The study of the 4\documentclass[12pt]{minimal}
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\begin{document}$$\mathbf{4}$$\end{document}-tachyon off-shell string scattering amplitude A4(s,t,u)\documentclass[12pt]{minimal}
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\begin{document}$$ A_4 (s, t, u) $$\end{document}, based on Witten’s open string field theory, reveals the existence of poles in the s-channel and associated to a continuum of complex “spins” J. The latter J belong to the Regge trajectories in the t, u channels which are defined by -J(t)=-1-12t=β(t)=12+iλ\documentclass[12pt]{minimal}
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\begin{document}$$ - J (t) = - 1 - { 1\over 2 } t = \beta (t)= { 1\over 2 } + i \lambda $$\end{document}; -J(u)=-1-12u=γ(u)=12-iλ\documentclass[12pt]{minimal}
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\begin{document}$$ - J (u) = - 1 - { 1\over 2 } u = \gamma (u) = { 1\over 2 } - i \lambda $$\end{document}, with λ=real\documentclass[12pt]{minimal}
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\begin{document}$$ \lambda = real$$\end{document}. These values of β(t),γ(u)\documentclass[12pt]{minimal}
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\begin{document}$$ \beta ( t ), \gamma (u) $$\end{document} given by 12±iλ\documentclass[12pt]{minimal}
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\begin{document}$${ 1\over 2 } \pm i \lambda $$\end{document}, respectively, coincide precisely with the location of the critical line of nontrivial Riemann zeta zeros ζ(zn=12±iλn)=0\documentclass[12pt]{minimal}
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\begin{document}$$ \zeta (z_n = { 1\over 2 } \pm i \lambda _n) = 0$$\end{document}. It is argued that despite assigning angular momentum (spin) values J to the off-shell mass values of the external off-shell tachyons along their Regge trajectories is not physically meaningful, their net zero-spin value J(k1)+J(k2)=J(k3)+J(k4)=0\documentclass[12pt]{minimal}
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\begin{document}$$ J ( k_1 ) + J (k_2) = J ( k_3 ) + J ( k_4 ) = 0$$\end{document} is physically meaningful because the on-shell tachyon exchanged in the s-channel has a physically well defined zero-spin. We proceed to prove that if there were nontrivial zeta zeros (violating the Riemann Hypothesis) outside the critical line Realz=1/2\documentclass[12pt]{minimal}
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\begin{document}$$ Real~ z = 1/2 $$\end{document} (but inside the critical strip) these putative zeros don′t\documentclass[12pt]{minimal}
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\begin{document}$$ don't$$\end{document} correspond to any poles of the 4\documentclass[12pt]{minimal}
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\begin{document}$$\mathbf{4}$$\end{document}-tachyon off-shell string scattering amplitude A4(s,t,u)\documentclass[12pt]{minimal}
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\begin{document}$$ A_4 (s, t, u) $$\end{document}. We finalize with some concluding remarks on the zeros of sinh(z) given by z=0+i2πn\documentclass[12pt]{minimal}
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\begin{document}$$ z = 0 + i 2 \pi n$$\end{document}, continuous spins, non-commutative geometry and other relevant topics.
