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.
21st International Europhysics Conference on High Energy Physics, EPS-HEP 2011; Grenoble, RhoneAlpes; France; (21 July 2011 through 27 July 2011)


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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: