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25 results on '"U boson"'

1. Limit on the production of a low-mass vector boson in e+e−→Uγ, U→e+e− with the KLOE experiment

Author

A. Anastasi, D. Babusci, G. Bencivenni, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, A. D'Uffizi, A. Fantini, G. Felici, S. Fiore, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjöld, W. Ikegami Andersson, T. Johansson, D. Kamińska, W. Krzemien, A. Kupsc, S. Loffredo, G. Mandaglio, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, A. Palladino, M. Papenbrock, A. Passeri, V. Patera, E. Perez del Rio, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, M. Silarski, F. Sirghi, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Dark matter, Dark forces, Dark photon, U boson, A′, Physics, QC1-999
Abstract

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DAΦNE e+e− collider. Using an integrated luminosity of 1.54 fb−1, we studied the process e+e−→Uγ, with U→e+e−, using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, ε2, at 10−6–10−4 in the 5–520 MeV/c2 mass range.

Published
2015
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2. Search for dark Higgsstrahlung in e+e−→μ+μ− and missing energy events with the KLOE experiment

Author

A. Anastasi, D. Babusci, G. Bencivenni, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, A. D'Uffizi, A. Fantini, G. Felici, S. Fiore, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjöld, W. Ikegami Andersson, T. Johansson, D. Kamińska, W. Krzemien, A. Kupsc, S. Loffredo, G. Mandaglio, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, F. Nguyen, A. Palladino, A. Passeri, V. Patera, E. Perez del Rio, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, M. Silarski, F. Sirghi, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Dark matter, Dark forces, U boson, Upper limit, Higgsstrahlung, Physics, QC1-999
Abstract

We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h′, with the KLOE detector at DAΦNE. We investigated the case of h′ lighter than U, with U decaying into a muon pair and h′ producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2mμ

Published
2015
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3. Search for light vector boson production in e+e−→μ+μ−γ interactions with the KLOE experiment

Author

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

Subjects
Dark matter, Dark forces, U boson, Physics, QC1-999
Abstract

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 astrophysical evidence for the presence of dark matter in the Universe. Using e+e− collisions collected with an integrated luminosity of 239.3 pb−1, we look for a dimuon mass peak in the reaction e+e−→μ+μ−γ, corresponding to the decay U→μ+μ−. 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 1.6×10−5 to 8.6×10−7 for the mass region 520

Published
2014
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4. Limit on the production of a new vector boson in e+e− → Uγ, U → π+π− with the KLOE experiment.

Subjects
*SYMMETRY breaking, *GAUGE bosons, *DARK matter, *PHOTONS, *BRANCHING ratios
Abstract

The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, ε 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones. [ABSTRACT FROM AUTHOR]

Published
2016
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5. Limit on the production of a low-mass vector boson in [formula omitted], [formula omitted] with the KLOE experiment.

Author

Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., and De Simone, P.

Subjects
*BOSONS, *INTERACTING boson models, *DARK matter, *METAPHYSICAL cosmology, *MISSING mass problem (Astronomy)
Abstract

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DAΦNE e + e − collider. Using an integrated luminosity of 1.54 fb − 1 , we studied the process e + e − → U γ , with U → e + e − , using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, ε 2 , at 10 − 6 – 10 − 4 in the 5 – 520 MeV / c 2 mass range. [ABSTRACT FROM AUTHOR]

Published
2015
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6. Search for dark Higgsstrahlung in [formula omitted] and missing energy events with the KLOE experiment.

Subjects
*DARK matter, *NUCLEAR physics experiments, *PHOTONS, *NUCLEAR counters, *HIGGS bosons
Abstract

We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h ′ , with the KLOE detector at DAΦNE. We investigated the case of h ′ lighter than U , with U decaying into a muon pair and h ′ producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2 m μ < m U < 1000 MeV , m h ′ < m U . [ABSTRACT FROM AUTHOR]

Published
2015
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7. Search for light vector boson production in [formula omitted] interactions with the KLOE experiment.

Subjects
*BOSONS, *PARTICLE physics, *COLLISIONS (Nuclear physics), *LUMINOSITY, *PHOTONS, *HIGGS bosons
Abstract

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 astrophysical evidence for the presence of dark matter in the Universe. Using e + e − collisions collected with an integrated luminosity of 239.3 pb −1 , we look for a dimuon mass peak in the reaction e + e − → μ + μ − γ , corresponding to the decay U → μ + μ − . 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 × 10 − 5 to 8.6 × 10 − 7 for the mass region 520 < m U < 980 MeV . [ABSTRACT FROM AUTHOR]

Published
2014
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8. Probing dark force at BES-III/BEPCII

Author

Li, Hai-Bo and Luo, Tao

Subjects
*DARK energy, *COLLIDERS (Nuclear physics), *BOSONS, *VECTOR fields, *WEAK interactions (Nuclear physics), *DARK matter, *RADIOACTIVE decay
Abstract

Abstract: We study an experimental search of a GeV scale vector boson at BES-III/BEPCII. It is responsible for mediating a new interaction, as recently exploited in the context of weakly interacting massive particle dark matter. At low energy colliders this dark state can be efficiently probed. We discuss the direct productions of this light vector U boson and the decay of this state with BES-III data and its foreseen larger data. In particular, we show that Higgs''-strahlung in the dark sector can lead to multilepton signatures, which probe the physics range for kinetic mixing parameter over a large portion of the parameter space. [Copyright &y& Elsevier]

Published
2010
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9. Search for a new light boson in meson decays

Author

Pszczel, Damian and Pszczel, Damian

Abstract

The subject of the presented work lies in the field of experimental particle physics. The main topic is the study of e+ e− pairs from η meson decays. The data sample used in this work was collected by the WASA-at-COSY collaboration in proton-proton collisions at 1.4 GeV kinetic beam energy. The experiment took place in 2012 at Forschungzentrum Jülich in Germany at the COSY storage ring. An internal proton beam interacted with a pellet target of frozen hydrogen. We implemented a set of selection criteria in order to extract the η → e+ e− γ event candidates. This is a rare electromagnetic decay of the η meson with branching ratio equal to 6.9·10−3. The resulting set of events served as the basis for three analyses. First, we extracted the η transition form factor that is a function depending on the inner quark and gluon structure of the meson. We implemented a specific method to reduce the contribution of background channels from direct pion production. The second analysis was the search for a narrow structure on the e+ e− invariant mass in the selected sample of η → e+ e− γ candidates. Many theoretical models and some astrophysical and particle physics measurements suggest the existence of a new boson, also called the dark photon, that couples to both dark and to Standard Model particles. This particle would decay to e+ e− pairs of well-defined mass and therefore could be detected by looking for narrow peaks in the e+ e− invariant mass spectra. Since no statistically significant signal was observed, we set an upper limit on the coupling parameter ε2. The third objective of this work was to select a sample of η → e+ e− candidates. This is a very rare decay and therefore sensitive to physics beyond the Standard Model. No signal from η → e+ e− was observed, therefore we were able to set an upper limit on the branching ratio for this decay.

Published
2018

11. Limit on the production of a new vector boson in $e^{+}e^{-} \rightarrow U\gamma$, $U\rightarrow \pi^{+}\pi^{-}$ with the KLOE experiment

Author

Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, Eryk, D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, Aleksander, Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, L., Ikegami Andersson, W., Johansson, T., Kisielewska, Daria, Krzemień, Wojciech, Kupsc, A., Loffredo, S., Mandaglio, G., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, Paweł, Palladino, A., Papenbrock, M., Passeri, A., Patera, V., Perez del Rio, Elena, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Silarski, M., Sirghi, F., Tortora, L., Venanzoni, G., Wiślicki, W., and Wolke, M.

Subjects
dark photon, dark forces, U boson, dark matter
Published
2016

12. Limit on the production of a new vector boson in e+e-→Uγ, U→π+π- with the KLOE experiment

Author

A. D'Uffizi, Aleksander Gajos, Eryk Czerwiński, L. Caldeira Balkeståhl, I. Sarra, A. De Santis, G. D'Agostini, E. Dané, B. Cao, A. Di Cicco, Wojciech Krzemien, V. De Leo, Filippo Ceradini, S. Loffredo, G. Venanzoni, M. Papenbrock, F. Bossi, D. Moricciani, F. Sirghi, D. Babusci, P. Branchini, G. Felici, F. Curciarello, C. Bloise, Paolo Ciambrone, M. Berlowski, R. Di Salvo, S. Fiore, A. Ranieri, E. Graziani, A. Fantini, S. Giovannella, S. Miscetti, L. Tortora, G. Giardina, Lena Heijkenskjöld, Paweł Moskal, Antonio Budano, M. Martini, A. Di Domenico, Michał Silarski, A. Passeri, Daria Kamińska, P. De Simone, D. Domenici, Wojciech Wiślicki, Gianfranco Morello, M. Mascolo, Magnus Wolke, P. Gauzzi, E. Perez del Rio, Marco Schioppa, F. Happacher, W. Ikegami Andersson, Vincenzo Patera, Andrzej Kupsc, E. De Lucia, Giuseppe Mandaglio, Paolo Santangelo, R. Messi, T. Johansson, A. Palladino, G. Bencivenni, A. Anastasi, Fiore, S., Anastasi, A., Ceradini, Filippo, DI CICCO, Alessandro, and Loffredo, Salvatore

Subjects
Particle physics, Nuclear and High Energy Physics, Dark forces, Photon, Electron–positron annihilation, Dark matter, U boson, Radiation, 01 natural sciences, Dark photon, Vector boson, Nuclear physics, Subatomär fysik, 0103 physical sciences, Subatomic Physics, 010306 general physics, Physics, Gauge boson, 010308 nuclear & particles physics, Branching fraction, Settore FIS/01 - Fisica Sperimentale, Dark force
Abstract

The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, e 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones.

Published
2016

13. Limit on the production of a new vector boson in e+e− → Uγ, U → π+π− with the KLOE experiment

Author

Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståh, Li, Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, Lena, Ikegami Andersson, Walter, Johansson, Tord, Kamińska, D., Krzemien, W., Kupsc, A., Loffredo, S., Mandaglio, G., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Palladino, A., Papenbrock, Michael, Passeri, A., Patera, V., Perez del Rio, E., Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Silarski, M., Sirghi, F., Tortora, L., Venanzoni, G., Wiślicki, W., Wolke, Magnus, Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståh, Li, Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, Lena, Ikegami Andersson, Walter, Johansson, Tord, Kamińska, D., Krzemien, W., Kupsc, A., Loffredo, S., Mandaglio, G., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Palladino, A., Papenbrock, Michael, Passeri, A., Patera, V., Perez del Rio, E., Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Silarski, M., Sirghi, F., Tortora, L., Venanzoni, G., Wiślicki, W., and Wolke, Magnus

Abstract

The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, ε 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones.

Published
2016
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14. Probing dark force at BES-III/BEPCII

Author

Hai-Bo Li and Tao Luo

Subjects
Physics, Cross-section, Nuclear and High Energy Physics, Particle physics, Dark sector, Electron–positron annihilation, Dark matter, Massive particle, FOS: Physical sciences, U boson, Context (language use), Parameter space, High Energy Physics - Experiment, Vector boson, Nuclear physics, High Energy Physics - Phenomenology, BES-III, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Dark state, High Energy Physics::Experiment, J/ψ decay, Boson
Abstract

We study an experimental search of a GeV scale vector boson at BES-III/BEPCII. It is responsible for mediating a new U(1)$_d$ interaction, as recently exploited in the context of weakly interacting massive particle dark matter. At low energy $e^+ e^-$ colliders this dark state can be efficiently probed. We discuss the direct productions of this light vector $U$ boson and the decay of this state with BES-III data and its foreseen larger data. In particular, we show that Higgs' strahlung in the dark sector can lead to multilepton signatures, which probe the physics range for kinetic mixing parameter $\epsilon \sim 10^{-4} -10^{-3}$ over a large portion of the parameter space., Comment: 8 pages and 4 figures, version to appear in Phys. Lett. B

Published
2010

15. Limit on the production of a low-mass vector boson in e+e−→Uγ , U→e+e− with the KLOE experiment

Author

Anastasi, Antonio, Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, Francesca, Czerwiński, E., D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, A., Gauzzi, P., Giardina, Giorgio 42, Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, L., Ikegami Andersson, W., Johansson, T., Kamińska, D., Krzemien, W., Kupsc, A., Loffredo, S., Mandaglio, Giuseppe, Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Palladino, A., Papenbrock, M., Passeri, A., Patera, V., Perez del Rio, E., Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Silarski, M., Sirghi, F., Tortora, L., Venanzoni, G., Wiślicki, W., and Wolke, M.

Subjects
Dark forces, Dark matter, Dark photon, U boson, A′, lcsh:Physics, lcsh:QC1-999
Abstract

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DAΦNE e+ e− collider. Using an integrated luminosity of 1.54 fb−1 , we studied the process e+e−→Uγ , with U→e+e− , using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, ε2 , at 10−6 – 10−4 in the 5–520 MeV/c2 mass range.

Published
2015

16. Search for dark Higgsstrahlung in e+ e- -> mu+ mu- and missing energy events with the KLOE experiment

Author

M. Berlowski, M. Silarski, S. Miscetti, W. Krzemien, M. Mascolo, S. Fiore, A. Fantini, R. Di Salvo, L. Tortora, E. Perez del Rio, G. Morello, P. De Simone, F. Sirghi, P. Branchini, Andrzej Kupsc, A. D'Uffizi, Aleksander Gajos, Magnus Wolke, P. Gauzzi, A. Palladino, Eryk Czerwiński, I. Sarra, G. Felici, P. Ciambrone, S. Loffredo, R. Messi, G. D'Agostini, L. Caldeira Balkeståhl, A. Passeri, D. Babusci, W. Ikegami Andersson, D. Moricciani, A. Anastasi, A. Di Cicco, F. Curciarello, T. Johansson, D. Domenici, G. Giardina, W. Wiślicki, G. Bencivenni, F. Bossi, A. De Santis, S. Giovannella, G. Venanzoni, P. Santangelo, M. Schioppa, V. De Leo, Lena Heijkenskjöld, Paweł Moskal, E. Dane, E. Graziani, Daria Kamińska, M. Martini, A. Di Domenico, F. Nguyen, A. Budano, B. Cao, C. Bloise, F. Ceradini, V. Patera, A. Ranieri, E. De Lucia, F. Happacher, Giuseppe Mandaglio, Nguyen, F., Anastasi, A, Ceradini, Filippo, DI CICCO, Alessandro, and Loffredo, Salvatore

Subjects
Particle physics, Dark forces, Nuclear and High Energy Physics, Photon, Dark matter, Dark photon, electron positron collider, KLOE experiment, Dark matter, U boson, 7. Clean energy, Dark photon, High Energy Physics - Experiment, Nuclear physics, dark matter, dark forces, upper limit, Higgsstrahlung, WIMP, Upper limit, electron positron collider, Settore FIS/01, Physics, Muon, Missing energy, High Energy Physics::Phenomenology, State (functional analysis), lcsh:QC1-999, Dark force, Higgs boson, Physics::Accelerator Physics, High Energy Physics::Experiment, KLOE experiment, lcsh:Physics
Abstract

We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h', with the KLOE detector at DAFNE. We investigated the case of h' lighter than U, with U decaying into a muon pair and h' producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2m_mu, Comment: 16 pages, 7 figures, submitted to Physics Letters B

Published
2015

17. Limit on the production of a low-mass vector boson in $e^{+}e^{-} \rightarrow U\gamma$, $U\rightarrow e^{+}e^{-}$, with the KLOE experiment

Author

Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, Eryk, D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, Aleksander, Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, L., Ikegami Andersson, W., Johansson, T., Kisielewska, Daria, Krzemień, Wojciech, Kupsc, A., Loffredo, S., Mandaglio, G., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, Paweł, Palladino, A., Papenbrock, M., Passeri, A., Patera, V., Perez del Rio, Elena, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sirghi, F., Tortora, L., Venanzoni, G., Wiślicki, W., Wolke, M., and Silarski, Michał

Subjects
dark photon, dark forces, U boson, dark matter
Published
2015

18. Search for dark Higgsstrahlung in $e^{+}e^{-}\rightarrow \mu ^{+}\mu ^{-}$ and missing energy events with the KLOE experiment

Author

Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, Eryk, D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, Aleksander, Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, L., Ikegami Andersson, W., Johansson, T., Kisielewska, Daria, Krzemień, Wojciech, Kupsc, A., Loffredo, S., Mandaglio, G., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, Paweł, Nguyen, F., Palladino, A., Passeri, A., Patera, V., Perez del Rio, Elena, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Silarski, Michał, Sirghi, F., Tortora, L., Venanzoni, G., Wiślicki, W., and Wolke, M.

Subjects
dark forces, U boson, Higgsstrahlung, upper limit, dark matter
Published
2015

19. Limit on the production of a low-mass vector boson in e(+)e(-) -> U gamma, U -> e(+)e(-) with the KLOE experiment

Author

Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkeståhl, Li Caldeira, Cao, Bo, Ceradini, F., Ciambrone, R., Curciarello, F., Czerwinski, E., D'Agostini, G., Dane, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjold, Lena, Andersson, Walter Ikegami, Johansson, Tord, Kaminska, D., Krzemien, W., Kupsc, Andrezej, Loffredo, S., Mandaglio, G., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Palladino, A., Papenbrock, Michael, Passeri, A., Patera, V., del Rio, E. Perez, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Silarski, M., Sirghi, F., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, Magnus

Subjects
Dark forces, Astronomi, astrofysik och kosmologi, Dark matter, Astronomy, Astrophysics and Cosmology, Dark photon, U boson, A '
Abstract

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DA Phi NE e(+)e(-) collider. Using an integrated luminosity of 1.54 fb(-1), we studied the process e(+)e(-) -> U gamma, with U -> e(+)e(-), using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, epsilon(2), at 10(-6)-10(-4) in the 5-520 MeV/c(2) mass range.

Published
2015

20. Search for dark Higgsstrahlung in e(+0)e(-) -> mu(+)mu(-) and missing energy events with the KLOE experiment

Author

Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkestahl, Li Caldeira, Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiriski, E., D'Agostini, G., Dane, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Di Salvo, R., Domenici, D., D'Uffizi, A., Fantini, A., Felici, G., Fiore, S., Gajos, A., Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjold, Lena, Ikegami, Walter Andersson, Johansson, Tord, Kaminska, D., Krzemien, W., Kupsc, Andrezej, Loffredo, S., Mandaglio, G., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Palladino, A., Passeri, A., Patera, V., del Rio, E. Perez, Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Silarski, M., Sirghi, F., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, Magnus

Subjects
Dark forces, High Energy Physics::Phenomenology, Physical Sciences, Dark matter, Upper limit, Fysik, High Energy Physics::Experiment, U boson, Higgsstrahlung
Abstract

We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h', with the KLOE detector at DA Phi NE. We investigated the case of h' lighter than U, with U decaying into a muon pair and h' producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2m(mu) < m(U) < 1000 MeV, m(h') < m(U). (C) 2015 The Authors. Published by Elsevier B.V.

Published
2015

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

Author

Babusci, D., Pytko, Izabela, Bencivenni, G., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkeståhl, L. Caldeira, Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, Eryk, 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, Aleksander, Gauzzi, P., Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, L., Höistad, B., Johansson, T., Kacprzak, K., Kisielewska, Daria, Krzemień, Wojciech, 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, Paweł, Nguyen, F., Palladino, A., Passeri, A., Patera, V., Prado Longhi, I., Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, Michał, Tortora, L., Venanzoni, G., Wiślicki, W., Wolke, M., and Zdebik, Jarosław

Subjects
dark forces, U boson, High Energy Physics::Experiment, dark matter, 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, Comment: 12 pages, 7 figures, version accepted for publication in Physics Letters B

Published
2014

22. Search for light vector boson production in e(+)e(-) -> 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., 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., Heijkenskjöld, Lena, Holstad, B., Johansson, Tord, Kacprzak, K., Kaminska, D., Krzemien, W., Kupsc, Andrzej, 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, Magnus, and Zdebik, J.

Subjects
Dark forces, Physical Sciences, Dark matter, Fysik, High Energy Physics::Experiment, U boson
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 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 239.3 pb(-1), we look for a dimuon mass peak in the reaction e(+)e(-) -> mu(+)mu(-)gamma, corresponding to the decay U -> 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 x 10(-5) to 8.6 x 10(-7) for the mass region 520 < m(U) < 980 MeV.

Published
2014

23. Search for light vector boson production in e+e−→μ+μ−γ interactions with the KLOE experiment

Author

Babusci, D., Balwierz-Pytko, I., Bencivenni, G., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, 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., Heijkenskjöld, L., Höistad, B., Johansson, T., Kacprzak, K., Kamińska, 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., Prado Longhi, I., Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Tortora, L., Venanzoni, G., Wiślicki, W., Wolke, M., and Zdebik, J.

Subjects
Dark forces, Dark matter, U boson, High Energy Physics::Experiment, lcsh:Physics, lcsh:QC1-999
Abstract

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 astrophysical evidence for the presence of dark matter in the Universe. Using e+e− collisions collected with an integrated luminosity of 239.3 pb −1 , we look for a dimuon mass peak in the reaction e+e−→μ+μ−γ , corresponding to the decay U→μ+μ− . 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 1.6×10−5 to 8.6×10−7 for the mass region 520

Published
2014

24. Search for light vector boson production in e+e-→μ+μ-γ interactions with the KLOE experiment

Author

Fiore, S. and Fiore, S.

Subjects
Dark forces, Dark force, Dark matter, U boson
Abstract

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 astrophysical evidence for the presence of dark matter in the Universe. Using e+e- collisions collected with an integrated luminosity of 239.3 pb-1, we look for a dimuon mass peak in the reaction e+e-→μ+μ-γ, corresponding to the decay U→μ+μ-. 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 1.6×10-5 to 8.6×10-7 for the mass region 520

Published
2014

25. Search for light vector boson production in e+e-→μ+μ-γ interactions with the KLOE experiment

Author

Babusci, D., Balwierz Pytko, I., Bencivenni, G., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., Danè, E., De Leo, V., De Lucia, E., De Robertis, G., De Santis, A., De Simone, P., Di Cicco, A., DI DOMENICO, Antonio, Di Salvo, R., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gajos, A., Gauzzi, Paolo, Giardina, G., Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, L., Höistad, B., Johansson, T., Kacprzak, K., Kamińska, 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, Vincenzo, Prado Longhi, I., Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Tortora, L., Venanzoni, G., Wiślicki, W., Wolke, M., and Zdebik, J.

Subjects
Dark forces, Dark matter, U boson, Nuclear and High Energy Physics, Settore FIS/04 - Fisica Nucleare e Subnucleare
Published
2014

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