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Anomalous pion decay in effective QCD at finite temperature
Blaschke, David; Jaminon, Martine; Kalinovsky, Yu. L. et al.
1995In Nuclear Physics A, 592, p. 561-580
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Abstract :
[en] The width of the process π0 → γγ is calculated within effective QCD at finite temperature. We use two different effective models which describe chiral symmetry breaking and its restoration at finite temperature in SU(2)ƒ: (i) an effective lagrangian with a nonlocal separable interaction kernel, (ii) A- and B-scaledNJL lagrangians which implement the scale anomaly of QCD. We calculate the temperature dependences of the quark and pion masses as well as of the pion-park-antiquark coupling strength below and above the double quark mass threshold. At zero temperature we obtain a fairly good agreement with the experimental value for the decay width. The temperature dependence of the decay width is related to that of the pion mass. Γπ0 → γγ is enhanced in the vicinity of the Mott temperature (Mπ = 2mq) for the nonlocal as well as for the A-scaled model and suppressed for the B-scaled model. We compare our results with the SU(2) Nambu-Jona-Lasinio model which is contained as a limiting case in our approach.
Disciplines :
Physics
Author, co-author :
Blaschke, David
Jaminon, Martine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Kalinovsky, Yu. L.
Petrow, P.
Schmidt, S.
Van den Bossche, Bruno
Language :
English
Title :
Anomalous pion decay in effective QCD at finite temperature
Publication date :
1995
Journal title :
Nuclear Physics A
ISSN :
0375-9474
eISSN :
1873-1554
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
592
Pages :
561-580
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 23 September 2009

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