Existing pion+nucleus Drell-Yan and electron+pion scattering data are used to develop ensembles of model-independent representations the pion generalised parton distribution (GPD). Therewith, one arrives at a data-driven prediction for mass form factor, $\theta_2$. Compared with elastic electromagnetic $\theta_2$ is harder: ratio radii derived from these two factors $r_\pi^{\theta_2}/r_\pi = 0....

The effects of multi-pion correlations and finite coherent length on two-pion interferometry are studied. It was shown that as the pion multiplicity and coherent length become larger, the apparent radius and the apparent coherent parameters derived from two-pion interferometry become smaller. The influence of the coherent length on the effective temperature is discussed. PACS number(s): 25.75 D...

We revisit the $DD^\ast$ interactions in chiral effective field theory up to third order for first time. deal with pion-exchanged via local momentum-space regularization, which we focus on their long-range behaviors through demanding contributions vanish at origin coordinate space. The short-range contact and subleading pion-charmed meson couplings are estimated phenomenological resonance satur...

Recent developements in our understanding of the fundamental nucleon-nucleon interaction are reviewed. Among the topics considered are (1) the so-called high-precision nucleon-nucleon potentials that emerged in the mid 1990s, (2) progress in the microscopic description of the intermediate-range part of the nucleon-nucleon interaction in terms of correlated pion-pion and rho-pion exchange and (3...

The role of chiral (pion) dynamics in nuclear matter is reviewed. Contributions to the energy per particle from oneand two-pion exchange are calculated systematically, and it is demonstrated that already at order k f in the Fermi momentum, two-pion exchange produces realistic nuclear binding together with very reasonable values for the compressibility and the asymmetry energy. Further implicati...

The influence of the multi-boson effects on pion multiplicities, single-pion spectra and two-pion correlation functions is discussed in terms of an analytically solvable model. It is argued that spectacular multi-boson effects are likely to be observed only in the rare events containing sufficiently high density fluctuations. The possibilities of unlike particle correlations for a study of the ...

Next to leading order predictions for π 0 γ and π 0 π 0 production at the LHC The precise knowledge of photon pair production rates at the LHC is crucial to estimate the sensitivity to a Higgs boson in the intermediate mass range. This background consists not only of prompt photons but also of fake photons stemming from pion decay. We present next to leading order predictions for the invariant ...

In high energy heavy ion collisions the pion multiplicity is large, and one might expect that pions are radiated semi-classically. The axial symmetry of the collision and approximately zero isotopic spin of the colliding nuclei result then in peculiar isotopic spin – azimuth correlations of the produced pions. These correlations are easy to test – and should be tested Alexander von Humboldt For...

The cross section of hard diffractive dissociation of the pion into two jets is calculated. It is obtained that the distribution of longitudinal momenta for jets is not simply proportional to the profile of the pion wave function, but depends on it in a complicated way. In particular, it is shown that, under the conditions of the E791 experiment, the momentum distribution of jets is similar in ...

The dispersion relations which allow to express the two-pion light-cone distribution amplitudes (DA’s) in a wide range of two-pion invariant masses (including the resonance region) in terms of ππ scattering phase shifts and of a few low-energy subtraction constants are derived. The corresponding subtraction constants can be determined in the low energy region–where the effective chiral theory i...