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


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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 -. (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

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Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

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-


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

(1) Results of the fit

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)


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

  • 3p background (surviving

  • the cuts):

  •  p+p-p0

    - MC based abs.

    normalisation  d

  • rp background:

  •  rp , r  pg

    - Achasov param.

    - PDG abs. normalisation

     g

    - No interference (??)


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

- interference

no interference

+ interference


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

Table with fit results:

compare the 3 hypotheses;

for fit0 hyp. stability estimate (second error)


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

Attempt to fit “forcing” f0 p0p0 KLOE parameters:

Fit0

c2 = 3700

Fit-

c2 = 1313


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

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”


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

(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)


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

The integrated FB-asymmetry is (two definitions):


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

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


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

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


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

(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 !


Update of ppg at large angle lnf 20 02 2004 see c bini s ventura kloe memo 284

Conclusions:

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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