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1. Performances of a new generation tracking detector: the MEG II cylindrical drift chamber

Author

A. M. Baldini, H. Benmansour, G. Boca, G. Cavoto, F. Cei, M. Chiappini, G. Chiarello, A. Corvaglia, F. Cuna, M. Francesconi, L. Galli, F. Grancagnolo, E. G. Grandoni, M. Grassi, M. Hildebrandt, F. Ignatov, M. Meucci, W. Molzon, D. Nicolò, A. Oya, D. Palo, M. Panareo, A. Papa, F. Raffaelli, F. Renga, G. Signorelli, G. F. Tassielli, Y. Uchiyama, A. Venturini, B. Vitali, and C. Voena

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The cylindrical drift chamber is the most innovative part of the MEG II detector, the upgraded version of the MEG experiment. The MEG II chamber differs from the MEG one because it is a single volume cylindrical structure, instead of a segmented one, chosen to improve its resolutions and efficiency in detecting low energy positrons from muon decays at rest. In this paper, we show the characteristics and performances of this fundamental part of the MEG II apparatus and we discuss the impact of its higher resolution and efficiency on the sensitivity of the MEG II experiment. Because of its innovative structure and high quality resolution and efficiency the MEG II cylindrical drift chamber will be a cornerstone in the development of an ideal tracking detector for future positron-electron collider machines.

Published
2024
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2. A search for $$\upmu ^+ \rightarrow \textrm{e}^+ \upgamma $$ μ + → e + γ with the first dataset of the MEG II experiment

Author

K. Afanaciev, A. M. Baldini, S. Ban, V. Baranov, H. Benmansour, M. Biasotti, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei, M. Chiappini, G. Chiarello, A. Corvaglia, F. Cuna, G. Dal Maso, A. De Bari, M. De Gerone, L. Ferrari Barusso, M. Francesconi, L. Galli, G. Gallucci, F. Gatti, L. Gerritzen, F. Grancagnolo, E. G. Grandoni, M. Grassi, D. N. Grigoriev, M. Hildebrandt, K. Ieki, F. Ignatov, F. Ikeda, T. Iwamoto, S. Karpov, P.-R. Kettle, N. Khomutov, S. Kobayashi, A. Kolesnikov, N. Kravchuk, V. Krylov, N. Kuchinskiy, W. Kyle, T. Libeiro, V. Malyshev, A. Matsushita, M. Meucci, S. Mihara, W. Molzon, Toshinori Mori, M. Nakao, D. Nicolò, H. Nishiguchi, A. Ochi, S. Ogawa, R. Onda, W. Ootani, A. Oya, D. Palo, M. Panareo, A. Papa, V. Pettinacci, A. Popov, F. Renga, S. Ritt, M. Rossella, A. Rozhdestvensky, P. Schwendimann, K. Shimada, G. Signorelli, M. Takahashi, G. F. Tassielli, K. Toyoda, Y. Uchiyama, M. Usami, A. Venturini, B. Vitali, C. Voena, K. Yamamoto, K. Yanai, T. Yonemoto, K. Yoshida, Yu. V. Yudin, and MEG II Collaboration

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports the result of a search for the decay $$\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma $$ μ + → e + γ from data taken in the first physics run in 2021. No excess of events over the expected background is observed, yielding an upper limit on the branching ratio of $${\mathcal {B}} (\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma ) < 7.5 \times 10^{-13}$$ B ( μ + → e + γ ) < 7.5 × 10 - 13 (90% CL). The combination of this result and the limit obtained by MEG gives $${\mathcal {B}} (\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma ) < 3.1 \times 10^{-13}$$ B ( μ + → e + γ ) < 3.1 × 10 - 13 (90% CL), which is the most stringent limit to date. A ten-fold larger sample of data is being collected during the years 2022–2023, and data-taking will continue in the coming years.

Published
2024
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3. Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment

Author

A. M. Baldini, F. Berg, M. Biasotti, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei, M. Chiappini, G. Chiarello, C. Chiri, A. Corvaglia, A. de Bari, M. De Gerone, M. Francesconi, L. Galli, F. Gatti, F. Grancagnolo, M. Grassi, D. N. Grigoriev, M. Hildebrandt, Z. Hodge, K. Ieki, F. Ignatov, R. Iwai, T. Iwamoto, S. Kobayashi, P.-R. Kettle, W. Kyle, N. Khomutov, A. Kolesnikov, N. Kravchuk, N. Kuchinskiy, T. Libeiro, G. M. A. Lim, V. Malyshev, N. Matsuzawa, M. Meucci, S. Mihara, W. Molzon, Toshinori Mori, A. Mtchedilishvili, M. Nakao, H. Natori, D. Nicolò, H. Nishiguchi, M. Nishimura, S. Ogawa, R. Onda, W. Ootani, A. Oya, D. Palo, M. Panareo, A. Papa, V. Pettinacci, G. Pizzigoni, A. Popov, F. Renga, S. Ritt, A. Rozhdestvensky, M. Rossella, R. Sawada, P. Schwendimann, G. Signorelli, A. Stoykov, G. F. Tassielli, K. Toyoda, Y. Uchiyama, M. Usami, C. Voena, K. Yanai, and Yu. V. Yudin

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, $$\upmu ^+ \rightarrow \mathrm {e}^+\mathrm {X}, \mathrm {X} \rightarrow \upgamma \upgamma \ $$ μ + → e + X , X → γ γ . This search uses a dataset resulting from $$7.5\times 10^{14}$$ 7.5 × 10 14 stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013. No significant excess is found in the mass region 20–45 MeV/c $$^2$$ 2 for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20–40 MeV/c $$^2$$ 2 , down to $${\mathcal {O}}(10^{-11})$$ O ( 10 - 11 ) at 90% confidence level.

Published
2020
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4. The design of the MEG II experiment

Author

A. M. Baldini, E. Baracchini, C. Bemporad, F. Berg, M. Biasotti, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei, M. Chiappini, G. Chiarello, C. Chiri, G. Cocciolo, A. Corvaglia, A. de Bari, M. De Gerone, A. D’Onofrio, M. Francesconi, Y. Fujii, L. Galli, F. Gatti, F. Grancagnolo, M. Grassi, D. N. Grigoriev, M. Hildebrandt, Z. Hodge, K. Ieki, F. Ignatov, R. Iwai, T. Iwamoto, D. Kaneko, K. Kasami, P.-R. Kettle, B. I. Khazin, N. Khomutov, A. Korenchenko, N. Kravchuk, T. Libeiro, M. Maki, N. Matsuzawa, S. Mihara, M. Milgie, W. Molzon, Toshinori Mori, F. Morsani, A. Mtchedilishvili, M. Nakao, S. Nakaura, D. Nicolò, H. Nishiguchi, M. Nishimura, S. Ogawa, W. Ootani, M. Panareo, A. Papa, A. Pepino, G. Piredda, A. Popov, F. Raffaelli, F. Renga, E. Ripiccini, S. Ritt, M. Rossella, G. Rutar, R. Sawada, G. Signorelli, M. Simonetta, G. F. Tassielli, Y. Uchiyama, M. Usami, M. Venturini, C. Voena, K. Yoshida, Yu. V. Yudin, and Y. Zhang

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The MEG experiment, designed to search for the $${\mu ^+ \rightarrow \hbox {e}^+ \gamma }$$ μ+→e+γ decay, completed data-taking in 2013 reaching a sensitivity level of $${5.3\times 10^{-13}}$$ 5.3×10-13 for the branching ratio. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of $$6\times 10^{-14}$$ 6×10-14 , a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation for the upgrade and a detailed overview of the design of the experiment and of the expected detector performance.

Published
2018
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5. Lepton Flavour Violation Experiments

Author

F. Cei and D. Nicolò

Subjects
Physics, QC1-999
Abstract

Lepton Flavour Violation in the charged lepton sector (CLFV) is forbidden in the Minimal Standard model and strongly suppressed in extensions of the model to include finite neutrino mixing. On the other hand, a wide class of Supersymmetric theories, even coupled with Grand Unification models (SUSY-GUT models), predict CLFV processes at a rate within the reach of new experimental searches operated with high resolution detectors at high intensity accelerators. As the Standard model background is negligible, the observation of one or more CLFV events would provide incontrovertible evidence for physics beyond Standard model, while a null effect would severely constrain the set of theory parameters. Therefore, a big experimental effort is currently (and will be for incoming years) accomplished to achieve unprecedented sensitivity on several CLFV processes. In this paper we review past and recent results in this research field, with focus on CLFV channels involving muons and tau's. We present currently operating experiments as well as future projects, with emphasis laid on how sensitivity enhancements are accompanied by improvements on detection techniques. Limitations due to systematic effects are also discussed in detail together with the solutions being adopted to overcome them.

Published
2014
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8. The Cylindrical Drift Chamber of the MEG II experiment

Author

M. Chiappini, A.M. Baldini, H. Benmansour, G. Cavoto, F. Cei, G. Chiarello, A. Corvaglia, F. Cuna, G. Dal Maso, M. Francesconi, L. Galli, F. Grancagnolo, M. Grassi, M. Hildebrandt, F. Ignatov, M. Meucci, A. Miccoli, W. Molzon, D. Nicolò, A. Oya, D. Palo, M. Panareo, A. Papa, F. Raffaelli, F. Renga, P. Schwendimann, G. Signorelli, G.F. Tassielli, Y. Uchiyama, A. Venturini, B. Vitali, C. Voena, Chiappini, M., Baldini, A. M., Benmansour, H., Cavoto, G., Cei, F., Chiarello, G., Corvaglia, A., Cuna, F., Maso, G. Dal, Francesconi, M., Galli, L., Grancagnolo, F., Grassi, M., Hildebrandt, M., Ignatov, F., Meucci, M., Miccoli, A., Molzon, W., Nicolò, D., Oya, A., Palo, D., Panareo, M., Papa, A., Raffaelli, F., Renga, F., Schwendimann, P., Signorelli, G., Tassielli, G. F., Uchiyama, Y., Venturini, A., Vitali, B., and Voena, C.

Subjects
Nuclear and High Energy Physics, Gaseous detector, Drift chamber, Commissioning, Tracking, MEG II, Lepton flavor violation, drift chamber, Muon, charged lepton flavour violation, gas detector, Instrumentation
Abstract

The MEG experiment at the Paul Scherrer Institut (PSI) represents the state of the art in the search for the charged Lepton Flavor Violating μ+→e+γ decay, setting the most stringent upper limit on the BR(μ+→e+γ)≤4.2×10^-13 (90% C.L.). An upgrade of MEG, MEG II, was designed, commissioned and recently started the physics data taking. Its goal is to reach a sensitivity level of . In order to 6×10^-14 reconstruct the positron momentum vector a Cylindrical Drift CHamber (CDCH) with unprecedented peculiarities was built, featuring angular and momentum resolutions at the 6.5 mrad and 100 keV/c level. The CDCH is a 2-meter long, 60 cm in diameter, low-mass, single volume detector with high granularity: 9 layers of 192 drift cells, few mm wide, defined by wires in a stereo configuration for longitudinal hit localization. The filling gas mixture is Helium:Isobutane 90:10. The total radiation length is 1.5×10^-3 X0, thus minimizing the Multiple Coulomb Scattering and allowing for a single-hit resolution

Published
2023
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9. A SQUID controller unit for space-based TES sensor readout

Author

M. Zannoni, A. Passerini, G. Signorelli, J.-F. Cliche, G. Coppi, P. Dal Bo, S. Della Torre, E. Di Giorgi, M. Dobbs, L. Galli, M. Gervasi, A. Limonta, M. Massa, A. Moggi, J. Montgomery, F. Nati, D. Nicolò, M. Pinchera, D. Poletti, G. Smecher, F. Spinella, A. Tartari, Zannoni, M, Passerini, A, Signorelli, G, Cliche, J, Coppi, G, Bo, P, Torre, S, Giorgi, E, Dobbs, M, Galli, L, Gervasi, M, Limonta, A, Massa, M, Moggi, A, Montgomery, J, Nati, F, Nicolo, D, Pinchera, M, Poletti, D, Smecher, G, Spinella, F, and Tartari, A

Subjects
FIS/05 - ASTRONOMIA E ASTROFISICA, Nuclear and High Energy Physics, TES readout, CMB, SQUID, Instrumentation
Abstract

We have developed a Superconducting Quantum Interference Device (SQUID) controller unit for Transition Edge Sensors (TES) readout, designed to be used in a space mission. The unit is made of 8 boards and each board can condition four SQUID array amplifiers. The board design is inspired by a similar one developed for ground based experiments, but specific changes have been made to adopt Components Off The Shelf (COTS) with space grade equivalents, to implement redundancy and cross-strapping capabilities. The design also includes the thermal path to lift the heat off the boards towards an in-house designed monolithic aluminum rack.

Published
2023
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10. Toward an Integrated Segment Reporting: Between Tradition and Innovation

Author

M G Baldarelli, D Nicolò, M G Baldarelli, and D Nicolò

Subjects
Environmental reporting, Integrated reporting, Social reporting, Segment reporting, Social segment reporting, Sustainability reporting
Abstract

This paper aims to focus on the contribution of the approach by segments to planning and reporting social and environmental performance along with economic and financial dimensions. After the review of the literature about stakeholder’s theory and segment reporting, the paper analyse the logic underlying the technique of segmentation in the "space" and in the "time" for corporate reporting in theory and in practice.

Published
2019

12. The design of the MEG II experiment: MEG II Collaboration

Author

G. Cavoto, Stefan Ritt, P. W. Cattaneo, A. D’Onofrio, F. Morsani, Yu.V. Yudin, C. Voena, Masatoshi Maki, K. Ieki, S. Nakaura, Flavio Gatti, T. Libeiro, A. S. Korenchenko, F. Berg, Marco Francesconi, Ryu Sawada, G. F. Tassielli, A. Mtchedilishvili, F. Ignatov, D. Nicolò, C. Bemporad, G. Chiarello, Fabrizio Cei, A. Papa, D. N. Grigoriev, G. Signorelli, Nobuo Matsuzawa, M. Usami, Marco Grassi, Toshinori Mori, M. Simonetta, Andrey Popov, L. Galli, M. Nakao, P.-R. Kettle, A. Pepino, N. P. Kravchuk, Hajime Nishiguchi, A. de Bari, B.I. Khazin, Yusuke Uchiyama, F. Raffaelli, T. Iwamoto, W. R. Molzon, N. V. Khomutov, E. Baracchini, Satoshi Mihara, M. Panareo, D. Kaneko, Y. Zhang, S. Ogawa, A. Corvaglia, Kayo Yoshida, Malte Hildebrandt, G. Piredda, A. M. Baldini, M. Milgie, Wataru Ootani, M. De Gerone, C. Chiri, M. Rossella, Z. Hodge, R. Iwai, Yuki Fujii, Katsuyu Kasami, M. Venturini, M. Nishimura, Gianluigi Boca, F. Grancagnolo, F. Renga, Michele Biasotti, M. Chiappini, G. Rutar, E. Ripiccini, G. Cocciolo, Baldini, A. M., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Chiri, C., Cocciolo, G., Corvaglia, A., de Bari, A., De Gerone, M., D’Onofrio, A., Francesconi, M., Fujii, Y., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwai, R., Iwamoto, T., Kaneko, D., Kasami, K., Kettle, P. -R., Khazin, B. I., Khomutov, N., Korenchenko, A., Kravchuk, N., Libeiro, T., Maki, M., Matsuzawa, N., Mihara, S., Milgie, M., Molzon, W., Mori, Toshinori, Morsani, F., Mtchedilishvili, A., Nakao, M., Nakaura, S., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Ootani, W., Panareo, M., Papa, A., Pepino, A., Piredda, G., Popov, A., Raffaelli, F., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Signorelli, G., Simonetta, M., Tassielli, G. F., Uchiyama, Y., Usami, M., Venturini, M., Voena, C., Yoshida, K., Yudin, Yu. V., and Zhang, Y.

Subjects
SUSY SO(10), Physics and Astronomy (miscellaneous), High Energy Pysics, muons, charged lepton flavor violation, particles detectors, LEPTON-FLAVOR VIOLATION, SUPERSYMMETRIC STANDARD MODEL, SCINTILLATION-COUNTERS, PLASTIC SCINTILLATOR, UNIFIED THEORIES, TIME RESOLUTION, NEUTRINO-MASS, HIGGS-BOSON, 50 PS, 01 natural sciences, Muon Decay Violating Decay, Nuclear physics, 0103 physical sciences, Sensitivity (control systems), Engineering (miscellaneous), 010306 general physics, Physics, 010308 nuclear & particles physics, Branching fraction, Detector, Gamma ray, Upgrade, Order of magnitude
Abstract

The MEG experiment, designed to search for the μ+→e+γ decay, completed data-taking in 2013 reaching a sensitivity level of 5.3×10^−13 for the branching ratio. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6×10^−14, a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation for the upgrade and a detailed overview of the design of the experiment and of the expected detector performance

Published
2018

13. Muon polarization in the MEG experiment: predictions and measurements

Author

A. M. Baldini, Akira Yamamoto, Z. You, M. De Gerone, W. R. Molzon, Malte Hildebrandt, Z. Hodge, B.I. Khazin, Marco Grassi, G. Chiarello, D. N. Grigoriev, Yu Bao, A. Mtchedlishvili, K. Ieki, S. Nakaura, A. Pepino, G. F. Tassielli, G. Cavoto, A. de Bari, T. I. Kang, P. W. Cattaneo, Hajime Nishiguchi, F. Berg, F. Renga, E. Baracchini, Flavio Gatti, A. Papa, Yuki Fujii, Yusuke Uchiyama, T. Haruyama, S. Ogawa, T. Iwamoto, M. Rossella, Andrey Popov, Michele Biasotti, G. M. A. Lim, L. Galli, S. Dussoni, A. S. Korenchenko, G. Pizzigoni, P.-R. Kettle, G. Rutar, E. Ripiccini, F. Grancagnolo, A. D’Onofrio, N. V. Khomutov, Wataru Ootani, Stefan Ritt, N. P. Kravchuk, D. Nicolò, C. Voena, A. Graziosi, F. Ignatov, K. Yoshida, M. Venturini, D. Kaneko, Ryu Sawada, F. Tenchini, G. Piredda, Satoshi Mihara, G. Signorelli, Yu.V. Yudin, M. Nishimura, F. Sergiampietri, Gianluigi Boca, Fabrizio Cei, C. Chiri, M. Panareo, C. Bemporad, and Toshinori Mori

Subjects
Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Order (ring theory), 7. Clean energy, 01 natural sciences, Standard Model, Massless particle, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Production (computer science), Neutrino, 010306 general physics, Engineering (miscellaneous), Energy (signal processing), Lepton
Abstract

The MEG experiment makes use of one of the world's most intense low energy muon beams, in order to search for the lepton flavour violating process $\mu^{+} \rightarrow {\rm e}^{+} \gamma$. We determined the residual beam polarization at the thin stopping target, by measuring the asymmetry of the angular distribution of Michel decay positrons as a function of energy. The initial muon beam polarization at the production is predicted to be $P_{\mu} = -1$ by the Standard Model (SM) with massless neutrinos. We estimated our residual muon polarization to be $P_{\mu} = -0.85 \pm 0.03 ~ {\rm (stat)} ~ { }^{+ 0.04}_{-0.05} ~ {\rm (syst)}$ at the stopping target, which is consistent with the SM predictions when the depolarizing effects occurring during the muon production, propagation and moderation in the target are taken into account. The knowledge of beam polarization is of fundamental importance in order to model the background of our ${\megsign}$ search induced by the muon radiative decay: $\mu^{+} \rightarrow {\rm e}^{+} \bar{\nu}_{\mu} \nu_{\rm e} \gamma$.

Published
2016
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14. Calibration and monitoring of the MEG experiment by a proton beam from a Cockcroft-Walton accelerator

Author

J. Adam, X. Bai, A. Baldini, E. Baracchini, A. Barchiesi, C. Bemporad, G. Boca, P. W. Cattaneo, G. Cavoto, G. Cecchet, F. Cei, C. Cerri, A. De Bari, M. De Gerone, T. Doke, S. Dussoni, J. Egger, L. Galli, G. Gallucci, F. Gatti, B. Golden, M. Grassi, D. N. Grigoriev, T. Haruyama, M. Hildebrandt, Y. Hisamatsu, F. Ignatov, T. Iwamoto, D. Kaneko, P. R. Kettle, B. I. Khazin, O. Kiselev, A. Korenchenko, N. Kravchuk, A. Maki, S. Mihara, W. Molzon, T. Mori, D. Mzavia, H. Natori, R. Nardò, D. Nicolò, H. Nishiguchi, Y. Nishimura, W. Ootani, A. Papa, R. Pazzi, G. Piredda, A. Popov, F. Renga, S. Ritt, M. Rossella, R. Sawada, M. Schneebeli, F. Sergiampietri, G. Signorelli, S. Suzuki, C. Topchyan, V. Tumakov, Y. Uchiyama, R. Valle, C. Voena, F. Xiao, S. Yamada, A. Yamamoto, S. Yamashita, Y.u. V. Yudin, D. Zanello, PANAREO, Marco, J., Adam, X., Bai, A., Baldini, E., Baracchini, A., Barchiesi, C., Bemporad, G., Boca, P. W., Cattaneo, G., Cavoto, G., Cecchet, F., Cei, C., Cerri, A., De Bari, M., De Gerone, T., Doke, S., Dussoni, J., Egger, L., Galli, G., Gallucci, F., Gatti, B., Golden, M., Grassi, D. N., Grigoriev, T., Haruyama, M., Hildebrandt, Y., Hisamatsu, F., Ignatov, T., Iwamoto, D., Kaneko, P. R., Kettle, B. I., Khazin, O., Kiselev, A., Korenchenko, N., Kravchuk, A., Maki, S., Mihara, W., Molzon, T., Mori, D., Mzavia, H., Natori, R., Nardò, D., Nicolò, H., Nishiguchi, Y., Nishimura, W., Ootani, Panareo, Marco, A., Papa, R., Pazzi, G., Piredda, A., Popov, F., Renga, S., Ritt, M., Rossella, R., Sawada, M., Schneebeli, F., Sergiampietri, G., Signorelli, S., Suzuki, C., Topchyan, V., Tumakov, Y., Uchiyama, R., Valle, C., Voena, F., Xiao, S., Yamada, A., Yamamoto, S., Yamashita, Yudin, Y. u. V., and D., Zanello

Subjects
Calibration, Beam monitoring, γ-rays, Cockcroft–Walton accelerator
Abstract

The MEG experiment at PSI searches for the decay μ→eγ at a level of ≈10^−13 on the branching ratio BR(μ→eγ/μ→tot), well beyond the present experimental limit (BR≤1.2×10^−11) and is sensitive to the predictions of SUSY-GUT theories. To reach this goal the experiment uses one of the most intense continuous surface muon beams available (≈10^8μ/s) and relies on advanced technology (LXe calorimetry, a gradient-field superconducting spectrometer as well as flexible and powerful trigger and acquisition systems). In order to maintain the highest possible energy, time and spatial resolutions for such detector, frequent calibration and monitoring, using a Cockcroft–Walton proton accelerator, are required. The proton beam is brought to the centre of MEG by a special bellows insertion system and travels in a direction opposite to the one of the normal μ-beam. Protons interact with a lithium tetraborate (Li2B4O7) nuclear target and produce one γ (17.6 MeV) from the reaction 3-7 Li(p, γ)8-4 or two coincident γs (11.67 and 4.4 MeV) from the reaction 11-5 B(p, γ)12-6 C*. The 17.6 MeV γ is used for calibrating and monitoring the LXe calorimeter (σEγ/Eγ=3.85±0.15% at 17.6 MeV) while the coincident 11.67 and 4.4 MeV γs are used to measure the relative timing of the calorimeter and the spectrometer timing counters (σ_delta_t=0.450±0.015ns).

Published
2011

15. New Limit on the Lepton-Flavor-Violating Decay μ→eγ

Author

J. Adam, X. Bai, A. M. Baldini, E. Baracchini, C. Bemporad, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei, C. Cerri, A. de Bari, M. De Gerone, T. Doke, S. Dussoni, J. Egger, K. Fratini, Y. Fujii, L. Galli, G. Gallucci, F. Gatti, B. Golden, M. Grassi, D. N. Grigoriev, T. Haruyama, M. Hildebrandt, Y. Hisamatsu, F. Ignatov, T. Iwamoto, P. R. Kettle, B. I. Khazin, O. Kiselev, A. Korenchenko, N. Kravchuk, A. Maki, S. Mihara, W. Molzon, T. Mori, D. Mzavia, H. Natori, D. Nicolò, H. Nishiguchi, Y. Nishimura, W. Ootani, A. Papa, R. Pazzi, G. Piredda, A. Popov, F. Renga, S. Ritt, M. Rossella, R. Sawada, F. Sergiampietri, G. Signorelli, S. Suzuki, F. Tenchini, C. Topchyan, Y. Uchiyama, R. Valle, C. Voena, F. Xiao, S. Yamada, A. Yamamoto, S. Yamashita, Y.u. V. Yudin, D. Zanello, PANAREO, Marco, J., Adam, X., Bai, A. M., Baldini, E., Baracchini, C., Bemporad, G., Boca, P. W., Cattaneo, G., Cavoto, F., Cei, C., Cerri, A., de Bari, M., De Gerone, T., Doke, S., Dussoni, J., Egger, K., Fratini, Y., Fujii, L., Galli, G., Gallucci, F., Gatti, B., Golden, M., Grassi, D. N., Grigoriev, T., Haruyama, M., Hildebrandt, Y., Hisamatsu, F., Ignatov, T., Iwamoto, P. R., Kettle, B. I., Khazin, O., Kiselev, A., Korenchenko, N., Kravchuk, A., Maki, S., Mihara, W., Molzon, T., Mori, D., Mzavia, H., Natori, D., Nicolò, H., Nishiguchi, Y., Nishimura, W., Ootani, Panareo, Marco, A., Papa, R., Pazzi, G., Piredda, A., Popov, F., Renga, S., Ritt, M., Rossella, R., Sawada, F., Sergiampietri, G., Signorelli, S., Suzuki, F., Tenchini, C., Topchyan, Y., Uchiyama, R., Valle, C., Voena, F., Xiao, S., Yamada, A., Yamamoto, S., Yamashita, Yudin, Y. u. V., and D., Zanello

Subjects
lepton-flavor-violating decay
Abstract

We present a new result based on an analysis of the data collected by the MEG detector at the Paul Scherrer Institut in 2009 and 2010, in search of the lepton-flavor-violating decay μ→eγ. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8×10^14 muon decays, gives a 90% C.L. upper limit of 2.4×10^-12 on the branching ratio of the μ→eγ decay, constituting the most stringent limit on the existence of this decay to date.

Published
2011

16. A limit for the μ → e γ decay from the MEG experiment

Author

J. Adam, X. Bai, A. Baldini, E. Baracchini, A. Barchiesi, C. Bemporad, G. Boca, P. W. Cattaneo, G. Cavoto, G. Cecchet, F. Cei, C. Cerri, A. De Bari, M. De Gerone, T. Doke, S. Dussoni, J. Egger, L. Galli, G. Gallucci, F. Gatti, B. Golden, M. Grassi, D. N. Grigoriev, T. Haruyama, M. Hildebrandt, Y. Hisamatsu, F. Ignatov, T. Iwamoto, D. Kaneko, P. R. Kettle, B. I. Khazin, O. Kiselev, A. Korenchenko, N. Kravchuk, A. Maki, S. Mihara, W. Molzon, T. Mori, D. Mzavia, H. Natori, R. Nardò, D. Nicolò, H. Nishiguchi, Y. Nishimura, W. Ootani, A. Papa, R. Pazzi, G. Piredda, A. Popov, F. Renga, S. Ritt, M. Rossella, R. Sawada, M. Schneebeli, F. Sergiampietri, G. Signorelli, S. Suzuki, C. Topchyan, V. Tumakov, Y. Uchiyama, R. Valle, C. Voena, F. Xiao, S. Yamada, A. Yamamoto, S. Yamashita, Y.u. V. Yudin, D. Zanello, PANAREO, Marco, J., Adam, X., Bai, A., Baldini, E., Baracchini, A., Barchiesi, C., Bemporad, G., Boca, P. W., Cattaneo, G., Cavoto, G., Cecchet, F., Cei, C., Cerri, A., De Bari, M., De Gerone, T., Doke, S., Dussoni, J., Egger, L., Galli, G., Gallucci, F., Gatti, B., Golden, M., Grassi, D. N., Grigoriev, T., Haruyama, M., Hildebrandt, Y., Hisamatsu, F., Ignatov, T., Iwamoto, D., Kaneko, P. R., Kettle, B. I., Khazin, O., Kiselev, A., Korenchenko, N., Kravchuk, A., Maki, S., Mihara, W., Molzon, T., Mori, D., Mzavia, H., Natori, R., Nardò, D., Nicolò, H., Nishiguchi, Y., Nishimura, W., Ootani, Panareo, Marco, A., Papa, R., Pazzi, G., Piredda, A., Popov, F., Renga, S., Ritt, M., Rossella, R., Sawada, M., Schneebeli, F., Sergiampietri, G., Signorelli, S., Suzuki, C., Topchyan, V., Tumakov, Y., Uchiyama, R., Valle, C., Voena, F., Xiao, S., Yamada, A., Yamamoto, S., Yamashita, Yudin, Y. u. V., and D., Zanello

Subjects
Lepton flavour violation, Muon decay
Abstract

A search for the decay μ+→e+γ, performed at PSI and based on data from the initial three months of operation of the MEG experiment, yields an upper limit on the branching ratio of BR(μ+→e+γ)2.8×10^−11 (90% C.L.). This corresponds to the measurement of positrons and photons from ~10^14 stopped μ+ decays by means of a superconducting positron spectrometer and a 900 litre liquid xenon photon detector.

Published
2010

17. Transparency of a 100 liter liquid xenon scintillation calorimeter prototype and measurement of its energy resolution for 55 MeV photons

Author

F. Sergiampietri, C. Bemporad, F. Cei, K. Terasawa, Yu. Yuri, S. Yamashita, S. Ritt, A. Baldini, D. Nicolò, W. Ootani, P. R. Kettle, M. Grassi, K. Kasami, S. Suzuki, Tadayoshi Doke, T. Haruyama, T. Mori, T. Yoshimura, R. Pazzi, M. Schneebeli, A. Maki, Ryu Sawada, H. Nishiguchi, K. Ozone, G. Signorelli, Satoshi Mihara, Masaki Yamashita, and A. Papa

Subjects
Physics, Scintillation, Photon, Physics::Instrumentation and Detectors, Physics::Medical Physics, Detector, Attenuation length, chemistry.chemical_element, Calorimeter, Nuclear physics, Full width at half maximum, Pion, Xenon, chemistry, High Energy Physics::Experiment
Abstract

We are developing a liquid xenon calorimeter for the MEG experiment. This experiment, to be performed at the Paul Scherrer Institut (PSI) in Villigen (CH), was designed by an Italian-Japanese-Russian-Swiss collaboration to search for the /spl mu//sup +//spl rarr/e/sup +//spl gamma/ decay, forbidden in the standard model of electroweak and strong interactions. The photon four momentum is to be measured by an innovative C-shaped 800 litres liquid xenon calorimeter read by more than 800 photo-multiplier tubes. An absorption length for Xe scintillation light larger than 100 cm has been measured. The performance of such a detector has been measured using a large volume prototype (100 litres) in a test beam at PSI, using high energy photons from decays of neutral pions from a charge exchange reaction of negative pions on protons. A resolution of 5% FWHM was obtained.

Published
2005
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18. Search for cosmic ray sources using muons detected by the MACRO experiment

Author

M. Ambrosio, R. Antolini, G. Auriemma, D. Bakari, A. Baldini, G.C. Barbarino, B.C. Barish, G. Battistoni, Y. Becherini, R. Bellotti, C. Bemporad, P. Bernardini, H. Bilokon, C. Bloise, C. Bower, M. Brigida, S. Bussino, F. Cafagna, M. Calicchio, D. Campana, M. Carboni, R. Caruso, S. Cecchini, F. Cei, V. Chiarella, B.C. Choudhary, S. Coutu, M. Cozzi, G. De Cataldo, H. Dekhissi, C. De Marzo, I. De Mitri, J. Derkaoui, M. De Vincenzi, A. Di Credico, O. Erriquez, C. Favuzzi, C. Forti, P. Fusco, G. Giacomelli, G. Giannini, N. Giglietto, M. Giorgini, M. Grassi, A. Grillo, F. Guarino, C. Gustavino, A. Habig, K. Hanson, R. Heinz, E. Iarocci, E. Katsavounidis, I. Katsavounidis, E. Kearns, H. Kim, S. Kyriazopoulou, E. Lamanna, C. Lane, D.S. Levin, P. Lipari, N.P. Longley, M.J. Longo, F. Loparco, F. Maaroufi, G. Mancarella, G. Mandrioli, A. Margiotta, A. Marini, D. Martello, A. Marzari-Chiesa, M.N. Mazziotta, D.G. Michael, P. Monacelli, T. Montaruli, M. Monteno, S. Mufson, J. Musser, D. Nicolò, R. Nolty, C. Orth, G. Osteria, O. Palamara, V. Patera, L. Patrizii, R. Pazzi, C.W. Peck, L. Perrone, S. Petrera, P. Pistilli, V. Popa, A. Rainò, J. Reynoldson, F. Ronga, A. Rrhioua, C. Satriano, E. Scapparone, K. Scholberg, A. Sciubba, P. Serra, M. Sioli, G. Sirri, M. Sitta, P. Spinelli, M. Spinetti, M. Spurio, R. Steinberg, J.L. Stone, L.R. Sulak, A. Surdo, G. Tarlè, V. Togo, M. Vakili, C.W. Walter, R. Webb, Ambrosio, M, Antolini, R, Auriemma, G, Bakari, D, Baldini, A, Barbarino, Gc, Barish, Bc, Battistoni, G, Becherini, Y, Bellotti, R, Bemporad, C, Bernardini, P, Bilokon, H, Bloise, C, Bower, C, Brigida, M, Bussino, Severino Angelo Maria, Cafagna, F, Calicchio, M, Campana, D, Carboni, M, Caruso, R, Cecchini, S, Cei, F, Chiarella, V, Choudhary, Bc, Coutu, S, Cozzi, M, De Cataldo, G, Dekhissi, H, De Marzo, C, De Mitri, I, Derkaoui, J, De Vincenzi, M, Di Credico, A, Erriquez, O, Favuzzi, C, Forti, C, Fusco, P, Giacomelli, G, Giannini, G, Giglietto, N, Giorgini, M, Grassi, M, Grillo, A, Guarino, F, Gustavino, C, Habig, A, Hanson, K, Heinz, R, Iarocci, E, Katsavounidis, E, Katsavounidis, I, Kearns, E, Kim, H, Kyriazopoulou, S, Lamanna, E, Lane, C, Levin, D, Lipari, P, Longley, Np, Longo, Mj, Loparco, F, Maaroufi, F, Mancarella, G, Mandrioli, G, Margiotta, A, Marini, A, Martello, D, Marzari Chiesa, A, Mazziotta, Mn, Michael, Dg, Monacelli, P, Montaruli, T, Monteno, M, Mufson, S, Musser, J, Nicolo, D, Nolty, R, Orth, C, Osteria, G, Palamara, O, Patera, V, Patrizii, L, Pazzi, R, Peck, Cw, Perrone, L, Petrera, S, Pistilli, P, Popa, V, Raino, A, Reynoldson, J, Ronga, F, Rrhioua, A, Satriano, C, Scapparone, E, Scholberg, K, Sciubba, A, Serra, P, Sioli, M, Sirri, G, Sitta, M, Spinelli, P, Spinetti, M, Spurio, M, Steinberg, R, Stone, Jl, Sulak, Lr, Surdo, A, Tarle, G, Togo, V, Vakili, M, Walter, Cw, Webb, R., Ambrosio M., Antolini R., Auriemma G., Bakari D., Baldini A., Barbarino G.C., Barish B.C., Battistoni G., Becherini Y., Bellotti R., Bemporad C., Bernardini P., Bilokon H., Bloise C., Bower C., Brigida M., Bussino S., Cafagna F., Calicchio M., Campana D., Carboni M., Caruso R., Cecchini S., Cei F., Chiarella V., Choudhary B.C., Coutu S., Cozzi M., de Cataldo G., Dekhissi H., de Marzo C., de Mitri I., Derkaoui J., de Vincenzi M., di Credico A., Erriquez O., Favuzzi C., Forti C., Fusco P., Giacomelli G., Giannini G., Giglietto N., Giorgini M., Grassi M., Grillo A., Guarino F., Gustavino C., Habig A., Hanson K., Heinz R., Iarocci E., Katsavounidis E., Katsavounidis I., Kearns E., Kim H., Kyriazopoulou S., Lamanna E., Lane C., Levin D.S., Lipari P., Longley N.P., Longo M.J., Loparco F., Maaroufi F., Mancarella G., Mandrioli G., Margiotta A., Marini A., Martello D., Marzari-Chiesa A., Mazziotta M.N., Michael D.G., Monacelli P., Montaruli T., Monteno M., Mufson S., Musser J., Nicolo D., Nolty R., Orth C., Osteria G., Palamara O., Patera V., Patrizii L., Pazzi R., Peck C.W., Perrone L., Petrera S., Pistilli P., Popa V., Raino A., Reynoldson J., Ronga F., Rrhioua A., Satriano C., Scapparone E., Scholberg K., Sciubba A., Serra P., Sioli M., Sirri G., Sitta M., Spinelli P., Spinetti M., Spurio M., Steinberg R., Stone J.L., Sulak L.R., Surdo A., Tarle G., Togo V., Vakili M., Walter C.W., Webb R., M., Ambrosio, Bernardini, Paolo, Martello, Daniele, DE MITRI, Ivan, Perrone, Lorenzo, Mancarella, Giovanni, Macro, Collaboration, Barbarino, Giancarlo, and Guarino, Fausto

Subjects
Particle physics, Underground muon, macro, underground muons, x-binary sources, γ-ray sources, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, Astrophysics, X-binary source, High Energy Physics - Phenomenology (hep-ph), Macro, gamma-ray sources, Physics, Muon, Cosmic ray muons, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Astronomy and Astrophysics, MACRO, X-binary sources, High Energy Physics - Phenomenology, High Energy Physics::Experiment
Abstract

The MACRO underground detector at Gran Sasso Laboratory recorded 60 million secondary cosmic ray muons from February 1989 until December 2000. Different techniques were used to analyze this sample in search for density excesses from astrophysical point-like sources. No evidence for DC excesses for any source in an all-sky survey is reported. In addition, searches for muon excess correlated with the known binary periods of Cygnus X-3 and Hercules X-1, and searches for statistically significant bursting episodes from known gamma ray sources are also proved negative., Comment: 18 pages, 12 figures

Published
2003

19. Measurement of the residual energy of muons in the Gran Sasso underground laboratories

Author

M. Ambrosio, R. Antolini, A. Baldini, G.C. Barbarino, B.C. Barish, G. Battistoni, Y. Becherini, R. Bellotti, C. Bemporad, P. Bernardini, H. Bilokon, C. Bower, M. Brigida, S. Bussino, F. Cafagna, M. Calicchio, D. Campana, M. Carboni, R. Caruso, S. Cecchini, F. Cei, V. Chiarella, B.C. Choudhary, S. Coutu, M. Cozzi, G. De Cataldo, H. Dekhissi, C. De Marzo, I. De Mitri, J. Derkaoui, M. De Vincenzi, A. Di Credico, O. Erriquez, C. Favuzzi, C. Forti, P. Fusco, G. Giacomelli, G. Giannini, N. Giglietto, M. Giorgini, M. Grassi, A. Grillo, F. Guarino, C. Gustavino, A. Habig, K. Hanson, R. Heinz, E. Iarocci, E. Katsavounidis, I. Katsavounidis, E. Kearns, H. Kim, S. Kyriazopoulou, E. Lamanna, C. Lane, D.S. Levin, P. Lipari, N.P. Longley, M.J. Longo, F. Loparco, G. Mancarella, G. Mandrioli, A. Margiotta, A. Marini, D. Martello, A. Marzari-Chiesa, M.N. Mazziotta, D.G. Michael, P. Monacelli, T. Montaruli, M. Monteno, S. Mufson, J. Musser, D. Nicolò, R. Nolty, C. Orth, G. Osteria, O. Palamara, V. Patera, L. Patrizii, R. Pazzi, C.W. Peck, L. Perrone, S. Petrera, P. Pistilli, V. Popa, A. Rainò, J. Reynoldson, F. Ronga, C. Satriano, E. Scapparone, K. Scholberg, A. Sciubba, P. Serra, M. Sioli, G. Sirri, M. Sitta, P. Spinelli, M. Spinetti, M. Spurio, R. Steinberg, J.L. Stone, L.R. Sulak, A. Surdo, G. Tarlè, M. Vakili, C.W. Walter, R. Webb, Ambrosio M., Antolini R., Baldini A., Barbarino G.C., Barish B.C., Battistoni G., Becherini Y., Bellotti R., Bemporad C., Bernardini P., Bilokon H., Bower C., Brigida M., Bussino S., Cafagna F., Calicchio M., Campana D., Carboni M., Caruso R., Cecchini S., Cei F., Chiarella V., Choudhary B.C., Coutu S., Cozzi M., de Cataldo G., Dekhissi H., de Marzo C., de Mitri I., Derkaoui J., de Vincenzi M., di Credico A., Erriquez O., Favuzzi C., Forti C., Fusco P., Giacomelli G., Giannini G., Giglietto N., Giorgini M., Grassi M., Grillo A., Guarino F., Gustavino C., Habig A., Hanson K., Heinz R., Iarocci E., Katsavounidis E., Katsavounidis I., Kearns E., Kim H., Kyriazopoulou S., Lamanna E., Lane C., Levin D.S., Lipari P., Longley N.P., Longo M.J., Loparco F., Mancarella G., Mandrioli G., Margiotta A., Marini A., Martello D., Marzari-Chiesa A., Mazziotta M.N., Michael D.G., Monacelli P., Montaruli T., Monteno M., Mufson S., Musser J., Nicolo D., Nolty R., Orth C., Osteria G., Palamara O., Patera V., Patrizii L., Pazzi R., Peck C.W., Perrone L., Petrera S., Pistilli P., Popa V., Raino A., Reynoldson J., Ronga F., Satriano C., Scapparone E., Scholberg K., Sciubba A., Serra P., Sioli M., Sirri G., Sitta M., Spinelli P., Spinetti M., Spurio M., Steinberg R., Stone J.L., Sulak L.R., Surdo A., Tarle G., Vakili M., Walter C.W., Webb R., Ambrosio, M, Antolini, R, Baldini, A, Barbarino, Gc, Barish, Bc, Battistoni, G, Becherini, Y, Bellotti, R, Bemporad, C, Bernardini, P, Bilokon, H, Bower, C, Brigida, M, Bussino, Severino Angelo Maria, Cafagna, F, Calicchio, M, Campana, D, Carboni, M, Caruso, R, Cecchini, S, Cei, F, Chiarella, V, Choudhary, Bc, Coutu, S, Cozzi, M, De Cataldo, G, Dekhissi, H, De Marzo, C, De Mitri, I, Derkaoui, J, De Vincenzi, M, Di Credico, A, Erriquez, O, Favuzzi, C, Forti, C, Fusco, P, Giacomelli, G, Giannini, G, Giglietto, N, Giorgini, M, Grassi, M, Grillo, H, Guarino, F, Gustavino, C, Habig, A, Hanson, K, Heinz, R, Iarocci, E, Katsavounidis, E, Katsavounidis, I, Kearns, E, Kim, H, Kyriazopoulou, S, Lamanna, E, Lane, C, Levin, D, Lipari, P, Longley, Np, Longo, Mj, Loparco, F, Mancarella, G, Mandrioli, G, Margiotta, A, Marini, A, Martello, D, Marzari Chiesa, A, Mazziotta, Mn, Michael, Dg, Monacelli, P, Montaruli, T, Monteno, M, Mufson, S, Musser, J, Nicolo, D, Nolty, R, Orth, C, Osteria, G, Palamara, O, Patera, V, Patrizii, L, Pazzi, R, Peck, Cw, Perrone, L, Petrera, S, Pistilli, P, Popa, V, Raino, A, Reynoldson, J, Ronga, F, Satraino, C, Scapparone, E, Scholberg, K, Sciubba, A, Serra, P, Sioli, M, Sirri, G, Sitta, M, Spinelli, P, Spinetti, M, Spurio, M, Steinberg, R, Stone, Jl, Sulak, Lr, Surdo, A, Tarle, G, Vakili, M, Walter, Cw, Webb, R., Bernardini, Paolo, Martello, Daniele, DE MITRI, Ivan, Perrone, Lorenzo, Mancarella, Giovanni, and Macro, Collaboration

Subjects
Physics, Range (particle radiation), Particle physics, Muon, Physics::Instrumentation and Detectors, Detector, FOS: Physical sciences, Astronomy and Astrophysics, MACRO, High Energy Physics - Experiment, Gran Sasso, Nuclear physics, High Energy Physics - Experiment (hep-ex), Transition radiation detector, Overburden, High Energy Physics::Experiment, Residual energy
Abstract

The MACRO detector was located in the Hall B of the Gran Sasso underground Laboratories under an average rock overburden of 3700 hg/cm^2. A transition radiation detector composed of three identical modules, covering a total horizontal area of 36 m^2, was installed inside the empty upper part of the detector in order to measure the residual energy of muons. This paper presents the measurement of the residual energy of single and double muons crossing the apparatus. Our data show that double muons are more energetic than single ones. This measurement is performed over a standard rock depth range from 3000 to 6500 hg/cm^2., 28 pages, 9 figures

Published
2003

20. P931: PROSPECTIVE OBSERVATIONAL MULTICENTER STUDY OF GAUCHER DISEASE PREVALENCE IN PATIENTS AFFECTED BY MONOCLONAL GAMMOPATHY OF UNDETERMINED SIGNIFICANCE

Author

G. Giuffrida, U. Markovic, C. Conticello, D. Nicolosi, V. Calafiore, A. Romano, A. Condorelli, S. Grasso, A. Duminuco, M. Calagna, A. Nardo, C. Riccobene, B. Esposito, U. Consoli, V. Di Giacomo, S. Neri, M. R. Cingari, G. Iaria, V. Innao, M. Spina, J. Gentile, C. Zizzo, G. Duro, and F. Di Raimondo

Subjects
Diseases of the blood and blood-forming organs, RC633-647.5
Published
2022
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21. A clock network for geodesy and fundamental science

Author

C. Lisdat, G. Grosche, N. Quintin, C. Shi, S.M.F. Raupach, C. Grebing, D. Nicolodi, F. Stefani, A. Al-Masoudi, S. Dörscher, S. Häfner, J.-L. Robyr, N. Chiodo, S. Bilicki, E. Bookjans, A. Koczwara, S. Koke, A. Kuhl, F. Wiotte, F. Meynadier, E. Camisard, M. Abgrall, M. Lours, T. Legero, H. Schnatz, U. Sterr, H. Denker, C. Chardonnet, Y. Le Coq, G. Santarelli, A. Amy-Klein, R. Le Targat, J. Lodewyck, O Lopez, and P.-E. Pottie

Subjects
Science
Abstract

Comparing the frequency of two distant optical clocks will enable sensitive tests of fundamental physics. Here, the authors compare two strontium optical-lattice clocks 690 kilometres apart to a degree of accuracy that is limited only by the uncertainty of the individual clocks themselves.

Published
2016
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22. The FDM readout system for the TES bolometers of the SWIPE instrument on the balloon-borne LSPE experiment

Author

A. M. Baldini, A. Iezzi, M. Grassi, M. Venturini, D. Nicolò, F. Cei, L. Galli, G. Gallucci, G. Signorelli, Y. Venturini, D. Vaccaro, F. Spinella, and M. Incagli

Subjects
Physics::Instrumentation and Detectors, Cosmic microwave background, Frequency domain multiplexing, LSPE, Superconducting inductors, SWIPE, TES bolometers, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Computer Science Applications1707 Computer Vision and Pattern Recognition, Applied Mathematics, Electrical and Electronic Engineering, Astrophysics::Cosmology and Extragalactic Astrophysics, 02 engineering and technology, 01 natural sciences, law.invention, 010309 optics, Resonator, Frequency comb, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electronic, Optical and Magnetic Materials, Physics, business.industry, Linear polarization, 020208 electrical & electronic engineering, Detector, Bolometer, Astrophysics::Instrumentation and Methods for Astrophysics, SwIPe, Capacitor, business, Telecommunications, Microwave
Abstract

We present the design and first tests of a prototype readout for the SWIPE instrument onboard the LSPE balloon-borne experiment. LSPE aims at measuring the linear polarization of the Cosmic Microwave Background (CMB) at large angular scales, to find the imprint of inflation on the B-mode CMB polarization. The SWIPE instrument hosts two focal planes hosting 163 TES Au/Mo spiderweb bolometers each, cooled at 0.3 K for the detection of microwave frequencies of 140, 220 and 240 GHz. To read all the detectors, a 16 channel frequency domain multiplexing readout system has been devised, consisting of LC resonators composed of custom Nb superconducting inductors and commercial SMD capacitors. A set-up consisting of 14 LC resonators shows that we can accommodate 16 channels in the frequency range between 200 kHz and 1.6 MHz, since the necessary line-widths can be achieved. A preliminary firmware for the generation and read-out of the biasing frequency comb is also discussed.

23. Measurement of the radiative decay of polarized muons in the MEG experiment

Author

S. Nakaura, K. Ieki, G. M. A. Lim, P.-R. Kettle, B.I. Khazin, N. V. Khomutov, G. Signorelli, A. M. Baldini, F. Tenchini, G. Piredda, Yuki Fujii, Wataru Ootani, M. De Gerone, Yusuke Uchiyama, E. Baracchini, W. R. Molzon, T. Haruyama, Z. Hodge, A. Mtchedlishvili, Malte Hildebrandt, Michele Biasotti, G. F. Tassielli, S. Ogawa, G. Chiarello, D. N. Grigoriev, A. D’Onofrio, A. Papa, A. de Bari, Akira Yamamoto, Z. You, F. Berg, C. Voena, G. Rutar, E. Ripiccini, A. Graziosi, C. Bemporad, Ryu Sawada, T. Iwamoto, S. Dussoni, Toshinori Mori, F. Ignatov, Yu Bao, A. S. Korenchenko, G. Pizzigoni, F. Sergiampietri, D. Nicolò, Marco Grassi, A. Pepino, P. W. Cattaneo, F. Renga, Stefan Ritt, Andrey Popov, M. Panareo, Hajime Nishiguchi, G. Cavoto, Yu.V. Yudin, Tae Im Kang, L. Galli, M. Rossella, Fabrizio Cei, Satoshi Mihara, N. P. Kravchuk, C. Chiri, D. Kaneko, F. Grancagnolo, K. Yoshida, M. Venturini, M. Nishimura, Gianluigi Boca, Flavio Gatti, Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, Gianluigi, Chiri, Claudio, de Bari, A., De Gerone, M., D’Onofrio, A., Dussoni, S., Fujii, Y., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Graziosi, A., Grigoriev, D. N., Haruyama, T., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwamoto, T., Kaneko, D., Kang, Tae Im, Kettle, P. R., Khazin, B. I., Khomutov, N., Korenchenko, A., Kravchuk, N., Lim, G. M. A., Mihara, S., Molzon, W., Mori, Toshinori, Mtchedlishvili, A., Nakaura, S., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Ootani, W., Panareo, Marco, Papa, A., Pepino, Aurora, Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, GIOVANNI FRANCESCO, Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., and Yudin, Y. u. V.

Subjects
Particle physics, Antiparticle, Physics - Instrumentation and Detectors, Engineering (miscellaneous), Physics and Astronomy (miscellaneous), muon physics, FOS: Physical sciences, Elementary particle, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Particle decay, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, MC Simulation, SM Expectation, Muon Decay, Individual Uncertainty Source, Photon Energy Spectrum, Photon Detection Efficiency, Neutral Pion, Total Covariance Matrix, Acceptance Factor, Signal Window, QED Correction, Liquid Xenon, Kinematic Region, 010306 general physics, Physics, Muon, 010308 nuclear & particles physics, Branching fraction, Instrumentation and Detectors (physics.ins-det), Orientation (vector space), High Energy Physics - Phenomenology, High Energy Physics::Experiment, Dimensionless quantity, Lepton
Abstract

We studied the radiative muon decay $\mu^+ \to e^+\nu\bar{\nu}\gamma$ by using for the first time an almost fully polarized muon source. We identified a large sample (~13000) of these decays in a total sample of 1.8x10^14 positive muon decays collected in the MEG experiment in the years 2009--2010 and measured the branching ratio B($\mu^+ \to e^+\nu\bar{\nu}\gamma$) = (6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV and E_{\gamma} > 40 MeV, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for $\mu^+ \to e^+\gamma$ process., Comment: 8 pages, 7 figures. Added an introduction to NLO calculation which was recently calculated. Published version

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24. The MEG detector for μ +→e+ γ decay search

Author

F. Renga, C Topchyan, Angela Papa, A. Graziosi, Yasuhiro Nishimura, Donato Nicolo, Bi Khazin, Hajime Nishiguchi, Am Baldini, M. Rossella, N. P. Kravchuk, E. Ripiccini, G. M. A. Lim, Y. Hisamatsu, S. Galeotti, N. Curalli, Malte Hildebrandt, Luca Galli, A.S. Popov, D. Kaneko, K. Ozone, D. Mzavia, M. De Gerone, Roberto Di Nardo, C. Cerri, M. Corbo, F. Tenchini, G. Piredda, S. Yamada, Giovanni Signorelli, M. Schneebeli, H. Natori, C. Bemporad, S. Yamamoto, A. S. Korenchenko, Flavio Gatti, L. Del Frate, Ryu Sawada, Pw Cattaneo, D. Zanello, R. Valle, Satoshi Mihara, T. Iwamoto, W. R. Molzon, M. Panareo, K. Fratini, Pr Kettle, E Baracchini, Fabrizio Cei, F.V. Ignatov, X. Bai, Marco Grassi, S. Doke, C. Voena, F. Morsani, F. Raffaelli, Katsuyu Kasami, R. Pazzi, Wataru Ootani, Yuki Fujii, G. Gallucci, Satoru Yamashita, F Xiao, G. Cavoto, Gianluigi Boca, A. Maki, A. de Bari, Tomiyoshi Haruyama, Stefan Ritt, Yv Yudin, J. Adam, O. Kiselev, F. Sergiampietri, D.N. Grigoriev, S. Suzuki, Takehiko Mori, Yusuke Uchiyama, S. Dussoni, B Golden, J. Egger, J., Adam, X., Bai, A. M., Baldini, E., Baracchini, C., Bemporad, G., Boca, P. W., Cattaneo, G., Cavoto, F., Cei, C., Cerri, M., Corbo, N., Curalli, A., De Bari, M., De Gerone, L., Del Frate, S., Doke, S., Dussoni, J., Egger, K., Fratini, Y., Fujii, L., Galli, S., Galeotti, G., Gallucci, F., Gatti, B., Golden, M., Grassi, A., Graziosi, D. N., Grigoriev, T., Haruyama, M., Hildebrandt, Y., Hisamatsu, F., Ignatov, T., Iwamoto, D., Kaneko, K., Kasami, P. R., Kettle, B. I., Khazin, O., Kiselev, A., Korenchenko, N., Kravchuk, G., Lim, A., Maki, S., Mihara, W., Molzon, T., Mori, F., Morsani, D., Mzavia, R., Nardò, H., Natori, D., Nicolò, H., Nishiguchi, Y., Nishimura, W., Ootani, K., Ozone, Panareo, Marco, A., Papa, R., Pazzi, G., Piredda, A., Popov, F., Raffaelli, F., Renga, E., Ripiccini, S., Ritt, M., Rossella, R., Sawada, M., Schneebeli, F., Sergiampietri, G., Signorelli, S., Suzuki, F., Tenchini, C., Topchyan, Y., Uchiyama, R., Valle, C., Voena, F., Xiao, S., Yamada, S., Yamamoto, S., Yamashita, Yudin, Y. u. V., and D., Zanello

Subjects
Physics, Antiparticle, Muon, Spectrometer, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Photon energy, Charged Lepton Flavor Violation, Particle detector, Lepton, Nuclear physics, Particle decay, Positron, Physics::Accelerator Physics, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract

The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay μ +→e+ γ by using one of the most intense continuous μ + beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus., The European Physical Journal C, 73 (4), ISSN:1434-6044, ISSN:1434-6052

Published
2013

25. Search for lightly ionizing particles with the MACRO detector

Author

Mario Sitta, C. Gustavino, B. C. Choudhary, S. Coutu, A. Marzari-Chiesa, R.M. Heinz, F. Cei, L. Satta, D. G. Michael, Kate Scholberg, F.J. Ronga, Marco Monteno, S. Petrera, P. Bernardini, L. R. Sulak, V. Togo, G. Mandrioli, M. Vakili, R. Steinberg, M. N. Mazziotta, A. Di Credico, P. Serra, D. Campana, P. Pistilli, M. Ambrosio, S. Kyriazopoulou, R. Pazzi, J. L. Stone, D. Bakari, M. Carboni, R. C. Webb, F. Loparco, C. Bloise, M. Brigida, P. Fusco, Andrea Carlo Marini, Paolo Lipari, L. Perrone, V. Chiarella, Barry C. Barish, Roberto Bellotti, Giuseppe Osteria, V. Popa, Maurizio Spurio, M. Ouchrif, C. W. Peck, H. Dekhissi, P. Monacelli, Donato Nicolo, F. Cafagna, I. De Mitri, Ioannis Katsavounidis, C. W. Walter, C. R. Bower, L. Patrizii, Alec Habig, M. Grassi, E. Vilela, C. De Marzo, J. Derkaoui, J. A. Musser, G. Mancarella, J. Reynoldson, P. Spinelli, A. Rainò, Kael Hanson, Teresa Montaruli, Maximiliano Sioli, C. Bemporad, Np Longley, C. Orth, F. Guarino, C. E. Lane, V. Bisi, Lindsey Gray, D. Levin, G. Battistoni, R. Nolty, E. Iarocci, M. Calicchio, Annarita Margiotta, Halina Bilokon, Erik Katsavounidis, S. L. Mufson, F. Maaroufi, M. J. Longo, D. Martello, C. Forti, G. Giacomelli, L. Miller, S P Mikheyev, M. Spinetti, M. Giorgini, E. Kearns, C. Okada, E. Lamanna, C. Satriano, G. Auriemma, Gregory Tarle, G. C. Barbarino, Eugenio Scapparone, M. De Vincenzi, G. Giannini, N. Giglietto, G. de Cataldo, O. Erriquez, A. A. Grillo, Hyun-Chul Kim, R. Antolini, S. Cecchini, C. Favuzzi, A. Surdo, Vincenzo Patera, A. Sciubba, A. Baldini, O. Palamara, Severino Angelo Maria Bussino, M., Ambrosio, R., Antolini, G., Auriemma, D., Bakari, A., Baldini, Barbarino, Giancarlo, B., Barish, G., Battistoni, R., Bellotti, C., Bemporad, P., Bernardini, H., Bilokon, V., Bisi, C., Bloise, C., Bower, M., Brigida, S., Bussino, F., Cafagna, M., Calicchio, D., Campana, M., Carboni, S., Cecchini, F., Cei, V., Chiarella, B., Choudhary, S., Coutu, G., De Cataldo, H., Dekhissi, C., De Marzo, I., De Mitri, J., Derkaoui, M., De Vincenzi, A., Di Credico, O., Erriquez, C., Favuzzi, C., Forti, P., Fusco, G., Giacomelli, G., Giannini, N., Giglietto, M., Giorgini, M., Grassi, L., Gray, A., Grillo, Guarino, Fausto, C., Gustavino, A., Habig, K., Hanson, R., Heinz, E., Iarocci, E., Katsavounidi, I., Katsavounidi, E., Kearn, H., Kim, S., Kyriazopoulou, E., Lamanna, C., Lane, D., Levin, P., Lipari, N., Longley, M., Longo, F., Loparco, F., Maaroufi, G., Mancarella, G., Mandrioli, A., Margiotta, A., Marini, D., Martello, A., Marzari Chiesa, M., Mazziotta, D., Michael, S., Mikheyev, L., Miller, P., Monacelli, T., Montaruli, M., Monteno, S., Mufson, J., Musser, D., Nicolò, R., Nolty, C., Orth, C., Okada, G., Osteria, M., Ouchrif, O., Palamara, V., Patera, L., Patrizii, R., Pazzi, C., Peck, L., Perrone, S., Petrera, P., Pistilli, V., Popa, A., Rainò, J., Reynoldson, F., Ronga, C., Satriano, L., Satta, E., Scapparone, K., Scholberg, A., Sciubba, P., Serra, M., Sioli, M., Sitta, P., Spinelli, M., Spinetti, M., Spurio, R., Steinberg, J., Stone, L., Sulak, A., Surdo, G., Tarlè, V., Togo, M., Vakili, E., Vilela, C., Walter, R., Webb, Ambrosio, M, Antolini, R, Auriemma, G, Bakari, D, Baldini, A, Barbarino, Gc, Barish, Bc, Battistoni, G, Bellotti, R, Bemporad, C, Bernardini, P, Bilokon, H, Bisi, V, Bloise, C, Bower, C, Brigida, M, Bussino, Severino Angelo Maria, Cafagna, F, Calicchio, M, Campana, D, Carboni, M, Cecchini, S, Cei, F, Chiarella, V, Choudhary, Bc, Coutu, S, De Cataldo, G, Dekhissi, H, De Marzo, C, De Mitri, I, Derkaoui, J, De Vincenzi, M, Di Credico, A, Erriquez, O, Favuzzi, C, Forti, C, Fusco, P, Giacomelli, G, Giannini, G, Giglietto, N, Giorgini, M, Grassi, M, Gray, L, Grillo, A, Guarino, F, Gustavino, C, Habig, A, Hanson, K, Heinz, R, Iarocci, E, Katsavounidis, E, Katsavounidis, I, Kearns, E, Kim, H, Kyriazopoulou, S, Lamanna, E, Lane, C, Levin, D, Lipari, P, Longley, Np, Longo, Mj, Loparco, F, Maaroufi, F, Mancarella, G, Mandrioli, G, Margiotta, A, Marini, A, Martello, D, Marzari Chiesa, A, Mazziotta, Mn, Michael, Dg, Mikheyev, S, Miller, L, Monacelli, P, Montaruli, T, Monteno, M, Mufson, S, Musser, J, Nicolo, D, Nolty, R, Orth, C, Okada, C, Osteria, G, Ouchrif, M, Palamara, O, Patera, V, Patrizii, L, Pazzi, R, Peck, Cw, Perrone, L, Petrera, S, Pistilli, P, Popa, V, Raino, A, Reynoldson, J, Ronga, F, Satriano, C, Satta, L, Scapparone, E, Scholberg, K, Sciubba, A, Serra, P, Sioli, M, Sitta, M, Spinelli, P, Spinetti, M, Spurio, M, Steinberg, R, Stone, Jl, Sulak, Lr, Surdo, A, Tarle, G, Togo, V, Vakili, M, Vilela, E, Walter, Cw, Webb, R., Perrone, Lorenzo, Macro, Collaboration, G. C., Barbarino, B. C., Barish, Bernardini, Paolo, B. C., Choudhary, G. D., Cataldo, C. D., Marzo, DE MITRI, Ivan, M. D., Vincenzi, A. D., Credico, F., Guarino, D. S., Levin, N. P., Longley, M. J., Longo, Mancarella, Giovanni, Martello, Daniele, M. N., Mazziotta, D. G., Michael, D., Nicolo, C. W., Peck, A., Raino, J. L., Stone, L. R., Sulak, G., Tarle, C. W., Walter, Ambrosio M., Antolini R., Auriemma G., Bakari D., Baldini A., Barbarino G.C., Barish B.C., Battistoni G., Bellotti R., Bemporad C., Bernardini P., Bilokon H., Bisi V., Bloise C., Bower C., Brigida M., Bussino S., Cafagna F., Calicchio M., Campana D., Carboni M., Cecchini S., Cei F., Chiarella V., Choudhary B.C., Coutu S., De Cataldo G., Dekhissi H., De Marzo C., De Mitri I., Derkaoui J., De Vincenzi M., Di Credico A., Erriquez O., Favuzzi C., Forti C., Fusco P., Giacomelli G., Giannini G., Giglietto N., Giorgini M., Grassi M., Gray L., Grillo A., Guarino F., Gustavino C., Habig A., Hanson K., Heinz R., Iarocci E., Katsavounidis E., Katsavounidis I., Kearns E., Kim H., Kyriazopoulou S., Lamanna E., Lane C., Levin D.S., Lipari P., Longley N.P., Longo M.J., Loparco F., Maaroufi F., Mancarella G., Mandrioli G., Margiotta A., Marini A., Martello D., Marzari-Chiesa A., Mazziotta M.N., Michael D.G., Mikheyev S., Miller L., Monacelli P., Montaruli T., Monteno M., Mufson S., Musser J., Nicolo D., Nolty R., Orth C., Okada C., Osteria G., Ouchrif M., Palamara O., Patera V., Patrizii L., Pazzi R., Peck C.W., Perrone L., Petrera S., Pistilli P., Popa V., Raino A., Reynoldson J., Ronga F., Satriano C., Satta L., Scapparone E., Scholberg K., Sciubba A., Serra P., Sioli M., Sitta M., Spinelli P., Spinetti M., Spurio M., Steinberg R., Stone J.L., Sulak L.R., Surdo A., Tarle G., Togo V., Vakili M., Vilela E., Walter C.W., and Webb R.

Subjects
Physics, Nuclear and High Energy Physics, Muon, Flux, FOS: Physical sciences, Charge (physics), Elementary particle, Cosmic ray, MACRO, Electron, Electric charge, Gran Sasso, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Ionization, Atomic physics
Abstract

A search for lightly ionizing particles has been performed with the MACRO detector. This search was sensitive to particles with charges between $\fractional{5}$$e$ and close to the charge of an electron, with $\beta$ between approximately 0.25 and 1.0. Unlike previous searches both single track events and tracks buried within high multiplicity muon showers were examined. In a period of approximately one year no candidates were observed. Assuming an isotropic flux, for the single track sample this corresponds to a 90% C.L. upper flux limit $\Phi \leq 9.2 \times 10^{-15} cm^{-2} sec^{-1} sr^{-1}$ ., Comment: 15 pages, 7 figures, to be submitted to Phys. Rev. D.; References Added

Published
2000

26. Low energy atmospheric muon neutrinos in MACRO

Author

I. De Mitri, C. R. Bower, L. Patrizii, C. De Marzo, F. Cei, S. Cecchini, J. A. Musser, F. Maaroufi, C. Favuzzi, Paolo Lipari, A. Di Credico, Np Longley, C. E. Lane, J. Derkaoui, V. Popa, S. Kyriazopoulou, D. Bakari, P. Spinelli, M. Giorgini, Kael Hanson, Erik Katsavounidis, O. Erriquez, R. C. Webb, C. W. Peck, S. L. Mufson, M. Ouchrif, D. Martello, G. de Cataldo, Mario Sitta, C. Gustavino, E. Kearns, M. Brigida, Roberto Bellotti, J. L. Stone, G. Sirri, M. Carboni, Donato Nicolo, D. Campana, F. Loparco, P. Pistilli, C. Forti, C. Bloise, P. Serra, F. Cafagna, P. Fusco, G. Giacomelli, M. Calicchio, R. Pazzi, E. Iarocci, Halina Bilokon, Annarita Margiotta, Andrea Carlo Marini, S P Mikheyev, A. Surdo, Severino Angelo Maria Bussino, Maurizio Spurio, L. Satta, E. Vilela, D. G. Michael, Michael J. Longo, A. Marzari-Chiesa, L. R. Sulak, G. Battistoni, Marco Monteno, G. Giannini, G. Mandrioli, Lindsey Gray, M. Ambrosio, R. Nolty, M. Spinetti, Ioannis Katsavounidis, M. Grassi, M. N. Mazziotta, R. Steinberg, Kate Scholberg, R.M. Heinz, P. Bernardini, V. Chiarella, F. Guarino, N. Giglietto, Giuseppe Osteria, V. Bisi, P. Monacelli, Vincenzo Patera, S. Coutu, A. Sciubba, Hyun-Chul Kim, A. A. Grillo, C. Orth, A. Baldini, O. Palamara, B. C. Choudhary, V. Togo, C. W. Walter, A. Rainò, R. Antolini, S. Petrera, C. Bemporad, G. Mancarella, J. Reynoldson, Teresa Montaruli, Frederic Jean Ronga, L. Perrone, Barry C. Barish, H. Dekhissi, L. Miller, D. Levin, M. Vakili, G. C. Barbarino, Maximiliano Sioli, Eugenio Scapparone, M. De Vincenzi, C. Satriano, G. Auriemma, Gregory Tarle, Alec Habig, E. Lamanna, M., Ambrosio, R., Antolini, G., Auriemma, D., Bakari, A., Baldini, Barbarino, Giancarlo, B. C., Barish, G., Battistoni, R., Bellotti, C., Bemporad, P., Bernardini, H., Bilokon, V., Bisi, C., Bloise, C., Bower, M., Brigida, S., Bussino, F., Cafagna, M., Calicchio, D., Campana, M., Carboni, S., Cecchini, F., Cei, V., Chiarella, B. C., Choudhary, S., Coutu, G., De Cataldo, H., Dekhissi, C., De Marzo, I., De Mitri, J., Derkaoui, M., De Vincenzi, A., Di Credico, O., Erriquez, C., Favuzzi, C., Forti, P., Fusco, G., Giacomelli, G., Giannini, N., Giglietto, M., Giorgini, M., Grassi, L., Gray, A., Grillo, Guarino, Fausto, C., Gustavino, A., Habig, K., Hanson, R., Heinz, E., Iarocci, E., Katsavounidi, I., Katsavounidi, E., Kearn, H., Kim, S., Kyriazopoulou, E., Lamanna, C., Lane, D. S., Levin, P., Lipari, N. P., Longley, M. J., Longo, F., Loparco, F., Maaroufi, G., Mancarella, G., Mandrioli, A., Margiotta, A., Marini, D., Martello, A., Marzari Chiesa, M. N., Mazziotta, D. G., Michael, S., Mikheyev, L., Miller, P., Monacelli, T., Montaruli, M., Monteno, S., Mufson, J., Musser, D., Nicolò, R., Nolty, C., Orth, G., Osteria, M., Ouchrif, O., Palamara, V., Patera, L., Patrizii, R., Pazzi, C. W., Peck, L., Perrone, S., Petrera, P., Pistilli, V., Popa, A., Rainò, J., Reynoldson, F., Ronga, C., Satriano, L., Satta, E., Scapparone, K., Scholberg, A., Sciubba, P., Serra, M., Sioli, G., Sirri, M., Sitta, P., Spinelli, M., Spinetti, M., Spurio, R., Steinberg, J. L., Stone, L. R., Sulak, A., Surdo, G., Tarlè, V., Togo, M., Vakili, E., Vilela, C. W., Walter, R., Webb, Ambrosio M., Antolini R., Auriemma G., Bakari D., Baldini A., Barbarino G.C., Barish B.C., Battistoni G., Bellotti R., Bemporad C., Bernardini P., Bilokon H., Bisi V., Bloise C., Bower C., Brigida M., Bussino S., Cafagna F., Calicchio M., Campana D., Carboni M., Cecchini S., Cei F., Chiarella V., Choudhary B.C., Coutu S., De Cataldo G., Dekhissi H., De Marzo C., De Mitri I., Derkaoui J., De Vincenzi M., Di Credico A., Erriquez O., Favuzzi C., Forti C., Fusco P., Giacomelli G., Giannini G., Giglietto N., Giorgini M., Grassi M., Gray L., Grillo A., Guarino F., Gustavino C., Habig A., Hanson K., Heinz R., Iarocci E., Katsavounidis E., Katsavounidis I., Kearns E., Kim H., Kyriazopoulou S., Lamanna E., Lane C., Levin D.S., Lipari P., Longley N.P., Longo M.J., Loparco F., Maaroufi F., Mancarella G., Mandrioli G., Margiotta A., Marini A., Martello D., Marzari-Chiesa A., Mazziotta M.N., Michael D.G., Mikheyev S., Miller L., Monacelli P., Montaruli T., Monteno M., Mufson S., Musser J., Nicolom D., Nolty R., Orth C., Osteria G., Ouchrif M., Palamara O., Patera V., Patrizii L., Pazzi R., Peck C.W., Perrone L., Petrera S., Pistilli P., Popa V., Rainoa A., Reynoldson J., Ronga F., Satriano C., Satta L., Scapparone E., Scholberg K., Sciubba A., Serra P., Sioli M., Sirri G., Sitta M., Spinelli P., Spinetti M., Spurio M., Steinberg R., Stone J.L., Sulak L.R., Surdo A., Tarle G., Togo V., Vakili M., Vilela E., Walter C.W., Webb R., Bernardini, Paolo, Martello, Daniele, DE MITRI, Ivan, Perrone, Lorenzo, Macro, Collaboration, Ambrosio, M, Antolini, R, Auriemma, G, Bakari, D, Baldini, A, Barbarino, Gc, Barish, Bc, Battistoni, G, Bellotti, R, Bemporad, C, Bernardini, P, Bilokon, H, Bisi, V, Bloise, C, Bower, C, Brigida, M, Bussino, Severino Angelo Maria, Cafagna, F, Calicchio, M, Campana, D, Carboni, M, Cecchini, S, Cei, F, Chiarella, V, Choudhary, Bc, Coutu, S, De Cataldo, G, Dekhissi, H, De Marzo, C, De Mitri, I, Derkaoui, J, De Vincenzi, M, Di Credico, A, Erriquez, O, Favuzzi, C, Forti, C, Fusco, P, Giacomelli, G, Giannini, G, Giglietto, N, Giorgini, M, Grassi, M, Gray, L, Grillo, A, Guarino, F, Gustavino, C, Habig, A, Hanson, K, Heinz, R, Iarocci, E, Katsavounidis, E, Katsavounidis, I, Kearns, E, Kim, H, Kyriazopoulou, S, Lamanna, E, Lane, C, Levin, D, Lipari, P, Longley, Np, Longo, Mj, Loparco, F, Maaroufi, F, Mancarella, G, Mandrioli, G, Margiotta, A, Marini, A, Martello, D, Marzari Chiesa, A, Mazziotta, Mn, Michael, Dg, Mikheyev, S, Miller, L, Monacelli, P, Montaruli, T, Monteno, M, Mufson, S, Musser, J, Nicolo, D, Nolty, R, Orth, C, Osteria, G, Ouchrif, M, Palamara, O, Patera, V, Patrizii, L, Pazzi, R, Peck, Cw, Perrone, L, Petrera, S, Pistilli, P, Popa, V, Raino, A, Reynoldson, J, Ronga, F, Satriano, C, Satta, L, Scapparone, E, Scholberg, K, Sciubba, A, Serra, P, Sioli, M, Sirri, G, Sitta, M, Spinelli, P, Spinetti, M, Spurio, M, Steinberg, R, Stone, Jl, Sulak, Lr, Surdo, A, Tarle, G, Togo, V, Vakili, M, Vilela, E, Walter, Cw, and Webb, R.

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Muon, Detector, Particles & Fields, Flux, FOS: Physical sciences, MACRO, Gran Sasso, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Nuclear, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Event (particle physics), Charged current, Mixing (physics)
Abstract

We present the measurement of two event samples induced by atmospheric $\nu_\mu$ of average energy $ \bar {E}_\nu \sim 4 GeV$. In the first sample, the neutrino interacts inside the MACRO detector producing an upward-going muon leaving the apparatus. The ratio of the number of observed to expected events is $ 0.57 \pm0.05_{stat} \pm0.06_{syst} \pm0.14_{theor}$ with an angular distribution similar to that expected from the Bartol atmospheric neutrino flux. The second is a mixed sample of internally produced downward-going muons and externally produced upward-going muons stopping inside the detector. These two subsamples are selected by topological criteria; the lack of timing information makes it impossible to distinguish stopping from downgoing muons. The ratio of the number of observed to expected events is $0.71 \pm 0.05_{stat} \pm0.07_{syst} \pm0.18_{theor}$ . Using the ratio of the two subsamples (for which most theoretical uncertainties cancel) we can test the pathlength dependence of the oscillation hypothesis. The probability of agreement with the no-oscillation hypothesis is 5% . The deviations of our observations from the expectations has a preferred interpretation in terms of $\nu_\mu$ oscillations with maximal mixing and $\Delta m^2 \sim 10^{-3} \div 10^{-2} eV^2$. These parameters are in agreement with our results from upward throughgoing muons, induced by $\nu_\mu$ of much higher energies., Comment: 7 pages, 6 figures. Submitted to Phys. Lett. B

Published
2000
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27. New constraint on the existence of the μ+ → e+ γ decay.

Author

Adam J, Bai X, Baldini AM, Baracchini E, Bemporad C, Boca G, Cattaneo PW, Cavoto G, Cei F, Cerri C, de Bari A, De Gerone M, Doke T, Dussoni S, Egger J, Fujii Y, Galli L, Gatti F, Golden B, Grassi M, Graziosi A, Grigoriev DN, Haruyama T, Hildebrandt M, Hisamatsu Y, Ignatov F, Iwamoto T, Kaneko D, Kettle PR, Khazin BI, Khomotov N, Kiselev O, Korenchenko A, Kravchuk N, Lim G, Maki A, Mihara S, Molzon W, Mori T, Mzavia D, Nardò R, Natori H, Nicolò D, Nishiguchi H, Nishimura Y, Ootani W, Panareo M, Papa A, Piredda G, Popov A, Renga F, Ripiccini E, Ritt S, Rossella M, Sawada R, Sergiampietri F, Signorelli G, Suzuki S, Tenchini F, Topchyan C, Uchiyama Y, Voena C, Xiao F, Yamada S, Yamamoto A, Yamashita S, You Z, Yudin YV, and Zanello D

Abstract

The analysis of a combined data set, totaling 3.6 × 10(14) stopped muons on target, in the search for the lepton flavor violating decay μ(+) → e(+)γ is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 × 10(-13) (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.

Published
2013
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28. New limit on the lepton-flavor-violating decay μ+→e+γ.

Author

Adam J, Bai X, Baldini AM, Baracchini E, Bemporad C, Boca G, Cattaneo PW, Cavoto G, Cei F, Cerri C, de Bari A, De Gerone M, Doke T, Dussoni S, Egger J, Fratini K, Fujii Y, Galli L, Gallucci G, Gatti F, Golden B, Grassi M, Grigoriev DN, Haruyama T, Hildebrandt M, Hisamatsu Y, Ignatov F, Iwamoto T, Kettle PR, Khazin BI, Kiselev O, Korenchenko A, Kravchuk N, Maki A, Mihara S, Molzon W, Mori T, Mzavia D, Natori H, Nicolò D, Nishiguchi H, Nishimura Y, Ootani W, Panareo M, Papa A, Pazzi R, Piredda G, Popov A, Renga F, Ritt S, Rossella M, Sawada R, Sergiampietri F, Signorelli G, Suzuki S, Tenchini F, Topchyan C, Uchiyama Y, Valle R, Voena C, Xiao F, Yamada S, Yamamoto A, Yamashita S, Yudin YV, and Zanello D

Abstract

We present a new result based on an analysis of the data collected by the MEG detector at the Paul Scherrer Institut in 2009 and 2010, in search of the lepton-flavor-violating decay μ(+)e(+)γ. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8×10(14) muon decays, gives a 90% C.L. upper limit of 2.4×10(-12) on the branching ratio of the μ(+)→e(+)γ decay, constituting the most stringent limit on the existence of this decay to date., (© 2011 American Physical Society)

Published
2011
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