Measurement of v̄e-e- scattering cross-section and constraints on new physics with a CsI(TI) crystal array at the Kuo-Sheng reactor laboratory

Deniz, Muhammed
Bilmiş, Selçuk
Wong, Henry T.
The v̄e-e- elastic scattering cross-section was measured with a CsI(Tl) scintillating crystal detector array with a total mass of 187 kg at the Kuo-Sheng Nuclear Power Station. The detectors were exposed to a reactor v̄e flux of 6.4 × 1012 cm-2s-1 originated from a core with 2.9 GW thermal power. The physics motivations, conceptual design, detector hardware, data analysis and background understanding of the experiment are presented. Using 29882/7369 kg-days of Reactor ON/OFF data, the Standard Model (SM) of electroweak interaction was probed at the 4-momentum transfer range of ∼ 3 × 10-6 GeV2. A crosssection ratio of Rexpt = [1.08±0.21 (stat) ±0.16 (sys)] × RSM was measured. Constraints on the electroweak parameters (gV,gA) were placed, corresponding to a weak mixing angle measurement of sin2θW = 0.251 ±0.031 (stat) ±0.024 (sys). The destructive interference in the SM V̄e-e processes was verified with the value of RINTezpt =-0.92 ±0.30 (stat) ±0.24 (sys). Bounds on neutrino anomalous electromagnetic properties were placed: neutrino magnetic moment at μv̄e < 2.2 × 10-1μb at 90% confidence level, and the neutrino charge radius at (r2v̄e) = [0.61 ± 1.30 (stat) ± 1.01 (sys)] × 10-32 cm2. Since Neutrino-electron scattering are purely leptonic processes with robust Standard Model (SM) predictions, their measurements can provide constraints to physics beyond SM. The ve - e- data taken at the Kuo-Sheng Reactor Neutrino Laboratory were used to probe two scenarios: Non-Standard Neutrino Interactions (NSI) and Unparticle Physics. New constraints were placed to the NSI parameters (ϵeLee ϵeRee), (ϵeLeμ, ϵeReμ) and (ϵeLeτ, ϵeReτ) for the Non-Universal and Flavor-Changing channels, respectively, as well as to the coupling constants for scalar (λ0) and vector (λ1) unparticles to the neutrinos and electrons.


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Citation Formats
M. Deniz, S. Bilmiş, and H. T. Wong, “Measurement of v̄e-e- scattering cross-section and constraints on new physics with a CsI(TI) crystal array at the Kuo-Sheng reactor laboratory,” presented at the 21st International Europhysics Conference on High Energy Physics, EPS-HEP 2011; Grenoble, RhoneAlpes; France; (21 July 2011 through 27 July 2011), Grenoble, RhoneAlpes; France, 2011, Accessed: 00, 2021. [Online]. Available: