Izabela Pytko

University of Zurich | UZH

Background Definitive chemoradiotherapy (CRT) is standard of care for nasopharyngeal carcinoma. Due to the tumor localization and concomitant platinum-based chemotherapy, hearing impairment is a frequent complication, without defined dose-threshold. In this study, we aimed to achieve the maximum possible cochleae sparing. Materials and methods Tre...

Introduction The use of cranial re-irradiation is growing with improving overall survival and the advent of high-precision radiotherapy techniques. Still the value of re-irradiation needs careful evaluation regarding safety and efficacy. We analyzed dosimetric and clinical data of patients receiving cranial re-irradiation using EQD2 sum plans. Met...

Introduction Thoracic re-irradiation remains a challenge regarding the balance of local efficacy and acceptable toxicities. In this retrospective analysis we analyzed dosimetrical and clinical data of patients treated with thoracic re-irradiation based on accumulated EQD2Gy doses. Methods and Material We retrospectively analyzed the data of 42 con...

Background and purpose: The objective of this study was to compare the latest respiratory motion-management strategies, namely the internal-target-volume (ITV) concept, the mid-ventilation (MidV) principle, respiratory gating and dynamic couch tracking. Materials and methods: An anthropomorphic, deformable and dynamic lung phantom was used for t...

The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics and a persistent discrepancy of about 3 σ between standard model (SM) prediction and the experimental measurement has been observed. The leading order contribution is actually the main source of uncertainty in the theoretical evaluation of the mu...

We have studied the vector to pseudoscalar conversion decay phi -> eta e+e-, with eta -> pi0pi0pi0, with the KLOE detector at DAPHNE. The data set of 1.7 fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decay signal of ~31,000 events from which we measured a value of BR(phi -> eta e+e-)=(1.075+-0.007+-0.038)x10-4. The same sample...

Measurement of the absolute branching ratio of the K + → π + π − π + (γ) decay with the KLOE detector KLOE/KLOE-2 Collaboration The absolute branching ratio of the K + → π + π − π + (γ) decay, inclusive of final-state radiation, has been measured using ∼ 17 million tagged K + mesons collected with the KLOE detector at DANE, the Frascati φ-factory....

We have searched for a light vector boson U, the possible carrier of a “dark force”, with the KLOE detector at the DAFNE e+e−collider, motivated by astrophysical evidence for the presence of dark matter in the Universe. Using e+e−collisions collected with an integrated luminosity of 239.3pb−1, we look for a dimuon mass peak in the reaction e+e−→μ+μ...

We have searched for a light vector boson $U$, the possible carrier of a "dark force", with the KLOE detector at the DA$\Phi$NE $e^+e^-$ collider, motivated by the astrophysical evidence for the presence of "dark matter" in the universe. Using $e^+e^-$ collisions collected for an integrated luminosity of $239.3$~pb$^{-1}$, we look for a dimuon mass...

We have searched for a light vector boson U, the possible carrier of a “dark force”, with the KLOE detector at the DAΦNE e+e− collider, motivated by the astrophysi- cal evidence for the presence of “dark matter” in the universe. Using e+e− collisions collected for an integrated luminosity of 239. 3 pb−1, we look for a dimuon mass peak in the reacti...

Neutral kaon pairs produced in phi decays in anti-symmetric entangled state can be exploited to search for violation of CPT symmetry and Lorentz invariance. We present an analysis of the CP-violating process phi->K_S K_L->pi+pi-pi+pi- based on 1.7 fb-1 of data collected by the KLOE experiment at the Frascati phi-factory DAFNE. The data are used to...

Neutral kaons produced in the correlated pairs at the DAFNE phi-factory offer unique possibilities to perform fundamental tests of CPT invariance, as well as of the basic principles of quantum mechanics. The analysis of the data collected by the KLOE experiment allows to improve results on several parameters describing CPT violation and decoherence...

The mini-proceedings of the MesonNet 2013 International Workshop held in Prague from June 17th to 19th, 2013, are presented. MesonNet is a research network within EU HadronPhysics3 project (1/2012 -- 12/2014). The web page of the conference, which contains all talks, can be found at http://ipnp.mff.cuni.cz/mesonnet13.

One of the basic motivations of the KLOE and KLOE-2 collaborations is the test of fundamental symmetries and the search for phenomena beyond the Standard Model via the hadronic and leptonic decays of ground-state mesons and via their production in the fusion of virtual gamma quanta exchanged between colliding electrons and positrons. This contribut...

We have carried out a new direct search for the CP violating decay KS -> 3pi0 with 1.7 fb^-1 of e+e- collisions collected by the KLOE detector at the phi-factory DAFNE. We have searched for this decay in a sample of about 5.9 x 10^8 KS KL events tagging the KS by means of the KL interaction in the calorimeter and requiring six prompt photons. With...

We have measured the ratio σ ( e + e − → π + π − γ ) / σ ( e + e − → μ + μ − γ ) , with the KLOE detector at DAΦNE for a total integrated luminosity of ∼ 240 pb − 1 . From this ratio we obtain the cross section σ ( e + e − → π + π − ) . From the cross section we determine the pion form factor | F π | 2 and the two-pion contribution to the muon anom...

We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAΦNE. This boson, called U, has been searched for in the decay ϕ → η U , U → e + e − , analyzing the decay η → π 0 π 0 π 0 in a data sample of 1.7 fb − 1 . No structures are observed in the e + e − invariant mass distribution over the background. This...

A bstract We present a measurement of η meson production in photon-photon interactions produced by electron-positron beams colliding with $ \sqrt{s}=1 $ GeV. The measurement is done with the KLOE detector at the ϕ -factory DAΦNE with an integrated luminosity of 0.24 fb ⁻¹ . The e ⁺ e ⁻ → e ⁺ e ⁻ η cross section is measured without detecting the out...

We present a measurement of $\eta$ meson production in photon-photon interac- tions produced by electron-positron beams colliding with √s = 1GeV. The measurement is done with the KLOE detector at the φ-factory DA�NE with an integrated luminosity of 0.24 fb−1. The e+e− → e+e−η cross section is measured without detecting the out- going electron and p...

The ratio R_{\eta}=\Gamma(\eta -> \pi^+\pi^-\gamma)/\Gamma(\eta -> \pi^+\pi^-\pi^0) has been measured by analyzing 22 million \phi \to \eta \gamma decays collected by the KLOE experiment at DA\PhiNE, corresponding to an integrated luminosity of 558 pb^{-1}. The \eta \to \pi^+\pi^-\gamma proceeds both via the \rho resonant contribution, and possibly...