Search results for "pi0"
showing 10 items of 242 documents
"Table_T14" of "Threshold ��0 photoproduction on transverse polarised protons at MAMI"
2022
Target asymmetry T for c.m. cos(Theta_pi0)= -0.707
"Table_T07" of "Threshold ��0 photoproduction on transverse polarised protons at MAMI"
2022
Target asymmetry T for c.m. cos(Theta_pi0)= 0.423
"Table_T17" of "Threshold ��0 photoproduction on transverse polarised protons at MAMI"
2022
Target asymmetry T for c.m. cos(Theta_pi0)= -0.966
"Table_T01" of "Threshold ��0 photoproduction on transverse polarised protons at MAMI"
2022
Target asymmetry T for c.m. cos(Theta_pi0)= 0.996
"Table_T02" of "Threshold ��0 photoproduction on transverse polarised protons at MAMI"
2022
Target asymmetry T for c.m. cos(Theta_pi0)= 0.966
Measurement of inclusive pi(0) production in hadronic Z(0) decays
1996
An analysis is presented of inclusive \pi^0 production in Z^0 decays measured with the DELPHI detector. At low energies, \pi^0 decays are reconstructed by \linebreak using pairs of converted photons and combinations of converted photons and photons reconstructed in the barrel electromagnetic calorimeter (HPC). At high energies (up to x_p = 2 \cdot p_{\pi}/\sqrt{s} = 0.75) the excellent granularity of the HPC is exploited to search for two-photon substructures in single showers. The inclusive differential cross section is measured as a function of energy for {q\overline q} and {b \bar b} events. The number of \pi^0's per hadronic Z^0 event is N(\pi^0)/ Z_{had}^0 = 9.2 \pm 0.2 \mbox{(stat)} \…
Structure of pion photoproduction amplitudes
2018
We derive and apply the finite energy sum rules to pion photoproduction. We evaluate the low energy part of the sum rules using several state-of-the-art models. We show how the differences in the low energy side of the sum rules might originate from different quantum number assignments of baryon resonances. We interpret the observed features in the low energy side of the sum rules with the expectation from Regge theory. Finally, we present a model, in terms of a Regge-pole expansion, that matches the sum rules and the high-energy observables.
Rosenbluth Separation of the π^{0} Electroproduction Cross Section.
2016
We present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$--values ranging from 1.5 to 2 GeV$^2$, obtained from experiment E07-007 that ran in the Hall A at Jefferson Lab. The Rosenbluth technique was used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component, and thus is far from the asymptotic limit predicted by perturbative Quantum Chromodynamics. An indication of a non-zero longitudinal contribution is provided by the interference term $\sigma_{LT}$ also measured. Results are compared with several models based on the leading twist approach of G…
"Table 1" of "Backward electroproduction of pi0 mesons on protons in the region of nucleon resonances at four momentum transfer squared Q**2 = 1.0-Ge…
2005
Cross section SIG(T) + EPSILON*SIG(L) for COS(THETA*) = -0.975.
"Table 9" of "Backward electroproduction of pi0 mesons on protons in the region of nucleon resonances at four momentum transfer squared Q**2 = 1.0-Ge…
2005
Cross section SIG(TT) for COS(THETA*) = -0.975.