# Publications: Theoretical Physics

### Published Articles

**Machine learning determination of dynamical parameters: The Ising model case**, *Physical Review B (2019)*

G. Cossu, L. Del Debbio, T. Giani, A. Khamseh, M. Wilson

**The decay constants $f_D$ and $f_{D_s}$ in the continuum limit of $N_f = 2 + 1$ domain wall lattice QCD**, *JHEP (2017)*

P. Boyle, L. Del Debbio, A. Juettner, A. Khamseh, F. Sanfilippo, T. Tsang, (RBC and UKQCD Collaborations)

**A massive momentum-subtraction scheme**, *Physical Review D (2017)*

P. Boyle, L. Del Debbio, A. Khamseh

### Conference Proceedings

**Beyond the Standard Model Kaon Mixing with Physical Masses**, *PoS LATTICE 2018 (2019)*

P. Boyle, N. Garron, R. J. Hudspith, A. Juettner, J. Kettle, A. Khamseh, J. T. Tsang, (RBC and UKQCD Collaborations)

**Heavy Domain Wall Fermions: The RBC and UKQCD charm physics program**, *PoS LATTICE 2017 (2018)*

P. Boyle, L. Del Debbio, A. Juettner, A. Khamseh, T. Tsang, O. Witzel, (RBC and UKQCD Collaborations)

**BSM Kaon Mixing at the Physical Point**, *PoS LATTICE 2017 (2018)*

P. Boyle, N. Garron, J. Kettle, A. Khamseh, T. Tsang, (RBC and UKQCD Collaborations)

**A massive momentum-subtraction scheme**, *PoS LATTICE 2016 (2017)*

P. Boyle, L. Del Debbio, A. Khamseh

**Charm Physics with Domain Wall Fermions and Physical Pion Masses**, *PoS LATTICE 2016 (2017)*

P. Boyle, L. Del Debbio, A. Juettner, A. Khamseh, F. Sanfilippo, T. Tsang, Oliver Witzel, (RBC and UKQCD Collaborations)

**Domain Wall Charm Physics with Physical Pion Masses: Decay Constants, Bag and $\xi$ Parameters**, *PoS LATTICE 2015 (2016)*

P. Boyle, L. Del Debbio, A. Juettner, A. Khamseh, F. Sanfilippo, T. Tsang, (RBC and UKQCD Collaborations)

**Charm physics with physical light and strange quarks using domain wall fermions**, *PoS LATTICE 2014 (2015)*

P. Boyle, L. Del Debbio, N. Garron, A. Juettner, A. Khamseh, M. Marinkovic, F. Sanfilippo, T. Tsang, (RBC and UKQCD Collaborations)

### Lecture notes

**Energy Levels Of Hydrogen Atom Using Ladder Operators**

In the quantum mechanics courses, the energy levels of the Simple Harmonic Oscillator (SHO) are derived using both the Schrödinger wave function and the Ladder operator methods, while the energy levels of the Hydrogen atom are examined using the former method only. Here we derive the same results for the Hydrogen atom by using the Ladder operator method.

A. Khamseh, B. Pendleton

**Representations of the Poincare Group**

Special relativity postulates the invariance of physical phenomena under the Poincaré group. As a consequence elementary states in high-energy physics are classified by its irreducible representations. In the following, the classification of the representations of the Poincaré group and the corresponding physical states have been studied from two different points of view: Quantum mechanics and Field Theory.

A. Khamseh, L. Del Debbio

**Derivation of Virasoro Algebra from Dilatation Invariance**

This mini-project is based on Martin Lüscher’s talk (Munich, December 1988). For the original material please refer to Martin Lüscher’s own webpage. Here I have tried to include the details of most derivations as well as some explanations that might be beneficial for other students. The aim here is to show that in 2-dimensions, dilatation invariance plus the existence of an energy-momentum tensor implies general conformal invariance on the level of the field algebra.

A. Khamseh, L. Del Debbio