Search for higher twists in meson resonance production in pi(-) N interactions at p(T)>=2 GeV/c

We study the production of meson resonance at p(T) greater than or equal to 2 GeV/c in pi(-) Be interactions at two beam energies (150 and 300 GeV/c). The motivation is to look for the higher twist (HT) production mechanism, expected to exist besides standard hadron production through the fragmentation process of scattered quarks and gluons, the so-called leading twist (LT) mechanism. We show that the phi, (K) over bar*(0)(892) and K*(0)(892) are found free from HT effects with a good accuracy, as expected from HT estimates and QCD sum rules. The magnitudes of the f(2)(1270) and rho(0) mesons signals are found larger than expected from the standard Lund (LT) Monte Carlo and from information provided by e(+)e(-) annihilation experiments. The possible connection of these excesses with HT physics is discussed. We also report the first evidence for the production of f(0)(975) mesons in hadronic experiments at large p(T).