Gemma experiment: The results of neutrino magnetic moment search

Beda, A. G.; Brudanin, V.; Egorov, V.; Medvedev, D. V.; Pogosov, V.S.; Shevchik, E.; Shirchenko, M.; Старостин, А. С.; Zhitnikov, I.

doi:10.1134/s1547477113020027

Cited by 161 publications

(146 citation statements)

References 20 publications

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“…Small electromagnetic couplings of neutrinos, e.g., magnetic moments, may have effects in the early universe, where neutrinos determine much of the energetics and composition (e.g., isospin). Examinations of the role that neutrino magnetic channels can play in astrophysics and cosmology began long before laboratory experiments, such as GEMMA [1], ever attempted to detect beyond-the-standard model magnetic moments. Any plasma environment in which neutrinos are produced in copious amounts, such as the Sun and supernovae, is susceptible to the possibility of small neutrino magnetic moments having observable consequences.…”

Section: Introductionmentioning

confidence: 99%

Majorana neutrino magnetic moment and neutrino decoupling in big bang nucleosynthesis

et al. 2015

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We examine the physics of the early universe when Majorana neutrinos (νe, νµ, ντ ) possess transition magnetic moments. These extra couplings beyond the usual weak interaction couplings alter the way neutrinos decouple from the plasma of electrons/positrons and photons. We calculate how transition magnetic moment couplings modify neutrino decoupling temperatures, and then use a full weak, strong, and electromagnetic reaction network to compute corresponding changes in Big Bang Nucleosynthesis abundance yields. We find that light element abundances and other cosmological parameters are sensitive to magnetic couplings on the order of 10 −10 µB. Given the recent analysis of sub-MeV Borexino data which constrains Majorana moments to the order of 10 −11 µB or less, we find that changes in cosmological parameters from magnetic contributions to neutrino decoupling temperatures are below the level of upcoming precision observations.

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Section: Introductionmentioning

confidence: 99%

Majorana neutrino magnetic moment and neutrino decoupling in big bang nucleosynthesis

et al. 2015

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“…The former produces an ER background of 0.10±0.01 events per 10000 kg-day. The neutrino ER background is dominated by pp solar neutrinos, and is estimated to be between 0.2 and 6.0 events per 10000 kg-day where the lower and upper values assume zero or the current experimental limit of the neutrino magnetic moment [16], respectively. The neutrino NR background was estimated to be 1×10 −3 events per 10000 kg-day.…”

mentioning

confidence: 99%

Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment

Tan¹,

Xiao²,

Cui³

et al. 2016

Phys. Rev. Lett.

600

697

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We report the WIMP dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing underground Laboratory. No dark matter candidate is identified above background. In combination with the data set during the commissioning run, with a total exposure of 3.3×10 4 kg-day, the most stringent limit to the spin-independent interaction between the ordinary and WIMP dark matter is set for a range of dark matter mass between 5 and 1000 GeV/c 2 . The best upper limit on the scattering cross section is found 2.5 × 10 −46 cm 2 for the WIMP mass 40 GeV/c 2 at 90% confidence level.Weakly interacting massive particles, WIMPs in short, are a class of hypothetical particles that came into existence shortly after the Big Bang. The WIMPs could naturally explain the astronomical and cosmological evidences of dark matter in the Universe. The weak interactions between WIMPs and ordinary matter could lead to the recoils of atomic nuclei that produce detectable signals in deep-underground direct detection experiments. Over the past decade, the dual-phase xenon time-projection chambers (TPC) emerged as a powerful technology for WIMP searches both in scaling up the target mass, as well as in improving background rejection [1][2][3]. LUX, a dark matter search experiment with a 250 kg liquid xenon target, has recently reported the best limit of 6×10 −46 cm 2 on the WIMP-nucleon scattering cross section [4] The PandaX-II experiment, a half-ton scale dual-phase xenon experiment at the China JinPing underground Laboratory (CJPL), has recently reported the dark matter search results from its commissioning run (Run 8,19.1 live days) with a 5845 kg-day exposure [5]. The data were contaminated with significant 85 Kr background. After a krypton distillation campaign in early 2016, PandaX-II commenced physics data taking in March 2016. In this paper, we report the combined WIMP search results using the data from the first physics run from March 9 to June 30, 2016 (Run 9, 79.6 live days) and Run 8, with a total of 3.3×10 4 kg-day exposure, the largest reported WIMP data set among dual-phase xenon detectors in the world to date.The PandaX-II detector has been described in detail in Ref. [5]. The liquid xenon target consists of a cylindrical TPC with dodecagonal cross section (opposite-side distance 646 mm), confined by the polytetrafluoroethylene (PTFE) reflective wall, and a vertical drift distance of 600 mm defined by the cathode mesh and gate grid located at the bottom and top. For each physical event, the prompt scintillation photons (S1) and the delayed electroluminescence photons (S2) from the ionized electrons are collected by two arrays of 55 Hamamatsu R11410-arXiv:1607.07400v3 [hep-ex] Hamamatsu R8520-406 1-inch PMTs serving as an active veto. The γ background, which produces electron recoil (ER) events, can be distinguished from the dark matter nuclear recoil (NR) using the S2-to-S1 ratio. During the data taking period in Run 9, a few diffe...

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“…This value is better that any other obtained at this energy scale. Furthermore, Phase A will provide significant information about neutrino magnetic moment [37] [38] and improve the best result obtained so far [39]. By combining Phase A and Phase C the vector (g V ) and axial (g A ) current coefficients of the low energy Fermi interaction can be measured.…”

Section: Sensitivity and Expected Resultsmentioning

confidence: 99%

Borex source experiment

Pallavicini¹

2014

Proceedings of XV International Workshop on Neutrino Telescopes — PoS(Neutel 2013)

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The unmatched radio-purity of its liquid scintillator and the large detector size make Borexino an ideal apparatus for the study of neutrino oscillations at very short distance and, particularly, for the search of sterile neutrinos of mass scale of the order of 1 eV. We present here three possible experiments with neutrino and anti-neutrino artificial sources located close to or inside the Borexino detector and discuss their sensitivity to sterile neutrinos. Expected sensitivities on electron neutrino magnetic moment, electroweak mixing angle, and couplings to axial and vector currents are shown as well.

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Gemma experiment: The results of neutrino magnetic moment search

Cited by 161 publications

References 20 publications

Majorana neutrino magnetic moment and neutrino decoupling in big bang nucleosynthesis

Majorana neutrino magnetic moment and neutrino decoupling in big bang nucleosynthesis

Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment

Borex source experiment

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