HES-HKS analysis meeting 30 Aug 2013 Toshiyuki Gogami.

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Presentation transcript:

HES-HKS analysis meeting 30 Aug 2013 Toshiyuki Gogami

Contents Cross section of elementary processes – Introduction – Correction factors K + decay factor H reduction Results Bucking coil

K + Λ, K + Σ 0 cross sections SAPHIR : K.H. Glander et al., Eur. Phys. J. A 19, (2004) CLAS : R. Bradford et al., Phys. Rev. C 73, (2006) JLab E : P. Markoviz et al., Proceedings of SENDAI08 (2009) JLab E : F. Dohrmann et al., arXiv v2 (2007) γ (*) + p  K + + Λ γ (*) + p  K + + Σ 0 Preliminary 200 ± 16 ± 91 Preliminary 85 ± 13 ±34

Angular and momentum acceptance HES HKS W~1.93 GeV Q2Q2 θ K lab  θ K CM

Definition of cross section Solid angle of HKS Event by event The number of VP Including HES solid angle and acceptance The number of VP Including HES solid angle and acceptance

K + decay factor

Hydrogen reduction correction Figure: An photograph before and after the beam irradiation on the targets.

H reduction factor & Run selection /data/8d/gogami/MM/mm23/krd/lambda_reduction/targetpos/tpos2.dat Target position from EPICS 78.6 ± 9.9 %

Procedure 1.One W bin ( W~1.93 GeV ) 2.Three Q 2 bins ( W~1.93 GeV ) 3.Two angular bins ( W~1.93 GeV ) An original ROOT file  1.Add necessary information Jacobian, HKS solid angle, K + decay factor 2.Derive the QF background shape from 12 C data 3.Subtract the background shape 4.Estimate virtual photon (flux) by a Geant4 simulation 5.Calculate the cross section with efficiencies and correction factors

Results Θ lab e [rad]θ CM K [rad]Q 2 [GeV/c] 2 Λ (CMS) [nb/sr]Σ 0 (CMS) [nb/sr] (17) (32)55 (29) (10) (18) (29)51 (30) (10) (18) (30)81 (29) (17) (10) (31)78 (17) (15) Θ lab e [rad]θ CM K [rad]Q 2 [GeV/c] 2 Λ (CMS) [nb/sr]Σ 0 (CMS) [nb/sr] (32) (55)176 (12) (33) (12) (33)53 (24) (10) (12) (28)72 (20) (5)

12 Λ B g.s. from CH 2 target 52 (15) (4) nb/sr Polyethylene target 101 (4) (38) nb/sr in JLab E01-011

Hidden factor, 2 ?

Paper of bucking coil to NIMA ( final procedure )

Backup

Energy loss

K + absorption factor

Trigger efficiency

Charge distribution

H reduction