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Study of φ(1020), D*± and B* spin alignment in hadronic Z0 decays

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Zeitschrift für Physik C Particles and Fields

Abstract

Measurements of helicity density matrix elements have been made for the φ(1020), D*± and B* vector mesons in multihadronic Z0 decays in the OPAL experiment at LEP. Results for inclusive φ produced with high energy show evidence for production preferentially in the helicity zero state, with ρ 00 = 0.54 ± 0.08, compared to the value of 1/3 expected for no spin alignment. The corresponding element for the D*± has a value of 0.40 ± 0.02, also suggesting a deviation from 1/3. The B* result, with ρ 00 = 0.36 ± 0.09, is consistent with no spin alignment. Off-diagonal elements have been measured for the f and D* mesons; for the D* the element Re ρ 1−1 is non-zero, indicating non-independent fragmentation of the primary quarks.

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The OPAL Collaboration. Study of φ(1020), D*± and B* spin alignment in hadronic Z0 decays. Z Phys C - Particles and Fields 74, 437–450 (1997). https://doi.org/10.1007/s002880050406

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  • DOI: https://doi.org/10.1007/s002880050406

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