Research output:

• Pheno / Global

PhD theses

Devel resources:

Mailing list
SVN repository
VALOR @ Slack
VALOR @ Taiga

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VALOR is a neutrino fitting group established within the T2K experiment in 2010 and named after its initial participants (Valencia-Lancaster-Oxford-Rutherford). The VALOR group led numerous flagship T2K oscillation analyses, produced world-leading results on behalf of the T2K collaboration and contributed to most published T2K oscillation papers. The existence of a powerful, flexible, well-validated, and optimised analysis and software framework, enabled the VALOR group to adapt its advanced analysis procedures on several other experiments. Today the group also plays an important role in physics sensitivity and design optimisation studies for the DUNE and HyperK experiments, as well as in preparations for the physics exploitation of the Fermilab SBN programme. VALOR is an ideal environment for the development of multi-experiment neutrino oscillation fits with proper treatment of correlated systematic uncertainties, and the VALOR group aims to bring a paradigm shift in the global analysis of neutrino oscillation data.

Current VALOR group members

Costas Andreopoulos [1,2] (*), Chistopher Barry [1], Francis Bench [1], Andrew Chappell [3], Thomas Dealtry [4], Steve Dennis [1], Lorena Escudero [5], Rhiannon Jones [1], Nick Grant [3], Marco Roda [1], Davide Sgalaberna [6] and Raj Shah [2,7]

[1] University of Liverpool, Physics Department, Oliver Lodge Laboratory, Liverpool L69 7ZE, UK
[2] STFC Rutherford Appleton Laboratory, Particle Physics Department, Harwell Oxford Campus, OX11 0QX, UK
[3] University of Warwick, Physics Department, Coventry CV4 7AL, UK
[4] Lancaster University, Physics Department, Lancaster, LA1 4YB, UK
[5] University of Cambridge, Cavendish Laboratory, Cambridge CB3 0HE, UK
[6] University of Geneva, Département de physique nucléaire et corpusculaire, 1211 Genève, Switzerland
[7] University of Oxford, Subdepartment of Particle Physics, Oxford, OX1 3RH, UK

(*) For all communications, e-mail: costas.andreopoulos \at

Distribution of VALOR code

The VALOR group has no short-term plans to distribute the VALOR source code and support it as a general neutrino analysis framework.

Research outputs

T2K collected data in several periods with different conditions and proton-on-target (POT) exposures, both in neutrino-enhanced Forward Horn Current (FHC) and antineutrino-enhanced Reversed Horn Current (RHC) modes: Run 1 (01-06/2010, FHC: 0.323x1020 POT), Run 2 (10/2010-03/2011, FHC: 1.108x1020 POT), Run 3 (03-06/2012, FHC: 1.579x1020 POT), Run 4 (10/2012-05/2013, FHC: 3.560x1020 POT), Run 5 (05-06/2014, FHC: 0.242x1020 POT and RHC: 0.506x1020 POT), Run 6 (10/2014-06/2015, FHC: 0.190x1020 POT and RHC: 3.505x1020 POT), Run 7 (02-05/2016, FHC: 0.480x1020 POT and RHC: 3.460x1020 POT), and Run 8 (10/2016-04/2017, FHC: 7.170x1020 POT).

VALOR/HyperK 3-flavour oscillation sensitivity studies.

VALOR provides a sensitive joint 3-flavour oscillation and systematics constraint fit for DUNE, and produced the first-ever realistic sensitivity calculations from an end-to-end analysis using full event simulation and reconstruction. The analysis considers several DUNE Near and Far detector event samples. O(50) event samples are used in the latest version of the analysis, constraining O(500) neutrino flux and interaction systematic parameters and providing a realistic DUNE oscillation sensitivity simulation. The analysis supports all three proposed Near Detector options - Fine Grained Tracker (FGT), High-pressure Gas Argon TPC (GArTPC) and Liquid Argon TPC (LArTPC) - as well as hybrid options.

  • 2017a analysis (analysis used for the final DUNE Near Detector Task Force report):
            → Technical note: - Code: app / fmwk
            → Contribution to the DUNE Near Detector Task Force report, DUNE-doc-1792
            → Contribution to journal publication on the High-Pressure Gaseous Argon TPC option for DUNE

VALOR provides a joint sterile neutrino oscillation and systematics constraint fit for SBN. The VALOR SBN analysis derives from the VALOR DUNE analysis, and fits jointly O(100) exclusive / semi-inclusive samples from all three SBN LArTPC detectors (SBND, MicroBooNE, ICARUS) in order to derive a sensitive estimation of sterile neutrino oscillation parameters and an in-situ constrain of O(500) neutrino flux, cross-section and detector systematic parameters.

  • 2017a SBN sensitivity simulations:
            → Technical note: - Code:

VALOR oscillation phenomenology, sensitivity and multi-experiment fit results using public domain inputs.
  • Watch this space.

VALOR conference / workshop talks.

VALOR posters.

PhD theses with a VALOR analysis.