A. N. Maksimov

TheΛ c + production by 40–70 GeV neutrons on carbon

AbstractThe inclusive production of charmed baryonsΛc+ by 40–70 GeV neutrons on carbon has been observed. The decays

Production of\(\bar D^0 \) andD− mesons in neutron-carbon interactions at 40–70 GeV

\Lambda _c^ + \to \bar K^0 p\pi ^ + \pi ^ -

Production of the charmed baryon Λ c + in neutron-proton interactions

(130 ± 18 events) andΛc+→Λ0π+π+π− (57±14 events) have been detected. The mean value ofΛc+ mass is (2,268±6) MeV/c2. The invariant cross section forX>0.5 is described byE·d3σ/dp3∝ exp(−)bPT·(1−X)n withb=(2.5±0.6) (GeV/c)−1 andn=(1.5±0.5).The cross section of theΛc+ inclusive production measured forX>0.5 times the branching ratios are

Inclusive production of φ-mesons in neutron-proton interaction at 30-70 GeV/c

\sigma \cdot B(\bar K^0 p\pi ^ + \pi ^ - ) = (10 \pm 4)

A-Dependence of polarization ofΛ0 produced inclusively in neutron-nucleus interactions

μb per carbon nucleus and σ·B(Λ0π+π+π−)=(2.3±1.1) μb per carbon nucleus. The experiment has been performed in the neutron beam of the Serpukhov accelerator using the spectrometer BIS-2.

The study of\(\overline {D^0 } \to K^ + \pi ^ - \pi ^ + \pi ^ - \) in neutron interactions with hydrogen, carbon and aluminium ATtrs≈10 GeV

New data on the observation and study of a narrow resonance decaying intoΣ−(1,385)K+ have been obtained. The mass of the resonance is (1,956−6+8) MeV/c2, and its width is (27±15) MeV/c2. The resonance is produced in the diffraction dissociation of neutrons on quasi-free nucleons of carbon nuclei. The slope parameter of the differential cross section inPT2 is (9.9±3.0) (GeV/c)−2. The cross section times the branching ratio is (0.22±0.04) μb per nucleon. The resonance has one of the natural spinparities: 5/2+, 7/2− and so on.