Its formula for the double-differential cross section with respect to momentum (p) and solid angle () is as follows.
Where p and are the momentum of the outgoing pion and its angle from the direction of the incident proton. The numbers are the Sanford-Wang parameters and are typically varied to give a good fit with experimental data.
- J. R. Sanford and C. L. Wang, Brookhaven National Laboratory, AGS internal report, 1967 (unpublished)
- Wang, C. L. (1970-10-12). "Pion, Kaon, and Antiproton Production Between 10 and 70 BeV". Physical Review Letters. American Physical Society (APS). 25 (15): 1068–1072. doi:10.1103/physrevlett.25.1068. ISSN 0031-9007.
- Wang, C. L. (1970-11-23). "Errata: Pion, Kaon, and Antiproton Production between 10 and 70 BeV". Physical Review Letters. American Physical Society (APS). 25 (21): 1536–1536. doi:10.1103/physrevlett.25.1536. ISSN 0031-9007.