M. Martemianov - KLOE-2 Collaboration

M. Martemianov
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M. Martemianov
KLOE-2 Collaboration

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High Energy Physics - Experiment (24)
Nuclear Experiment (7)
High Energy Physics - Phenomenology (4)
Physics - Instrumentation and Detectors (3)
Quantum Physics (1)
Nuclear Theory (1)

Publications Authored By M. Martemianov

The Dalitz decay pi^0 -> e^+e^-gamma has been measured in the gamma p -> pi^0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the pi^0 electromagnetic transition form factor, a_pi = 0.030+/-0. Read More

An overview of the GW SAID and ITEP groups' effort to analyze pion photoproduction on the neutron-target will be given. The disentanglement of the isoscalar and isovector EM couplings of N* and Delta* resonances does require compatible data on both proton and neutron targets. The final-state interaction plays a critical role in the state-of-the-art analysis in extraction of the gn-->piN data from the deuteron target experiments. Read More

Differential cross sections for the gamma p -> pi^0 p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W=1.9 GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of pi^0 photoproduction data by ~47%. Read More

We report on a measurement of the neutron detection efficiency in NaI crystals in the Crystal Ball detector obtained from a study of single p0 photoproduction on deuterium using the tagged photon beam at the Mainz Microtron. The results were obtained up to a neutron energy of 400 MeV. They are compared to previous measurements made more than 15 years ago at the pion beam at the BNL AGS. Read More

Affiliations: 1KLOE-2 Collaboration, 2KLOE-2 Collaboration, 3KLOE-2 Collaboration, 4KLOE-2 Collaboration, 5KLOE-2 Collaboration, 6KLOE-2 Collaboration, 7KLOE-2 Collaboration, 8KLOE-2 Collaboration, 9KLOE-2 Collaboration, 10KLOE-2 Collaboration, 11KLOE-2 Collaboration, 12KLOE-2 Collaboration, 13KLOE-2 Collaboration, 14KLOE-2 Collaboration, 15KLOE-2 Collaboration, 16KLOE-2 Collaboration, 17KLOE-2 Collaboration, 18KLOE-2 Collaboration, 19KLOE-2 Collaboration, 20KLOE-2 Collaboration, 21KLOE-2 Collaboration, 22KLOE-2 Collaboration, 23KLOE-2 Collaboration, 24KLOE-2 Collaboration, 25KLOE-2 Collaboration, 26KLOE-2 Collaboration, 27KLOE-2 Collaboration, 28KLOE-2 Collaboration, 29KLOE-2 Collaboration, 30KLOE-2 Collaboration, 31KLOE-2 Collaboration, 32KLOE-2 Collaboration, 33KLOE-2 Collaboration, 34KLOE-2 Collaboration, 35KLOE-2 Collaboration, 36KLOE-2 Collaboration, 37KLOE-2 Collaboration, 38KLOE-2 Collaboration, 39KLOE-2 Collaboration, 40KLOE-2 Collaboration, 41KLOE-2 Collaboration, 42KLOE-2 Collaboration, 43KLOE-2 Collaboration, 44KLOE-2 Collaboration, 45KLOE-2 Collaboration, 46KLOE-2 Collaboration, 47KLOE-2 Collaboration, 48KLOE-2 Collaboration, 49KLOE-2 Collaboration, 50KLOE-2 Collaboration, 51KLOE-2 Collaboration, 52KLOE-2 Collaboration, 53KLOE-2 Collaboration, 54KLOE-2 Collaboration, 55KLOE-2 Collaboration, 56KLOE-2 Collaboration, 57KLOE-2 Collaboration, 58KLOE-2 Collaboration, 59KLOE-2 Collaboration, 60KLOE-2 Collaboration, 61KLOE-2 Collaboration, 62KLOE-2 Collaboration, 63KLOE-2 Collaboration, 64KLOE-2 Collaboration, 65KLOE-2 Collaboration, 66KLOE-2 Collaboration, 67KLOE-2 Collaboration, 68KLOE-2 Collaboration, 69KLOE-2 Collaboration

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 $U\to\mu^+\mu^-$. Read More

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. Read More

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. Read More

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. Read More

We report the measurement of the ratio $\Gamma(\eta \to \pi^+\pi^-\gamma)/\Gamma(\eta \to \pi^+\pi^-\pi^0)$ analyzing a large sample of $\phi \to \eta \gamma$ decays recorded with the KLOE experiment at the DA$\Phi$NE $e^+ e^-$ collider, corresponding to an integrated luminosity of 558 pb$^{-1}$. The $\eta \to \pi^+\pi^-\gamma$ process is supposed to proceed both via a resonant contribution, mediated by the $\rho$ meson, and a non resonant direct term, connected to the box anomaly. The presence of the direct term affects the partial width value. Read More

The processes $e^+e^-\to e^+e^-X$, with $X$ being either the $\eta$ meson or $\pi^0\pi^0$, are studied at DA$\Phi$NE, with $e^+e^-$ beams colliding at $\sqrt{s}\simeq1$ GeV, below the $\phi$ resonance peak. The data sample is from an integrated luminosity of 240 pb$^{-1}$, collected by the KLOE experiment without tagging of the outgoing $e^+e^-$. Preliminary results are presented on the observation of the $\gamma\gamma\to\eta$ process, with both $\eta\to\pi^+\pi^-\pi^0$ and $\eta\to\pi^0\pi^0\pi^0$ channels, and the evidence for $\gamma\gamma\to\pi^0\pi^0$ production at low $\pi^0\pi^0$ invariant mass. Read More

We report the first observation of the rare eta->e+e-e+e- decay based on 1.7 fb^{-1} collected by the KLOE experiment at the DAFNE phi-factory. The selection of the e+e-e+e- final state is fully inclusive of radiation. Read More

Authors: D. Babusci, C. Bini, F. Bossi, G. Isidori, D. Moricciani, F. Nguyen, P. Raimondi, G. Venanzoni, D. Alesini, F. Archilli, D. Badoni, R. Baldini-Ferroli, M. Bellaveglia, G. Bencivenni, M. Bertani, M. Biagini, C. Biscari, C. Bloise, V. Bocci, R. Boni, M. Boscolo, P. Branchini, A. Budano, S. A. Bulychjev, B. Buonomo, P. Campana, G. Capon, M. Castellano, F. Ceradini, E. Chiadroni, P. Ciambrone, L. Cultrera, E. Czerwinski, E. Dané, G. Delle Monache, E. De Lucia, T. Demma, G. De Robertis, A. De Santis, G. De Zorzi, A. Di Domenico, C. Di Donato, B. Di Micco, E. Di Pasquale, G. Di Pirro, R. Di Salvo, D. Domenici, A. Drago, M. Esposito, O. Erriquez, G. Felici, M. Ferrario, L. Ficcadenti, D. Filippetto, S. Fiore, P. Franzini, G. Franzini, A. Gallo, G. Gatti, P. Gauzzi, S. Giovannella, A. Ghigo, F. Gonnella, E. Graziani, S. Guiducci, F. Happacher, B. Höistad, E. Iarocci, M. Jacewicz, T. Johansson, W. Kluge, V. V. Kulikov, A. Kupsc, J. Lee Franzini, C. Ligi, F. Loddo, P. Lukin, F. Marcellini, C. Marchetti, M. A. Martemianov, M. Martini, M. A. Matsyuk, G. Mazzitelli, R. Messi, C. Milardi, M. Mirazzita, S. Miscetti, G. Morello, P. Moskal, S. Müeller, S. Pacetti, G. Pancheri, E. Pasqualucci, M. Passera, A. Passeri, V. Patera, A. D. Polosa, M. Preger, L. Quintieri, A. Ranieri, P. Rossi, C. Sanelli, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, M. Serio, F. Sgamma, M. Silarski, B. Spataro, A. Stecchi, A. Stella, S. Stucci, C. Taccini, S. Tomassini, L. Tortora, C. Vaccarezza, R. Versaci, W. Wislicki, M. Wolke, J. Zdebik, M. Zobov

This document reviews the physics program of the KLOE-2 detector at DA$\Phi$NE upgraded in energy and provides a simple solution to run the collider above the $\phi$-peak (up to 2, possibly 2.5 GeV). It is shown how a precise measurement of the multihadronic cross section in the energy region up to 2 (possibly 2. Read More

Investigation at a $\phi$--factory can shed light on several debated issues in particle physics. We discuss: i) recent theoretical development and experimental progress in kaon physics relevant for the Standard Model tests in the flavor sector, ii) the sensitivity we can reach in probing CPT and Quantum Mechanics from time evolution of entangled kaon states, iii) the interest for improving on the present measurements of non-leptonic and radiative decays of kaons and eta/eta$^\prime$ mesons, iv) the contribution to understand the nature of light scalar mesons, and v) the opportunity to search for narrow di-lepton resonances suggested by recent models proposing a hidden dark-matter sector. We also report on the $e^+ e^-$ physics in the continuum with the measurements of (multi)hadronic cross sections and the study of gamma gamma processes. Read More

We have measured the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay, using about 20 million tagged K+ mesons collected with the KLOE detector at DAFNE, the Frascati phi-factory. Signal counts are obtained from the fit of the distribution of the momentum of the charged decay particle in the kaon rest frame. The result, inclusive of final-state radiation, is BR(K+ -> pi+ pi0 (gamma))=0. Read More

KLOE has measured most decay branching ratios of Ks, Kl and K+/- mesons. It has also measured the Kl and the K+- lifetime and determined the shape of the form factors involved in kaon semileptonic decays. We present in the following a description of the above measurements and a well organized compendium of all of our data, with particular attention to correlations. Read More

The total, elastic and inelastic cross-sections for quasi-coherent interactions of protons with Si28 have been measured using hadron-gamma coincidence method at the energy 1 GeV. The limits for the existence of long-lived excited states of the Si28 nucleus have been obtained in the range of energies from 0 to 0.8 GeV. Read More

The A-dependence is observed in $x_F$-distributions for the $\Lambda K^0$ system produced with the small transverse momentum in the neutron-nucleus interactions. For the $\Lambda$ hyperons similar dependence isn't seen. The result is interpreted as an effect from intermediate excitative nucleon state, which decays into strange particles. Read More