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The SanfordWang parameterisation is a an empirical formula used to model the production of [[pions]] in nuclear interaction of the form p+A→<math>\pi^+</math>+X where a beam of highenergy [[protons]] hit a material.
Its formula for the doubledifferential [[Cross section (physics)cross
<math>\frac{d^2\sigma(p+A\rightarrow \pi^+ + X)}{dpd\Omega}(p,\theta) = </math>
<math>c_1 p^{c_2} \left(1\frac{p}{p_{beam}}\right)\exp\left[c_3\frac{p^{c_4}}{p_{beam}^{c_5}}c_6\theta(pc_7 p_{beam} (\cos\theta)^{c_8})\right]</math>
Where p and <math>\theta</math> are the momentum of the outgoing pion and its angle from the direction of the incident proton. The numbers <math>c_1\ldots c_8</math> are the ''SanfordWang parameters'' and are typically varied to give a good fit with experimental data.
== References ==
* J. R. Sanford and C. L. Wang,
(unpublished); C. L. Wang, Phys. Rev. Letters '''25''', 1068 (1970); ibid. '''25''', 1536(E) (1970).
[[Category:Particle Physics]]

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