Subject: 1st draft of SciBar coherent pion papert From: Masaya HASEGAWA <masaya@scphys.kyoto-u.ac.jp> Message-ID: <050405223237.M0318917@k2k10.scphys.kyoto-u.ac.jp> Date: Tue, 5 Apr 2005 22:32:37 +0900 Dear K2K Collaborators, We are very sorry for this delayed announcement, but now the first draft of coherent paper is ready for the internal review by collaboration. You can download the manuscript from: http://neutrino.kek.jp/internal/papers/coherent/ This draft is written based on the results presented at the last collaboration meeting in Stony Brook. ****************************** Please send your comments to coherentpaper@neutrino.kek.jp BEFORE Apr. 19 (Tue.) 23:59. ****************************** Some comments from the committee follow: -- At this moment, the author list and acknowledgment are just taken from recent nu_mu disappearance oscillation paper. -- One of Committee members was concerned about calculation of upper limit presented in this paper. According to the suggestion, we calculated an upper limit using another method described in PRD67, 012002 (2003). We estimate an upper limit of signal events using the number of observed events, signal efficiency, expected background and their uncertainty, but neglecting the correlation between systematic uncertainties, because it would take several more months to evaluate. In the end, we find a 90% C.L. upper limit of coherent pion production is 114.9 events. This corresponds to an upper limit of 6.7x10^-3 for cross-section ratio to the total CC, which is about 10% higher than the number in the draft (6.0x10^-3). The difference seen by two methods is order of 10% and will not change the physics objective of this paper, while we need several more months to completely evaluate the upper limit taking the correlation into account. Thus, considering the importance of our result and available manpower, we want to publish the paper with the original number as calculated by Hasegawa as soon as possible, although one of committee member is still concerned that careful referee of the journal may comment on this topic and we are aware of this issue. SciBar coherent pion paper committee M.Hasegawa, T.Kutter, F.Sanchez, T.Sato, L.Whitehead, M.Yokoyama
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