematics (3) Photon inefficiency as a function of its energy and direction ? NOTE : Different type of critical backgrounds.　　　　　　　　 Geometrical dependence : Detector hole, dead material Energy dependence 　 : Photonuclear interaction …

Phase space correction factors Polar angle distribution Correction factors Monte Carlo simulation Real data

Daughter Table Method w/ Binominal error Convoluted inefficiency Daughter tables produced by random number generator 300 daughter tables

p0  gg background subtraction

p0  gg background subtraction

Improvement by the subtraction Upper limit on Improvement (Before/After) Before subtraction After subtraction

Convoluted p0 rejection Results Dip angle dependence Next Slide … p0 rejection from 1gamma inefficiency tables. p0 rejection from real data (from pnn1 analysis.) p0 rejection from 1gamma inefficiency tables. p0 rejection from real data (from pnn1 analysis.)

Stretch functions

Kinematical Fitting Before/After Performance checks with MC sample

c2 Probability from Kin Fitting Kp2(1) for denominator map 1gamma for numerator map

Self-vetoing effect due to split photon MC simulation Missing photon kinematics

Single Photon Inefficiency

Single Photon Inefficiency

p0  gg detection inefficiency (1) Photon kinematics (2) Single photon inefficiency from MC simulation

Daughter Table Method w/ Binominal error Convoluted inefficiency Daughter tables produced by random number generator 300 daughter tables

Polar angle distribution Correction factors Monte Carlo simulation Real data

p0  gg background subtraction

p0  gg background subtraction

Improvement by the subtraction Upper limit on Improvement (Before/After) Before subtraction After subtraction

Abs(sin(theta)) < 0.45 Energy leakage Einner > 10 MeV

Fiducial Constraints

Performance of the clustering Method MC sample theta

p0 gg backgrounds Photon inefficiency 20<Eg[MeV]<225 Low energy g : sampling fluctuation High energy g: photonuclear interaction ( hard to simulate reliably.) Detector photon inefficiency (measured with real data) 20~40MeV 40~60MeV 60~80MeV 80~100MeV 100~120MeV 120~140MeV 140~160MeV