01
HADRON SPECTROSCOPY
What holds exotic matter together?
Exploring tetraquarks and pentaquarks, hadronic molecules, hybrids and glueballs. We connect heavy- and light-flavor spectroscopy through LHCb and COMPASS.
Exotic states · Strong interaction
HADRON PHYSICS · BOCHUM
Small particles.
Fundamental
questions.
Exploring how quarks and gluons form matter, and what exotic hadrons reveal about the strong interaction.
CONNECTED THROUGH SCIENCELHCb ↗COMPASS ↗JPAC ↗Particle Data Group ↗DEMOS ↗SHARP COST Action CA24159↗HADRON2030
01 / RESEARCH
Understanding matter.
Connecting the pieces.
We bring experiment, theory and computation together to study the rich spectrum of hadrons.
02
AMPLITUDES & COMPUTING
From collision data to particle properties.
Reaction modeling, partial-wave analysis and phenomenology connect experimental observations to the underlying physics. Machine learning helps us investigate complex data.
Amplitude analysis · Machine learning
03
DETECTOR DEVELOPMENT
Building the next view of a collision.
Our work on the LHCb SciFi tracker connects detector operation and upgrades with photosensor readout, silicon photomultipliers and fast front-end electronics.
SciFi tracker · Photosensor readout
OPEN & REUSABLE RESEARCH
Physics you can build on.
Our Julia tools turn reaction theory and quark models into inspectable, reusable scientific software.
GIModel.jl ↗
Meson masses, wavefunctions and decays from the Godfrey–Isgur quark model.
ThreeBodyDecays.jl ↗
Three-body decay kinematics and amplitude models.
HadronicLineshapes.jl ↗
Reusable resonance models for hadronic amplitudes.
CascadeDecays.jl ↗
Decay amplitudes built from sequential decay chains in a cascade basis.
NumericalDistributions.jl ↗
Numerically defined probability distributions with automatic normalization and sampling.
LorentzVectorBase.jl ↗
Shared interfaces for four-momenta and relativistic kinematics in high-energy physics.
FourVectors.jl ↗
Cartesian four-momenta, spatial rotations and Lorentz boosts.
From CERN experiments to phenomenological models.Research at EP1 ↗
02 / PEOPLE
A shared curiosity.
Our group at Ruhr University Bochum brings together researchers and students working across hadron physics.
GROUP LEADERProf. Dr.
Prof. Dr.
Mikhail Mikhasenko
Professor at the Institute of Experimental Physics I since November 2023.
Hadron spectroscopy · Reaction modeling and amplitude analysis · Detector development and photosensor readout · Machine learning in HEP
Select a member to explore their research profile.
Marian StahlResearch staff
Research profile coming soon.
Christoph TönnisResearch staff
Research profile coming soon.
Lennart C. F. AhrensDoctoral researcher
Research profile coming soon.
Dhruvanshu ParmarDoctoral researcher
Research profile coming soon.
Ilya SegalDoctoral researcher
Research profile coming soon.
Hendric JonasGroup member
Research topic
Hadronic Decay Modes: laying the foundation for a common communication format between partial-wave-analysis (PWA) frameworks.
Expertise
- Hadronic decay models
- Interoperability between PWA frameworks
Alahi Jeeganahalli InayathbashaMaster’s student
Research profile coming soon.
Rasti SalamMaster’s student
Research profile coming soon.
Sharaf MirzaBachelor’s student
Research profile coming soon.
Anna ZimmerBachelor’s student
Research profile coming soon.
Alexander KazatskyStudent assistant
Research profile coming soon.
Roster checked October 2026.EP1 members directory ↗
03 / TEACHING
Learn the physics.
Ask the next question.
From nuclear and particle physics to advanced data analysis: selected lectures, exercises and seminars taught by Mikhail Mikhasenko.
EP1 course listings ↗BACHELOR’S & MASTER’S THESES
Start with a question.
Interested in data analysis, phenomenology or detector development? Get in touch to discuss a project.
Discuss a thesis project ↗SELECTED TEACHING · 2024–2026
Introduction to Programming with Julia for Physicists
16160237-SS 2026
Introduction to Nuclear and Particle Physics II
Lecture & exercises · 160401 / 160402
Ruhr Hadron Physics Seminar
With M. Fritsch and F. Afzal · 160419
Introduction to Nuclear and Particle Physics I
KT1 · Lecture & exercises
Hadron and Particle Physics
Seminar with M. Fritsch and F. Afzal · 160435
RUB–TU Dortmund Data Analysis
Co-developed block course · 16 lectures and eight tutorials
Hadron Physics
Lecture & exercises with F. Afzal · 160414 / 160415
Hadrons at Large Hadron Collider
Seminar · 160432
Data Analysis in High Energy Physics
160430 / 160431
Dated teaching history. See EP1 for course availability and registration details.
ADVANCED TRAINING & OPEN EDUCATION
Sharing the tools of discovery.
International K-matrix Day
An annual open-access programme founded in 2024, bringing together lectures, exercises, code and recordings.
Explore the resource ↗Schools & advanced lectures
Amplitude analysis at the CERN Summer Programme (2020), Scattering Theory in the Global Classroom (2022), and the Bochum school Modern Techniques in Hadron Spectroscopy (2024).
Research-shaped teaching
Reproducible computational notebooks connect foundational skills to research problems. Our 2026 study examines the benefits and limits of AI-integrated particle physics education.
Explore the resource ↗04 / SELECTED PUBLICATIONS
Ideas, tested against data.
Tcc · Doubly charmed tetraquark
Observation of an exotic narrow doubly charmed tetraquark
LHCb · Nature Physics 18 (2022) 751–754
Discovery · INSPIRE ↗Study of the doubly charmed tetraquark Tcc⁺
LHCb · Nature Communications 13 (2022) 3351
Follow-up study · INSPIRE ↗Methods
Wigner rotations for cascade reactions
K. Habermann & M. Mikhasenko · Physical Review D 111 (2025) 056015
INSPIRE ↗Reviews
Resonances
PDG · Chapter in the Review of Particle Physics, Physical Review D 110 (2024) 030001
INSPIRE · parent review ↗Read the Resonances chapter ↗Scattering Theory
C. Hanhart & M. Mikhasenko · Encyclopedia of Particle Physics, vol. 1 (2026), pp. 107–119
INSPIRE ↗Novel approaches in hadron spectroscopy
JPAC · Progress in Particle and Nuclear Physics 127 (2022) 103981
INSPIRE ↗Light meson spectroscopy
Nature of the a₁(1420)
M. Mikhasenko, B. Ketzer & A. Sarantsev · Physical Review D 91 (2015) 094015
INSPIRE ↗Triangle Singularity as the Origin of the a₁(1420)
COMPASS · Physical Review Letters 127 (2021) 082501
INSPIRE ↗Determination of the pole position of the lightest hybrid meson candidate
JPAC · π₁(1600) · Physical Review Letters 122 (2019) 042002
INSPIRE ↗π⁻p → η⁽′⁾π⁻p in the double-Regge region
L. Bibrzycki et al. · European Physical Journal C 81 (2021) 647; erratum 915
INSPIRE ↗Three-body unitarity
Three-body scattering: Ladders and Resonances
M. Mikhasenko, Y. Wunderlich et al. · JHEP 08 (2019) 080
INSPIRE ↗Khuri–Treiman equations for 3π decays of particles with spin
JPAC · Physical Review D 101 (2020) 054018
INSPIRE ↗ω → 3π and ωπ⁰ transition form factor revisited
JPAC · European Physical Journal C 80 (2020) 1107
INSPIRE ↗Heavy flavor baryons
Observation of excited Ωc⁰ baryons in Ωb⁻ → Ξc⁺K⁻π⁻ decays
LHCb · Physical Review D 104 (2021) L091102
INSPIRE ↗Exotics · Pentaquarks
Observation of a narrow pentaquark state, Pc(4312)⁺, and of two-peak structure of the Pc(4450)⁺
LHCb · Physical Review Letters 122 (2019) 222001
INSPIRE ↗Interpretation of the LHCb Pc(4312)⁺ Signal
JPAC · Physical Review Letters 123 (2019) 092001
INSPIRE ↗Spin
05 / JOIN THE CONVERSATION
Good physics starts
with a connection.
For research collaborations and bachelor’s or master’s projects, we’d love to hear from you.
mikhail.mikhasenko@rub.deRuhr University Bochum
Experimental Physics I
Universitätsstraße 150
44801 Bochum, Germany
NB building · First floor
+49 234 32 12275
Campus directions ↗
Different perspectives make better science. We welcome students from diverse backgrounds, including those with non-traditional paths into physics.
Diversity at RUB ↗