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Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPS

Precise measurements of the branching ratios for the $K\to\pi\nu\bar{\nu}$ decays can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, $K^+\to\pi^+\nu\bar{\nu}$ and $K_L\to\pi^0\nu\bar{\nu}$, since different new phys...

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Autor principal: Moulson, M.
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1742-6596/800/1/012037
http://cds.cern.ch/record/2233396
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author Moulson, M.
author_facet Moulson, M.
author_sort Moulson, M.
collection CERN
description Precise measurements of the branching ratios for the $K\to\pi\nu\bar{\nu}$ decays can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, $K^+\to\pi^+\nu\bar{\nu}$ and $K_L\to\pi^0\nu\bar{\nu}$, since different new physics models affect the rates for each channel differently. We are investigating the feasibility of performing a measurement of BR($K_L\to\pi^0\nu\bar{\nu}$) using a high-energy secondary neutral beam at the CERN SPS in a successor experiment to NA62. The planned experiment would reuse some of the NA62 infrastructure, including possibly the NA48 liquid-krypton calorimeter. The mean momentum of $K_L$ mesons decaying in the fiducial volume is 70 GeV; the decay products are boosted forward, so that less demanding performance is required from the large-angle photon veto detectors. On the other hand, the layout poses particular challenges for the design of the small-angle vetoes, which must reject photons from $K_L$ decays escaping through the beam pipe amidst an intense background from soft photons and neutrons in the beam. We present some preliminary conclusions from our feasibility studies, summarizing the design challenges faced and the sensitivity obtainable for the measurement of BR($K_L\to\pi^0\nu\bar{\nu}$).
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spelling cern-22333962021-05-03T20:22:57Zdoi:10.1088/1742-6596/800/1/012037http://cds.cern.ch/record/2233396engMoulson, M.Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPSParticle Physics - ExperimentPrecise measurements of the branching ratios for the $K\to\pi\nu\bar{\nu}$ decays can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, $K^+\to\pi^+\nu\bar{\nu}$ and $K_L\to\pi^0\nu\bar{\nu}$, since different new physics models affect the rates for each channel differently. We are investigating the feasibility of performing a measurement of BR($K_L\to\pi^0\nu\bar{\nu}$) using a high-energy secondary neutral beam at the CERN SPS in a successor experiment to NA62. The planned experiment would reuse some of the NA62 infrastructure, including possibly the NA48 liquid-krypton calorimeter. The mean momentum of $K_L$ mesons decaying in the fiducial volume is 70 GeV; the decay products are boosted forward, so that less demanding performance is required from the large-angle photon veto detectors. On the other hand, the layout poses particular challenges for the design of the small-angle vetoes, which must reject photons from $K_L$ decays escaping through the beam pipe amidst an intense background from soft photons and neutrons in the beam. We present some preliminary conclusions from our feasibility studies, summarizing the design challenges faced and the sensitivity obtainable for the measurement of BR($K_L\to\pi^0\nu\bar{\nu}$).Precise measurements of the branching ratios for the $K\to\pi\nu\bar{\nu}$ decays can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, $K^+\to\pi^+\nu\bar{\nu}$ and $K_L\to\pi^0\nu\bar{\nu}$, since different new physics models affect the rates for each channel differently. We are investigating the feasibility of performing a measurement of BR($K_L\to\pi^0\nu\bar{\nu}$) using a high-energy secondary neutral beam at the CERN SPS in a successor experiment to NA62. The planned experiment would reuse some of the NA62 infrastructure, including possibly the NA48 liquid-krypton calorimeter. The mean momentum of $K_L$ mesons decaying in the fiducial volume is 70 GeV; the decay products are boosted forward, so that less demanding performance is required from the large-angle photon veto detectors. On the other hand, the layout poses particular challenges for the design of the small-angle vetoes, which must reject photons from $K_L$ decays escaping through the beam pipe amidst an intense background from soft photons and neutrons in the beam. We present some preliminary conclusions from our feasibility studies, summarizing the design challenges faced and the sensitivity obtainable for the measurement of BR($K_L\to\pi^0\nu\bar{\nu}$).Precise measurements of the branching ratios for the decays can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, and , since different new physics models affect the rates for each channel differently. We are investigating the feasibility of performing a measurement of using a high-energy secondary neutral beam at the CERN SPS in a successor experiment to NA62. The planned experiment would reuse some of the NA62 infrastructure, including possibly the NA48 liquid-krypton calorimeter. The mean momentum of mesons decaying in the fiducial volume is 70 GeV, the decay products are boosted forward, so that less demanding performance is required from the large-angle photon veto detectors. On the other hand, the layout poses particular challenges for the design of the small-angle vetoes, which must reject photons from decays escaping through the beam pipe amidst an intense background from soft photons and neutrons in the beam. We present some preliminary conclusions from our feasibility studies, summarizing the design challenges faced and the sensitivity obtainable for the measurement of .arXiv:1611.04864oai:cds.cern.ch:22333962016-11-15
spellingShingle Particle Physics - Experiment
Moulson, M.
Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPS
title Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPS
title_full Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPS
title_fullStr Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPS
title_full_unstemmed Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPS
title_short Prospects for an experiment to measure BR($K_L\to\pi^0\nu\bar{\nu}$) at the CERN SPS
title_sort prospects for an experiment to measure br($k_l\to\pi^0\nu\bar{\nu}$) at the cern sps
topic Particle Physics - Experiment
url https://dx.doi.org/10.1088/1742-6596/800/1/012037
http://cds.cern.ch/record/2233396
work_keys_str_mv AT moulsonm prospectsforanexperimenttomeasurebrkltopi0nubarnuatthecernsps