Neutrino Phenomenology

Antonio Marrone

Full Professor of Theoretical Physics

What neutrinos can tell us about the universe, and about what lies beyond the Standard Model.

Università degli Studi di Bari “Aldo Moro” · INFN Sezione di Bari

Research statement

Neutrino phenomenology and the flavour puzzle

My research lies at the interface between neutrino physics, particle phenomenology and cosmology. With the Bari group I have contributed to a long line of global analyses of neutrino oscillation data, combining solar, atmospheric, reactor and accelerator experiments to determine the parameters of leptonic mixing with state-of-the-art precision.

As measurements enter the subpercent regime, these results constrain the neutrino mass ordering, leptonic CP violation and the absolute mass scale, and probe possible signatures of physics beyond the three-neutrino paradigm. A complementary line of work investigates modular invariance as a candidate symmetry underlying the flavour structure of quarks and leptons.

The upper half-plane with the shaded fundamental domain of the modular group SL(2,Z), bounded by the unit circle and the lines Re(tau) = ±1/2, with the fixed points i, omega and −omega-bar marked.
The complex modulus τ lives in the shaded fundamental domain of SL(2,ℤ). In the modular-invariant approach, Yukawa couplings are modular forms of τ; the fixed points i, ω, −ω̄ and i∞ carry residual symmetries.

Oscillation parameters

The current snapshot of the Bari global analysis: best fits and 3σ ranges, normal ordering, from the Bari Release 2026.a after the second JUNO data release — preliminary, the paper is in preparation.

Solar mixing angle
0.3047 3σ: 0.2888 – 0.3217
sin²θ₁₂ · 1.8 % precision (1σ)
Preliminary Bari Release 2026.a
Reactor mixing angle
0.0222 3σ: 0.0205 – 0.0238
sin²θ₁₃ · 2.5 % precision (1σ)
Preliminary Bari Release 2026.a
Atmospheric mixing angle
0.491 3σ: 0.444 – 0.573
sin²θ₂₃ · 4.4 % precision · both octants allowed up to 3σ
Preliminary Bari Release 2026.a
Solar splitting
7.465 ×10⁻⁵ eV² · 3σ: 7.239 – 7.681
δm² · 1.0 % precision (1σ)
Preliminary Bari Release 2026.a
Atmospheric splitting
2.472 ×10⁻³ eV² · 3σ: 2.432 – 2.517
|Δm²| · 0.5 % precision (1σ)
Preliminary Bari Release 2026.a
Leptonic CP phase
1.19 3σ: 0.79 – 1.95
δ/π · δ = 0 disfavoured at 3.2σ, δ = π at 1.4σ
Preliminary Bari Release 2026.a

Preliminary. Bari Release 2026.a, after the second JUNO data release: the paper is in preparation and these values may still change. Final combination of long-baseline accelerator, solar, reactor and atmospheric data; normal ordering, favoured over inverted at 3.9σ (Δχ²IO−NO = 15.34). δm² = m₂² − m₁², Δm² = m₃² − (m₁² + m₂²)/2. The 1σ precision is the 1σ error divided by the best fit; for sin²θ₂₃, whose 3σ range spans both octants, one sixth of the 3σ range divided by the best fit.

Ci fu una grande battaglia di idee: alla fine non rimasero né vinti, né vincitori, né idee

(There was a great battle of ideas: in the end there were left neither vanquished, nor victors, nor ideas)

Stefano Benni

L’ultimo che lascia la Terra spenga il Sole

(Will the last one to leave the Earth please switch off the Sun)

Douglas Adams

Photography

A selection of my own photographs, shown uncropped.

Two people passing a statue in a walled garden, in black and white.
Under the pines
Matera at night, the lit town climbing the hillside under a black sky.
Matera by night
A chevron road sign and a leaning utility pole in open countryside, in black and white.
Bend ahead
An avenue of cypresses beside a modern white colonnade, in black and white.
Cypresses
The Sassi of Matera: tufa houses carved into the rock face, in black and white.
Sassi di Matera
A road sign silhouetted against a heavy sky at dusk, in black and white.
Dusk

Contact

Students, collaborators and prospective thesis candidates are welcome to write to either institutional address.

Address

Dipartimento Interateneo di Fisica
Università degli Studi di Bari & INFN Bari
Via Amendola 173 — 70126 Bari, Italy

Phone

+39 080 544 3463