The LPM effect in sequential bremsstrahlung: 4-gluon vertices

Journal Article · Sat Oct 01 00:00:00 EDT 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 ^[2]; Iqbal, Shahin ^[3]

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1. Univ. of Virginia, Charlottesville, VA (United States); University of Virginia, Charlottesville, Virginia
2. Univ. of Virginia, Charlottesville, VA (United States)
3. 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
• Alternate ID(s): OSTI ID: 22610589
• Journal Information: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 10 Vol. 2016; ISSN 1029-8479
• Publisher: Springer Berlin
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS