8 papers
Factorization of the triple-collinear splitting function at first order in opacity
Shahin Iqbal, Urs Achim Wiedemann
In strongly ordered collinear limits, triple-collinear splitting functions factorize into products of splitting functions. Here, we investigate whether, and under…
Extremely high-energy bremsstrahlung in matter
Peter Arnold, Joshua Bautista, Omar Elgedawy +1
The theory of bremsstrahlung by extremely high energy electrons passing through ordinary matter has been qualitatively incomplete. We revisit the suppression of bremsst…
Calculating extremely high energy bremsstrahlung in matter
Peter Arnold, Joshua Bautista, Omar Elgedawy +1
Ultra-relativistic electrons initiate electromagnetic showers in ordinary matter that evolve through bremsstrahlung and pair production. At very high energy, the quantum mechanical…
The LPM effect in sequential bremsstrahlung 2: factorization
Peter Arnold, Han-Chih Chang, Shahin Iqbal
The splitting processes of bremsstrahlung and pair production in a medium are coherent over large distances in the very high energy limit, which leads to a suppression known as the…
Revisiting extremely high energy QED bremsstrahlung in matter: large modifications to the LPM effect
Peter Arnold, Joshua Bautista, Omar Elgedawy +1
Very high energy electrons initiate electromagnetic showers in ordinary matter that branch and multiply through bremsstrahlung and pair production. At extremely high energies, the…
Are Parton Showers in a Quark-Gluon Plasma Strongly Coupled? A Theorist's Test
Peter Arnold, Omar Elgedawy, Shahin Iqbal
We study whether in-medium showers of high-energy quarks and gluons can be treated as a sequence of individual splitting processes or whether there is significant quantum overlap b…