Measurement of the differential cross section $d\sigma/dt$ in elastic $p\bar{p}$ scattering at $\sqrt{s}=1.96$ TeV

The D0 collaboration
Phys.Rev.D 86 (2012) 012009, 2012.

Abstract (data abstract)
FNAL-D0. We present a measurement of the elastic differential cross section $d\sigma(p\bar{p}\rightarrow p\bar{p})/dt$ as a function of the four-momentum-transfer squared $t$. The data sample corresponds to an integrated luminosity of ~ 31 nb$^{-1}$ collected with the D0 detector using dedicated Tevatron $p\bar{p} $ Collider operating conditions at $\sqrt s = 1.96$ TeV and covers the range $0.26 <|t|< 1.2$ GeV$^2$. For $|t|<0.6$ GeV$^2$, $d\sigma/dt$ is described by an exponential function of the form $Ae^{-b|t|}$ with a slope parameter $ b = 16.86 \pm 0.10({\rm stat}) \pm 0.20({\rm syst})$ GeV$^{-2}$. A change in slope is observed at $|t| \approx 0.6$ GeV$^2$, followed by a more gradual $|t|$ dependence with increasing values of $|t|$.

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