Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques
The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ[subscript 13] using reactor [bar over ν[subscript e]] observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. This measurement is based on 462.72 live days data, approximately twic...
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| Format: | Article |
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Springer/SISSA
2016
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| Online Access: | http://hdl.handle.net/1721.1/101608 https://orcid.org/0000-0002-6393-0438 |
| _version_ | 1826206518566977536 |
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| author | Spitz, Joshua B. Terao, Kazuhiro Conrad, Janet Marie |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Spitz, Joshua B. Terao, Kazuhiro Conrad, Janet Marie |
| author_sort | Spitz, Joshua B. |
| collection | MIT |
| description | The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ[subscript 13] using reactor [bar over ν[subscript e]] observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. This measurement is based on 462.72 live days data, approximately twice as much data as in the previous such analysis, collected with a detector positioned at an average distance of 1050 m from two reactor cores. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties. Accidental coincidences, the dominant background in this analysis, are suppressed by more than an order of magnitude with respect to our previous publication by a multi-variate analysis. These improvements demonstrate the capability of precise measurement of reactor [bar over ν[subscript e]] without gadolinium loading. Spectral distortions from the [bar over ν[subscript e]] reactor flux predictions previously reported with the neutron capture on gadolinium events are confirmed in the independent data sample presented here. A value of sin 2[superscript 2] θ[subscript 13] = 0.095 [+ 0.038 over − 0.039] (stat+syst) is obtained from a fit to the observed event rate as a function of the reactor power, a method insensitive to the energy spectrum shape. A simultaneous fit of the hydrogen capture events and of the gadolinium capture events yields a measurement of sin[superscript 2] 2θ[subscript 13] = 0.088 ± 0.033(stat+syst). |
| first_indexed | 2024-09-23T13:34:15Z |
| format | Article |
| id | mit-1721.1/101608 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:34:15Z |
| publishDate | 2016 |
| publisher | Springer/SISSA |
| record_format | dspace |
| spelling | mit-1721.1/1016082023-02-26T05:54:34Z Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques Spitz, Joshua B. Terao, Kazuhiro Conrad, Janet Marie Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Conrad, Janet Spitz, Joshua B. Terao, Kazuhiro The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ[subscript 13] using reactor [bar over ν[subscript e]] observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. This measurement is based on 462.72 live days data, approximately twice as much data as in the previous such analysis, collected with a detector positioned at an average distance of 1050 m from two reactor cores. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties. Accidental coincidences, the dominant background in this analysis, are suppressed by more than an order of magnitude with respect to our previous publication by a multi-variate analysis. These improvements demonstrate the capability of precise measurement of reactor [bar over ν[subscript e]] without gadolinium loading. Spectral distortions from the [bar over ν[subscript e]] reactor flux predictions previously reported with the neutron capture on gadolinium events are confirmed in the independent data sample presented here. A value of sin 2[superscript 2] θ[subscript 13] = 0.095 [+ 0.038 over − 0.039] (stat+syst) is obtained from a fit to the observed event rate as a function of the reactor power, a method insensitive to the energy spectrum shape. A simultaneous fit of the hydrogen capture events and of the gadolinium capture events yields a measurement of sin[superscript 2] 2θ[subscript 13] = 0.088 ± 0.033(stat+syst). United States. Dept. of Energy National Science Foundation (U.S.) 2016-03-04T19:09:21Z 2016-03-04T19:09:21Z 2016-01 2015-12 2016-03-04T17:03:34Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/101608 Abe, Y., S. Appel, T. Abrahao, H. Almazan, C. Alt, J.C. dos Anjos, J.C. Barriere, et al. “Measurement of θ[subscript 13] in Double Chooz Using Neutron Captures on Hydrogen with Novel Background Rejection Techniques.” J. High Energ. Phys. 2016, no. 1 (January 2016). https://orcid.org/0000-0002-6393-0438 http://dx.doi.org/10.1007/JHEP01(2016)163 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer/SISSA TopicHub SCOAP3 |
| spellingShingle | Spitz, Joshua B. Terao, Kazuhiro Conrad, Janet Marie Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques |
| title | Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques |
| title_full | Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques |
| title_fullStr | Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques |
| title_full_unstemmed | Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques |
| title_short | Measurement of θ[subscript 13] in Double Chooz using neutron captures on hydrogen with novel background rejection techniques |
| title_sort | measurement of θ subscript 13 in double chooz using neutron captures on hydrogen with novel background rejection techniques |
| url | http://hdl.handle.net/1721.1/101608 https://orcid.org/0000-0002-6393-0438 |
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