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To reconstruct the Mandelstam variable t, which represents the momentum transfer to the proton in exclusive reactions, it is critical to detect the forward going scattered proton.  
 
To reconstruct the Mandelstam variable t, which represents the momentum transfer to the proton in exclusive reactions, it is critical to detect the forward going scattered proton.  
t is essential in exclusive reactions as it can be fourier transformed to the impact parameter b, which gives the transverse spatial distribution of partons in the proton.  
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t is essential in exclusive reactions as it can be fourier transformed to the impact parameter b, which gives the transverse spatial distribution of partons in the proton. t is for exclusive reaction pt^2 of the proton.
 
The figure below shows the scattering angle θ for three different center-of-mass energies as a function of the scattered proton momentum.
 
The figure below shows the scattering angle θ for three different center-of-mass energies as a function of the scattered proton momentum.
 
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