Measurement of inclusive production of neutral pions at high transverse momentum. [100 to 300 GeV/c, scaling]

Technical Report · Sun Oct 01 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/6362434· OSTI ID:6362434

Ogawa, A.

These are the results of a measurement of inclusive production at high transverse momentum (P perpendicular to) of neutral pions (..pi../sup 0/) from protons by beams of proton (p), kaon (K), pion (..pi..), and antiproton (antiproton) particles. The experiment used the Fermilab M2 beam line at momenta of 100, 200 and 300 GeV/c striking a liquid hydrogen target. The data include center of mass (cm) production angles of the ..pi../sup 0/ between 2/sup 0/ and 115/sup 0/ for P perpendicular to greater than 1 GeV/c. A pair of differential Cherenkov counters distinguished the types of beam particles. The photon (..gamma..) detector of a lead and scintillator sandwich measured both photons from the ..pi../sup 0/ ..-->.. 2..gamma.. decay and enabled a reconstruction of the ..pi../sup 0/ kinematics. The measurements show several remarkable features distinguishing the production rates for these different beams, including a forward peak in the cm for ..pi..p collisions and much less ..pi../sup 0/ production at high P perpendicular to in pp than in ..pi..p or Kp collisions. A simple parametrization accurately represents the data over most of its range, showing approximate scaling in the radial variable x/sub R/ = 2P/..sqrt..s (in the cm). Several parton models are compared with the data. A heuristic picture in terms of the quark constituents of the interacting hadrons accounts for many features of the data in an intuitive way. 62 references.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6362434
• Report Number(s): LBL-8305; TRN: 79-004394
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
KAON-PROTON INTERACTIONS
INCLUSIVE INTERACTIONS
PION-PROTON INTERACTIONS
PIONS NEUTRAL
PARTICLE PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
PROTON-PROTON INTERACTIONS
GEV RANGE 100-1000
PARTON MODEL
QUARK MODEL
SCALE INVARIANCE
TRANSVERSE MOMENTUM
BARYON-BARYON INTERACTIONS
BOSONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
KAON-NUCLEON INTERACTIONS
LINEAR MOMENTUM
MATHEMATICAL MODELS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PION-NUCLEON INTERACTIONS
PIONS
PROTON-NUCLEON INTERACTIONS
PSEUDOSCALAR MESONS
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