First observation of coherent π0 production in neutrino-nucleus interactions with Eν <2 GeV
First observation of coherent π0 production in neutrino-nucleus interactions with Eν <2 GeV
复制标题
首次观察到 Eν <2 GeV 的中微子-原子核相互作用中相干 π0 的产生
DOI：
10.1016/j.physletb.2008.05.006
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发表时间：
2008
影响因子：
4.4
通讯作者：
E. Zimmerman
中科院分区：
文献类型：
--
作者：
A. Aguilar;C. Anderson;A. Bazarko;S. Brice;B. Brown;L. Bugel;Jun Cao;L. Coney;J. Conrad;D. Cox;A. Curioni;Z. Djurcic;D. Finley;B. Fleming;R. Ford;F. Garcia;G. Garvey;C. Green;C. Green;J. Green;J. Green;T. Hart;E. Hawker;E. Hawker;R. Imlay;R. Johnson;G. Karagiori;P. Kasper;T. Katori;T. Kobilarcik;I. Kourbanis;S. Koutsoliotas;E. Laird;S. Linden;J. Link;Y. Liu;W. Louis;K. Mahn;W. Marsh;P. Martin;G. McGregor;W. Metcalf;P. Meyers;F. Mills;G. Mills;J. Monroe;C. Moore;R. Nelson;V. Nguyen;P. Nienaber;J. Nowak;S. Ouedraogo;R. Patterson;D. Perevalov;C. Polly;E. Prebys;J. Raaf;H. Ray;H. Ray;B. Roe;A. Russell;V. Sandberg;R. Schirato;D. Schmitz;M. Shaevitz;F. Shoemaker;David C. Smith;M. Soderberg;M. Sorel;P. Spentzouris;I. Stancu;R. Stefanski;M. Sung;H. Tanaka;R. Tayloe;M. Tzanov;R. D. Water;M. Wascko;D. H. White;M. Wilking;H. Yang;G. Zeller;G. Zeller;E. Zimmerman
费米实验室的MiniBooNE实验积累了迄今为止最大的低能中性流（NC）中微子-核相互作用产生的π 0 s样本。这封信报告了矿物油（CH 2）中产生的π 0 s动量分布的测量结果，以及首次观察到低于2 GeV的相干π 0产生。在向前的方向上，观察到的事件的产量高于共振生产的预期主要归因于相干生产碳，但也可能包括一个小的贡献，从衍射生产氢。在MiniBooNE中微子通量上积分，NC相干模和衍射模之和占MiniBooNE全部NC π 0产生的（19.5±1.1（stat）±2.5（sys））%.这些测量具有直接效用，因为它们量化了MiniBooNE寻找νμ→ ν振荡的重要背景。
The MiniBooNE experiment at Fermilab has amassed the largest sample to date of π0s produced in neutral current (NC) neutrino–nucleus interactions at low energy. This Letter reports a measurement of the momentum distribution of π0s produced in mineral oil (CH2) and the first observation of coherent π0production below 2 GeV. In the forward direction, the yield of events observed above the expectation for resonant production is attributed primarily to coherent production off carbon, but may also include a small contribution from diffractive production on hydrogen. Integrated over the MiniBooNE neutrino flux, the sum of the NC coherent and diffractive modes is found to be (19.5±1.1(stat)±2.5(sys))% of all exclusive NC π0production at MiniBooNE. These measurements are of immediate utility because they quantify an important background to MiniBooNE's search for νμ→νeoscillations.