Feasibility study for the measurement of πN transition distribution amplitudes at P¯

Abstract

The exclusive charmonium production process inpp annihilation with an associated π 0 mesonpp → J=ψπ 0 is studied in the framework of QCD collinear factorization. The feasibility of measuring this reaction through the J=ψ → e þ e − decay channel with the AntiProton ANnihilation at DArmstadt (PANDA) experiment is investigated. Simulations on signal reconstruction efficiency as well as the background rejection from various sources including thepp → π þ π − π 0 andpp → J=ψπ 0 π 0 reactions are performed with PANDAROOT, the simulation and analysis software framework of thePANDA experiment. It is shown that the measurement can be done atPANDA with significant constraining power under the assumption of an integrated luminosity attainable in four to five months of data taking at the maximum design luminosity.

Backward charmonium production in πN collisions

“…The obtained cross section estimates give hope of experimental accessibility of the reaction. A specific feasibility study similar to that recently performed for accessing N → π TDAs atPANDA [29,11,12] should be performed with J-Parc experimental efficiencies, as it has been done for exclusive forward lepton pair production at J-Parc [9].…”

“…as a function of θ * π showing the result for P π = 10, 15, 20 GeV and for −1 GeV 2 ≤ ∆ 2 ≤ u max , where u max is the threshold value (12) Since these rates are certainly within the experimental reach of the J-Parc experiment, the study of the reaction (1) will provide a valuable universality test for the TDA approach since the same TDAs also arise in the description of NN → γ * π [14], NN → J/ψπ [11,12] and backward pion electroproduction off a nucleon γ * N → πN [23].…”

Oxygen diffusion process in a Ba0.96La0.04SnO3thin film on SrTiO3(001) substrate as investigated by time-dependent Hall effect measurements

“…where e r is the relative permittivity of BSO (e r $20) [33], e 0 is the vacuum permeability, h is Planck's constant, Z is the effective charge of the ionized impurity (e.g., Z ¼ þ2 for V O and Z ¼ þ1 for La 3þ ), m* is the effective mass of BSO (m* ¼ 0.6m 0 ) [34], e is the charge of an electron, and N i is the number of ionized dopant per unit volume. Considering that n of the BLSO film should be the sum of concentrations of the La dopant (n La ¼ N La ) and V O (n Vo ¼ 2N Vo ), Eq.…”

Influences of Liquid‐Phase Sintering on Structure, Grain Growth, and Dielectric Behavior of PbZr0.52Ti0.48O3 Ceramics

“…The details of the procedure of synthesis can be found elsewhere. 16,26 For the preparation of ZB glass, ZnO and B 2 O 3 were mixed for 4 h in mortar and pestle in the presence of acetone. This powder was melted at 1150°C for 0.5 h and then quenched in ice to form glass.…”