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Torres Andrés, R. and Gómez Nicola, Ángel (2012) Scalar susceptibilities and electromagnetic thermal mass differences in chiral perturbation theory. Progress in particle and nuclear physics, 67 (2). pp. 337342. ISSN 01466410

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Official URL: http://dx.doi.org/10.1016/j.ppnp.2011.12.040
URL  URL Type 

http://www.sciencedirect.com  Publisher 
http://arxiv.org/abs/1111.5292  Organisation 
Abstract
We make a thermal analysis of the light scalar susceptibilities using SU(3)chiral perturbation theory to oneloop order, taking into account the QCD source of isospin breaking (IB), i.e. corrections coming from m(u) not equal m(d). The value of the connected scalar susceptibility in the infrared regime, the one relevant when approaching chiral symmetry restoration, and below the critical temperature is found to be entirely dominated by the pi(0)eta mixing, which leads to modelindependent O(epsilon(0)) corrections, where epsilon similar to m(d)  m(u), in the combination chi(uu)  chi(ud) of flavour breaking susceptibilities. We also present preliminary results for the corrections to the real part of the pion selfenergy at nexttoleading order in SU(2)chiral perturbation theory, taking into account electromagnetic interaction. The results for zero and finite temperature for the charged and neutral pions are given in terms of the 3momentum of the external pion, and their difference is calculated to this order, stressing the fact that, at low and moderate temperature, the mass splitting Mpi +/  Mpi 0 grows with temperature for, at least, nonzero charged pion mass running inside the loops.
Item Type:  Article 

Additional Information:  © Elsevier Science BV. 
Uncontrolled Keywords:  Chiral symmetry; Chiral perturbation theory; Isospin breaking; Finitetemperature field theory 
Subjects:  Sciences > Physics > PhysicsMathematical models Sciences > Physics > Mathematical physics 
ID Code:  30154 
Deposited On:  20 May 2015 09:48 
Last Modified:  10 Dec 2018 15:09 
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