2 research outputs found

    The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment

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    The Majorana Demonstrator will search for the neutrinoless double-beta <math id="M1" xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">(</mo><mi>β</mi><mi>β</mi><mfenced separators="|"><mrow><mn>0</mn><mi>ν</mi></mrow></mfenced><mo stretchy="false">)</mo></math> decay of the isotope <math id="M2" xmlns="http://www.w3.org/1998/Math/MathML"/> Ge with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate that the neutrino is its own antiparticle, demonstrate that lepton number is not conserved, and provide information on the absolute mass scale of the neutrino. The Demonstrator is being assembled at the 4850-foot level of the Sanford Underground Research Facility in Lead, South Dakota. The array will be situated in a low-background environment and surrounded by passive and active shielding. Here we describe the science goals of the Demonstrator and the details of its design

    Measurement of branching fractions for B J / K decays and search for a narrow resonance in the J / final state

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    We report an observation of the and decays using pairs collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. We obtain the branching fractions and . We search for a new narrow charmonium(-like) state in the mass spectrum and find no significant excess. We set upper limits on the product of branching fractions, , at where a -odd partner of may exist, at and assuming their known mass and width, and over a range from 3.8 to . The obtained upper limits at 90 confidence level for , , and are , , and , respectively
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