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Title: Candidate events in a search for {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations

Abstract

A search for {bar {nu}}{sub {ital e}}`s in excess of the number expected from conventional sources has been made using the Liquid Scintillator Neutrino Detector, located 30 m behind the Los Alamos Meson Physics Facility beam stop. The {bar {nu}}{sub {ital e}} are detected via {bar {nu}}{sub {ital e}} {ital p}{r_arrow}{ital e}{sup +}{ital n} with {ital e}{sup +} energy between 36 and 60 MeV, followed by a {gamma} ray from {ital np}{r_arrow}{ital d}{gamma} (2.2 MeV). Using strict cuts to identify {gamma} rays correlated with {ital e}{sup +} yields 9 events with only 2.1{plus_minus}0.3 background expected. A likelihood fit to the entire {ital e}{sup +} sample results in a total excess of 16.4{sub {minus}8.9}{sup +9.7}{plus_minus}3.3 events. If attributed to {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations, this corresponds to an oscillation probability of (0.34{sub {minus}0.18}{sup +0.20}{plus_minus}0.07)%.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] « less
  1. University of California, Riverside, California 92521 (United States)|[University of California, San Diego, California 92093 (United States)|[University of California, Santa Barbara, California 93106 (United States)|[University of California Intercampus Institute for Research at Particle Accelerators, Stanford, California 94309 (United States)|[Embry Riddle Aeronautical University, Prescott, Arizona 86301 (United States)|[Linfield College, McMinnville, Oregon 97128 (United States)|[Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)|[Louisiana State University, Baton Rouge, Louisiana 70803 (United States)|[Louisiana Tech University, Ruston, Louisiana 71272 (United States)|[University of New Mexico, Albuquerque, New Mexico 87131 (United States)|[Southern University, Baton Rouge, Louisiana 70813 (United States)|[Temple University, Philadelphia, Pennsylvania 19122 (United States)
Publication Date:
OSTI Identifier:
118579
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 75; Journal Issue: 14; Other Information: PBD: 2 Oct 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; ELECTRON NEUTRINOS; NEUTRINO OSCILLATION; MUON NEUTRINOS; ENERGY; GAMMA RADIATION; LIQUID SCINTILLATION DETECTORS; LOS ALAMOS

Citation Formats

Athanassopoulos, C., Auerbach, L.B., Bauer, D.A., Bolton, R.D., Boyd, B., Burman, R.L., Caldwell, D.O., Cohen, I., Dieterle, B.D., Donahue, J.B., Eisner, A.M., Fazely, A., Federspiel, F.J., Garvey, G.T., Gray, M., Gunasingha, R.M., Highland, V., Imlay, R., Johnston, K., Louis, W.C., Lu, A., Margulies, J., McIlhany, K., Metcalf, W., Reeder, R.A., Sandberg, V., Schillaci, M., Smith, D., Stancu, I., Strossman, W., Sullivan, M.K., VanDalen, G.J., Vernon, W., Wang, Y., White, D.H., Whitehouse, D., Works, D., Xiao, Y., and Yellin, S. Candidate events in a search for {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations. United States: N. p., 1995. Web. doi:10.1103/PhysRevLett.75.2650.
Athanassopoulos, C., Auerbach, L.B., Bauer, D.A., Bolton, R.D., Boyd, B., Burman, R.L., Caldwell, D.O., Cohen, I., Dieterle, B.D., Donahue, J.B., Eisner, A.M., Fazely, A., Federspiel, F.J., Garvey, G.T., Gray, M., Gunasingha, R.M., Highland, V., Imlay, R., Johnston, K., Louis, W.C., Lu, A., Margulies, J., McIlhany, K., Metcalf, W., Reeder, R.A., Sandberg, V., Schillaci, M., Smith, D., Stancu, I., Strossman, W., Sullivan, M.K., VanDalen, G.J., Vernon, W., Wang, Y., White, D.H., Whitehouse, D., Works, D., Xiao, Y., & Yellin, S. Candidate events in a search for {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations. United States. doi:10.1103/PhysRevLett.75.2650.
Athanassopoulos, C., Auerbach, L.B., Bauer, D.A., Bolton, R.D., Boyd, B., Burman, R.L., Caldwell, D.O., Cohen, I., Dieterle, B.D., Donahue, J.B., Eisner, A.M., Fazely, A., Federspiel, F.J., Garvey, G.T., Gray, M., Gunasingha, R.M., Highland, V., Imlay, R., Johnston, K., Louis, W.C., Lu, A., Margulies, J., McIlhany, K., Metcalf, W., Reeder, R.A., Sandberg, V., Schillaci, M., Smith, D., Stancu, I., Strossman, W., Sullivan, M.K., VanDalen, G.J., Vernon, W., Wang, Y., White, D.H., Whitehouse, D., Works, D., Xiao, Y., and Yellin, S. Mon . "Candidate events in a search for {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations". United States. doi:10.1103/PhysRevLett.75.2650.
@article{osti_118579,
title = {Candidate events in a search for {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations},
author = {Athanassopoulos, C. and Auerbach, L.B. and Bauer, D.A. and Bolton, R.D. and Boyd, B. and Burman, R.L. and Caldwell, D.O. and Cohen, I. and Dieterle, B.D. and Donahue, J.B. and Eisner, A.M. and Fazely, A. and Federspiel, F.J. and Garvey, G.T. and Gray, M. and Gunasingha, R.M. and Highland, V. and Imlay, R. and Johnston, K. and Louis, W.C. and Lu, A. and Margulies, J. and McIlhany, K. and Metcalf, W. and Reeder, R.A. and Sandberg, V. and Schillaci, M. and Smith, D. and Stancu, I. and Strossman, W. and Sullivan, M.K. and VanDalen, G.J. and Vernon, W. and Wang, Y. and White, D.H. and Whitehouse, D. and Works, D. and Xiao, Y. and Yellin, S.},
abstractNote = {A search for {bar {nu}}{sub {ital e}}`s in excess of the number expected from conventional sources has been made using the Liquid Scintillator Neutrino Detector, located 30 m behind the Los Alamos Meson Physics Facility beam stop. The {bar {nu}}{sub {ital e}} are detected via {bar {nu}}{sub {ital e}} {ital p}{r_arrow}{ital e}{sup +}{ital n} with {ital e}{sup +} energy between 36 and 60 MeV, followed by a {gamma} ray from {ital np}{r_arrow}{ital d}{gamma} (2.2 MeV). Using strict cuts to identify {gamma} rays correlated with {ital e}{sup +} yields 9 events with only 2.1{plus_minus}0.3 background expected. A likelihood fit to the entire {ital e}{sup +} sample results in a total excess of 16.4{sub {minus}8.9}{sup +9.7}{plus_minus}3.3 events. If attributed to {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations, this corresponds to an oscillation probability of (0.34{sub {minus}0.18}{sup +0.20}{plus_minus}0.07)%.},
doi = {10.1103/PhysRevLett.75.2650},
journal = {Physical Review Letters},
number = 14,
volume = 75,
place = {United States},
year = {1995},
month = {10}
}