I answer a question that Roman Jackiw asked me, and I draw some lessons from the answer. The question is: why is the Sudakov form factor larger by a factor of two, if computed for off-shell fermions, in comparison to the onshell case? The answer sheds some light on the interplay between infrared and collinear singularities — and the importance of factors of two.
On the Sudakov Form Factor, and a Factor of Two / S. Forte - In: Roman Jackiw : 80th Birthday Festschrift / [a cura di] A. Niemi, T. Tomboulis, K. Khoo Phua. - [s.l] : World Scientific, 2020. - ISBN 9789811210662. - pp. 149-163 [10.1142/9789811210679_0016]
On the Sudakov Form Factor, and a Factor of Two
S. Forte
2020
Abstract
I answer a question that Roman Jackiw asked me, and I draw some lessons from the answer. The question is: why is the Sudakov form factor larger by a factor of two, if computed for off-shell fermions, in comparison to the onshell case? The answer sheds some light on the interplay between infrared and collinear singularities — and the importance of factors of two.
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