T. Maki

Analyzing power in inclusive π+ and π− production at high xF with a 200 GeV polarized proton beam☆

The analyzing power in inclusive charged pion production has been measured using the 200 GeV Fermilab polarized proton beam. A striking dependence in x(F) is observed in which A(N) increases from 0 to 0.42 with increasing x(F) for the pi+ data and decreases from 0 to -0.38 with increasing x(F) for pi- data. The kinematic range covered is 0.2 less-than-or-equal-to x(F) less-than-or-equal-to 0.9 and 0.2 less-than-or-equal-to p(T) 2.0 GeV/c. In a simple model our data indicate that at large x(F) the transverse spin of the proton is correlated with that of its quark constituents.

First measurement of the π+π- atom lifetime

The goal of the DIRAC experiment at CERN (PS212) is to measure the

DIRAC: A High Resolution Spectrometer for Pionium Detection

pi^+pi^-

Large-xF spin asymmetry inπ0 production by 200-GeV polarized protons

atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the

Determination of

S

\pi\pi

-wave

scattering lengths from measurement of

pipi

\pi^+\pi^-

scattering lengths combination

atom lifetime

|a_0-a_2|

The design and performance of the FNAL high-energy polarized beam facility

. Based on part of the collected data we present a first result on the lifetime,