Nath, Atanu
(2016)
Rare Kaon Decays: Matching Long And Short Distance Physics In K  > Pi e+ e.
[Tesi di dottorato]
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Item Type: 
Tesi di dottorato

Resource language: 
English 
Title: 
Rare Kaon Decays: Matching Long And Short Distance Physics In K  > Pi e+ e 
Creators: 
Creators  Email 

Nath, Atanu  atanu.nath@fisica.unina.it 

Date: 
16 March 2016 
Number of Pages: 
154 
Institution: 
Università degli Studi di Napoli Federico II 
Department: 
Fisica 
Scuola di dottorato: 
Scienze fisiche 
Dottorato: 
Fisica fondamentale ed applicata 
Ciclo di dottorato: 
28 
Coordinatore del Corso di dottorato: 
nome  email 

Velotta, Raffaele  velotta@na.infn.it 

Tutor: 
nome  email 

D'Ambrosio, Giancarlo  UNSPECIFIED 

Date: 
16 March 2016 
Number of Pages: 
154 
Keywords: 
radiative kaon decays, chiral perturbation theory, large N, QCD, weak chiral lagrangian, OPE, longshort matching, hidden local symmetry, vector mesons 
Settori scientificodisciplinari del MIUR: 
Area 02  Scienze fisiche > FIS/02  Fisica teorica, modelli e metodi matematici Area 02  Scienze fisiche > FIS/04  Fisica nucleare e subnucleare 
Date Deposited: 
14 Apr 2016 20:49 
Last Modified: 
31 Oct 2016 09:48 
URI: 
http://www.fedoa.unina.it/id/eprint/10691 
Collection description
In this thesis we try to understand the nonperturbative regime of QCD through long and short distance matching of the decay amplitude K>pi e^+ e^. The first Chapter contains brief introduction and motivation then in the end we introduce the notations and transformation properties of various quantities and tables of phenomenological parameters. In the second chapter we discuss the Chiral Symmetry and its breaking and the construction of Delta S = 0,1 Lagrangians. Then we apply chiral Lagrangian to calculate the amplitude of K^+ > pi^+ pi^ decay at one loop in section of the second chapter, the approach is a little bit different than that of Ecker, Pick and Raffael but a few tricks introduced by them were used. In section 2.7.3 we introduce the beyond leading order dispersive calculation of the same decay by D'Ambrosio et al. where the phenomenological parameters a_i and b_i (that completely fixes the form factor of the decay under study) were introduced and were predicted in the last chapter. In chapter 3 we start with a brief discussion of long and short distance matching of QCD and the calculation of Wilson coefficients. Then we introduce in reasonable detail the Bardeen, Buras and G`erard (BBG) scheme of matching which plays the central role in our work. In the last chapter we apply BBG scheme to calculate the form factor of the deacy K > pi e^+ e^, first in section 4.0.6 without vector meson resonances and find values which are extremely small compared to the experimental values then in section 4.1 we introduce the resonances through Hidden Local Symmetry (HLS) and construct the weak chiral Lagrangian containing vector coupling based on the GilmanWise Delta S = 1 Hamiltonian, we then use it to calculate the appropriate extension of the BBG long distane evolution operator introduced in chapter 3 and calculate the a_i and b_i parameters. Vector inclusion shows huge enhancements in both parameters. We provide detailed evaluations of the loop integrals in Appendix B, Feynman rules and other conventions are presented in Appendix A and in Appendix C we present the large N structure of relevant Wilson coefficients. Notations, symbols and transformation properties of quantities along with various phenomenological parameters and their values are provided in the end of the introductory chapter.
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