A SEARCH FOR F PRODUCTION IN 360-GeV/c pi- p INTERACTIONS

We present the results of a search for charm F mesons in 360 GeV/cπ̅p interactions. Several methods have been used; all yield no evidence for the F and are interpreted as 90% confidence level cross section upper limits

INCLUSIVE PROPERTIES OF D MESONS PRODUCED IN 360-GeV pi- p INTERACTIONS

The inclusive cross sections for forward D meson production at √s = 26 Gev in π-p interactions have been measured to be: σ(π̅p→D<SUP>0</SUP>/D<SUP>−0</SUP>)X<SUB>F</SUB>&gt;0 = (10.1±2.2) μb, σ(π̅p→D<SUP>±</SUP> + X)X<SUB>F</SUB>&gt;0 = (5.7±1.6) μb . The distribution in X<SUB>F</SUB>for all D and for X<SUB>F</SUB> &gt; 0 has the form dσ/dX<SUB>F</SUB> = 107<SUP>+39</SUP><SUB>-37</SUB>(1-X<SUB>F</SUB>)7.5<SUP>+2.5</SUP><SUB>-1.7</SUB> + 5.4<SUP>+6.0</SUP><SUB>-3.8</SUB>(1-X<SUB>F</SUB>)0.7<SUP>1.0</SUP><SUB>-0.7</SUB>μb, with evidence for leading D production. The P<SUP>2</SUP><SUB>T</SUB> distribution is exponential with slope parameter [−1.18<SUP>+0.18</SUP><SUB>−0.16</SUB>](GeV/c)<SUP>−2</SUP>. The data are compared with predictions from first-order quark/gluon fusion calculations

NEUTRAL D MESON PROPERTIES IN 360-GeV/c pi- p INTERACTIONS

Based on a sample of 22 four-prong D<SUP>0</SUP>/D<SUP>-0</SUP>/ decays produced in hydrogen by 360 GeV/cπ−, we present the following new results: mean lifetime τ = (3.5<SUP>+1.4</SUP><SUB>-0.9</SUB>x 10<SUP>-13</SUP>s; production cross section for x<SUB>F</SUB>&#62; 0.0, σ = (10.3 ± 3.5) ωb; the D → K<SUP>± </SUP>π<SUP>± </SUP>π<SUP>-</SUP>π<SUP>-</SUP>branching ratio = (7.1 ± 2.5)%