2002/11/30 by Abhijit Bandyopadhyay, Sandhya Choubey, Sreetama Goswami +3
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #astro-ph #hep-ex #hep-ph
paper · pdf · doi:10.1088/0954-3899/29/11/002
published as J.Phys.G29:2465-2477,2003 · 16 pages, to appear in J Phys. G
arxiv created 2003/09/23 · openalex publication_date 2003/10/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper we investigate the potential of 1 and 3 kiloTon-years(kTy) of KamLAND data to further constrain the \Δ m2 and \tan2\θ values allowed by the post-SNO NC global solar data. We find that although an energy integrated oscillation to no oscillation event-rate ratio in the range \∼ 0.3-0.8 observed in KamLAND can provide support for the Large-Mixing Angle (LMA) solution, sensitive determination of the oscillation parameters will have to wait until the spectrum data is made available. We study the extent, dependence and characteristics of this sensitivity in and around the LMA region. Our analysis with 3 kTy simulated spectra shows that KamLAND spectrum data by itself can constrain \Δ m2 with a high precision if the simulation point lies around the LMA best-fit from global solar analysis. For spectra generated at lower values of \tan2\θ or higher values of \Δ m2, multiple regions become allowed indicating a significantly reduced reconstruction efficiency if the true spectrum corresponds to these choices. Combining the spectrum with global solar data tightens the constraints on allowed values of \tan2\θ and wipes away much of the high \Δ m2 and low \tan2\θ regions resulting in a high precision in determination of the oscillation parameters in almost all of the LMA region except that corresponding to values of \Δ m2 gsim 2 \× 10-4 eV2. We show that the incorporation of the CHOOZ data in the analysis reduces the size of the high \Δ m2 regions to some extent.