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1. |
Record Nr. |
UNISA996418165403316 |
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Autore |
Nakagiri Kota |
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Titolo |
Search for the Decay K_L → π^0\nu\bar{\nu} at the J-PARC KOTO Experiment [[electronic resource] /] / by Kota Nakagiri |
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Pubbl/distr/stampa |
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Singapore : , : Springer Singapore : , : Imprint : Springer, , 2020 |
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ISBN |
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Edizione |
[1st ed. 2020.] |
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Descrizione fisica |
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1 online resource (XVI, 151 p. 121 illus., 109 illus. in color.) |
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Collana |
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Springer Theses, Recognizing Outstanding Ph.D. Research, , 2190-5053 |
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Disciplina |
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Soggetti |
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Nuclear physics |
Heavy ions |
Particle acceleration |
Elementary particles (Physics) |
Quantum field theory |
Nuclear Physics, Heavy Ions, Hadrons |
Particle Acceleration and Detection, Beam Physics |
Elementary Particles, Quantum Field Theory |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di contenuto |
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Introduction -- The KOTO Experiment -- Data Taking -- Event Reconstruction -- Monte Carlo Simulation -- Analysis of the KL →π0νν and KL →π0X0 Searches -- Discussion -- Conclusion -- Appendix. |
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Sommario/riassunto |
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This book reports on a new result from the KL→π0νν search at the J-PARC KOTO experiment, which sets an upper limit of 3×10-9 for the branching fraction of the decay at the 90% confidence level, improving the previous best limit by an order of magnitude. To explain the matter–antimatter asymmetry in the universe, still unknown new physics beyond the standard model (SM) that breaks CP symmetry is necessary. The rare decay of a long-lived neutral K meson, KL→π0νν, is a CP-violating decay. It is an excellent probe to search for new physics because new physics can contribute to the decay and change its branching fraction, while the SM is as small as 3×10-11. However, it is extremely difficult to search for because all of the decay products are neutral and two neutrinos are undetectable. The KL→π0νν signal is |
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identified by measuring two photons from a π0 with a calorimeter and confirming the absence of any other detectable particles with hermetic veto counters. The book contributes to the analysis of neutron-induced backgrounds which were the dominant background sources in the search. For the background caused by two consecutive hadronic showers in the calorimeter due to a neutron, the author evaluated the background yield using a data-driven approach. For another background caused by an η meson production—η decays two photons—by a neutron that hits a veto counter near the calorimeter, the author developed an original analysis technique to reduce it. The book also contributes to the analysis of the normalization modes (KL→3π0, KL→2π0, KL→2γ) to measure KL yield, the estimation of the signal acceptance based on a simulation, and the evaluation of the trigger efficiency. As a result, significant improvements in the measurement were achieved, and this is an important step in the continuing higher sensitivity search, which can reach new physics with the energy scales up to O(100-1000 TeV). |
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2. |
Record Nr. |
UNINA9910165069203321 |
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Autore |
Fardig Caroline |
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Titolo |
Mug Shot |
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Pubbl/distr/stampa |
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ISBN |
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Lingua di pubblicazione |
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Formato |
Musica |
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Livello bibliografico |
Monografia |
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Sommario/riassunto |
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Former musician Juliet Langley has barely had a day off since taking over management of the coffeehouse owned by her best friend, Pete Bennett. But there's always more to be done-such as prepping for the annual Holiday 5K Race organized by Pete's snobby socialite girlfriend, Cecilia Hollingsworth. This year, Java Jive has a booth right at the finish |
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line, and since Juliet and Cecilia don't always see eye to eye, everything has to be perfect. Nothing can go wrong. Nothing . . . like Juliet stumbling over Cecilia's dead body on the morning of the race. When Pete is arrested for Cecilia's murder, Juliet sets out to clear his name. She'll do whatever it takes-even if it means standing up to the police and her ex-boyfriend. But there isn't enough espresso in the world for the greatest challenge in her path: infiltrating Nashville's high society to uncover the hidden hotbed of scandal without running afoul of the law herself. With her last dime staked on Pete's bail bond and her staff growing jittery, the last thing Juliet needs is for her trademark temper to land her behind bars. As time drips away, Juliet needs to crack this case before the killer comes back for another shot. |
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