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In this note we describe hadrons: mesons and baryons as strings with electriccharges on their endpoints. We consider here only the neutral system withopposite charges coupled to an external constant electric and magnetic fields.We derive certain classical solutions including rotating folded open strings.We write down the mode expansion and canonically quantize the system. The OPEsassociated with such strings are determined. We re-derive the non-commutativityof the zero modes and the fact that the charges modify the spacetime metric. Weshow that the quantum worldsheet energy momentum tensor on the boundary isaffected by the endpoint charges and differs from the corresponding Noethercurrent. We determine the generalization of the Veneziano scattering amplitudefor such strings in the critical dimension. Phenomenological implications areaddressed and in particular we show that the external magnetic field can betuned so that the amplitude vanishes for particular kinematic setups. Wediscuss the generalization of such strings to non-critical four dimensionalspacetime. In particular we renormalize the divergence of thePolchinski-Strominger effective action associated with the rotating foldedstring.

The scattering amplitude of stringy hadrons I: Strings with opposite charges on their endpoints