Average formation lengths of baryons and antibaryons in a string model

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.014904· OSTI ID:21499356

Grigoryan, L ^[1]

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1. Yerevan Physics Institute, Br. Alikhanian 2, 375036 Yerevan (Armenia)

In this work the investigation of the space-time scales of the hadronization process in the framework of a string model is continued. The average formation lengths of several widely used species of baryons (antibaryons) such as p(p-bar), n(n-bar), {Delta}({Delta}-bar), {Lambda}({Lambda}-bar), and {Sigma}({Sigma}-bar) are studied. It is shown that they depend on electrical charges or, more precisely, on the quark contents of the hadrons. In particular, the average formation lengths of positively charged hadrons, for example, protons, are considerably larger than those of their negatively charged antiparticles, antiprotons. This statement for all nuclear targets and any values of the Bjorken scaling variable x{sub Bj} is fulfilled. The main mechanism is direct production. Additional production mechanism as a result of the decay of resonances gives small contribution. It is shown that the average formation lengths of protons (antiprotons) are slowly increasing (decreasing) functions of x{sub Bj}, whereas the ones of neutrons and antineutrons are slowly decreasing functions of x{sub Bj}. The shape and behavior of average formation lengths for baryons qualitatively coincide with the ones for pseudoscalar mesons obtained earlier.

• OSTI ID: 21499356
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 1; Other Information: DOI: 10.1103/PhysRevC.83.014904; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILAMBDA PARTICLES
ANTINEUTRONS
ANTIPROTONS
PARTICLE DECAY
PSEUDOSCALAR MESONS
QUARKS
RESONANCE
SCALING
SPACE-TIME
STRING MODELS
ANTIBARYONS
ANTIHYPERONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
BARYONS
BOSONS
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
HADRONS
HYPERONS
LAMBDA BARYONS
LAMBDA PARTICLES
MATHEMATICAL MODELS
MATTER
MESONS
NEUTRONS
NUCLEI
NUCLEONS
PARTICLE MODELS
PROTONS
QUARK MODEL
STRANGE PARTICLES