The LPM effect in sequential bremsstrahlung: 4-gluon vertices

Journal Article · 01 October 2016 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP10(2016)124 · OSTI ID:1425922

Arnold, Peter ^[1]; Chang, Han-Chih ^[1]; Iqbal, Shahin ^[2]

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1. Univ. of Virginia, Charlottesville, VA (United States)
2. Quaid-i-Asam Univ. Campus, Islamabad (Pakistan)

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 Landau-Pomeranchuk-Migdal (LPM) effect. In this paper, we continue study of the case when the coherence lengths of two consecutive splitting processes overlap (which is important for understanding corrections to standard treatments of the LPM effect in QCD), avoiding soft-gluon approximations. In particular, this paper completes the calculation of the rate for real double gluon bremsstrahlung from an initial gluon with various simplifying assumptions (thick media; qˆ approximation; and large N_c) by now including processes involving 4-gluon vertices.

• Research Organization: Univ. of Virginia, Charlottesville, VA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0007984
• OSTI ID: 1425922
• Journal Information: Journal of High Energy Physics (Online), Vol. 2016, Issue 10; ISSN 1029-8479
• Publisher: Springer BerlinCopyright Statement
• Country of Publication: United States
• Language: English