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The longitudinal asymmetry in relativistic heavy ion collisions arises fromthe fluctuation in the number of nucleons involved. This asymmetry causes arapidity shift in the center of mass of the participating zone. Both therapidity shift and the longitudinal asymmetry have been found to be significantat the top CERN Large Hadron Collider (LHC) energy for collisions of identicalnuclei, and the longitudinal asymmetry is important for reconstructing thecolliding vertex and correcting the rapidity shift. However, much discussion ofthe longitudinal asymmetry has treated the initial condition as a nonzeromomentum contributed only by the number of participants, i.e., the asymmetrydepends only on the number of participating nucleons. So we naturally raise aphysical problem, can other initial conditions, such as two typical initialconditions for nuclei, geometric configuration, and momentum distribution,provide effects on the longitudinal asymmetry? Therefore, in this work weconsider other effects on the longitudinal asymmetry other than the fluctuationin the number of participants, e.g., the {\alpha} clustering structure as wellas the intrinsic momentum distribution in the target and projectile nuclei forthe collisions in the framework of a multiphase transport (AMPT) model. Byintroducing systems with different {\alpha}-clustering structure and intrinsicmomentum distribution, we calculated the ratio of the rapidity distributions ofdifferent systems and extracted expansion coefficients to analyze thedifference contributed by these factors. ...

physical review. c

Effects of the $\alpha$-cluster structure and the intrinsic momentum  component of nuclei on the longitudinal asymmetry in relativistic heavy-ion  collisions