Maqola

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi/><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>20</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pN</mml:mi></mml:math>interactions at 300 GeV

B. S. YuldashevDepartment of Physics, University of Washington, Seattle, Washington 98195Sh. M. AlievDepartment of Physics, University of Washington, Seattle, Washington 98195M. A. AlimovDepartment of Physics, University of Washington, Seattle, Washington 98195Kh. Kh. ArtykovDepartment of Physics, University of Washington, Seattle, Washington 98195S. O. EdgorovDepartment of Physics, University of Washington, Seattle, Washington 98195Sh.V. InogamovDepartment of Physics, University of Washington, Seattle, Washington 98195Alex KhanelesDepartment of Physics, University of Washington, Seattle, Washington 98195E. A. KosonowskiDepartment of Physics, University of Washington, Seattle, Washington 98195S. L. LutpullaevDepartment of Physics, University of Washington, Seattle, Washington 98195N. RasulovDepartment of Physics, University of Washington, Seattle, Washington 98195T. P. RodionovaDepartment of Physics, University of Washington, Seattle, Washington 98195K.T. TurdalievDepartment of Physics, University of Washington, Seattle, Washington 98195E. TurumovDepartment of Physics, University of Washington, Seattle, Washington 98195A.A. YuldashevDepartment of Physics, University of Washington, Seattle, Washington 98195R. LovelessDepartment of Physics, University of Washington, Seattle, Washington 98195D. D. ReederDepartment of Physics, University of Washington, Seattle, Washington 98195

1991lv

ABI

Annotatsiya

Data on the multiplicity and inclusive spectra of $\ensuremath{\gamma}$ produced in inelastic $p^{20}\mathrm{Ne}$ and $\mathrm{pN}$ interactions at 300 GeV are presented. The $\ensuremath{\gamma}$ multiplicity for $p^{20}\mathrm{Ne}$ interactions is 11.43\ifmmode\pm\else\textpm\fi{}0.23, and the ratio of $〈{n}_{\ensuremath{\gamma}}〉$ for $p^{20}\mathrm{Ne}$ and $\mathrm{pN}$ interactions is 1.48\ifmmode\pm\else\textpm\fi{}0.05. From an analysis of the effective-mass distributions, $〈{n}_{{\ensuremath{\pi}}^{0}}〉=4.91\ifmmode\pm\else\textpm\fi{}0.52$ and $〈{n}_{{\ensuremath{\eta}}^{0}}〉=1.47\ifmmode\pm\else\textpm\fi{}0.33$. In fact, ${\ensuremath{\eta}}^{0}$ production is much higher in $p^{20}\mathrm{Ne}$ interactions [$R(\frac{{\ensuremath{\eta}}^{0}}{{\ensuremath{\pi}}^{0}})=0.66\ifmmode\pm\else\textpm\fi{}0.12$ for ${n}_{p}\ensuremath{\ge}21$] than in $\mathrm{pN}$ interactions [$R(\frac{{\ensuremath{\eta}}^{0}}{{\ensuremath{\pi}}^{0}})=0.06\ifmmode\pm\else\textpm\fi{}0.04$]. No ${\ensuremath{\eta}}^{\ensuremath{'}}(958)$ signal is seen. Strong correlations between $〈{n}_{\ensuremath{\gamma}}〉$ and ${n}_{p}$, the number of secondary protons, are observed, primarily from the central and target fragmentation regions. Inclusive ${y}^{*}$ and ${p}_{\ensuremath{\perp}}$ spectra are analyzed and evidence for low-energy cascading and rescattering of fast particles in the projectile fragmentation region is discussed. The data are compared to the predictions of the additive quark model, the Lund model, and the dual parton model.

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Identifikatorlar

DOI: 10.1103/physrevd.43.2803

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