Long-Baseline Neutrino Experimentation

JimHill

Abstract:

Neutrino experimentation has moved into an era where precisely designed experiments are investigating the evidence provided by observations of solar and atmospheric neutrinos. In particular, accelerator experiments with baselines of hundreds of kilometers are designed to probe the evidence for oscillations from atmospheric observations. Status of the current generation of experiments is reviewed and preliminary results from the one running experiment in this class, $\textcolor{blue}{\cal K}{\scriptsize 2}\textcolor{red}{\cal K}$, are presented.

$\textcolor{blue}{\cal K} {\scriptsize 2}\textcolor{red}{\cal K}$ has just submitted its first ``physics paper'' to PL-B¹ and posted it on the web as an e-print. (It was submitted in late February, 2001 and posted a few days later.)

Preface

This represents the combination of a few talks for varying levels of expertise and slightly different time constraints. (-From conferences last fall, through a half dozen winter job interviews, leading up to a couple seminars in March 2001. That may make it a bit disjoint and it is also significantly longer than any single talk. Sorry, but I don't have time now to post them all separately.) It is essentially not really one talk, but a ``logical .OR.'' of the set of talks. Some of the the talks had slightly different titles, including ``Neutrinos: The Other Mixing Matrix'' and ``Neutrinos Then and Now.''

All the slides from the talks are reproduced with much narrative filled in. A few slides are updated since the earlier presentations. A few pictures are supplemented by links to pages with original pictures (and more of them!). A few figures are added to answer questions that came up during one talk or another. The material presented generally represents the state of analysis at the beginning of 2001, with $2.3\cdot 10^{19}$ protons on target accumulated from June of 1999 through June of 2000, about 1/4 of the planned $10^{20}$ protons on target. The beamline has been active again since mid-January 2001 with plans to get almost as much data in this calendar year. A couple plots (noted at their occurrence in the document) are slightly outdated and therefor missing an event or two. This should not affect any overall conclusion from them.

Disclaimers: