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Your search keyword '"Balwierz Pytko, I."' showing total 10 results
Start Over Author "Balwierz Pytko, I." Publication Type Reports
10 results on '"Balwierz Pytko, I."'

1. Study of Dalitz decay phi -> eta e+e- with KLOE detector

Author

Babusci, D., Balwierz-Pytko, I., Bencivenni, G., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkestahl, L. Caldeira, Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., Dane', E., De Leo, V., De Lucia, E., De Robertis, G., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjold, L., Hoistad, B., Johansson, T., Kaminska, D., Krzemien, W., Kupsc, A., Lee-Franzini, J., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Palladino, A., Passeri, A., Longhi, V. Patera. Prado, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, M.

Subjects
High Energy Physics - Experiment
Abstract

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 is used to determine the transition form factor by a fit to the e+e- invariant mass spectrum, obtaining b(phi eta) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations., Comment: 13 pages, 6 figures, submitted to PLB

Published
2014
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2. Search for light vector boson production in $e^+e^- \rightarrow \mu^+ \mu^- \gamma$ interactions with the KLOE experiment

Author

Babusci, D., Balwierz-Pytko, I., Bencivenni, G., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkeståhl, L. Caldeira, Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., Danè, E., De Leo, V., De Lucia, E., De Robertis, G., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjold, L., Hoistad, B., Johansson, T., Kacprzak, K., Kaminska, D., Krzemien, W., Kupsc, A., Lee-Franzini, J., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Palladino, A., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Tortora, L., Venanzoni, G., Wislicki, W., Wolke, M., and Zdebik, J.

Subjects
High Energy Physics - Experiment
Abstract

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 \epm\ collider, motivated by astrophysical evidence for the presence of dark matter in the universe. Using \epm\ collisions collected with an integrated luminosity of $239.3$~pb$^{-1}$, we look for a dimuon mass peak in the reaction \epm\to$\mu^+ \mu^-$\gam, corresponding to the decay $U\to\mu^+\mu^-$. We find no evidence for a $U$ vector boson signal. We set a 90\% CL upper limit for the mixing parameter squared between the photon and the $U$ boson of 1.6$\times$10$^{-5}$ to 8.6$\times$10$^{-7}$ for the mass region $520

Published
2014
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3. Test of CPT and Lorentz symmetry in entangled neutral kaons with the KLOE experiment

Author

Collaboration, KLOE-2, Babusci, D., Balwierz-Pytko, I., Bencivenni, G., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkestahl, L. Caldeira, Capon, G., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., Danè, E., De Leo, V., De Lucia, E., De Robertis, G., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Donato, C., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjold, L., Hoistad, B., Jacewicz, M., Johansson, T., Kacprzak, K., Kaminska, D., Kupsc, A., Lee-Franzini, J., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Palladino, A., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Taccini, C., Tortora, L., Venanzoni, G., Wislicki, W., Wolke, M., and Zdebik, J.

Subjects
High Energy Physics - Experiment
Abstract

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 perform a measurement of the CPT-violating parameters Delta_amu for neutral kaons in the contest of the Standard Model Extension framework. The parameters measured in the reference frame of the fixed stars are: Delta_ao = (-6.0 +- 7.7_{stat} +- 3.1_{syst}) x 10^{-18} GeV Delta_ax = ( 0.9 +- 1.5_{stat} +- 0.6_{syst}) x 10^{-18} GeV Delta_ay = (-2.0 +- 1.5_{stat} +- 0.5_{syst}) x 10^{-18} GeV Delta_az = ( 3.1 +- 1.7_{stat} +- 0.5_{syst}) x 10^{-18} GeV These are presently the most precise measurements in the quark sector of the Standard Model Extension., Comment: 16 pages, 6 figures, added few typo corrections

Published
2013
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4. MesonNet 2013 International Workshop. Mini-proceedings

Author

Amaryan, M. J., Bashkanov, M., Benayoun, M., Bergmann, F., Bijnens, J., Balkestahl, L. Caldeira, Clement, H., Colangelo, G., Daub, J., Eidelman, S., Fang, S., Gajos, A., Giovannella, S., Goudzovski, E., Grzonka, D., Gullström, C. O., Gumberidze, M., Heijkenskjöld, L., Hejny, V., Hoferichter, M., Husek, T., Ikeno, N., Ivashyn, S., Johansson, T., Kadavý, T., Kampf, K., Kolesár, M., Kupsc, A., Lang, M., Lorenz, M., Lutz, M. F. M., Machner, H., Masjuan, P., Metag, V., Moussallam, B., Nagahiro, H., Nanova, M., Niecknig, F., Papenbrock, M., Peña, M. T., Pettersson, J., Longhi, I. Prado, Prencipe, E., Balwierz-Pytko, I., Przygoda, W., Redmer, C. F., Sarra, I., Sawant, S., Schneider, S. P., Shwartz, B., Skurzok, M., Tanaka, Y. K., Terschlüsen, C., Unverzagt, M., Yamagata-Sekihara, J., Zdráhal, M., and Zétényi, M.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment, Nuclear Experiment, Nuclear Theory
Abstract

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, Comment: 106 pages, 53 contributions. Mini-proceedings of the MesonNet 2013 International Workshop. Editors: K. Kampf, A. Kupsc, and P. Masjuan

Published
2013

5. Recent results on hadron physics at KLOE

Author

Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkest, L. Caldeira, Capon, G., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., Dane, E., De Leo, V., De Lucia, E., De Robertis, G., De Santis, A., Di Domenico, A., Di Donato, C., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjold, L., Hoistad, B., Iafolla, L., Jacewicz, M., Johansson, T., Kacprzak, K., Kupsc, A., Lee-Franzini, J., Leverington, B., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Palladino, A., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Redmer, C. F., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Taccini, C., Tortora, L., Venanzoni, G., Wislicki, W., Wolke, M., and Zdebik, J.

Subjects
High Energy Physics - Experiment
Abstract

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 contribution includes brief description of results of recent analysis of the KLOE data aimed at (i) the search for the dark matter boson, (ii) determination of the hadronic and light-by-light contributions to the g-2 muon anomaly and (iii) tests of QCD anomalies., Comment: 4 pages, Proceedings of the 48th Rencontres de Moriond "QCD and High Energy Interactions", La Thuile, Italy, March 9-16, 2013

Published
2013

6. A new limit on the CP violating decay KS -> 3pi0 with the KLOE experiment

Author

Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkestahl, L. Caldeira, Capon, G., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., Dane, E., De Leo, V., De Lucia, E., De Robertis, G., De Santis, A., Di Domenico, A., Di Donato, C., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gauzzi, P., Giardina, G., Giovannella, S., Gonnella, F., Graziani, E., Happacher, F., Heijkenskjold, L., Hoistad, B., Iafolla, L., Jacewicz, M., Johansson, T., Kacprzak, K., Kupsc, A., Lee-Franzini, J., Leverington, B., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Redmer, C. F., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Taccini, C., Tortora, L., Venanzoni, G., Wislicki, W., Wolke, M., and Zdebik, J.

Subjects
High Energy Physics - Experiment
Abstract

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 respect to our previous search, the analysis has been improved by increasing of a factor four the tagged sample and by a more effective background rejection of fake KS tags and spurious clusters. We find no candidates in data and simulated background samples, while we expect 0.12 standard model events. Normalizing to the number of KS -> 2pi0 events in the same sample, we set the upper limit on BR(KS -> 3pi0 < 2.6 x 10^-8 at 90% C.L., five times lower than the previous limit. We also set the upper limit on the eta_000 parameter, |eta_000 | < 0.0088 at 90% C.L., improving by a factor two the latest direct measurement., Comment: Accepted for publication in Physics Letters B (15 pages, 13 figures)

Published
2013
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7. Precision measurement of $\sigma(e^+e^-\rightarrow\pi^+\pi^-\gamma)/\sigma(e^+e^-\rightarrow \mu^+\mu^-\gamma)$ and determination of the $\pi^+\pi^-$ contribution to the muon anomaly with the KLOE detector

Author

KLOE, Collaborations, KLOE-2, Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkestahl, L. Caldeira, Capon, G., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., Dane', E., De Leo, V., De Lucia, E., De Robertis, G., De Santis, A., De Simone, P., Di Domenico, A., Di Donato, C., Domenici, D., Erriquez, O., Fanizzi, G., Felici, G., Fiore, S., Franzini, P., Gauzzi, P., Giardina, G., Giovannella, S., Gonnella, F., Graziani, E., Happacher, F., Heijkenskjold, L., Hoistad, B., Iafolla, L., Iarocci, E., Jacewicz, M., Johansson, T., Kluge, W., Kupsc, A., Lee-Franzini, J., Loddo, F., Lukin, P., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Muller, S., Nguyen, F., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Redmer, C. F., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Taccini, C., Tortora, L., Venanzoni, G., Versaci, R., Wislicki, W., Wolke, M., and Zdebik, J.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

We have measured the ratio $\sigma(e^+e^-\rightarrow\pi^+\pi^-\gamma)/\sigma(e^+e^-\rightarrow \mu^+\mu^-\gamma)$, with the KLOE detector at DA$\Phi$NE for a total integrated luminosity of $\sim$ 240 pb$^{-1}$. From this ratio we obtain the cross section $\sigma(e^+e^-\rightarrow\pi^+\pi^-)$. From the cross section we determine the pion form factor $|F_\pi|^2$ and the two-pion contribution to the muon anomaly $a_\mu$ for $0.592

Published
2012
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8. Measurement of {\eta} meson production in {\gamma}{\gamma} interactions and {\Gamma}({\eta}-->{\gamma}{\gamma}) with the KLOE detector

Author

Collaboration, KLOE-2, Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkestaahl, L. Caldeira, Capon, G., Ceradini, F., Ciambrone, P., Czerwinski, E., Dane, E., De Lucia, E., De Robertis, G., De Santis, A., Di Domenico, A., Di Donato, C., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gauzzi, P., Giardina, G., Giovannella, S., Gonnella, F., Graziani, E., Happacher, F., Heijkenskj, L., Hoistad, B., Iafolla, L., Jacewicz, M., Johansson, T., Kupsc, A., Lee-Franzini, J., Leverington, B., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Redmer, C. F., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Taccini, C., Tortora, L., Venanzoni, G., Wislicki, W., Wolke, M., and Zdebik, J.

Subjects
High Energy Physics - Experiment
Abstract

We present a measurement of {\eta} 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 \phi-factory DA{\Phi}NE with an integrated luminosity of 0.24 fb^{-1}. The e^+e^- --> e^+e^-{\eta} cross section is measured without detecting the outgoing electron and positron, selecting the decays {\eta}-->{\pi}^+{\pi}^-{\pi}^0 and {\eta}-->{\pi}^0{\pi}^0{\pi}^0. The most relevant background is due to e^+e^- --> {\eta}{\gamma} when the monochromatic photon escapes detection. The cross section for this process is measured as {\sigma}(e^+e^- -->{\eta}{\gamma}) = (856 \pm 8_{stat} \pm 16_{syst}) pb. The combined result for the e^+e^- -->e^+e^-{\eta} cross section is {\sigma}(e^+e^- -->e^+e^-{\eta}) = (32.72 \pm 1.27_{stat} \pm 0.70_{syst}) pb. From this we derive the partial width {\Gamma}({\eta}-->{\gamma}{\gamma}) = (520 \pm 20_{stat} \pm 13_{syst}) eV. This is in agreement with the world average and is the most precise measurement to date., Comment: Version accepted by JHEP

Published
2012
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9. Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector

Author

Collaboration, KLOE-2, Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkestaahl, L. Caldeira, Capon, G., Ceradini, F., Ciambrone, P., Czerwinski, E., Dane, E., De Lucia, E., De Robertis, G., De Santis, A., Di Domenico, A., Di Donato, C., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gauzzi, P., Giardina, G., Giovannella, S., Gonnella, F., Graziani, E., Happacher, F., Heijkenskj, L., Hoistad, B., Iafolla, L., Jacewicz, M., Johansson, T., Kupsc, A., Lee-Franzini, J., Leverington, B., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Redmer, C. F., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Taccini, C., Tortora, L., Venanzoni, G., Wislicki, W., Wolke, M., and Zdebik, J.

Subjects
High Energy Physics - Experiment
Abstract

We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi --> eta U, U --> e+ e-, analyzing the decay eta --> pi0 pi0 pi0 in a data sample of 1.7 fb-1. No structures are observed in the e+e- invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta --> pi+ pi- pi0, increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7x10^-5 for 30

Published
2012
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10. Measurement of \Gamma(\eta -> \pi^+\pi^-\gamma)/\Gamma(\eta -> \pi^+\pi^-\pi^0) with the KLOE Detector

Author

Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., Bocci, V., Bossi, F., Branchini, P., Budano, A., Balkest, L. Caldeira, Capon, G., Ceradini, F., Ciambrone, P., Czerwinski, E., Dane, E., De Lucia, E., De Robertis, G., De Santis, A., De Simone, P., Di Domenico, A., Di Donato, C., Di Micco, B., Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gauzzi, P., Giardina, G., Giovannella, S., Gonnella, F., Graziani, E., Happacher, F., Hoistad, B., Iafolla, L., Jacewicz, M., Johansson, T., Kupsc, A., Lee-Franzini, J., Leverington, B., Loddo, F., Loffredo, S., Mandaglio, G., Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Passeri, A., Patera, V., Longhi, I. Prado, Ranieri, A., Redmer, C. F., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Taccini, C., Tortora, L., Venanzoni, G., Versaci, R., Wislicki, W., Wolke, M., Xu, G., and Zdebik, J.

Subjects
High Energy Physics - Experiment
Abstract

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 a non-resonant direct term, connected to the box anomaly. Our result, R_{\eta}= 0.1856\pm 0.0005_{stat} \pm 0.0028_{syst}, points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the \eta -> \pi^+\pi^-\gamma decay could be described in a model-independent approach in terms of a single free parameter, \alpha. The determined value of the parameter \alpha is \alpha = (1.32 \pm 0.08_{stat} +0.10/-0.09_{syst}\pm 0.02_{theo}) GeV^{-2}, Comment: Paper in press, accepted by PLB

Published
2012
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