Revisiting the 'LSND anomaly' II: critique of the data analysis

Bolshakova, A.; Wotschack, J.; Emelyanov, D.; Elagin, A.; Nefedov, Yu.; Kroumchtein, Z.; Ammosov, V.; Guskov, A.; Dydak, F.; Koreshev, V.; Boyko, I.; Chelkov, G.; Zaets, V.; Usenko, E.; Zhemchugov, A.; Semak, A.; Dedovitch, D.; Nikolaev, K.; Sviridov, Yu.; Gapienko, V.; De Min, A.; Gostkin, M.

doi:10.1103/PhysRevD.85.092009

Article
Report number	arXiv:1112.0907 ; CERN-PH-EP-2011-200 ; CERN-PH-EP-2011-200
Title	Revisiting the 'LSND anomaly' II: critique of the data analysis
Author(s)	Bolshakova, A. (Dubna, JINR) ; Boyko, I. (Dubna, JINR) ; Chelkov, G. (Dubna, JINR) ; Dedovitch, D. (Dubna, JINR) ; Elagin, A. (Dubna, JINR) ; Emelyanov, D. (Dubna, JINR) ; Gostkin, M. (Dubna, JINR) ; Guskov, A. (Dubna, JINR) ; Kroumchtein, Z. (Dubna, JINR) ; Nefedov, Yu. (Dubna, JINR) ; Nikolaev, K. (Dubna, JINR) ; Zhemchugov, A. (Dubna, JINR) ; Dydak, F. (CERN) ; Wotschack, J. (CERN) ; De Min, A. (INFN, Milan Bicocca) ; Ammosov, V. (Serpukhov, IHEP) ; Gapienko, V. (Serpukhov, IHEP) ; Koreshev, V. (Serpukhov, IHEP) ; Semak, A. (Serpukhov, IHEP) ; Sviridov, Yu. (Serpukhov, IHEP) ; Usenko, E. (Serpukhov, IHEP) ; Zaets, V. (Serpukhov, IHEP)
Publication	2012
Imprint	25 Nov 2011
Number of pages	30
Note	Comments: 30 pages, 16 figures, 6 tables 30 pages, 16 figures, 6 tables
In:	Phys. Rev. D 85 (2012) 092009
DOI	10.1103/PhysRevD.85.092009
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN PS ; HARP PS214
Free keywords	electroweak interaction ; experimental results ; HARP-CDP ; LSND experiment ; LSND anomaly ; neutrinos ; neutrino oscillations
Abstract	This paper, together with a preceding paper, questions the so-called `LSND anomaly': a 3.8 $\sigma$ excess of $\bar{\nu}_{\rm e}$ interactions over standard backgrounds, observed by the LSND Collaboration in a beam dump experiment with 800 MeV protons. That excess has been interpreted as evidence for the \anumtoanue\ oscillation in the $\Delta m^2$ range from 0.2 eV$^2$ to 2 eV$^2$. Such a $\Delta m^2$ range is incompatible with the widely accepted model of oscillations between three light neutrino species and would require the existence of at least one light `sterile' neutrino. In a preceding paper, it was concluded that the estimates of standard backgrounds must be significantly increased. In this paper, the LSND Collaboration's estimate of the number of $\bar{\nu}_{\rm e}$ interactions followed by neutron capture, and of its error, is questioned. The overall conclusion is that the significance of the `LSND anomaly' is not larger than 2.3 $\sigma$. \end{abstract}
Copyright/License	Preprint: © 2011-2025 CERN (License: CC-BY-3.0)

$``Distributions for correlated 2.2~MeV $\gamma$ (solid curves) and accidental $\gamma$ (dashed curves). The top plot shows the distance between the reconstructed $\gamma$ position and positron position, $\Delta r$, the middle plot shows the time interval between the $\gamma$ and positron, $\Delta t$, and the bottom plot shows the number of hit phototubes associated with the $\gamma$, $N_{\rm hits}$.'' (Figure and its caption copied from Fig.~10 in Ref.~\cite{LSNDPRD64}.)$ $``The \Rgam\ distribution for events that satisfy the selection criteria for the primary \anumtoanue\ oscillation search.'' (Figure and its caption copied from Fig.~14 in Ref.~\cite{LSNDPRD64}.)$ $noimgNumerical values of the bin contents in Fig.~\ref{Fig14inPRD64} for the $R_{\gamma}$ distributions of correlated $\gamma$'s, accidental $\gamma$'s, and of the data including errors.$ Show more plots

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