| 1. |
- Anchordoqui, Luis A., et al.
(författare)
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The Forward Physics Facility : Sites, experiments, and physics potential
- 2022
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Ingår i: Physics reports. - : Elsevier. - 0370-1573 .- 1873-6270. ; 968, s. 1-50
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Tidskriftsartikel (refereegranskat)abstract
- The Forward Physics Facility (FPF) is a proposal to create a cavern with the space and infrastructure to support a suite of far-forward experiments at the Large Hadron Collider during the High Luminosity era. Located along the beam collision axis and shielded from the interaction point by at least 100 m of concrete and rock, the FPF will house experiments that will detect particles outside the acceptance of the existing large LHC experiments and will observe rare and exotic processes in an extremely low-background environment. In this work, we summarize the current status of plans for the FPF, including recent progress in civil engineering in identifying promising sites for the FPF and the experiments currently envisioned to realize the FPF's physics potential. We then review the many Standard Model and new physics topics that will be advanced by the FPF, including searches for long-lived particles, probes of dark matter and dark sectors, high-statistics studies of TeV neutrinos of all three flavors, aspects of perturbative and non-perturbative QCD, and high-energy astroparticle physics.
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| 2. |
- Babiarz, Izabela, et al.
(författare)
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Central exclusive production of scalar and pseudoscalar charmonia in the light-front kT -factorization approach
- 2020
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Ingår i: Physical Review D. - 2470-0010. ; 102:11
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Tidskriftsartikel (refereegranskat)abstract
- We study exclusive production of scalar χc0χc(0++) and pseudoscalar ηc charmonia states in proton-proton collisions at the LHC energies. The amplitudes for gg→χc0 as well as for gg→ηc mechanisms are derived in the kT-factorization approach. The pp→ppηc reaction is discussed for the first time. We have calculated rapidity, transverse momentum distributions, and such correlation observables as the distribution in relative azimuthal angle and (t1,t2) distributions. The latter two observables are very different for χc0 and ηc cases. In contrast to the inclusive production of these mesons considered very recently in the literature, in the exclusive case, the cross section for ηc is much lower than that for χc0, which is due to a special interplay of the corresponding vertices and off-diagonal unintegrated gluon distributions used to calculate the cross sections. We present the numerical results for the key observables in the framework of potential models for the light-front quarkonia wave functions. We also discuss how different the absorptive corrections are for both considered cases.
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| 3. |
- Babiarz, Izabela, et al.
(författare)
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Hadroproduction of scalar P -wave quarkonia in the light-front kT -factorization approach
- 2020
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Ingår i: Journal of High Energy Physics. - 1126-6708. ; 2020:6
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Tidskriftsartikel (refereegranskat)abstract
- In this work, we present a thorough analysis of scalar P -wave χQ0, Q = c, b quarkonia electromagnetic form factors for the γ∗γ∗→ χQ0 couplings, as well as their hadroproduction observables in k⊥-factorisation using the light-front (LF) potential approach for the quarkonium wave function. The electromagnetic form factors are presented as functions of photon virtualities. We discuss the role of the Melosh spin-rotation and relativistic corrections estimated by comparing our results with those in the standard nonrelativistic QCD (NRQCD) approach. Theoretical uncertainties of our approach are found by performing the analysis with two different unintegrated gluon densities and with five distinct models of the QQ¯ interaction potentials consistent with the meson spectra. The results for the rapidity and transverse momentum distributions of χQ0 produced in high-energy pp collisions at s = 13 TeV are shown.
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| 4. |
- Babiarz, Izabela, et al.
(författare)
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Light-front approach to axial-vector quarkonium γ * γ * form factors
- 2022
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Ingår i: Journal of High Energy Physics. - 1029-8479. ; 2022:9
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Tidskriftsartikel (refereegranskat)abstract
- In this work, we perform a detailed study of transition form factors for axial- vector meson production via the two-photon fusion process γ*γ* → 1++, with space-like virtual photons in the initial state and a P-wave axial-vector quarkonium in the final state. In this analysis, we employ the formalism of light-front quarkonium wave functions obtained from a solution of the Schrödinger equation for a selection of interquark potentials for QQ¯ interaction. We found the helicity structure and covariant decomposition of the matrix elements that can be generically applied for any qq¯ axial-vector meson γ*γ* → 1++ transition, while our numerical results are given for the phenomenologically relevant charmonium χc1 state. We present the helicity form factors as functions of both photon virtualities. We also obtain, that QFLT(Q2, 0)/FTT(Q2, 0) = const.
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| 5. |
- Babiarz, Izabela, et al.
(författare)
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Probing the structure of χc1 (3872) with photon transition form factors
- 2023
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Ingår i: Physical Review D. - 2470-0010. ; 107:7
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Tidskriftsartikel (refereegranskat)abstract
- We propose studying the structure of the χc1(3872) axial vector meson through its γL∗γ→χc1(3872) transition form factor. We derive a light-front wave function representation of the form factor for the lowest cc¯ Fock state. We found that the reduced width of the state is well within the current experimental bound recently published by the Belle Collaboration. This strongly suggests a crucial role of the cc¯ Fock-state in the photon-induced production. Our results for the Q2 dependence can be tested by future single-tagged e+e- experiments, giving further insight into the short-distance structure of this meson.
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| 6. |
- Babiarz, Izabela, et al.
(författare)
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Prompt hadroproduction of ηc(1S, 2S) in the kT-factorization approach
- 2020
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Ingår i: Journal of High Energy Physics. - 1029-8479. ; 2020:2
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Tidskriftsartikel (refereegranskat)abstract
- In this work, we present a thorough analysis of ηc(1S, 2S) quarkonia hadroproduction in k⊥-factorisation in the framework of the light-front potential approach for the quarkonium wave function. The off-shell matrix elements for the g*g*ηc(1S, 2S) vertices are derived. We discuss the importance of taking into account the gluon virtualities. We present the transverse momentum distributions of ηc for several models of the unintegrated gluon distributions. Our calculations are performed for four distinct parameterisations for the cc¯ interaction potential consistent with the meson spectra. We compare our results for ηc(1S) to measurements by the LHCb collaboration and present predictions for ηc(2S) production.
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| 7. |
- Babiarz, Izabela, et al.
(författare)
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The γ∗γ∗→ ηc (1S; 2S) transition form factor from quarkonium wave functions
- 2019
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Ingår i: PHOTON 2019 - International Conference on the Structure and the Interactions of the Photon. - 1122-5157. - 9788886409704 ; 69, s. 95-100
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Konferensbidrag (refereegranskat)abstract
- We discuss γ ∗γ ∗→ ηc(1S) ; ηc (2S) transition form factor for both virtual photons. The general formula is given. We use difierent models for the cc̄ wave function obtained from the solution of the Schrödinger equation for diffierent cc̄ potentials: harmonic oscillator, Cornell, logarithmic, power-law, Coulomb and Buchmüller{Tye. We showed some examples of wave functions in the Light Front representation as well as in the rest frame of cc̄. We compare our results to the BaBar experimental data for ηc(1S), with one real and one virtual photon, and to the values collected by the Particle Data Group for the form factor F(0; 0), decay width τγ γ and decay constant fηc . We also consider the non-relativistic limit for F(0; 0) with the wave function evaluated at the origin R(0).
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| 8. |
- Babiarz, Izabela, et al.
(författare)
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The γ∗γ∗ → ηc(1S,2S) transition form factors for two spacelike photons
- 2019
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Ingår i: European Physical Society Conference on High Energy Physics (EPS-HEP2019). - Trieste, Italy : Sissa Medialab. - 1824-8039. ; 364
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Konferensbidrag (refereegranskat)abstract
- We discuss γ∗γ∗ → ηc(1S), ηc(2S) transition form factors for both virtual photons. The general formula is given. We use different models for the cc¯ wave function obtained from the solution of the Schrödinger equation for different cc¯ potentials: harmonic oscillator, Cornell, logarithmic, power-law, Coulomb and Buchmüller-Tye. We showed some examples of wave functions in the Light Front representation as well as in the rest frame of cc¯ pair. We compare our results to the BaBar experimental data for ηc(1S), for one real and one virtual photon, and to the values collected by the Particle Data Group for F(0,0), decay width Γγγ and decay constant fηc. We also considered the non-relativistic limit for F(0,0) form factor with the wave function at the origin R(0).
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| 9. |
- Babiarz, Izabela, et al.
(författare)
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γ∗γ∗ →ηc (1S,2S) transition form factors for spacelike photons
- 2019
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Ingår i: Physical Review D. - 2470-0010. ; 100:5
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Tidskriftsartikel (refereegranskat)abstract
- We derive the light-front wave function (LFWF) representation of the γ∗γ∗→ηc(1S),ηc(2S) transition form factor F(Q12,Q22) for two virtual photons in the initial state. For the LFWF, we use different models obtained from the solution of the Schrödinger equation for a variety of cc̄ potentials. We compare our results to the BABAR experimental data for the ηc(1S) transition form factor, for one real and one virtual photon. We observe that the onset of the asymptotic behavior is strongly delayed and discuss applicability of the collinear and/or massless limit. We present some examples of two-dimensional distributions for F(Q12,Q22). A factorization breaking measure is proposed and factorization breaking effects are quantified and shown to be almost model independent. Factorization is shown to be strongly broken, and a scaling of the form factor as a function of Q̄2=(Q12+Q22)/2 is obtained.
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| 10. |
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