Study of phi (1020), D*+- and B* spin alignment in hadronic Z0 decays - INSPIRE

DataBETA

Study of phi (1020), D+- and B spin alignment in hadronic Z0 decays

OPAL

Collaboration

Jan, 1997

31 pages

Published in:

Z.Phys.C 74 (1997) 437-449

DOI:

10.1007/s002880050406

Report number:

CERN-PPE-97-005,
CERN-PPE-97-05,
CERN-PPE-97-5

Experiments:

CERN-LEP-OPAL

View in:

CERN Document Server

reference search58 citations

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Abstract: (Springer)

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 ρ00 = 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 ρ00 = 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 ρ1−1 is non-zero, indicating non-independent fragmentation of the primary quarks.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
vector meson: production
Phi(1020): hadronic decay
D*(2010): hadronic decay
B*(5320): radiative decay
helicity: density matrix
spin: alignment

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