Preskill, John and Weinberg, Steven (1981) "Decoupling" constraints on massless composite particles. Physical Review D, 24 (4). pp. 1059-1062. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:PREprd81
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It is pointed out that the use of the "decoupling" constraints on the spectrum of composite massless particles is not justified without further assumptions. There is an alternative condition, whose use would not be subject to the same criticisms, which would lead to the same constraints as the decoupling condition, and which would lead to other results as well, for instance that the nonchiral global symmetries in quantum chromodynamics (QCD) with n massless flavors can not be spontaneously broken. However, this condition is found to be violated in a specific model. It is still an open possibility that the chiral symmetries of QCD are unbroken for n not a multiple of 3.
|Additional Information:||©1981 The American Physical Society Received 5 January 1981 We are grateful to Itzhak Bars, Sidney Coleman, Estia Eichten, Howard Georgi, Bob Holdom, Roman Jackiw, Leonard Susskind, and Edward Witten for valuable discussions. Research of one of us (J.P.) was supposrted in part by the Harvard Society of Fellows.|
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|Deposited On:||20 Apr 2006|
|Last Modified:||26 Dec 2012 08:50|
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