Polish Particle and Nuclear Theory Summit (2PiNTS) 2024

In this talk I revisit the time-ordering issue of TMD soft factors based on coordinate-space analyticity properties of Wightman functions in Wightman-Osterwalder-Schrader QFTs.

In particular, I show that the TMD soft factor for the DY process in three rapidity regularization schemes can be smoothly connected to each other in a way that maintains certain crucial equalities required for...

Certain types of large-$N$ gauge theories coupled to matter offer interacting UV fixed points that are under strict perturbative control, beyond the paradigm of asymptotic freedom. In this work, we derive and investigate functional RG equations for the quantum effective potential of the theory to leading order in a derivative expansion. We thereby find the RG flows, fixed points, and scaling...

Self-Interacting Dark Matter models offer a compelling framework for explaining dark matter production through interactions confined within the dark sector. Introducing a feeble coupling between the dark and visible sectors via a Higgs portal not only opens up new avenues for detection and enriches thermal production dynamics but also provides a potential explanation for the initial dark...

The observed pattern of fermion masses and mixing is an outstanding puzzle in particle physics, generally known as the flavor problem. To explain the typical mixing pattern in the neutrino sector, various mixing schemes are proposed, such as trimaximal mixing (TM1 and TM2), $\mu-\tau$ reflection symmetries, etc. Such mixing schemes can emerge within the framework of discrete flavor symmetries,...

The SMEFT provides a general framework to search for new physics beyond the current reach of direct detection. One such form of new physics is quantum gravity. Based on dimensional analysis, one would expect the prediction that the quantum-gravity contribution to the SMEFT coefficients is unmeasurably tiny at LHC scales. In this paper, we test this expectation in a specific framework for...

Our research focuses on an extensive analysis of the dynamics of kink solutions in a modified sine-Gordon model, including a comprehensive study of the effects of breaking translational invariance due to the presence of periodic and localized inhomogeneities.

We present a significant advancement in understanding the behavior of kink solutions within the sine-Gordon model, particularly in...

Motivated by the evidence of spin polarization in particles produced by relativistic heavy ion collisions, there is growing interest in the so-called relativistic spin hydrodynamics. In this talk, we will present the outcomes of using first-principle quantum-statistical methods to derive the expression for the entropy production rate in relativistic fluids composed of particles with spin....

We will discuss the light-front formulation of quarkonium γ∗γ transition
form factors for J PC = 2++ meson states. We will present γ∗γ → χc2 transition amplitudes and the pertinent helicity form factors. We show the results for the two-photon decay width of χc2 and three independent transition form factors of χc2 as a function of photon virtuality Q2. We compare our results for the two-photon...

We calculate differential distributions for diffractive dijets production in $ep→e'p$ jet jet using off-diagonal unintegrated gluon distributions (GTMDs). Different models are used.
We concentrate on the contribution of exclusive $q\bar{q}$ dijets.
The results of our calculations are compared to H1 and ZEUS data. In general, except for one GTMD, our results are below the HERA data. This is...

The particle production at forward rapidities in hadronic collisions is one of the most promising processes to probe the QCD dynamics at small - $x$ as well as to observe the breakdown of the collinear and $k_T$ factorization theorems, predicted to occur to high partonic densities. In this process, one has the interaction between projectile partons with large cone momentum fractions and target...

Exclusive chi_c mesons production in DIS is sensitive to the C-odd colorless exchange at high energy, the Odderon. In our recent work we performed a computation of the chi_cJ (J = 0, 1, 2) exclusive production that takes into account the interference with the photon exchange, which is an irreducible background. We give a prediction of number of events one can expect at the EIC. In the low-t...

In recent years, the study of transverse momentum dependent parton distribution function (TMD) received considerable attention in the literature. The understanding of those distributions may help to the resolution of the proton spin puzzle which is one of the main goals of hadron physics. In this presentation I will highlight the use of the small-x formalism in the context of this puzzle and...