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Update of ppg at large angle (LNF 20/02/2004) See: C.Bini, S.Ventura KLOE Memo 284PowerPoint Presentation

Update of ppg at large angle (LNF 20/02/2004) See: C.Bini, S.Ventura KLOE Memo 284

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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)

e(Q) = efficiency

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)

- 3p background (surviving
- the cuts):
- p+p-p0
- MC based abs.

normalisation d

- rp background:
- rp , r pg
- Achasov param.

- PDG abs. normalisation

g

- No interference (??)

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”

(2) Forward-backward asymmetry

p+p- system: odd terms (green) and even terms (brown)

A(ISR) C-odd

A(FSR) C-even

A(f0) C-even

|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)

Comparison with MC: Eva + Geanfi reconstruction:

(red) data

(triangles) MC gener.

(open circles) MC recon.

- data-MC discrepancy below 700 MeV
- Clear f0 effect
- Data > MC between 700 and 900 MeV

f0 signal in M(pp) spectrum and in FB asymmetry

(3) Upper limit for h p+p-

- Expected signal:
- Gaussian m = 547.3 MeV
- s = 1.33 MeV
- Ns = -22 24
Ns < 21.1 (90%C.L.)

Nh = 1.43 107

(from 3p0 counting)

BR( h p+p-) < 8.9 10-6

- Comments:
- Factor 37 improvement respect to previous limit
- The negative fluctuation helps !

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

BUT

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.

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