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$Studies of Diffractive Particle Production at COMPASS ... - CERN$

Outline • Introduction • The COMPASS experiment • Analysis • Event selection • Acceptance and background subtraction • Results • M(p fast V) • R(φ/ω) as a function of x F (p fast ) and p V • Spin alignment in the helicity frame • Spin alignment in the exchange particle frame • The relation between spin alignment and R(φ/ω) • What do we learn from this?
Introduction: The OZI rule • The Okubo-Zweig-Iizuka (OZI)* rule states that processes with disconnected quark lines are supressed. • Production of φ should then be allowed only thanks to deviation from ideal mixing, δ V = 3.7 o , and be suppressed w.r.t. ω production according to (AB →φ X)/(AB →ωX) = tan 2 δ V = 4.2 · 10 −3 ** where A, B and X are non-strange hadrons. * S. Okubo, Phys. Lett. 5 (1963) 165, G. Zweig, <strong>CERN</strong> report TH-401 (1964), J. Iizuka, Prog. Theor. Suppl. 38 (1966) 21 ** H.J. Lipkin, Phys. Lett. B 60 (1976) 371
Page 1: Karin Schönning, Uppsala Universit
Page 5 and 6: * K. Gottfried & J.D. Jackson, Nuov
Page 7 and 8: The COMPASS experiment At the COMPA
Page 9 and 10: Analysis Background subtraction: A
Page 11 and 12: The M(p fast V) invariant mass •
Page 13 and 14: R(φ /ω) as a function of x F The
Page 15 and 16: The ρ 00 w.r.t M(p fast V) for ω
Page 17 and 18: The ρ 00 in the exchange particle
Page 19 and 20: What do we learn from this? • The

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