ISSN:
1572-9486
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have observed the production of $$\bar D^0 $$ andD − mesons in neutron carbon interactions at 40–70 GeV/c. The experiment was performed with the spectrometer BIS-2 located in the neutron beam 4N of the Serpukhov accelerator. The signals of $$\bar D$$ mesons were detected in the effective mass spectraM(K + (890)π −) andM(K +(890)π − π −). The kinematical region of detected $$\bar D$$ mesons is 30 GeV/c 〈 pL 〈 60 GeV/c andp T 〈 1 GeV/c. For this region the partial cross sections are $$\sigma (n + C \to \bar D^0 + X)$$ . $$BR(\bar D^0 \to K^ + (890)\pi ^ - ) = (0 \cdot 9 \pm 0 \cdot 3)\mu b$$ andσ(n +C→ D − +X).BR(D − →K +(890) π−π−) = (2·1 ± 0·7) μb. The longitudinal momentum spectrum in the regionx 〉 0·5 can be described byF(x) ∼ (1 − x) N with $$N_{\bar D^0 } = 1 \cdot 1 \pm 0 \cdot 5 \pm 0 \cdot 4$$ and $$N_{D^ - } = 0 \cdot 8 \pm 0 \cdot 4 \pm 0 \cdot 4$$ . The transverse momentum spectra were parametrized by the exponential function dσ/dp T 2 ∼ exp (-Bp T 2 ) with $$B_{\bar D^0 } = (1 \cdot 4 \pm 0 \cdot 7)({{GeV} \mathord{\left/ {\vphantom {{GeV} c}} \right. \kern-\nulldelimiterspace} c})^{ - 2} $$ and $$B_{D^ - } = (1 \cdot 7 \pm 0 \cdot 8)({{GeV} \mathord{\left/ {\vphantom {{GeV} c}} \right. \kern-\nulldelimiterspace} c})^{ - 2} $$ .
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01598031
