Neutrinoless double-beta decay with Majoron emission

Doi, Masaru; Kotani, Tsuneyuki; Takasugi, Eiichi

doi:10.1103/physrevd.37.2575

Cited by 38 publications

(34 citation statements)

References 20 publications

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“…This limit is almost a factor of 2 more stringent than the previous best limit for this isotope [30]. Taking into account the phase space factors given in [31] and the NME calculated in [16][17][18][19][20], an upper bound on the Majoron-neutrino coupling constant is obtained, hg ee i < ð1.6-3.0Þ × 10 −5 . The limits on lepton number violating parameters obtained here have comparable sensitivity to the best current results obtained with other isotopes, as shown in Table X and in Fig.…”

Section: Search For Neutrinoless Double-β Decaymentioning

confidence: 99%

Results of the search for neutrinoless double-βdecay inMo100with the NEMO-3 experiment

Arnold¹,

Augier²,

Baker³

et al. 2015

Phys. Rev. D

132

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The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double-β (0νββ) decay. We report the final results of a search for 0νββ decays with 6.914 kg of 100 Mo using the entire NEMO-3 data set with a detector live time of 4.96 yr, which corresponds to an exposure of 34.3 kg · yr. We perform a detailed study of the expected background in the 0νββ signal region and find no evidence of 0νββ decays in the data. The level of observed background in the 0νββ signal region [2.8-3.2] MeV is 0.44 AE 0.13 counts=yr=kg, and no events are observed in the interval [3.2-10] MeV. We therefore derive a lower limit on the half-life of 0νββ decays in 100 Mo of * Deceased PHYSICAL REVIEW D 92, 072011 (2015) 1550-7998=2015=92 (7)=072011 (23) 072011-1 © 2015 American Physical Society T 1=2 ð0νββÞ > 1.1 × 10 24 yr at the 90% confidence level, under the hypothesis of decay kinematics similar to that for light Majorana neutrino exchange. Depending on the model used for calculating nuclear matrix elements, the limit for the effective Majorana neutrino mass lies in the range hm ν i < 0.33-0.62 eV. We also report constraints on other lepton-number violating mechanisms for 0νββ decays.

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Section: Search For Neutrinoless Double-β Decaymentioning

confidence: 99%

Results of the search for neutrinoless double-βdecay inMo100with the NEMO-3 experiment

Arnold¹,

Augier²,

Baker³

et al. 2015

Phys. Rev. D

132

View full text Add to dashboard Cite

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“…happens to be same nucleon recoil operator as appears in Doi et al, [5], except for the sign of the second term. (We believe the sign difference is due to an error in ref.…”

mentioning

confidence: 91%

“…The most promising processes of this type are the lepton-number violating neutrinoless decay (ββ 0ν ), and the decay ββ M , in which the two outgoing electrons are accompanied by a Nambu-Golstone boson, called the majoron. Both processes were predicted [4,5] by the model introduced by Gelmini and Roncadelli [6]. While this simple and elegant model stimulated many experimental searches, it was subsequently found to be incompatible with the LEP measurement of the invisible width of the Z boson [7,8].…”

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confidence: 99%

“…(8) is the most important. Within the approximation where the momenta of electrons and majoron are neglected in comparison with those of the nucleon, and because the main contribution involves the spin singlet state of two nucleons, this term gives [5,16] …”

mentioning

confidence: 99%

“…(We believe the sign difference is due to an error in ref. [5].) It is possible to simplify the above expressions for the matrix element.…”

mentioning

confidence: 99%

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