Global Conservation Laws and Femtoscopy of Small Systems

Abstract

It is increasingly important to understand, in detail, two-pion correlations measured in p+p and d+A collisions. In particular, one wishes to understand the femtoscopic correlations, in order to compare to similar measurements in heavy ion collisions. However, in the low-multiplicity final states of these systems, global conservation laws generate significant N-body correlations which project onto the two-pion space in non-trivial ways and complicate the femtoscopic analysis. We discuss a model-independent formalism to calculate and account for these correlations in measurements.

arXiv comment7 pages; 10 figures; Invited talk at the Second Workshop on Particle Correlations and Femtoscopy (WPCF06), Sept 9-11 2006, Sao Paulo, Brazil

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