Understanding the Forward Muon Deficit in Coherent Pion Production

Details Understanding the Forward Muon Deficit in Coherent Pion Production Understanding the Forward Muon Deficit in Coherent Pion Production

2007-09-27

arxiv.org/abs/0709.4450v1

AIPConf.Proc.967:166-168,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 2 figures, presented at NuInt07, Fermilab, may 31 - june 3 2007

Scientific paper

10.1063/1.2834469

For any inelastic process $v_{\ell} + I \to \ell^- + F$ with $m_{\ell} = 0$,
the cross section at $\theta_{\ell} = 0$ is given by Adler's PCAC theorem.
Inclusion of the lepton mass has a dynamical effect (``PCAC-screening'') caused
by interference of spin-zero ($\pi^+$) and spin-one exchanges. This effect may
be relevant to the forward suppression reported in recent experiments.

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