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4/28/2005 DIS05, Diff. WG, Aharon Levy 1 Pomeron structure and diffractive parton distributions Aharon Levy with Halina Abramowicz and Michael Groys (MSc.

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Presentation on theme: "4/28/2005 DIS05, Diff. WG, Aharon Levy 1 Pomeron structure and diffractive parton distributions Aharon Levy with Halina Abramowicz and Michael Groys (MSc."— Presentation transcript:

1 4/28/2005 DIS05, Diff. WG, Aharon Levy 1 Pomeron structure and diffractive parton distributions Aharon Levy with Halina Abramowicz and Michael Groys (MSc Thesis) Tel Aviv University Special thanks to John Collins DIS05, Apr 28, 2005

2 4/28/2005 DIS05, Diff. WG, Aharon Levy 2 Contents Theoretical framework Experimental data Regge factorization test Data selection Results of NLO QCD fit Fraction of Pomeron momentum Probability of diffraction

3 4/28/2005 DIS05, Diff. WG, Aharon Levy 3 Theoretical framework Structure function data interpreted as Use Regge factorization In the NLO QCD calculations, include also F L.

4 4/28/2005 DIS05, Diff. WG, Aharon Levy 4 Diffractive peak “LPS” “LRG” Diffractive event selection

5 4/28/2005 DIS05, Diff. WG, Aharon Levy 5 Regge factorization test Assume form of flux is Test if A is function of Q 2 or of 

6 4/28/2005 DIS05, Diff. WG, Aharon Levy 6 Testing Regge factorization: Q 2 dependence

7 4/28/2005 DIS05, Diff. WG, Aharon Levy 7 Testing Regge factorization:  dependence

8 4/28/2005 DIS05, Diff. WG, Aharon Levy 8 Testing Regge factorization For x IP < 0.01, flux seems indeed independent of Q 2 and of .

9 4/28/2005 DIS05, Diff. WG, Aharon Levy 9 Reggeon and pion contributions in diffractive processes K. Golec-Biernat, J. Kwiecinski and A. Szczurek, Phys. Rev. D56 (1997) 3955.

10 4/28/2005 DIS05, Diff. WG, Aharon Levy 10 Data selection For QCD analysis

11 4/28/2005 DIS05, Diff. WG, Aharon Levy 11 Results of NLO QCD fits

12 4/28/2005 DIS05, Diff. WG, Aharon Levy 12 Fit results for ZEUS FPC data

13 4/28/2005 DIS05, Diff. WG, Aharon Levy 13 Fit results for ZEUS LPS data

14 4/28/2005 DIS05, Diff. WG, Aharon Levy 14 Fit results for H1 data

15 4/28/2005 DIS05, Diff. WG, Aharon Levy 15 Parton Distribution functions ZEUS FPCH1ZEUS LPS

16 4/28/2005 DIS05, Diff. WG, Aharon Levy 16 Two solutions of ZEUS LPS data gluons >> quarks gluons ≈ quarks

17 4/28/2005 DIS05, Diff. WG, Aharon Levy 17 ZEUS FPC data vs H1 fit

18 4/28/2005 DIS05, Diff. WG, Aharon Levy 18 H1 data vs ZEUS FPC fit

19 4/28/2005 DIS05, Diff. WG, Aharon Levy 19 Fraction of Pomeron momentum carried by quarks/gluons ZEUS LPS ZEUS FPC H1 ZEUS FPC LPS

20 4/28/2005 DIS05, Diff. WG, Aharon Levy 20 Probability of diffraction (see L. Frankfurt and M. Strikman, hep-ex/9907221)

21 4/28/2005 DIS05, Diff. WG, Aharon Levy 21 Probability of diffraction (2)

22 4/28/2005 DIS05, Diff. WG, Aharon Levy 22 FPC H1

23 4/28/2005 DIS05, Diff. WG, Aharon Levy 23 Summary and conclusions Regge factorization consistent with available data in the kinematic range: X IP 3GeV 2, M X >2GeV. NLO DGLAP fits done to data, contribution of F L included in the fit.

24 4/28/2005 DIS05, Diff. WG, Aharon Levy 24 Summary and conclusions (2) FPC and H1 data are incompatible in some of the kinematic regions studied. Fraction of the Pomeron momentum carried by gluons: H1 and LPS: 70-90% FPC: 55-65% Probability for diffraction: H1 results for x<10 -4 are unphysical. Gluon saturation?

25 4/28/2005 DIS05, Diff. WG, Aharon Levy 25

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