Update of ppg at large angle (LNF 20/02/2004) See: C.Bini, S.Ventura KLOE Memo 284 C.Bini, B.Di Micco KLOE Memo 285 (1) Results of the fit (2) Forward-Backward asymmetry (3) Upper limit on h p + p -. (1) Results of the fit. N(Q) = K [
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Update of ppg at large angle (LNF 20/02/2004)
See: C.Bini, S.Ventura KLOE Memo 284
C.Bini, B.Di Micco KLOE Memo 285
(1) Results of the fit
(2) Forward-Backward asymmetry
(3) Upper limit on h p+p-
N(Q) = K [
FISR(Q, Mr, Gr, a, b) + FFSR(Q) +
Ff0(Q, gfKK, R, mf0) FINT(Q) +
gFrp(Q) + dF3p(Q) ]
K = fcoll(Q) e(Q) L b
fcoll(Q) = correction for collinear radiation (EVA)
L= integrated luminosity (349 pb-1)
b= bin size (1.2 MeV)
Results stability checked vs.:
Bin size (1.2, 2.4, 6.0, 12.0 MeV)
First point (280 to 660 MeV)
Last point (996 to 1015 MeV)
- MC based abs.
- Achasov param.
- PDG abs. normalisation
- No interference (??)
compare the 3 hypotheses;
for fit0 hyp. stability estimate (second error)
Attempt to fit “forcing” f0 p0p0 KLOE parameters:
c2 = 3700
c2 = 1313
f0 p+p- after subtraction (red) vs. f0 p0p0 “raw” spectrum (blue)
2 possible explanations:
(1) p0p0g spectrum has “another contribution”
(2) p+p-g has “another interference scheme”
p+p- system: odd terms (green) and even terms (brown)
|A(tot)|2 = |A(ISR)|2 + |A(FSR)|2 + |A(f0)|2
+ 2Re[A(ISR) A(FSR)]
+ 2Re[A(ISR) A(f0)]
+ 2Re[A(FSR) A(f0)]
Asymmetry in p+p-q angle (depending on the cuts)
(triangles) MC gener.
(open circles) MC recon.
f0 signal in M(pp) spectrum and in FB asymmetry
(3) Upper limit for h p+p-
Ns < 21.1 (90%C.L.)
Nh = 1.43 107
(from 3p0 counting)
BR( h p+p-) < 8.9 10-6
Perspectives for publication and presentation at conferences:
(1) The fit of the M(pp) spectrum is in “final shape”;
(2) The FB-asymmetry reinforces the f0 signal
does not add any further insight:
needs “theoretical support”.
(3) The upper limit is also in “final shape”:
discussion on the way to extract the limit are welcome.