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Measurement of the θ13 Neutrino Mixing Angle at Daya Bay via Neutron Capture on Hydrogen
No full textNeutrinos exhibit a unique behavior compared to other Standard Model particles: neutrino oscillations. This phenomenon is the periodic change of probability to interact with certain lepton flavors as they propagate. Measuring the oscillation parameters accurately is crucial to exploring the unanswered questions related to neutrino physics, most notably the possibility that these particles violate the CP symmetry or that there are more than three generations of them.The Daya Bay Reactor Neutrino Experiment is known for making the first unambiguous determination of the non-zero value of the θ13 mixing angle and producing the most precise measurements of this parameter ever since. Located in Southern China, Daya Bay utilizes eight strategically placed identically-designed detectors to measure the disappearance ofelectron antineutrinos from six nuclear reactor cores. The antineutrino interactions are identified through the double coincidence signature of the inverse beta decay. The neutron from this interaction can get captured on a nucleus of either gadolinium (nGd) or hydrogen (nH). Given that the statistical samples are entirely separate and the systematics largely decoupled, the nH and nGd measurements are virtually independent of one another. This makes the nH analysis valuable as a precise cross-check to the nGd analysis.Daya Bay’s world-leading measurement of θ13 is the result of analyzing the former. The measurement of the latter sample is presented in this thesis, including the event selection, removal of background events, evaluation of the systematic uncertainties, and fitting procedure, ultimately leading to the best fit results of sin2 2θ13 = 0.0776 ± 0.0053 and∆m2 ee = (2.80 ± 0.14) × 10−3 eV2. This measurement is among the second most precise measurements of θ13 globally
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Latest Results from Daya Bay
No full textThe Daya Bay Reactor Neutrino Experiment has been collecting data since late 2011 and has already accumulated the largest sample of reactor antineutrinos to date. The experiment's unique configuration of eight identically designed detectors placed underground at different baselines from six 2.9 GWth nuclear reactors allows it to study a wide range of topics of interest in neutrino physics. In this talk I will review the latest results from Daya Bay on different fronts, with a focus on the most recent measurement of the oscillation parameters that drive the disappearance of electron antineutrinos at short baselines
A Search for Muon Neutrino to Electron Neutrino Oscillations in the MINOS Experiment
No full textWe perform a search for muon neutrino to electron neutrino oscillations, a process which would manifest a nonzero value of the theta-13 mixing angle, in the MINOS long-baseline neutrino oscillation experiment. The analysis consists of searching for an excess of electron neutrino charged-current candidate events over the predicted backgrounds, made mostly of neutral-current events with high electromagnetic content. A novel technique to select electron neutrino events is developed, which achieves an improved separation between the signal and the backgrounds, and which consequently yields a better reach in theta-13. The backgrounds are predicted in the Far Detector from Near Detector measurements. An excess is observed in the Far Detector data over the predicted backgrounds, which is consistent with the background-only hypothesis at 1.2 standard deviations
Latest Results from Daya Bay
No full textThe Daya Bay Reactor Neutrino Experiment has been collecting data since late 2011 and has already accumulated the largest sample of reactor antineutrinos to date. The experiment's unique configuration of eight identically designed detectors placed underground at different baselines from six 2.9 GWth nuclear reactors allows it to study a wide range of topics of interest in neutrino physics. In this talk I will review the latest results from Daya Bay on different fronts, with a focus on the most recent measurement of the oscillation parameters that drive the disappearance of electron antineutrinos at short baselines
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