Summary
A bound-state S= (VLVL), formed out of the strongly interacting longitudinal component of weak gauge bosons V= W±, Z0, which has been proposed by Veltman in the attempt to interpret the anomalous γll events observed at CERN SppS-collider, is studied phenomenologically. Adopting the nonrelativistic bound-state formalism we derive the effective couplings of Sff, Sγγ and SγZ0 and study the decay of the S-boson into various channels. The S may have a strong effective coupling to a heavy quark SUŪ, or to a heavy lepton SLL if there exists a heavy-quark pair (U, D), or a heavy-lepton pair (ΝL,L), satisfying the mass relation m 2u - m 2D , ≅ M 2W , or\(m_L^2 - m_{v_L }^2 \simeq M_W^2 \), respectively. If such a relation does not hold the S decays dominantly into the γγ(Z0) channel. Some production cross-sections at the future collider experiments are estimated.
Riassunto
Si studia fenomenologicamente uno stato legato S = (VLVL), formato dalla componente longitudinale fortemente interagente dei bosoni deboli di gauge V=W±, Z0, proposto da Veltman nel tentativo d’interpretare gli eventi anomali γγll osservati al collider SppS del CERN. Adottando il formalismo non relativistico dello stato legato si derivano gli accoppiamenti efflcaci di Sff, Sγγ e SγZ0 e si studia il decadimento del bosone S nei vari canali. S puÒ avere un accoppiamento forte efficace con un quark pesante SUŪ o con un leptone pesante SLL se esiste una coppia di quark pesanti (U, D) o una coppia di leptoni pesanti (ΝL, L) che soddisfano rispettivamente la relazione di massa m 2U - m 2D ≅ M 2W , o\(m_L^2 - m_{v_L }^2 \simeq M_W^2 \). Se quella relazione non vale S decadono prevalentemente nel canale γγ(Z0). Si stimano alcune sezioni d’urto di produzione per esperimenti futuri del collider.
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Hayashi, M., Yamagishi, K. Phenomenological consequences of a bound state of weak vector bosons. Nuov Cim A 95, 121–136 (1986). https://doi.org/10.1007/BF02903036
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DOI: https://doi.org/10.1007/BF02903036