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A kinematically complete measurement of the proton structure function F2 in the resonance region and evaluation of its moments.

The CLAS collaboration Osipenko, M. ; Ricco, G. ; Taiuti, M. ; et al.

Phys.Rev.D 67 (2003) 092001, 2003.

Inspire Record 612145 DOI 10.17182/hepdata.12253

We measured the inclusive electron-proton cross section in the nucleon resonance region (W < 2.5 GeV) at momentum transfers Q**2 below 4.5 (GeV/c)**2 with the CLAS detector. The large acceptance of CLAS allowed for the first time the measurement of the cross section in a large, contiguous two-dimensional range of Q**2 and x, making it possible to perform an integration of the data at fixed Q**2 over the whole significant x-interval. From these data we extracted the structure function F2 and, by including other world data, we studied the Q**2 evolution of its moments, Mn(Q**2), in order to estimate higher twist contributions. The small statistical and systematic uncertainties of the CLAS data allow a precise extraction of the higher twists and demand significant improvements in theoretical predictions for a meaningful comparison with new experimental results.

46 data tables

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Resonances formed by anti-p p and decaying into pi0 pi0 eta for masses 1960-MeV to 2410-MeV.

Anisovich, A.V. ; Baker, C.A. ; Batty, C.J. ; et al.

Nucl.Phys.A 651 (1999) 253-276, 1999.

Inspire Record 504411 DOI 10.17182/hepdata.36177

Data on pbar-b annihilation in flight into pizero-pizero-eta are presented for nine beam momenta 600 to 1940 MeV/c. The strongest four intermediate states are found to be f_2(1270)-eta, a_2(1320)-pi, sigma-eta and a_0(980)-pi. Partial wave analysis is performed mainly to look for resonances formed by pbar-p and decaying into pizero-pizero-eta through these intermediate states. There is evidence for the following s-channel I = 0 resonances : two 4^{++} resonances with mass and width (M,Gamma) at (2044, 208) MeV and (2320+-30, 220+-30) MeV/ three 2^{++} resonances at (2020+-50, 200+-70) MeV, (2240+-40, 170+-50) MeV and (2370+-50, 320+-50) MeV/ two 3^{++} resonances at (2000+-40, 250+-40) MeV and (2280+-30, 210+-30) MeV/ a 1^{++} resonance at (2340+-40, 340+-40) MeV/ and two 2^{-+} resonances at (2040+-40, 190+-40) MeV and (2300+-40, 270+-40) MeV.

1 data table

Table 1

No description provided.

TRANSITION FORM-FACTOR OF THE VERTEX GAMMA P DELTA (1231) +. (IN RUSSIAN)

Akhmerov, R.V. ; Esaulov, A.S. ; Omelaenko, A.S. ; et al.

Yad.Fiz. 31 (1980) 156-166, 1980.

Inspire Record 157407 DOI 10.17182/hepdata.18229

None

4 data tables

Table 1

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Table 2

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A study of the reaction k- p ---> sigma0 eta near threshold

Jones, M.D. ;

Nucl.Phys.B 73 (1974) 141-165, 1974.

Inspire Record 94651 DOI 10.17182/hepdata.32322

The reaction K − + p → Σ 0 + η was studied using data from a 600 000 picture exposure at nine K − momenta from 862–1001 MeV/ c in the Lawrence Berkeley Laboratory 25″ liquid hydrogen bubble chamber. Cross sections were obtained using both events where the η decayed via neutrals and events where the η decayed into π + π − π 0 . Angular distributions were obtained from only those events where the η decayed into π + π − π 0 . The results are compared to previous analyses and the questions of the Ση decay rate and SU(3) classification of the 1 2 − Σ(1750) are discussed.

1 data table

Table 1

FROM BOTH ETA --> NEUTRALS AND ETA --> PI+ PI0 PI- EVENTS.