Melih A. Ozcelik

Two-photon transition form factor of the eta_c meson including relativistic and NNLO corrections

Izabela Babiarz, Melih A. Ozcelik, Chris A. Flett, Wolfgang M. Schäfer et autres

Numerical data of the transition form factor of eta_c that serve the reproducibility of results.

pl, fr, be (code pays fourni par la source)

Transition form-factor for $$\eta _Q$$ at NNLO in the strong coupling $$\alpha _s$$ and with all-order $$v^2$$ resummation

Izabela Babiarz, Chris A. Flett, Melih A. Ozcelik, Wolfgang M. Schäfer et autres

Abstract In this work, we discuss both relativistic and perturbative QCD corrections to the transition form-factor $$\mathcal{F}_{\eta _Q}{(t_1,t_2)}$$ F η Q ( t 1 , t 2 ) for the process $$\gamma ^*(q_1) \gamma ^*(q_2) \leftrightarrow \eta _Q(P)$$ γ ∗ ( q …

pl, fr (code pays fourni par la source)

Two-loop form factors for P-wave quarkonium production and decay

Melih A. Ozcelik

A bstract We present the analytical results for the two-loop form factors needed for χ Q , J production and decay. We consider the two-loop corrections to the process $$ \gamma \gamma \leftrightarrow {}^3{P}_J^{\left[1\right]} $$ γγ ↔ P J 1 3 , …

fr (code pays fourni par la source)

Linear power corrections to single top production and decay at the LHC in the narrow width approximation

S. V. Makarov, Kirill Melnikov, Paolo Nason, Melih A. Ozcelik

A bstract We consider top quark production and decay in the narrow width approximation and study if the polarisation effects, that manifest themselves in correlations of angular distributions of particles from top quark decays and final state jets in the production sub-process, …

de, us, it, fr (code pays fourni par la source)

Prospective report of the French QCD community to the ESPPU 2025 with respect to the program of the LHC Run 5 and beyond and future colliders at CERN

C. Arata, François Arleo, B. Audurier, Alberto Baldisseri et autres

This document summarizes the prospective physics plans of the French QCD and Heavy-Ion community, including the experimental programs at the LHC Run 5 and beyond and future colliders at CERN, within the context of the French contribution to the update of the …

fr (code pays fourni par la source)

Curing the high-energy perturbative instability of vector-quarkonium-photoproduction cross sections at order $$\alpha \alpha _s^3$$ with high-energy factorisation

Jean-Philippe Lansberg, Maxim Aleksandrovich Nefedov, Melih A. Ozcelik

Abstract We cure the perturbative instability of the total-inclusive-photoproduction cross sections of vector S-wave quarkonia observed at high photon-proton-collision energies ( $$\sqrt{s_{\gamma p}}$$ s γ p ) in Next-to-Leading Order (NLO) Collinear-Factorisation (CF) computations. This is achieved using High-Energy Factorisation (HEF) in …

fr, pl (code pays fourni par la source)

Linear power corrections to top quark pair production in hadron collisions

S. V. Makarov, Kirill Melnikov, Paolo Nason, Melih A. Ozcelik

A bstract We compute, in the framework of renormalon calculus, the $$ \mathcal{O}\left({\Lambda}_{\textrm{QCD}}\right) $$ O Λ QCD corrections to the production of $$ t\overline{t} $$ t t ¯ pairs in hadron collisions under the assumption that $$ q\overline{q}\to t\overline{t} $$ q q …

ca, it, fr (code pays fourni par la source)

Linear power corrections to top quark pair production in hadron collisions

S. V. Makarov, Kirill Melnikov, Paolo Nason, Melih A. Ozcelik

We compute, in the framework of renormalon calculus, the ${\cal O}(Λ_{\rm QCD})$ corrections to the production of $t\bar{t}$ pairs in hadron collisions under the assumption that $q \bar q \to t \bar t$ is the dominant partonic channel. This assumption is not …

Curing the high-energy perturbative instability of vector-quarkonium-photoproduction cross sections at order $αα_s^3$ with high-energy factorisation

Jean-Philippe Lansberg, Maxim Aleksandrovich Nefedov, Melih A. Ozcelik

We cure the perturbative instability of the total-inclusive-photoproduction cross sections of vector $S$-wave quarkonia observed at high photon-proton-collision energies ($\sqrt{s_{γp}}$) in Next-to-Leading Order (NLO) Collinear-Factorisation (CF) computations. This is achieved using High-Energy Factorisation (HEF) in the Doubly-Logarithmic Approximation (DLA), which is a …

Linear power corrections to single top production processes at the LHC

S. V. Makarov, Kirill Melnikov, Paolo Nason, Melih A. Ozcelik

Abstract We discuss the linear power corrections to the electroweak production of top quarks at the LHC using renormalon calculus. We show how such non-perturbative corrections can be obtained using the Low-Burnett-Kroll theorem, which provides the first subleading term to the expansion …

de, it, fr (code pays fourni par la source)

Two-loop form factors for pseudo-scalar quarkonium production and decay

Samuel Abreu, Matteo Becchetti, Claude Duhr, Melih A. Ozcelik

A bstract We present the analytic expressions for the two-loop form factors for the production or decay of pseudo-scalar quarkonia, in a scheme where the quarks are produced at threshold. We consider the two-loop amplitude for the process $$ \gamma \gamma \leftrightarrow …

ch, gb, it, fr (code pays fourni par la source)

Linear power corrections to single top production processes at the LHC

S. V. Makarov, Kirill Melnikov, Paolo Nason, Melih A. Ozcelik

We discuss the linear power corrections to the electroweak production of top quarks at the LHC using renormalon calculus. We show how such non-perturbative corrections can be obtained using the Low-Burnett-Kroll theorem, which provides the first subleading term to the expansion of …