Measurement of the coulomb interaction effect in (pi)(sup +)(pi)(sup -) pairs from the reaction pTa(yields)(pi)(sup +)(pi)(sup -)X at 70 GeV

摘要

Production of (pi)(sup +)(pi)(sup -) pairs was studied for the reaction pTa(yields)(pi)(sup +)(pi)(sup -)X at 70 GeV. For the pions with lab momenta from 0.8 to 2.4 GeV/c the two-particle correlation function was measured in the interval of the c.m.s. relative momentum 0(<=)q(<=)50 MeV/c. The Coulomb final state interaction for pions produced in a region much smaller than 1/m(sub (pi))(alpha) leads to a sharp increase in the yield of (pi)(sup +)(pi)(sup -) pairs with q<10MeV/c. The effect of the Coulomb interaction has allowed separation of the (pi)(sup +)(pi)(sup -) pairs with respect to the size of their production region. 25 refs., 8 figs., 6 tabs. (Atomindex citation 28:015460)