Chinese Physics C > 2015, Vol. 39 > Issue(1): 011001 DOI: 10.1088/1674-1137/39/1/011001

Geometry of the effective Majorana neutrino mass in the 0νββ decay

XING Zhi-Zhong^1,2,,,
ZHOU Ye-Ling^1,,

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Abstract：
The neutrinoless double-beta (0 νββ) decay is a unique process used to identify the Majorana nature of massive neutrinos, and its rate depends on the size of the effective Majorana neutrino mass < m> _ee. We put forward a novel ‘coupling-rod’ diagram to describe < m> _eein the complex plane, by which the effects of the neutrino mass ordering and CP-violating phases on < m> _eeare intuitively understood. We show that this geometric language allows us to easily obtain the maximum and minimum of |< m> _ee|. It remains usable even if there is a kind of new physics contributing to < m> _ee, and it can also be extended to describe the effective Majorana masses < m> _eμ, < m> _eτ, < m> _μμ, < m> _μτand < m> _ττwhich may appear in some other lepton-number violating processes.

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XING Zhi-Zhong and ZHOU Ye-Ling. Geometry of the effective Majorana neutrino mass in the 0 νββ decay[J]. Chinese Physics C, 2015, 39(1): 011001. doi: 10.1088/1674-1137/39/1/011001

XING Zhi-Zhong and ZHOU Ye-Ling. Geometry of the effective Majorana neutrino mass in the 0 νββ decay[J]. Chinese Physics C, 2015, 39(1): 011001. doi:10.1088/1674-1137/39/1/011001 shu

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Received: 2014-06-03
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Geometry of the effective Majorana neutrino mass in the 0νββ decay

XING Zhi-Zhong^1,2,,
ZHOU Ye-Ling^1,,

Corresponding author:XING Zhi-Zhong,

Corresponding author:ZHOU Ye-Ling,

Received Date:2014-06-03
Accepted Date:1900-01-01
Available Online:2015-01-05

Abstract:The neutrinoless double-beta (0νββ) decay is a unique process used to identify the Majorana nature of massive neutrinos, and its rate depends on the size of the effective Majorana neutrino mass <m>_ee. We put forward a novel ‘coupling-rod’ diagram to describe <m>_eein the complex plane, by which the effects of the neutrino mass ordering and CP-violating phases on <m>_eeare intuitively understood. We show that this geometric language allows us to easily obtain the maximum and minimum of |<m>_ee|. It remains usable even if there is a kind of new physics contributing to <m>_ee, and it can also be extended to describe the effective Majorana masses <m>_eμ, <m>_eτ, <m>_μμ, <m>_μτand <m>_ττwhich may appear in some other lepton-number violating processes.