Probing new physics in the neutrinoless double beta decay using electron angular correlation

Ali, A.; Borisov, A.V.; Zhuridov, D.V.

Авторы: Ali A., Borisov A.V., Zhuridov D.V.
Журнал: Physical Review D
Том: 76
Номер: 093009
Год издания: 2007
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 093009-1
Последняя страница: 093009-25
DOI: 10.1103/PhysRevD.76.093009
Аннотация: The angular correlation of the electrons emitted in the neutrinoless double beta decay ($0\nu2\beta$) is presented using a general Lorentz invariant effective Lagrangian for the leptonic and hadronic charged weak currents. We show that the coefficient $K$ in the angular correlation $d\Gamma/d\cos \theta \propto (1-K\cos \theta)$ is essentially independent of the nuclear matrix element models and present its numerical values for the five nuclei of interest ($^{76}\mbox{Ge}$, $^{82}\mbox{Se}$, $^{100}\mbox{Mo}$, $^{130}\mbox{Te}$, and $^{136}\mbox{Xe}$), assuming that the $0\nu2\beta$-decays in these nuclei are induced solely by a light Majorana neutrino, $\nu_M$. This coefficient varies between $K=0.82$ (for the $^{76}\mbox{Ge}$ nucleus) and $K=0.88$ (for the $^{82}\mbox{Se}$ and $^{100}\mbox{Mo}$ nuclei), calculated taking into account the effects from the nucleon recoil, the $S$ and $P$-waves for the outgoing electrons and the electron mass. Deviation of $K$ from its values derived here would indicate the presence of New Physics (NP) in addition to a light Majorana neutrino, and we work out the angular coefficients in several $\nu_M + \mbox{NP}$ scenarios for the $^{76}\mbox{Ge}$ nucleus. As an illustration of the correlations among the $0\nu2\beta$ observables (half-life $T_{1/2}$, the coefficient $K$, and the effective Majorana neutrino mass $|\langle m\rangle|$) and the parameters of the underlying NP model, we analyze the left-right symmetric models, taking into account current phenomenological bounds on the right-handed $W_R$-boson mass and the left-right mixing parameter $\zeta$.
Добавил в систему: Борисов Анатолий Викторович

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№	Имя	Описание	Имя файла	Размер	Добавлен
1.	Полный текст		ABZh_PRD_76_093009_2007.pdf	1,5 МБ	28 июня 2012 [borisov@phys.msu.ru]
2.	Полный текст		0706.4165.pdf	1,6 МБ	28 июня 2012 [borisov@phys.msu.ru]

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Probing new physics in the neutrinoless double beta decay using electron angular correlationстатья

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