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1. Development and implementation of holmium sources produced by molecular plating for the HOLMES experiment

Author: Cerboni, N, de Bodin-de Galembert, G, De Gerone, M, Gallucci, G, Müller, E, Nucciotti, A, Steinegger, P, Maugeri, E, Cerboni N., de Bodin-de Galembert G., De Gerone M., Gallucci G., Müller E., Nucciotti A., Steinegger P., Maugeri E. A., Cerboni, N, de Bodin-de Galembert, G, De Gerone, M, Gallucci, G, Müller, E, Nucciotti, A, Steinegger, P, Maugeri, E, Cerboni N., de Bodin-de Galembert G., De Gerone M., Gallucci G., Müller E., Nucciotti A., Steinegger P., and Maugeri E. A.
Abstract: This manuscript reports on the optimization of a molecular plating procedure for the production of uniform and homogeneous films of holmium deposited onto gold-plated copper substrate. In particular, the effects caused by molecular plating solvents with different vapour pressure on the morphology and stability of the resulting films were investigated, allowing the selection of the optimum solvent. The developed procedure will allow allow the production of sources of holmium ions for the envisaged HOLMES experiment aiming at the direct measurement of the neutrino mass.
Published: 2024

2. An updated overview of the HOLMES status

Author: Borghesi, M, Alpert, B, Balata, M, Becker, D, Bennet, D, Celasco, E, Cerboni, N, De Gerone, M, Dressler, R, Faverzani, M, Fedkevych, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hilton, G, Koster, U, Labranca, D, Lusignoli, M, Mates, J, Maugeri, E, Nisi, S, Nucciotti, A, Origo, L, Pessina, G, Ragazzi, S, Reintsema, C, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, Borghesi M., Alpert B., Balata M., Becker D., Bennet D., Celasco E., Cerboni N., De Gerone M., Dressler R., Faverzani M., Fedkevych M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Giachero A., Hilton G., Koster U., Labranca D., Lusignoli M., Mates J., Maugeri E., Nisi S., Nucciotti A., Origo L., Pessina G., Ragazzi S., Reintsema C., Schmidt D., Schumann D., Swetz D., Ullom J., Vale L., Borghesi, M, Alpert, B, Balata, M, Becker, D, Bennet, D, Celasco, E, Cerboni, N, De Gerone, M, Dressler, R, Faverzani, M, Fedkevych, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hilton, G, Koster, U, Labranca, D, Lusignoli, M, Mates, J, Maugeri, E, Nisi, S, Nucciotti, A, Origo, L, Pessina, G, Ragazzi, S, Reintsema, C, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, Borghesi M., Alpert B., Balata M., Becker D., Bennet D., Celasco E., Cerboni N., De Gerone M., Dressler R., Faverzani M., Fedkevych M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Giachero A., Hilton G., Koster U., Labranca D., Lusignoli M., Mates J., Maugeri E., Nisi S., Nucciotti A., Origo L., Pessina G., Ragazzi S., Reintsema C., Schmidt D., Schumann D., Swetz D., Ullom J., and Vale L.
Abstract: HOLMES is an ERC project started in 2014 that will perform a model independent measurement of the neutrino mass with a sensitivity of the order of 1 eV. In order to reach its goal sensitivity, HOLMES will use 1000 low temperature microcalorimeters, each implanted with an activity of 300 Bq of 163Ho, performing thus a calorimetric measurement. This contribution presents the recent results achieved that lay the grounds for the low-activity phase of the HOLMES experiment, that will lead to its first limit on the neutrino mass.
Published: 2023

3. Status of the HOLMES experiment: commissioning of the ion implanter

Author: Gallucci, G, Bevilacqua, A, Biasotti, M, Borghesi, M, Cerboni, N, Ceruti, G, De Bodin De Galembert, G, De Gerone, M, Faverzani, M, Fedkevych, M, Ferri, E, Gatti, F, Giachero, A, Maugeri, E, Manfrinetti, P, Nucciotti, A, Parodi, L, Pessina, G, Schumann, D, Siccardi, F, Gallucci G., Bevilacqua A., Biasotti M., Borghesi M., Cerboni N., Ceruti G., De Bodin De Galembert G., De Gerone M., Faverzani M., Fedkevych M., Ferri E., Gatti F., Giachero A., Maugeri E., Manfrinetti P., Nucciotti A., Parodi L., Pessina G., Schumann D., Siccardi F., Gallucci, G, Bevilacqua, A, Biasotti, M, Borghesi, M, Cerboni, N, Ceruti, G, De Bodin De Galembert, G, De Gerone, M, Faverzani, M, Fedkevych, M, Ferri, E, Gatti, F, Giachero, A, Maugeri, E, Manfrinetti, P, Nucciotti, A, Parodi, L, Pessina, G, Schumann, D, Siccardi, F, Gallucci G., Bevilacqua A., Biasotti M., Borghesi M., Cerboni N., Ceruti G., De Bodin De Galembert G., De Gerone M., Faverzani M., Fedkevych M., Ferri E., Gatti F., Giachero A., Maugeri E., Manfrinetti P., Nucciotti A., Parodi L., Pessina G., Schumann D., and Siccardi F.
Abstract: The neutrino mass determination is an open issue in particle physics. The study of the endpoint of beta decay is the best experimental way to provide a model-independent measurement. The HOLMES experiment aims to measure directly the neutrino mass with a calorimetric approach studying the 163Ho electron-capture decay. The very low Q-value (2.8 keV), the half-life (4570 y) and the proximity of the endpoint to M1 resonance make the 163Ho decay a very good choice. However, there are two critical steps to be considered for the realization of the experiment. The first step is embedding of the source isotope inside the cryogenic microcalorimeters so that the energy released in the decay process is entirely contained within the detectors, except for the fraction taken away by the neutrino. The second one is the rejection of 166Ho radioactive isotope that could produce false signal in the region of interest. Taking into account these two requirements, a dedicated implanter with a sputter ion source, an acceleration section (up to 50 keV) and a magnetic dipole (for ion selection and beam focusing) has been designed and developed. The implanter calibration and performance have been evaluated using 63Cu/65Cu and 197Au beams. Currently, different holmium compounds are being tested to find the candidate with the best efficiency in the sputter process. This work will show the status of the machine development and commissioning.
Published: 2022

4. Multiplexed Superconducting Detectors for a Neutrino Mass Experiment

Author: Ferri, E, Alpert, B, Balata, M, Becker, D, Bennett, D, Borghesi, M, De Gerone, M, Dressler, R, Faverzani, M, Fedkevych, M, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hilton, G, Koster, U, Lusignoli, M, Mates, J, Maugeri, E, Nisi, S, Nucciotti, A, Pessina, G, Ragazzi, S, Reintsema, C, Ribeiro Gomes, M, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, Ferri E., Alpert B., Balata M., Becker D., Bennett D., Borghesi M., De Gerone M., Dressler R., Faverzani M., Fedkevych M., Fowler J., Gallucci G., Gard J. D., Gatti F., Giachero A., Hilton G. C., Koster U., Lusignoli M., Mates J. A. B., Maugeri E. A., Nisi S., Nucciotti A., Pessina G., Ragazzi S., Reintsema C. D., Ribeiro Gomes M., Schmidt D., Schumann D., Swetz D., Ullom J., Vale L. R., Ferri, E, Alpert, B, Balata, M, Becker, D, Bennett, D, Borghesi, M, De Gerone, M, Dressler, R, Faverzani, M, Fedkevych, M, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hilton, G, Koster, U, Lusignoli, M, Mates, J, Maugeri, E, Nisi, S, Nucciotti, A, Pessina, G, Ragazzi, S, Reintsema, C, Ribeiro Gomes, M, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, Ferri E., Alpert B., Balata M., Becker D., Bennett D., Borghesi M., De Gerone M., Dressler R., Faverzani M., Fedkevych M., Fowler J., Gallucci G., Gard J. D., Gatti F., Giachero A., Hilton G. C., Koster U., Lusignoli M., Mates J. A. B., Maugeri E. A., Nisi S., Nucciotti A., Pessina G., Ragazzi S., Reintsema C. D., Ribeiro Gomes M., Schmidt D., Schumann D., Swetz D., Ullom J., and Vale L. R.
Abstract: One of the major challenges in nowadays particle physics and astrophysics is the determination of the absolute neutrino mass scale. A powerful tool to evaluate the effective neutrino mass is the calorimetric measurement of the energy released in a nuclear decay involving neutrino. In order to reach a sensitivity on the neutrino mass of the order of 1 eV, not only detectors characterized by high performances (i.e. energy and time resolution of eV at keV and 1 s, respectively) are needed but also many detectors working in parallel are required. Microwave frequency readout provide an effective technique to read out large arrays of low temperature detectors allowing to reach a multiplex factor of the order of thousands. This technique is the one used to read out the 1000 Transition Edge Sensors of HOLMES, an experiment that aims at measuring the electron neutrino mass by means of the electron capture (EC) decay of 163Ho with an expected sensitivity of the order of 1 eV. In this contribution we present the characterization of the microwave-multiplexed readout system, and the results obtained with the detectors specifically designed for HOLMES.
Published: 2022

5. Operation and performance of MEG II detector

Author: MEG II Collaboration, Afanaciev, K., Baldini, A. M., Ban, S., Baranov, V., Benmansour, H., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Corvaglia, A., Cuna, F., Maso, G. Dal, De Bari, A., De Gerone, M., Barusso, L. Ferrari, Francesconi, M., Galli, L., Gallucci, G., Gatti, F., Gerritzen, L., Grancagnolo, F., Grandoni, E. G., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Ieki, K., Ignatov, F., Ikeda, F., Iwamoto, T., Karpov, S., Kettle, P. -R., Khomutov, N., Kobayashi, S., Kolesnikov, A., Kravchuk, N., Krylov, V., Kuchinskiy, N., Kyle, W., Libeiro, T., Malyshev, V., Matsushita, A., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Morsani, F., Nakao, M., Nicolò, D., Nishiguchi, H., Ochi, A., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Popov, A., Raffaelli, F., Renga, F., Ritt, S., Rossella, M., Rozhdestvensky, A., Schwendimann, P., Shimada, K., Signorelli, G., Stoykov, A., Takahashi, M., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Venturini, A., Vitali, B., Voena, C., Yamamoto, K., Yanai, K., Yonemoto, T., Yoshida, K., Yudin, Yu. V., MEG II Collaboration, Afanaciev, K., Baldini, A. M., Ban, S., Baranov, V., Benmansour, H., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Corvaglia, A., Cuna, F., Maso, G. Dal, De Bari, A., De Gerone, M., Barusso, L. Ferrari, Francesconi, M., Galli, L., Gallucci, G., Gatti, F., Gerritzen, L., Grancagnolo, F., Grandoni, E. G., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Ieki, K., Ignatov, F., Ikeda, F., Iwamoto, T., Karpov, S., Kettle, P. -R., Khomutov, N., Kobayashi, S., Kolesnikov, A., Kravchuk, N., Krylov, V., Kuchinskiy, N., Kyle, W., Libeiro, T., Malyshev, V., Matsushita, A., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Morsani, F., Nakao, M., Nicolò, D., Nishiguchi, H., Ochi, A., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Popov, A., Raffaelli, F., Renga, F., Ritt, S., Rossella, M., Rozhdestvensky, A., Schwendimann, P., Shimada, K., Signorelli, G., Stoykov, A., Takahashi, M., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Venturini, A., Vitali, B., Voena, C., Yamamoto, K., Yanai, K., Yonemoto, T., Yoshida, K., and Yudin, Yu. V.
Abstract: The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is the successor to the MEG experiment, which completed data taking in 2013. MEG II started fully operational data taking in 2021, with the goal of improving the sensitivity of the mu+ -> e+ gamma decay down to 6e-14 almost an order of magnitude better than the current limit. In this paper, we describe the operation and performance of the experiment and give a new estimate of its sensitivity versus data acquisition time., Comment: 42 pages, 55 figures. Submitted to EPJC
Published: 2023

6. A search for $\mu^+\to e^+\gamma$ with the first dataset of the MEG II experiment

Author: MEG II collaboration, Afanaciev, K., Baldini, A. M., Ban, S., Baranov, V., Benmansour, H., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Corvaglia, A., Cuna, F., Maso, G. Dal, De Bari, A., De Gerone, M., Barusso, L. Ferrari, Francesconi, M., Galli, L., Gallucci, G., Gatti, F., Gerritzen, L., Grancagnolo, F., Grandoni, E. G., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Ieki, K., Ignatov, F., Ikeda, F., Iwamoto, T., Karpov, S., Kettle, P. -R., Khomutov, N., Kobayashi, S., Kolesnikov, A., Kravchuk, N., Krylov, V., Kuchinskiy, N., Kyle, W., Libeiro, T., Malyshev, V., Matsushita, A., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Nakao, M., Nicolò, D., Nishiguchi, H., Ochi, A., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Popov, A., Renga, F., Ritt, S., Rossella, M., Rozhdestvensky, A., Schwendimann, P., Shimada, K., Signorelli, G., Takahashi, M., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Venturini, A., Vitali, B., Voena, C., Yamamoto, K., Yanai, K., Yonemoto, T., Yoshida, K., Yudin, Yu. V., MEG II collaboration, Afanaciev, K., Baldini, A. M., Ban, S., Baranov, V., Benmansour, H., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Corvaglia, A., Cuna, F., Maso, G. Dal, De Bari, A., De Gerone, M., Barusso, L. Ferrari, Francesconi, M., Galli, L., Gallucci, G., Gatti, F., Gerritzen, L., Grancagnolo, F., Grandoni, E. G., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Ieki, K., Ignatov, F., Ikeda, F., Iwamoto, T., Karpov, S., Kettle, P. -R., Khomutov, N., Kobayashi, S., Kolesnikov, A., Kravchuk, N., Krylov, V., Kuchinskiy, N., Kyle, W., Libeiro, T., Malyshev, V., Matsushita, A., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Nakao, M., Nicolò, D., Nishiguchi, H., Ochi, A., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Popov, A., Renga, F., Ritt, S., Rossella, M., Rozhdestvensky, A., Schwendimann, P., Shimada, K., Signorelli, G., Takahashi, M., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Venturini, A., Vitali, B., Voena, C., Yamamoto, K., Yanai, K., Yonemoto, T., Yoshida, K., and Yudin, Yu. V.
Abstract: The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports the result of a search for the decay $\mu^+\to e^+\gamma$ 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 B($\mu^+\to e^+\gamma$) < $7.5 \times 10^{-13}$ (90% C.L.). The combination of this result and the limit obtained by MEG gives B($\mu^+\to e^+\gamma$) < $3.1 \times 10^{-13}$ (90% C.L.), 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., Comment: 10 pages, 6 figures. To be published in EPJC
Published: 2023

7. A novel approach for nearly-coincident events rejection

Author: Borghesi, M, De Gerone, M, Faverzani, M, Fedkevych, M, Ferri, E, Gallucci, G, Giachero, A, Nucciotti, A, Puiu, A, Borghesi, M., De Gerone, M., Faverzani, M., Fedkevych, M., Ferri, E., Gallucci, G., Giachero, A., Nucciotti, A., Puiu, A., Borghesi, M, De Gerone, M, Faverzani, M, Fedkevych, M, Ferri, E, Gallucci, G, Giachero, A, Nucciotti, A, Puiu, A, Borghesi, M., De Gerone, M., Faverzani, M., Fedkevych, M., Ferri, E., Gallucci, G., Giachero, A., Nucciotti, A., and Puiu, A.
Abstract: We present a novel technique, called DSVP (Discrimination through Singular Vectors Projections), to discriminate spurious events within a dataset. The purpose of this paper is to lay down a general procedure which can be tailored for a broad variety of applications. After describing the general concept, we apply the algorithm to the problem of identifying nearly coincident events in low temperature microcalorimeters in order to push the time resolution close to its intrinsic limit. In fact, from simulated datasets it was possible to achieve an effective time resolution even shorter than the sampling time of the system considered. The obtained results are contextualized in the framework of the HOLMES experiment, which aims at directly measuring the neutrino mass with the calorimetric approach, allowing to significally improve its statistical sensitivity.
Published: 2021

8. Progress in the development of TES microcalorimeter detectors suitable for neutrino mass measurement

Author: Giachero, A, Alpert, B, Becker, D, Bennett, D, Borghesi, M, De Gerone, M, Faverzani, M, Fedkevych, M, Ferri, E, Gallucci, G, Gard, J, Gatti, F, Hilton, G, Mates, J, Nucciotti, A, Pessina, G, Puiu, A, Reintsema, C, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Giachero A., Alpert B., Becker D., Bennett D., Borghesi M., De Gerone M., Faverzani M., Fedkevych M., Ferri E., Gallucci G., Gard J. D., Gatti F., Hilton G. C., Mates J. A. B., Nucciotti A., Pessina G., Puiu A., Reintsema C. D., Schmidt D., Swetz D., Ullom J., Vale L. R., Giachero, A, Alpert, B, Becker, D, Bennett, D, Borghesi, M, De Gerone, M, Faverzani, M, Fedkevych, M, Ferri, E, Gallucci, G, Gard, J, Gatti, F, Hilton, G, Mates, J, Nucciotti, A, Pessina, G, Puiu, A, Reintsema, C, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Giachero A., Alpert B., Becker D., Bennett D., Borghesi M., De Gerone M., Faverzani M., Fedkevych M., Ferri E., Gallucci G., Gard J. D., Gatti F., Hilton G. C., Mates J. A. B., Nucciotti A., Pessina G., Puiu A., Reintsema C. D., Schmidt D., Swetz D., Ullom J., and Vale L. R.
Abstract: The HOLMES experiment will perform a precise calorimetric measurement of the end point of the Electron Capture (EC) decay spectrum of 163Ho in order to extract information on neutrino mass with a sensitivity below 2 eV. In its final configuration, HOLMES will deploy 1000 detectors of low temperature microcalorimeters with implanted 163Ho nuclei. The baseline sensors for HOLMES are Mo/Cu TESs (Transition Edge Sensors) on SiNx membrane with gold absorbers. Considering the large number of pixels and an event rate of about 300 Hz/pixel, a large multiplexing factor and a large bandwidth are needed. To fulfill this requirement, HOLMES will exploit recent advances on microwave multiplexing. In this contribution we present the status of the activities in development, the performances of the developed microwave-multiplexed readout system, and the results obtained with the detectors specifically designed for HOLMES in terms of noise, time and energy resolutions
Published: 2021

9. Transition-Edge Sensors for HOLMES

Author: Puiu, A, Becker, D, Bennett, D, Biasotti, M, Borghesi, M, De Gerone, M, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Hilton, G, Giachero, A, Mates, J, Nucciotti, A, Pessina, G, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Puiu A., Becker D., Bennett D., Biasotti M., Borghesi M., De Gerone M., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Hilton G., Giachero A., Mates J., Nucciotti A., Pessina G., Schmidt D., Swetz D., Ullom J., Vale L., Puiu, A, Becker, D, Bennett, D, Biasotti, M, Borghesi, M, De Gerone, M, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Hilton, G, Giachero, A, Mates, J, Nucciotti, A, Pessina, G, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Puiu A., Becker D., Bennett D., Biasotti M., Borghesi M., De Gerone M., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Hilton G., Giachero A., Mates J., Nucciotti A., Pessina G., Schmidt D., Swetz D., Ullom J., and Vale L.
Abstract: HOLMES is an experiment aiming at performing a direct measurement of the neutrino mass from the electron capture (EC) spectrum of 163Ho. In order to reach a sensitivity of the order of ∼ 1 eV/c2 on the neutrino mass, it is necessary to gather as many as 10 13 events in the 3-year projected live time of HOLMES, keeping the pileup fraction as low as 10 - 4. This is not a trivial matter when it comes to low- temperature calorimeters, which usually have a rather slow time response. At the same time, a large number of detectors need to be operated simultaneously, and hence, in order to avoid an extremely large cryogenic facility, multiplexing is required. In this contribution, I will outline the current status and perspective of HOLMES, with special care devoted to the detectors and readout system, which have currently reached their target performance
Published: 2020

10. Status of the HOLMES Experiment

Author: Faverzani, M, Alpert, B, Balata, M, Backer, D, Bennet, D, Bevilaqua, A, Biasotti, M, Borghesi, M, Ceruti, G, De Gerone, M, Dressler, R, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Mates, J, Maugeri, E, Nisi, S, Nucciotti, A, Parodi, L, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro-Gomez, M, Schmidt, D, Schumann, D, Siccardi, F, Swetz, D, Ullom, J, Vale, L, Faverzani, M., Alpert, B., Balata, M., Backer, D., Bennet, D., Bevilaqua, A., Biasotti, M., Borghesi, M., Ceruti, G., De Gerone, M., Dressler, R., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Gatti, F., Giachero, A., Heinitz, S., Hilton, G., Köster, U., Lusignoli, M., Mates, J., Maugeri, E., Nisi, S., Nucciotti, A., Parodi, L., Pessina, G., Puiu, A., Ragazzi, S., Reintsema, C., Ribeiro-Gomez, M., Schmidt, D., Schumann, D., Siccardi, F., Swetz, D., Ullom, J., Vale, L., Faverzani, M, Alpert, B, Balata, M, Backer, D, Bennet, D, Bevilaqua, A, Biasotti, M, Borghesi, M, Ceruti, G, De Gerone, M, Dressler, R, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Mates, J, Maugeri, E, Nisi, S, Nucciotti, A, Parodi, L, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro-Gomez, M, Schmidt, D, Schumann, D, Siccardi, F, Swetz, D, Ullom, J, Vale, L, Faverzani, M., Alpert, B., Balata, M., Backer, D., Bennet, D., Bevilaqua, A., Biasotti, M., Borghesi, M., Ceruti, G., De Gerone, M., Dressler, R., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Gatti, F., Giachero, A., Heinitz, S., Hilton, G., Köster, U., Lusignoli, M., Mates, J., Maugeri, E., Nisi, S., Nucciotti, A., Parodi, L., Pessina, G., Puiu, A., Ragazzi, S., Reintsema, C., Ribeiro-Gomez, M., Schmidt, D., Schumann, D., Siccardi, F., Swetz, D., Ullom, J., and Vale, L.
Abstract: The absolute neutrino mass is still an unknown parameter in the modern landscape of particle physics. The HOLMES experiment aims at exploiting the calorimetric approach to directly measure the neutrino mass through the kinematic measurement of the decay products of the weak process decay of 163Ho. This low energy decaying isotope, in fact, undergoes electron capture emitting a neutrino and leaving the daughter atom, 163Dy∗, in an atomic excited state. This, in turn, relaxes by emitting electrons and, to a considerably lesser extent, photons. The high-energy portion of the calorimetric spectrum of this decay is affected by the non-vanishing neutrino mass value. Given the small fraction of events falling within the region of interest, to achieve a high experimental sensitivity on the neutrino mass, it is important to have a high activity combined with a very small undetected pileup contribution. To achieve these targets, the final configuration of HOLMES foresees the deployment of a large number of 163Ho ion-implanted TESs characterized by an ambitiously high activity of 300 Hz each. In this paper, we outline the status of the major tasks that will bring HOLMES to achieve a statistical sensitivity on the neutrino mass as low as 2 eV/c2.
Published: 2020

11. Probing the absolute neutrino mass scale with 163Ho: The HOLMES project

Author: De Gerone, M, Alpert, B, Becker, D, Bennett, D, Biasotti, M, Ceriale, V, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hays-Wehle, J, Heinitz, S, Hilton, G, Koester, U, Lusignoli, M, Mates, J, Nucciotti, A, Nisi, S, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro Gomes, M, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, De Gerone M., Alpert B., Becker D., Bennett D., Biasotti M., Ceriale V., Dressler R., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Giachero A., Hays-Wehle J., Heinitz S., Hilton G., Koester U., Lusignoli M., Mates J., Nucciotti A., Nisi S., Orlando A., Pessina G., Puiu A., Ragazzi S., Reintsema C., Ribeiro Gomes M., Schmidt D., Schumann D., Swetz D., Ullom J., Vale L., De Gerone, M, Alpert, B, Becker, D, Bennett, D, Biasotti, M, Ceriale, V, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hays-Wehle, J, Heinitz, S, Hilton, G, Koester, U, Lusignoli, M, Mates, J, Nucciotti, A, Nisi, S, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro Gomes, M, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, De Gerone M., Alpert B., Becker D., Bennett D., Biasotti M., Ceriale V., Dressler R., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Giachero A., Hays-Wehle J., Heinitz S., Hilton G., Koester U., Lusignoli M., Mates J., Nucciotti A., Nisi S., Orlando A., Pessina G., Puiu A., Ragazzi S., Reintsema C., Ribeiro Gomes M., Schmidt D., Schumann D., Swetz D., Ullom J., and Vale L.
Abstract: The HOLMES project aims to directly measure the nu mass down to the eV scale using the electron capture decay (EC) of Ho-163. It will perform a precise calorimetric measurement of the end-point of the Ho energy spectrum looking for the deformation caused by a finite nu mass. The choice of Ho-163 as source is driven by the very low Q-value of the EC reaction, which allows for high sensitivity with low activities (O(10(2))Bq/detector), thus reducing the pile-up probability. A large array made by thousands of transition edge sensors based micro-calorimeters will be used. The calorimetric approach eliminates systematic uncertainties arising from the use of an external beta source, and minimizes the effect of the atomic de-excitation process. The commissioning of the first implanted sub-array is scheduled for the end of 2018. It will provide useful data about the EC decay of Ho-163 together with a first limit on nu mass.
Published: 2019

12. 163 Ho Distillation and Implantation for HOLMES Experiment

Author: Gallucci, G, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Gatti, F, Giachero, A, Manfrinetti, P, Nucciotti, A, Orlando, A, Provino, A, Puiu, A, Gallucci, G., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Ferri, E., Gatti, F., Giachero, A., Manfrinetti, P., Nucciotti, A., Orlando, A., Provino, A., Puiu, A., Gallucci, G, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Gatti, F, Giachero, A, Manfrinetti, P, Nucciotti, A, Orlando, A, Provino, A, Puiu, A, Gallucci, G., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Ferri, E., Gatti, F., Giachero, A., Manfrinetti, P., Nucciotti, A., Orlando, A., Provino, A., and Puiu, A.
Abstract: HOLMES is an experiment to directly measure the neutrino mass with a calorimetric approach. The calorimetric technique eliminates several systematic uncertainties usually present in spectrometers where the external source and decays to excited states affect the measurement. 163 Ho is chosen as source for its very low Q value (2.8 keV), the proximity of the end-point to resonance M1 and its half life (4570 year). These features are optimal to reach simultaneously a reasonable activity to have sufficient statistics in the end-point and a small quantity of 163 Ho embedded in the detector not to alter significantly its heat capacity. 163 Ho will be produced via neutron irradiation of enriched 162 Er 2 O 3 at the Institute Laue–Langevin (Grenoble, France), and chemically separated at Paul Scherrer Institut (Villigen, Switzerland). It will arrive at INFN laboratory of Genova in oxide form (Ho 2 O 3 ) with traces of others Ho isotopes and contaminants not removable using chemical methods. In particular, the metastable 166 m Ho undergoes beta decay with a half life of about 1200 year, if present 166 m Ho induces background below 5 keV. The removal of these contaminants is critical for HOLMES so a dedicated system is being set up. The system is designed to achieve an optimal mass separation for 163 Ho and consists of two main components: an evaporation chamber and an ion implanter. In the evaporation chamber, holmium will be reduced in metallic form, using the reaction 2Y+Ho 2 O 3 → Y 2 O 3 +2Ho and used to produce a metallic target for the ion implanter source. The ion implanter consists of five main components: a Penning sputter ion source, an acceleration section, a magnetic/electrostatic mass analyser, a magnetic scanning stage and a focusing electrostatic triplet. In this contribution, we describe the procedures, under continuous refinement, for the holmium evaporation process, the ion-implanted metallic target production and the status of the ion implanter.
Published: 2019

13. HOLMES, an experiment for a direct measurement of neutrino mass

Author: Puiu, A, Becker, D, Bennett, D, Biasotti, M, Borghesi, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Hays-Wehle, J, Hilton, G, Giachero, A, Mates, J, Nucciotti, A, Orlando, A, Pessina, G, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Puiu A., Becker D., Bennett D., Biasotti M., Borghesi M., Ceriale V., De Gerone M., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Hays-Wehle J., Hilton G., Giachero A., Mates J., Nucciotti A., Orlando A., Pessina G., Schmidt D., Swetz D., Ullom J., Vale L., Puiu, A, Becker, D, Bennett, D, Biasotti, M, Borghesi, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Hays-Wehle, J, Hilton, G, Giachero, A, Mates, J, Nucciotti, A, Orlando, A, Pessina, G, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Puiu A., Becker D., Bennett D., Biasotti M., Borghesi M., Ceriale V., De Gerone M., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Hays-Wehle J., Hilton G., Giachero A., Mates J., Nucciotti A., Orlando A., Pessina G., Schmidt D., Swetz D., Ullom J., and Vale L.
Abstract: The neutrino mass is a fundamental parameter of the Standard Model and the measurement of its value is one of the most compelling issues in particle physics. HOLMES is an experiment set up at the University of Milano-Bicocca aiming at performing a direct measurement of the neutrino mass from the Electron Capture (EC) decay of Ho-163. HOLMES will use low-temperature calorimeters, avoiding the typical systematics of spectrometers arising from the use of any external source, in order to precisely measure the energy of the electrons emitted in the EC decay. In this contribution we outline the steps which will lead to the HOLMES measurement of the neutrino mass.
Published: 2019

14. Production and separation of163Ho for nuclear physics experiments

Author: Heinitz, S, Kivel, N, Schumann, D, Köster, U, Balata, M, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Gallucci, G, Gatti, F, Giachero, A, Nisi, S, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Heinitz, S., Kivel, N., Schumann, D., Köster, U., Balata, M., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Ferri, E., Gallucci, G., Gatti, F., Giachero, A., Nisi, S., Nucciotti, A., Orlando, A., Pessina, G., Puiu, A., Ragazzi, S., Heinitz, S, Kivel, N, Schumann, D, Köster, U, Balata, M, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Gallucci, G, Gatti, F, Giachero, A, Nisi, S, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Heinitz, S., Kivel, N., Schumann, D., Köster, U., Balata, M., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Ferri, E., Gallucci, G., Gatti, F., Giachero, A., Nisi, S., Nucciotti, A., Orlando, A., Pessina, G., Puiu, A., and Ragazzi, S.
Abstract: This paper describes the production and chemical separation of the163Ho isotope that will be used in several nuclear physics experiments aiming at measuring the neutrino mass as well as the neutron cross section of the163Ho isotope. For this purpose, several batches of enriched162Er have been irradiated at the Institut Laue-Langevin high flux reactor to finally produce 6 mg or 100 MBq of the desired163Ho isotope. A portion of the Er/Ho mixture is then subjected to a sophisticated chemical separation involving ion exchange chromatography to isolate the Ho product from the Er target material. Before irradiation, a thorough analysis of the impurity content was performed and its implication on the produced nuclide inventory will be discussed.
Published: 2018

15. The HOLMES experiment: Status and perspective

Author: Alpert, B, Balata, M, Becker, D, Bennett, D, Biasotti, M, Ceriale, V, de Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hays-Wehle, J, Heinitz, S, Hilton, G, Koster, U, Lusignoli, M, Mates, J, Nisi, S, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro-Gomes, M, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, Alpert B., Balata M., Becker D., Bennett D., Biasotti M., Ceriale V., de Gerone M., Dressler R., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Giachero A., Hays-Wehle J., Heinitz S., Hilton G., Koster U., Lusignoli M., Mates J., Nisi S., Nucciotti A., Orlando A., Pessina G., Puiu A., Ragazzi S., Reintsema C., Ribeiro-Gomes M., Schmidt D., Schumann D., Swetz D., Ullom J., Vale L., Alpert, B, Balata, M, Becker, D, Bennett, D, Biasotti, M, Ceriale, V, de Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hays-Wehle, J, Heinitz, S, Hilton, G, Koster, U, Lusignoli, M, Mates, J, Nisi, S, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro-Gomes, M, Schmidt, D, Schumann, D, Swetz, D, Ullom, J, Vale, L, Alpert B., Balata M., Becker D., Bennett D., Biasotti M., Ceriale V., de Gerone M., Dressler R., Faverzani M., Ferri E., Fowler J., Gallucci G., Gard J., Gatti F., Giachero A., Hays-Wehle J., Heinitz S., Hilton G., Koster U., Lusignoli M., Mates J., Nisi S., Nucciotti A., Orlando A., Pessina G., Puiu A., Ragazzi S., Reintsema C., Ribeiro-Gomes M., Schmidt D., Schumann D., Swetz D., Ullom J., and Vale L.
Abstract: One of the most crucial challenges in today particle physics and cosmology is the determination of the neutrino absolute mass scale. Currently, the only model independent method to set a limit neutrino mass is the study of the nuclear beta spectrum end-point. Performing a calorimetric measurement of the end point of the Electron Capture decay spectrum of 163Ho, the HOLMES experiment aims at pushing down the sensitivity on the smallest neutrino mass at the order of ∼ eV. In its final configuration HOLMES will deploy an array of 1000 microcalorimeters based on Transition Edge Sensors with gold absorbers in which the 163Ho will be ion implanted with a target activity of 300 Hz/det. In order to achieve a statistical sensitivity on the neutrino mass in the eV range, there are stringent requirements on the detector performances: fast time resolution (∼ 1 µs) to solve pile-up events and an energy resolution of few eV at the Q-value (2.8 keV). Furthermore, the detectors must be multiplexable. The best technique to easily readout such a number of detector with a common readout line is the microwave frequency domain readout. We outline the HOLMES project with its physics reach and technical challenges together with its status and perspectives. In detail, we report the status of HOLMES activities concerning the 163Ho isotope production, the TES and multiplexed array read-out and the isotope embedding process.
Published: 2018

16. Production and separation of163Ho for nuclear physics experiments

Author: Heinitz, S, Kivel, N, Schumann, D, Köster, U, Balata, M, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Gallucci, G, Gatti, F, Giachero, A, Nisi, S, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Heinitz, S., Kivel, N., Schumann, D., Köster, U., Balata, M., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Ferri, E., Gallucci, G., Gatti, F., Giachero, A., Nisi, S., Nucciotti, A., Orlando, A., Pessina, G., Puiu, A., Ragazzi, S., Heinitz, S, Kivel, N, Schumann, D, Köster, U, Balata, M, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Ferri, E, Gallucci, G, Gatti, F, Giachero, A, Nisi, S, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Ragazzi, S, Heinitz, S., Kivel, N., Schumann, D., Köster, U., Balata, M., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Ferri, E., Gallucci, G., Gatti, F., Giachero, A., Nisi, S., Nucciotti, A., Orlando, A., Pessina, G., Puiu, A., and Ragazzi, S.
Abstract: This paper describes the production and chemical separation of the163Ho isotope that will be used in several nuclear physics experiments aiming at measuring the neutrino mass as well as the neutron cross section of the163Ho isotope. For this purpose, several batches of enriched162Er have been irradiated at the Institut Laue-Langevin high flux reactor to finally produce 6 mg or 100 MBq of the desired163Ho isotope. A portion of the Er/Ho mixture is then subjected to a sophisticated chemical separation involving ion exchange chromatography to isolate the Ho product from the Er target material. Before irradiation, a thorough analysis of the impurity content was performed and its implication on the produced nuclide inventory will be discussed.
Published: 2018

17. Microfabrication of Transition-Edge Sensor Arrays of Microcalorimeters with 163Ho for Direct Neutrino Mass Measurements with HOLMES

Author: Orlando, A, Ceriale, V, Ceruti, G, De Gerone, M, Faverzani, M, Ferri, E, Gallucci, G, Giachero, A, Nucciotti, A, Puiu, A, Schmidt, D, Swetz, D, Ullom, J, Orlando A., Ceriale V., Ceruti G., De Gerone M., Faverzani M., Ferri E., Gallucci G., Giachero A., Nucciotti A., Puiu A., Schmidt D., Swetz D., Ullom J., Orlando, A, Ceriale, V, Ceruti, G, De Gerone, M, Faverzani, M, Ferri, E, Gallucci, G, Giachero, A, Nucciotti, A, Puiu, A, Schmidt, D, Swetz, D, Ullom, J, Orlando A., Ceriale V., Ceruti G., De Gerone M., Faverzani M., Ferri E., Gallucci G., Giachero A., Nucciotti A., Puiu A., Schmidt D., Swetz D., and Ullom J.
Abstract: HOLMES is aiming at a direct measurement of neutrino mass by performing a calorimetric measurement of the energy released in the decay of 163Ho. In such approach, the 163Ho source, with the required activity, needs to be embedded in the detector. HOLMES will deploy a large array of transition-edge sensor microcalorimeters with implanted 163Ho ions. While good progress has been made in optimizing single pixel design and fabrication to achieve the target resolution, a major challenge is the fabrication of arrays of such microcalorimeters with the required amount of 163Ho ions embedded in the detectors absorber. We describe the multi-step microfabrication process implemented to produce the detector arrays for HOLMES. One crucial part of such process is the ability to perform co-deposition of gold during the 163Ho implantation process on the detectors absorber. We describe the UHV target chamber, with integrated gold deposition system, we have built to achieve this goal.
Published: 2018

18. Updates on the Transition-Edge Sensors and Multiplexed Readout for HOLMES

Author: Puiu, A, Becker, D, Bennett, D, Biasotti, M, Borghesi, M, Ceriale, V, de Gerone, M, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Hays-Wehle, J, Hilton, G, Giachero, A, Mates, J, Nucciotti, A, Orlando, A, Pessina, G, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Puiu, A., Becker, D., Bennett, D., Biasotti, M., BORGHESI, MATTEO, Ceriale, V., de Gerone, M., Faverzani, M., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Hays-Wehle, J., Hilton, G., Giachero, A., Mates, J., Nucciotti, A., Orlando, A., Pessina, G., Schmidt, D., Swetz, D., Ullom, J., Vale, L., Puiu, A, Becker, D, Bennett, D, Biasotti, M, Borghesi, M, Ceriale, V, de Gerone, M, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Hays-Wehle, J, Hilton, G, Giachero, A, Mates, J, Nucciotti, A, Orlando, A, Pessina, G, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Puiu, A., Becker, D., Bennett, D., Biasotti, M., BORGHESI, MATTEO, Ceriale, V., de Gerone, M., Faverzani, M., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Hays-Wehle, J., Hilton, G., Giachero, A., Mates, J., Nucciotti, A., Orlando, A., Pessina, G., Schmidt, D., Swetz, D., Ullom, J., and Vale, L.
Abstract: Measuring the neutrino mass is one of the most compelling issues in particle physics. HOLMES is an experiment for a direct measurement of the neutrino mass. HOLMES will perform a precise measurement of the end point of the electron capture decay spectrum of (Formula presented.) in order to extract information on the neutrino mass with a sensitivity as low as 1 eV. HOLMES, in its final configuration, will deploy a 1000-pixel array of low-temperature microcalorimeters: each calorimeter is made of an absorber, where the Ho atoms will be implanted, coupled to a transition-edge sensor (TES) thermometer. The detectors will be operated at the working temperature of (Formula presented.) provided by a dilution refrigerator. In order to read out the 1000-detector array of HOLMES, a multiplexing system is necessary: the choice is to couple the transition-edge sensors to a multiplexed rf-SQUID. In this contribution we outline the progress made towards the final configuration of HOLMES regarding both the performances of the TES detectors and the characteristics of the multiplexing system.
Published: 2018

19. Status of the HOLMES Experiment to Directly Measure the Neutrino Mass

Author: Nucciotti, A, Alpert, B, Balata, M, Becker, D, Bennett, D, Bevilacqua, A, Biasotti, M, Ceriale, V, Ceruti, G, Corsini, D, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hays-Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Mates, J, Nisi, S, Orlando, A, Parodi, L, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro-Gomez, M, Schmidt, D, Schuman, D, Siccardi, F, Swetz, D, Ullom, J, Vale, L, Nucciotti, A., Alpert, B., Balata, M., Becker, D., Bennett, D., Bevilacqua, A., Biasotti, M., Ceriale, V., Ceruti, G., Corsini, D., De Gerone, M., Dressler, R., Faverzani, M., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Gatti, F., Giachero, A., Hays-Wehle, J., Heinitz, S., Hilton, G., Köster, U., Lusignoli, M., Mates, J., Nisi, S., Orlando, A., Parodi, L., Pessina, G., Puiu, A., Ragazzi, S., Reintsema, C., Ribeiro-Gomez, M., Schmidt, D., Schuman, D., Siccardi, F., Swetz, D., Ullom, J., Vale, L., Nucciotti, A, Alpert, B, Balata, M, Becker, D, Bennett, D, Bevilacqua, A, Biasotti, M, Ceriale, V, Ceruti, G, Corsini, D, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gallucci, G, Gard, J, Gatti, F, Giachero, A, Hays-Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Mates, J, Nisi, S, Orlando, A, Parodi, L, Pessina, G, Puiu, A, Ragazzi, S, Reintsema, C, Ribeiro-Gomez, M, Schmidt, D, Schuman, D, Siccardi, F, Swetz, D, Ullom, J, Vale, L, Nucciotti, A., Alpert, B., Balata, M., Becker, D., Bennett, D., Bevilacqua, A., Biasotti, M., Ceriale, V., Ceruti, G., Corsini, D., De Gerone, M., Dressler, R., Faverzani, M., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Gatti, F., Giachero, A., Hays-Wehle, J., Heinitz, S., Hilton, G., Köster, U., Lusignoli, M., Mates, J., Nisi, S., Orlando, A., Parodi, L., Pessina, G., Puiu, A., Ragazzi, S., Reintsema, C., Ribeiro-Gomez, M., Schmidt, D., Schuman, D., Siccardi, F., Swetz, D., Ullom, J., and Vale, L.
Abstract: The assessment of neutrino absolute mass scale is still a crucial challenge in today particle physics and cosmology. Beta or electron capture spectrum end-point study is currently the only experimental method which can provide a model-independent measurement of the absolute scale of neutrino mass. HOLMES is an experiment funded by the European Research Council to directly measure the neutrino mass. HOLMES will perform a calorimetric measurement of the energy released in the electron capture decay of the artificial isotope163Ho. In a calorimetric measurement, the energy released in the decay process is entirely contained into the detector, except for the fraction taken away by the neutrino. This approach eliminates both the issues related to the use of an external source and the systematic uncertainties arising from decays on excited final states. The most suitable detectors for this type of measurement are low-temperature thermal detectors, where all the energy released into an absorber is converted into a temperature increase that can be measured by a sensitive thermometer directly coupled with the absorber. This measurement was originally proposed by De Rujula and Lusignoli (Nucl Phys B 219:277, 1983. https://doi.org/10.1016/0550-3213(83)90642-9), but only in the last decade the technological progress in detectors development has allowed to design a sensitive experiment. HOLMES plans to deploy a large array of low-temperature microcalorimeters with implanted163Ho nuclei. In this contribution we outline the HOLMES project with its physics reach and technical challenges, along with its status and perspectives
Published: 2018

20. Characterization of the microwave multiplexing readout and TESs for HOLMES

Author: Ferri, E, Alpert, B, Becker, D, Bennett, D, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Fowler, J, Gallucci, G, Gard, J, Giachero, A, Hays-Wehle, J, Hilton, G, Mates, J, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Reintsema, C, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Ferri, E., Alpert, B. K., Becker, D. T., Bennett, D. A., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Fowler, J. W., Gallucci, G., Gard, J. D., Giachero, A., Hays-Wehle, J. P., Hilton, G. C., Mates, J. A. B., Nucciotti, A., Orlando, A., Pessina, G., Puiu, A., Reintsema, C. D., Schmidt, D. R., Swetz, D. S., Ullom, J. N., Vale, L. R., Ferri, E, Alpert, B, Becker, D, Bennett, D, Biasotti, M, Ceriale, V, De Gerone, M, Faverzani, M, Fowler, J, Gallucci, G, Gard, J, Giachero, A, Hays-Wehle, J, Hilton, G, Mates, J, Nucciotti, A, Orlando, A, Pessina, G, Puiu, A, Reintsema, C, Schmidt, D, Swetz, D, Ullom, J, Vale, L, Ferri, E., Alpert, B. K., Becker, D. T., Bennett, D. A., Biasotti, M., Ceriale, V., De Gerone, M., Faverzani, M., Fowler, J. W., Gallucci, G., Gard, J. D., Giachero, A., Hays-Wehle, J. P., Hilton, G. C., Mates, J. A. B., Nucciotti, A., Orlando, A., Pessina, G., Puiu, A., Reintsema, C. D., Schmidt, D. R., Swetz, D. S., Ullom, J. N., and Vale, L. R.
Abstract: A powerful tool to determine the effective electron-neutrino mass is the calorimetric measurement of the energy released in a nuclear beta decay. Performing a precision measurement of the end point of the Electron Capture decay spectrum of 163Ho, HOLMES aims at pushing down the sensitivity on the neutrino mass below 1 eV. In its final configuration HOLMES will deploy an array of 1000 microcalorimeters based on Transition Edge Sensors with gold absorbers in which the 163Ho will be ion implanted. The best technique to easily read out such a number of detector with a common readout line is the microwave frequency domain multiplexing. Therefore, the TESs are coupled to multiplexed rf-SQUIDS operated in flux ramp modulation for linearization purposes. The rf-SQUIDS are then coupled to superconducting quarter wavelength resonators in the GHz range, from which the modulating signal is finally recovering using software defined radio techniques. In the last two years an extensive R&D activity has been carried out in order to maximize the multiplexing factor while preserving the performances of each detector which fulfil the HOLMES requirements (i.e. an energy resolution of few eV and a time-resolution of a few microseconds). We report here the progress made towards the characterization of the multiplexing system together with the results of the characterization of the HOLMES detectors.
Published: 2018

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

Author: Baldini, A. M., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Chiri, C., Corvaglia, A., de Bari, A., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwai, R., Iwamoto, T., Kobayashi, S., Kettle, P. -R., Kyle, W., Khomutov, N., Kolesnikov, A., Kravchuk, N., Kuchinskiy, N., Libeiro, T., Lim, G. M. A., Malyshev, V., Matsuzawa, N., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Mtchedilishvili, A., Nakao, M., Natori, H., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Pizzigoni, G., Popov, A., Renga, F., Ritt, S., Rozhdestvensky, A., Rossella, M., Sawada, R., Schwendimann, P., Signorelli, G., Stoykov, A., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Voena, C., Yanai, K., Yudin, Yu. V., Baldini, A. M., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Chiri, C., Corvaglia, A., de Bari, A., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwai, R., Iwamoto, T., Kobayashi, S., Kettle, P. -R., Kyle, W., Khomutov, N., Kolesnikov, A., Kravchuk, N., Kuchinskiy, N., Libeiro, T., Lim, G. M. A., Malyshev, V., Matsuzawa, N., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Mtchedilishvili, A., Nakao, M., Natori, H., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Pizzigoni, G., Popov, A., Renga, F., Ritt, S., Rozhdestvensky, A., Rossella, M., Sawada, R., Schwendimann, P., Signorelli, G., Stoykov, A., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Voena, C., Yanai, K., and Yudin, Yu. V.
Abstract: We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, $\mu^+ \to \mathrm{e}^+\mathrm{X}, \mathrm{X} \to \gamma\gamma$. This search uses a dataset resulting from $7.5\times 10^{14}$ 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$^2$ for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20--40 MeV/c$^2$, down to $\mathcal{O}(10^{-11})$ at 90\% confidence level.
Published: 2020
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22. Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment

Author: Baldini, A. M., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Chiri, C., Corvaglia, A., de Bari, A., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwai, R., Iwamoto, T., Kobayashi, S., Kettle, P. -R., Kyle, W., Khomutov, N., Kolesnikov, A., Kravchuk, N., Kuchinskiy, N., Libeiro, T., Lim, G. M. A., Malyshev, V., Matsuzawa, N., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Mtchedilishvili, A., Nakao, M., Natori, H., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Pizzigoni, G., Popov, A., Renga, F., Ritt, S., Rozhdestvensky, A., Rossella, M., Sawada, R., Schwendimann, P., Signorelli, G., Stoykov, A., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Voena, C., Yanai, K., Yudin, Yu. V., Baldini, A. M., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Chiri, C., Corvaglia, A., de Bari, A., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwai, R., Iwamoto, T., Kobayashi, S., Kettle, P. -R., Kyle, W., Khomutov, N., Kolesnikov, A., Kravchuk, N., Kuchinskiy, N., Libeiro, T., Lim, G. M. A., Malyshev, V., Matsuzawa, N., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Mtchedilishvili, A., Nakao, M., Natori, H., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Pizzigoni, G., Popov, A., Renga, F., Ritt, S., Rozhdestvensky, A., Rossella, M., Sawada, R., Schwendimann, P., Signorelli, G., Stoykov, A., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Voena, C., Yanai, K., and Yudin, Yu. V.
Abstract: We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, $\mu^+ \to \mathrm{e}^+\mathrm{X}, \mathrm{X} \to \gamma\gamma$. This search uses a dataset resulting from $7.5\times 10^{14}$ 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$^2$ for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20--40 MeV/c$^2$, down to $\mathcal{O}(10^{-11})$ at 90\% confidence level.
Published: 2020
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23. Timing resolution of a plastic scintillator counter read out by radiation damaged SiPMs connected in series

Author: Boca, G., Cattaneo, P. W., De Gerone, M., Gatti, F., Nakao, M., Nishimura, M., Ootani, W., Rossella, M., Uchiyama, Y., Usami, M., Yanai, K., Boca, G., Cattaneo, P. W., De Gerone, M., Gatti, F., Nakao, M., Nishimura, M., Ootani, W., Rossella, M., Uchiyama, Y., Usami, M., and Yanai, K.
Abstract: This paper discusses the effects of radiation damage to SiPMs on the performances of plastic scintillator counters with series-connected SiPM readout, focusing on timing measurements. The performances of a counter composed of a $120 \times 40 \times5~\mathrm{mm}^3$ scintillator tile read out by two sets of six SiPMs from AdvanSiD connected in series attached on the short sides are presented, for different combinations of SiPMs at various levels of irradiation. Firstly, six SiPMs were equally irradiated with electrons from $^{90}$Sr sources up to a fluence of $\Phi_\mathrm{e^-}\approx 3 \times 10^{12}~\mathrm{cm}^{-2}$. The timing resolution of the counter gradually deteriorated by the increase in dark current. The dark current and the deterioration were reduced when the counter was cooled from 30$^\circ$C to 10$^\circ$C. Secondly, 33 SiPMs were irradiated with reactor neutrons. The characteristics of counters read out by series-connected SiPMs with non-uniform damage levels, were investigated. The signal pulse height, the time response, and the timing resolution depend on the hit position in the counter, when SiPMs' irradiation is not uniform., Comment: 13 pages, 27 figures, Major revision based on the reviewers' comments
Published: 2020

24. The laser-based time calibration system for the MEG II pixelated Timing Counter

Author: Boca, G., Cattaneo, P. W., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Koga, J., Nakao, M., Nishimura, M., Ootani, W., Rossella, M., Uchiyama, Y., Usami, M., Yanai, K., Yoshida, K., Boca, G., Cattaneo, P. W., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Koga, J., Nakao, M., Nishimura, M., Ootani, W., Rossella, M., Uchiyama, Y., Usami, M., Yanai, K., and Yoshida, K.
Abstract: We have developed a new laser-based time calibration system for highly segmented scintillator counters like the MEG II pixelated Timing Counter (pTC), consisting of 512-centimeter scale scintillator counters read out by silicon photomultipliers (SiPMs). It is difficult to apply previous laser-based calibration methods for conventional meter-scale Time-Of-Flight detectors to the MEG II pTC from the implementation and the accuracy points of view. This paper presents a new laser-based time calibration system which can overcome such difficulties. A laser pulse is split into each scintillator counter via several optical components so that we can directly measure the time offset of each counter relative to the laser-emitted time. We carefully tested all the components and procedures prior to the actual operation. The laser system was installed into the pTC and thoroughly tested under the real experimental condition. The system showed good stability and being sensitive to any change of timing larger than ~10 ps. Moreover, it showed an uncertainty of 48 ps in the determination of the time offsets, which meets our requirements. The new method provides an example of the implementation of a precise timing alignment for the new type of detectors enabled by the advance of SiPM technology., Comment: 11 pages, 17 figures
Published: 2019
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25. A Laser-based Time Calibration System for the MEG II Timing Counter

Author: Nakao, M., Boca, G., Cattaneo, P. W., De Gerone, M., Gatti, F., Nishimura, M., Ootani, W., Rossella, M., Uchiyama, Y., Usami, M., Yoshida, K., Nakao, M., Boca, G., Cattaneo, P. W., De Gerone, M., Gatti, F., Nishimura, M., Ootani, W., Rossella, M., Uchiyama, Y., Usami, M., and Yoshida, K.
Abstract: We have developed a new laser-based time calibration system for the MEG II timing counter dedicated to timing measurement of positrons. The detector requires precise timing alignment between $\sim\,$500 scintillation counters. In this study, we present the calibration system which can directly measure the time offset of each counter relative to the laser-synchronized pulse. We thoroughly tested all the optical components and the uncertainty of this method is estimated to be 24 ps. In 2017, we installed the full system into the MEG II environment and performed a commissioning run. This method shows excellent stability and consistency with another method. The proposed system provides a precise timing alignment for SiPM-based timing detectors. It also has potential in areas such as TOF-PET., Comment: 3 pages, 3 figures, proceedings of the 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference
Published: 2019

26. Results from Pilot Run for MEG II Positron Timing Counter

Author: Nakao, M., De Bari, A., Biasotti, M., Boca, G., Cattaneo, P. W., Francesconi, M., De Gerone, M., Galli, L., Gatti, F., Mtchedilishvili, A., Nicol, D., Nishimura, M., Ootani, W., Ritt, S., Rossella, M., Simonetta, M., Uchiyama, Y., Usami, M., Nakao, M., De Bari, A., Biasotti, M., Boca, G., Cattaneo, P. W., Francesconi, M., De Gerone, M., Galli, L., Gatti, F., Mtchedilishvili, A., Nicol, D., Nishimura, M., Ootani, W., Ritt, S., Rossella, M., Simonetta, M., Uchiyama, Y., and Usami, M.
Abstract: The MEG II experiment at Paul Scherrer Institut in Switzerland will search for the lepton flavour violating muon decay, $\mu^+\to e^+\gamma$, with a sensitivity of $4\times10^{-14}$ improving the existing limit of an order of magnitude. In 2016, we finished the construction of the MEG II Timing Counter, the subdetector dedicated to the measurement of the positron emission time. The first one-fourth of it was installed in the experimental area and we performed a pilot run with the MEG~II beam of $7\times10^{7}\mu^+/$s. The timing resolution reached the design value improving by a factor of two compared to MEG., Comment: 4 pages, 2 figures
Published: 2018
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27. Status of the HOLMES Experiment to Directly Measure the Neutrino Mass

Author: Nucciotti, A., Alpert, B., Balata, M., Bennett, D. BeckerD., Bevilacqua, A., Biasotti, M., Ceriale, V., Ceruti, G., Corsini, D., De Gerone, M., Dressler, R., Faverzani, M., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Gatti, F., Giachero, A., Hays-Wehle, J., Heinitz, S., Hilton, G., Köster, U., Lusignoli, M., Mates, J., Nisi, S., Orlando, A., Parodi, L., Pessina, G., Puiu, A., Ragazzi, S., Reintsema, C., Ribeiro-Gomez, M., Schmidt, D., Schuman, D., Siccardi, F., Swetz, D., Ullom, J., Vale, L., Nucciotti, A., Alpert, B., Balata, M., Bennett, D. BeckerD., Bevilacqua, A., Biasotti, M., Ceriale, V., Ceruti, G., Corsini, D., De Gerone, M., Dressler, R., Faverzani, M., Ferri, E., Fowler, J., Gallucci, G., Gard, J., Gatti, F., Giachero, A., Hays-Wehle, J., Heinitz, S., Hilton, G., Köster, U., Lusignoli, M., Mates, J., Nisi, S., Orlando, A., Parodi, L., Pessina, G., Puiu, A., Ragazzi, S., Reintsema, C., Ribeiro-Gomez, M., Schmidt, D., Schuman, D., Siccardi, F., Swetz, D., Ullom, J., and Vale, L.
Abstract: The assessment of neutrino absolute mass scale is still a crucial challenge in today particle physics and cosmology. Beta or electron capture spectrum end-point study is currently the only experimental method which can provide a model independent measurement of the absolute scale of neutrino mass. HOLMES is an experiment funded by the European Research Council to directly measure the neutrino mass. HOLMES will perform a calorimetric measurement of the energy released in the electron capture decay of the artificial isotope $^{163}$Ho. In a calorimetric measurement the energy released in the decay process is entirely contained into the detector, except for the fraction taken away by the neutrino. This approach eliminates both the issues related to the use of an external source and the systematic uncertainties arising from decays on excited final states. The most suitable detectors for this type of measurement are low temperature thermal detectors, where all the energy released into an absorber is converted into a temperature increase that can be measured by a sensitive thermometer directly coupled with the absorber. This measurement was originally proposed in 1982 by A. De Rujula and M. Lusignoli, but only in the last decade the technological progress in detectors development has allowed to design a sensitive experiment. HOLMES plans to deploy a large array of low temperature microcalorimeters with implanted $^{163}$Ho nuclei. In this contribution we outline the HOLMES project with its physics reach and technical challenges, along with its status and perspectives., Comment: This is a pre-print of an article published in Journal of Low Temperature Physics. The final authenticated version is available online at: https://doi.org/10.1007/s10909-018-2025-x
Published: 2018
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28. The design of the MEG II experiment

Author: 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., Nicoló, 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., Zhang, Y., 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., Nicoló, 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.
Abstract: The MEG experiment, designed to search for the mu+->e+ gamma decay at a 10^-13 sensitivity level, completed data taking in 2013. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6 x 10-14 for the branching ratio, 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., Comment: 61 pages and 97 figures
Published: 2018
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29. The HOLMES Experiment

Author: Faverzani, M, Alpert, B, Backer, D, Bennet, D, Biasotti, M, Brofferio, C, Ceriale, V, Ceruti, G, Corsini, D, Day, P, De Gerone, M, Dressler, R, Ferri, E, Fowler, J, Fumagalli, E, Gard, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Orlando, A, Parodi, L, Pessina, G, Pizzigoni, G, Puiu, P, Ragazzi, S, Reintsema, C, Ribeiro Gomez, M, Schmidt, D, Schuman, D, Siccardi, F, Sisti, M, Swetz, D, Terranova, F, Ullom, J, Vale, L, FAVERZANI, MARCO, BROFFERIO, CHIARA, DAY, PETER KENNETH, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, PUIU, PAUL ANDREI, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, Vale, L., Faverzani, M, Alpert, B, Backer, D, Bennet, D, Biasotti, M, Brofferio, C, Ceriale, V, Ceruti, G, Corsini, D, Day, P, De Gerone, M, Dressler, R, Ferri, E, Fowler, J, Fumagalli, E, Gard, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Orlando, A, Parodi, L, Pessina, G, Pizzigoni, G, Puiu, P, Ragazzi, S, Reintsema, C, Ribeiro Gomez, M, Schmidt, D, Schuman, D, Siccardi, F, Sisti, M, Swetz, D, Terranova, F, Ullom, J, Vale, L, FAVERZANI, MARCO, BROFFERIO, CHIARA, DAY, PETER KENNETH, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, PUIU, PAUL ANDREI, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, and Vale, L.
Abstract: The determination of the neutrino mass is an open issue in modern particle physics and astrophysics. The direct mass measurement is the only theory-unrelated experimental tool capable to probe such quantity. The HOLMES experiment will measure the end-point energy of the electron capture decay of 163Ho, aiming at a statistical sensitivity on the neutrino mass around 1 eV/c2. In order to acquire the large needed statistics by keeping the pile-up contribution as low as possible, 1000 transition edge sensors will be readout simultaneously with the frequency domain readout, a multiplexing technique where the multiplex factor is only limited by the bandwidth of the available commercial fast digitizers. We outline here the HOLMES project with its technical challenges, and its status and perspectives.
Published: 2016

30. HOLMES: The electron capture decay of 163Ho to measure the electron neutrino mass with sub-eV sensitivity

Author: Alpert, B, Balata, M, Bennett, D, Biasotti, M, Boragno, C, Brofferio, C, Ceriale, V, Corsini, D, Day, P, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Pessina, G, Pizzigoni, G, Puiu, P, Ragazzi, S, Reintsema, C, Gomes, M, Schmidt, D, Schumann, D, Sisti, M, Swetz, D, Terranova, F, Ullom, J, BROFFERIO, CHIARA, DAY, PETER KENNETH, FAVERZANI, MARCO, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NIZZOLO, RICCARDO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, PUIU, PAUL ANDREI, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, Ullom, J., Alpert, B, Balata, M, Bennett, D, Biasotti, M, Boragno, C, Brofferio, C, Ceriale, V, Corsini, D, Day, P, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Pessina, G, Pizzigoni, G, Puiu, P, Ragazzi, S, Reintsema, C, Gomes, M, Schmidt, D, Schumann, D, Sisti, M, Swetz, D, Terranova, F, Ullom, J, BROFFERIO, CHIARA, DAY, PETER KENNETH, FAVERZANI, MARCO, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NIZZOLO, RICCARDO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, PUIU, PAUL ANDREI, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, and Ullom, J.
Abstract: The European Research Council has recently funded HOLMES, a new experiment to directly measure the neutrino mass. HOLMES will perform a calorimetric measurement of the energy released in the decay of 163Ho. The calorimetric measurement eliminates systematic uncertainties arising from the use of external beta sources, as in experiments with beta spectrometers. This measurement was proposed in 1982 by A. De Rujula and M. Lusignoli, but only recently the detector technological progress allowed to design a sensitive experiment. HOLMES will deploy a large array of low temperature microcalorimeters with implanted 163Ho nuclei. The resulting mass sensitivity will be as low as 0.4 eV. HOLMES will be an important step forward in the direct neutrino mass measurement with a calorimetric approach as an alternative to spectrometry. It will also establish the potential of this approach to extend the sensitivity down to 0.1 eV. We outline here the project with its technical challenges and perspectives.
Published: 2015

31. HOLMES: The electron capture decay of 163Ho to measure the electron neutrino mass with sub-eV sensitivity

Author: Alpert, B, Balata, M, Bennett, D, Biasotti, M, Boragno, C, Brofferio, C, Ceriale, V, Corsini, D, Day, P, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Pessina, G, Pizzigoni, G, Puiu, P, Ragazzi, S, Reintsema, C, Gomes, M, Schmidt, D, Schumann, D, Sisti, M, Swetz, D, Terranova, F, Ullom, J, BROFFERIO, CHIARA, DAY, PETER KENNETH, FAVERZANI, MARCO, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NIZZOLO, RICCARDO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, PUIU, PAUL ANDREI, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, Ullom, J., Alpert, B, Balata, M, Bennett, D, Biasotti, M, Boragno, C, Brofferio, C, Ceriale, V, Corsini, D, Day, P, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Pessina, G, Pizzigoni, G, Puiu, P, Ragazzi, S, Reintsema, C, Gomes, M, Schmidt, D, Schumann, D, Sisti, M, Swetz, D, Terranova, F, Ullom, J, BROFFERIO, CHIARA, DAY, PETER KENNETH, FAVERZANI, MARCO, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NIZZOLO, RICCARDO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, PUIU, PAUL ANDREI, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, and Ullom, J.
Abstract: The European Research Council has recently funded HOLMES, a new experiment to directly measure the neutrino mass. HOLMES will perform a calorimetric measurement of the energy released in the decay of 163Ho. The calorimetric measurement eliminates systematic uncertainties arising from the use of external beta sources, as in experiments with beta spectrometers. This measurement was proposed in 1982 by A. De Rujula and M. Lusignoli, but only recently the detector technological progress allowed to design a sensitive experiment. HOLMES will deploy a large array of low temperature microcalorimeters with implanted 163Ho nuclei. The resulting mass sensitivity will be as low as 0.4 eV. HOLMES will be an important step forward in the direct neutrino mass measurement with a calorimetric approach as an alternative to spectrometry. It will also establish the potential of this approach to extend the sensitivity down to 0.1 eV. We outline here the project with its technical challenges and perspectives.
Published: 2015

32. HOLMES, an experiment for a direct measurement of neutrino mass

Author: Puiu, P, Alpert, B, Balata, M, Bennett, D, Biasotti, M, Boragno, C, Brofferio, C, Ceriale, V, Corsini, D, Day, P, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Pessina, G, Pizzigoni, G, Ragazzi, S, Reintsema, C, Gomez, M, Schmidt, D, Schumann, D, Sisti, M, Swetz, D, Terranova, F, Ullom, J, PUIU, PAUL ANDREI, BROFFERIO, CHIARA, FAVERZANI, MARCO, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NIZZOLO, RICCARDO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, Ullom, J., Puiu, P, Alpert, B, Balata, M, Bennett, D, Biasotti, M, Boragno, C, Brofferio, C, Ceriale, V, Corsini, D, Day, P, De Gerone, M, Dressler, R, Faverzani, M, Ferri, E, Fowler, J, Gatti, F, Giachero, A, Hays Wehle, J, Heinitz, S, Hilton, G, Köster, U, Lusignoli, M, Maino, M, Mates, J, Nisi, S, Nizzolo, R, Nucciotti, A, Pessina, G, Pizzigoni, G, Ragazzi, S, Reintsema, C, Gomez, M, Schmidt, D, Schumann, D, Sisti, M, Swetz, D, Terranova, F, Ullom, J, PUIU, PAUL ANDREI, BROFFERIO, CHIARA, FAVERZANI, MARCO, FERRI, ELENA, GIACHERO, ANDREA, MAINO, MATTEO, NIZZOLO, RICCARDO, NUCCIOTTI, ANGELO ENRICO LODOVICO, PESSINA, GIANLUIGI EZIO, RAGAZZI, STEFANO, SISTI, MONICA, TERRANOVA, FRANCESCO, and Ullom, J.
Abstract: The European Research Council has recently founded HOLMES, an experiment for a direct neutrino mass measurement with a sensitivity as low as 0.4 eV. HOLMES will perform a calorimetric measurement of the the energy released in the Electron Capture (EC) spectrum of 163Ho. The neutrino mass is assessed from the end point of the spectrum; the sensitivity on the mass is strongly dependent on the exact value of the end point, still not precisely known, and on background due to pile up in the region of interest. In the following lines we present an overview of the whole project and its major challenges.
Published: 2015

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

Author: Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, G., Chiri, C., De Bari, A., De Gerone, M., DÓnofrio, 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, T. I., Kettle, P. R., Khazin, B. I., Khomutov, N., Korenchenko, A., Kravchuk, N., Lim, G. M. A., Mihara, S., Molzon, W., Mori, T., Mtchedlishvili, A., Nakaura, S., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Ootani, W., Panareo, M., Papa, A., Pepino, A., Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, G., Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., Yudin, Y. V., Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, G., Chiri, C., De Bari, A., De Gerone, M., DÓnofrio, 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, T. I., Kettle, P. R., Khazin, B. I., Khomutov, N., Korenchenko, A., Kravchuk, N., Lim, G. M. A., Mihara, S., Molzon, W., Mori, T., Mtchedlishvili, A., Nakaura, S., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Ootani, W., Panareo, M., Papa, A., Pepino, A., Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, G., Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., and Yudin, Y. V.
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: 2015
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34. Time resolution of time-of-flight detector based on multiple scintillation counters readout by SiPMs

Author: Cattaneo, P. W., De Gerone, M., Gatti, F., Nishimura, M., Ootani, W., Rossella, M., Shirabe, S., Uchiyama, Y., Cattaneo, P. W., De Gerone, M., Gatti, F., Nishimura, M., Ootani, W., Rossella, M., Shirabe, S., and Uchiyama, Y.
Abstract: A new timing detector measuring ~50 MeV/c positrons is under development for the MEG II experiment, aiming at a time resolution $\sigma_t \sim 30~\mathrm{ps}$. The resolution is expected to be achieved by measuring each positron time with multiple counters made of plastic scintillator readout by silicon photomultipliers (SiPMs). The purpose of this work is to demonstrate the time resolution for ~50 MeV/c positrons using prototype counters. Counters with dimensions of $90\times 40\times 5~\mathrm{mm}^3$ readout by six SiPMs (three on each $40\times 5~\mathrm{mm}^2$ plane) were built with SiPMs from Hamamatsu Photonics and AdvanSiD and tested in a positron beam at the DA$\Phi$NE Beam Test Facility. The time resolution was found to improve nearly as the square root of the number of counter hits. A time resolution $\sigma_t=26.2\pm1.3~\mathrm{ps}$ was obtained with eight counters with Hamamatsu SiPMs. These results suggest that the design resolution is achievable in the MEG II experiment., Comment: 12 pages, 18 figures. Published in NIM A
Published: 2015
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35. The Hot and Energetic Universe: The X-ray Integral Field Unit (X-IFU) for Athena+

Author: Barret, D., Herder, J. W. den, Piro, L., Ravera, L., Hartog, R. Den, Macculi, C., Barcons, X., Page, M., Paltani, S., Rauw, G., Wilms, J., Ceballos, M., Duband, L., Gottardi, L., Lotti, S., de Plaa, J., Pointecouteau, E., Schmid, C., Akamatsu, H., Bagliani, D., Bandler, S., Barbera, M., Bastia, P., Biasotti, M., Branco, M., Camon, A., Cara, C., Cobo, B., Colasanti, L., Costa-Kramer, J. L., Corcione, L., Doriese, W., Duval, J. M., Fabrega, L., Gatti, F., de Gerone, M., Guttridge, P., Kelley, R., Kilbourne, C., van der Kuur, J., Mineo, T., Mitsuda, K., Natalucci, L., Ohashi, T., Peille, P., Perinati, E., Pigot, C., Pizzigoni, G., Pobes, C., Porter, F., Renotte, E., Sauvageot, J. L., Sciortino, S., Torrioli, G., Valenziano, L., Willingale, D., de Vries, C., van Weers, H., Barret, D., Herder, J. W. den, Piro, L., Ravera, L., Hartog, R. Den, Macculi, C., Barcons, X., Page, M., Paltani, S., Rauw, G., Wilms, J., Ceballos, M., Duband, L., Gottardi, L., Lotti, S., de Plaa, J., Pointecouteau, E., Schmid, C., Akamatsu, H., Bagliani, D., Bandler, S., Barbera, M., Bastia, P., Biasotti, M., Branco, M., Camon, A., Cara, C., Cobo, B., Colasanti, L., Costa-Kramer, J. L., Corcione, L., Doriese, W., Duval, J. M., Fabrega, L., Gatti, F., de Gerone, M., Guttridge, P., Kelley, R., Kilbourne, C., van der Kuur, J., Mineo, T., Mitsuda, K., Natalucci, L., Ohashi, T., Peille, P., Perinati, E., Pigot, C., Pizzigoni, G., Pobes, C., Porter, F., Renotte, E., Sauvageot, J. L., Sciortino, S., Torrioli, G., Valenziano, L., Willingale, D., de Vries, C., and van Weers, H.
Abstract: The Athena+ mission concept is designed to implement the Hot and Energetic Universe science theme submitted to the European Space Agency in response to the call for White Papers for the definition of the L2 and L3 missions of its science program. The Athena+ science payload consists of a large aperture high angular resolution X-ray optics and twelve meters away, two interchangeable focal plane instruments: the X-ray Integral Field Unit (X-IFU) and the Wide Field Imager (WFI). The X-IFU is a cryogenic X-ray spectrometer, based on a large array of Transition Edge Sensors (TES), offering 2.5 eV spectral resolution, with ~5" pixels, over a field of view of 5 arc minutes in diameter. In this paper, we briefly describe the Athena+ mission concept and the X-IFU performance requirements. We then present the X-IFU detector and readout electronics principles, the current design of the focal plane assembly, the cooling chain and review the global architecture design. Finally, we describe the current performance estimates, in terms of effective area, particle background rejection, count rate capability and velocity measurements. Finally, we emphasize on the latest technology developments concerning TES array fabrication, spectral resolution and readout performance achieved to show that significant progresses are being accomplished towards the demanding X-IFU requirements., Comment: Supporting paper for the science theme "The Hot and Energetic Universe" to be implemented by the Athena+ X-ray observatory (http://www.the-athena-x-ray-observatory.eu). 17 pages, 19 figures
Published: 2013

36. MEG Upgrade Proposal

Author: Baldini, A. M., Cei, F., Cerri, C., Dussoni, S., Galli, L., Grassi, M., Nicolò, D., Raffaelli, F., Sergiampietri, F., Signorelli, G., Tenchini, F., Bagliani, D., De Gerone, M., Gatti, F., Baracchini, E., Fujii, Y., Iwamoto, T., Kaneko, D., Mori, T., Nishimura, M., Ootani, W., Sawada, R., Uchiyama, Y., Boca, G., Cattaneo, P. W., de Bari, A., Nardò, R., Rossella, M., Cascella, M., Grancagnolo, F., L'Erario, A., Maffezzoli, A., Miccoli, A., Onorato, G., Palamà, G., Panareo, M., Pepino, A., Rella, S., Tassielli, G. F., Zavarise, G., Cavoto, G., Graziosi, A., Piredda, G., Ripiccini, E., Voena, C., Grigoriev, D. N., Ignatov, F., Khazin, B. I., Popov, A., Yudin, Yu. V., Haruyama, T., Mihara, S., Nishiguchi, H., Yamamoto, A., Hildebrandt, M., Kettle, P. -R., Papa, A., Renga, F., Ritt, S., Stoykov, A., Kang, T. I., Lim, G., Molzon, W., You, Z., Khomutov, N., Korenchenko, A., Kravchuk, N., Kuchinksy, N., Baldini, A. M., Cei, F., Cerri, C., Dussoni, S., Galli, L., Grassi, M., Nicolò, D., Raffaelli, F., Sergiampietri, F., Signorelli, G., Tenchini, F., Bagliani, D., De Gerone, M., Gatti, F., Baracchini, E., Fujii, Y., Iwamoto, T., Kaneko, D., Mori, T., Nishimura, M., Ootani, W., Sawada, R., Uchiyama, Y., Boca, G., Cattaneo, P. W., de Bari, A., Nardò, R., Rossella, M., Cascella, M., Grancagnolo, F., L'Erario, A., Maffezzoli, A., Miccoli, A., Onorato, G., Palamà, G., Panareo, M., Pepino, A., Rella, S., Tassielli, G. F., Zavarise, G., Cavoto, G., Graziosi, A., Piredda, G., Ripiccini, E., Voena, C., Grigoriev, D. N., Ignatov, F., Khazin, B. I., Popov, A., Yudin, Yu. V., Haruyama, T., Mihara, S., Nishiguchi, H., Yamamoto, A., Hildebrandt, M., Kettle, P. -R., Papa, A., Renga, F., Ritt, S., Stoykov, A., Kang, T. I., Lim, G., Molzon, W., You, Z., Khomutov, N., Korenchenko, A., Kravchuk, N., and Kuchinksy, N.
Abstract: We propose the continuation of the MEG experiment to search for the charged lepton flavour violating decay (cLFV) \mu \to e \gamma, based on an upgrade of the experiment, which aims for a sensitivity enhancement of one order of magnitude compared to the final MEG result, down to the $6 \times 10^{-14}$ level. The key features of this new MEG upgrade are an increased rate capability of all detectors to enable running at the intensity frontier and improved energy, angular and timing resolutions, for both the positron and photon arms of the detector. On the positron-side a new low-mass, single volume, high granularity tracker is envisaged, in combination with a new highly segmented, fast timing counter array, to track positron from a thinner stopping target. The photon-arm, with the largest liquid xenon (LXe) detector in the world, totalling 900 l, will also be improved by increasing the granularity at the incident face, by replacing the current photomultiplier tubes (PMTs) with a larger number of smaller photosensors and optimizing the photosensor layout also on the lateral faces. A new DAQ scheme involving the implementation of a new combined readout board capable of integrating the diverse functions of digitization, trigger capability and splitter functionality into one condensed unit, is also under development. We describe here the status of the MEG experiment, the scientific merits of the upgrade and the experimental methods we plan to use., Comment: A. M. Baldini and T. Mori Spokespersons. Research proposal submitted to the Paul Scherrer Institute Research Committee for Particle Physics at the Ring Cyclotron. 131 Pages
Published: 2013

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

Author: MEG Collaboration, Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, G., Chiri, C., 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, M., Papa, A., Pepino, A., Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, G. F., Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., Yudin, Yu. V., MEG Collaboration, Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, G., Chiri, C., 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, M., Papa, A., Pepino, A., Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, G. F., Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., and Yudin, Yu. V.
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
Published: 2013
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38. The Hot and Energetic Universe: The X-ray Integral Field Unit (X-IFU) for Athena+

Author: Barret, D., Herder, J. W. den, Piro, L., Ravera, L., Hartog, R. Den, Macculi, C., Barcons, X., Page, M., Paltani, S., Rauw, G., Wilms, J., Ceballos, M., Duband, L., Gottardi, L., Lotti, S., de Plaa, J., Pointecouteau, E., Schmid, C., Akamatsu, H., Bagliani, D., Bandler, S., Barbera, M., Bastia, P., Biasotti, M., Branco, M., Camon, A., Cara, C., Cobo, B., Colasanti, L., Costa-Kramer, J. L., Corcione, L., Doriese, W., Duval, J. M., Fabrega, L., Gatti, F., de Gerone, M., Guttridge, P., Kelley, R., Kilbourne, C., van der Kuur, J., Mineo, T., Mitsuda, K., Natalucci, L., Ohashi, T., Peille, P., Perinati, E., Pigot, C., Pizzigoni, G., Pobes, C., Porter, F., Renotte, E., Sauvageot, J. L., Sciortino, S., Torrioli, G., Valenziano, L., Willingale, D., de Vries, C., van Weers, H., Barret, D., Herder, J. W. den, Piro, L., Ravera, L., Hartog, R. Den, Macculi, C., Barcons, X., Page, M., Paltani, S., Rauw, G., Wilms, J., Ceballos, M., Duband, L., Gottardi, L., Lotti, S., de Plaa, J., Pointecouteau, E., Schmid, C., Akamatsu, H., Bagliani, D., Bandler, S., Barbera, M., Bastia, P., Biasotti, M., Branco, M., Camon, A., Cara, C., Cobo, B., Colasanti, L., Costa-Kramer, J. L., Corcione, L., Doriese, W., Duval, J. M., Fabrega, L., Gatti, F., de Gerone, M., Guttridge, P., Kelley, R., Kilbourne, C., van der Kuur, J., Mineo, T., Mitsuda, K., Natalucci, L., Ohashi, T., Peille, P., Perinati, E., Pigot, C., Pizzigoni, G., Pobes, C., Porter, F., Renotte, E., Sauvageot, J. L., Sciortino, S., Torrioli, G., Valenziano, L., Willingale, D., de Vries, C., and van Weers, H.
Abstract: The Athena+ mission concept is designed to implement the Hot and Energetic Universe science theme submitted to the European Space Agency in response to the call for White Papers for the definition of the L2 and L3 missions of its science program. The Athena+ science payload consists of a large aperture high angular resolution X-ray optics and twelve meters away, two interchangeable focal plane instruments: the X-ray Integral Field Unit (X-IFU) and the Wide Field Imager (WFI). The X-IFU is a cryogenic X-ray spectrometer, based on a large array of Transition Edge Sensors (TES), offering 2.5 eV spectral resolution, with ~5" pixels, over a field of view of 5 arc minutes in diameter. In this paper, we briefly describe the Athena+ mission concept and the X-IFU performance requirements. We then present the X-IFU detector and readout electronics principles, the current design of the focal plane assembly, the cooling chain and review the global architecture design. Finally, we describe the current performance estimates, in terms of effective area, particle background rejection, count rate capability and velocity measurements. Finally, we emphasize on the latest technology developments concerning TES array fabrication, spectral resolution and readout performance achieved to show that significant progresses are being accomplished towards the demanding X-IFU requirements., Comment: Supporting paper for the science theme "The Hot and Energetic Universe" to be implemented by the Athena+ X-ray observatory (http://www.the-athena-x-ray-observatory.eu). 17 pages, 19 figures
Published: 2013

39. New constraint on the existence of the mu+-> e+ gamma decay

Author: MEG Collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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., Graziosi, A., Grigoriev, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kaneko, D., Kettle, P. -R., Khazin, B. I., Khomotov, N., Kiselev, O., Korenchenko, A., Kravchuk, N., Lim, G., Maki, A., Mihara, S., Molzon, W., Mori, T., Mzavia, D., Nardo, R., Natori, H., Nicolo, D., Nishiguchi, H., Nishimura, Y., Ootani, W., Panareo, M., Papa, A., Pazzi, R., 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., Valle, R., Voena, C., Xiao, F., Yamada, S., Yamamoto, A., Yamashita, S., You, Z., Yudin, Yu. V., Zanello, D., MEG Collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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., Graziosi, A., Grigoriev, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kaneko, D., Kettle, P. -R., Khazin, B. I., Khomotov, N., Kiselev, O., Korenchenko, A., Kravchuk, N., Lim, G., Maki, A., Mihara, S., Molzon, W., Mori, T., Mzavia, D., Nardo, R., Natori, H., Nicolo, D., Nishiguchi, H., Nishimura, Y., Ootani, W., Panareo, M., Papa, A., Pazzi, R., 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., Valle, R., Voena, C., Xiao, F., Yamada, S., Yamamoto, A., Yamashita, S., You, Z., Yudin, Yu. V., and Zanello, D.
Abstract: The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma 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 \times 10^-13 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG., Comment: 5 pages, 3 figures, a version accepted in Phys. Rev. Lett
Published: 2013

40. MEG Upgrade Proposal

Author: Baldini, A. M., Cei, F., Cerri, C., Dussoni, S., Galli, L., Grassi, M., Nicolò, D., Raffaelli, F., Sergiampietri, F., Signorelli, G., Tenchini, F., Bagliani, D., De Gerone, M., Gatti, F., Baracchini, E., Fujii, Y., Iwamoto, T., Kaneko, D., Mori, T., Nishimura, M., Ootani, W., Sawada, R., Uchiyama, Y., Boca, G., Cattaneo, P. W., de Bari, A., Nardò, R., Rossella, M., Cascella, M., Grancagnolo, F., L'Erario, A., Maffezzoli, A., Miccoli, A., Onorato, G., Palamà, G., Panareo, M., Pepino, A., Rella, S., Tassielli, G. F., Zavarise, G., Cavoto, G., Graziosi, A., Piredda, G., Ripiccini, E., Voena, C., Grigoriev, D. N., Ignatov, F., Khazin, B. I., Popov, A., Yudin, Yu. V., Haruyama, T., Mihara, S., Nishiguchi, H., Yamamoto, A., Hildebrandt, M., Kettle, P. -R., Papa, A., Renga, F., Ritt, S., Stoykov, A., Kang, T. I., Lim, G., Molzon, W., You, Z., Khomutov, N., Korenchenko, A., Kravchuk, N., Kuchinksy, N., Baldini, A. M., Cei, F., Cerri, C., Dussoni, S., Galli, L., Grassi, M., Nicolò, D., Raffaelli, F., Sergiampietri, F., Signorelli, G., Tenchini, F., Bagliani, D., De Gerone, M., Gatti, F., Baracchini, E., Fujii, Y., Iwamoto, T., Kaneko, D., Mori, T., Nishimura, M., Ootani, W., Sawada, R., Uchiyama, Y., Boca, G., Cattaneo, P. W., de Bari, A., Nardò, R., Rossella, M., Cascella, M., Grancagnolo, F., L'Erario, A., Maffezzoli, A., Miccoli, A., Onorato, G., Palamà, G., Panareo, M., Pepino, A., Rella, S., Tassielli, G. F., Zavarise, G., Cavoto, G., Graziosi, A., Piredda, G., Ripiccini, E., Voena, C., Grigoriev, D. N., Ignatov, F., Khazin, B. I., Popov, A., Yudin, Yu. V., Haruyama, T., Mihara, S., Nishiguchi, H., Yamamoto, A., Hildebrandt, M., Kettle, P. -R., Papa, A., Renga, F., Ritt, S., Stoykov, A., Kang, T. I., Lim, G., Molzon, W., You, Z., Khomutov, N., Korenchenko, A., Kravchuk, N., and Kuchinksy, N.
Abstract: We propose the continuation of the MEG experiment to search for the charged lepton flavour violating decay (cLFV) \mu \to e \gamma, based on an upgrade of the experiment, which aims for a sensitivity enhancement of one order of magnitude compared to the final MEG result, down to the $6 \times 10^{-14}$ level. The key features of this new MEG upgrade are an increased rate capability of all detectors to enable running at the intensity frontier and improved energy, angular and timing resolutions, for both the positron and photon arms of the detector. On the positron-side a new low-mass, single volume, high granularity tracker is envisaged, in combination with a new highly segmented, fast timing counter array, to track positron from a thinner stopping target. The photon-arm, with the largest liquid xenon (LXe) detector in the world, totalling 900 l, will also be improved by increasing the granularity at the incident face, by replacing the current photomultiplier tubes (PMTs) with a larger number of smaller photosensors and optimizing the photosensor layout also on the lateral faces. A new DAQ scheme involving the implementation of a new combined readout board capable of integrating the diverse functions of digitization, trigger capability and splitter functionality into one condensed unit, is also under development. We describe here the status of the MEG experiment, the scientific merits of the upgrade and the experimental methods we plan to use., Comment: A. M. Baldini and T. Mori Spokespersons. Research proposal submitted to the Paul Scherrer Institute Research Committee for Particle Physics at the Ring Cyclotron. 131 Pages
Published: 2013

41. The MEG detector for ${\mu}+\to e+{\gamma}$ decay search

Author: Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Cerri, C., Corbo, M., Curalli, N., De Bari, A., De Gerone, M., Del Frate, L., Doke, S., Dussoni, S., Egger, J., Fratini, K., Fujii, Y., Galli, L., Galeotti, S., Gallucci, G., Gatti, F., Golden, B., Grassi, M., Graziosi, A., Grigoriev, D. N., Haruyama, T., Hisamatsu, M. Hildebrandt Y., Ignatov, F., Iwamoto, T., Kaneko, D., Kasami, K., Kettle, P. -R., Khazin, B. I., Korenchenko, O. Kiselev A., Kravchuk, N., Lim, G., Maki, A., Mihara, S., Molzon, W., Mori, T., Morsani, F., Mzavia, D., Nardò, R., Natori, H., Nicolò, D., Nishiguchi, H., Ootani, Y. Nishimura W., Ozone, K., Panareo, M., Papa, A., Pazzi, R., Piredda, G., Popov, A., Raffaelli, F., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Sawada, R., Schneebeli, M., Sergiampietri, F., Signorelli, G., Suzuki, S., Tenchini, F., Topchyan, C., Uchiyama, Y., Voena, R. Valle C., Xiao, F., Yamada, S., Yamamoto, S., Yamashita, S., Yudin, Yu. V., Zanello, D., Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Cerri, C., Corbo, M., Curalli, N., De Bari, A., De Gerone, M., Del Frate, L., Doke, S., Dussoni, S., Egger, J., Fratini, K., Fujii, Y., Galli, L., Galeotti, S., Gallucci, G., Gatti, F., Golden, B., Grassi, M., Graziosi, A., Grigoriev, D. N., Haruyama, T., Hisamatsu, M. Hildebrandt Y., Ignatov, F., Iwamoto, T., Kaneko, D., Kasami, K., Kettle, P. -R., Khazin, B. I., Korenchenko, O. Kiselev A., Kravchuk, N., Lim, G., Maki, A., Mihara, S., Molzon, W., Mori, T., Morsani, F., Mzavia, D., Nardò, R., Natori, H., Nicolò, D., Nishiguchi, H., Ootani, Y. Nishimura W., Ozone, K., Panareo, M., Papa, A., Pazzi, R., Piredda, G., Popov, A., Raffaelli, F., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Sawada, R., Schneebeli, M., Sergiampietri, F., Signorelli, G., Suzuki, S., Tenchini, F., Topchyan, C., Uchiyama, Y., Voena, R. Valle C., Xiao, F., Yamada, S., Yamamoto, S., Yamashita, S., Yudin, Yu. V., and Zanello, D.
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 \meg\ by using one of the most intense continuous $\mu^+$ 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., Comment: 59 pages, 90 figures
Published: 2013
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42. Measurement of the radiative decay of polarized muons in the MEG experiment

Author: MEG Collaboration, Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, G., Chiri, C., 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, M., Papa, A., Pepino, A., Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, G. F., Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., Yudin, Yu. V., MEG Collaboration, Baldini, A. M., Bao, Y., Baracchini, E., Bemporad, C., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiarello, G., Chiri, C., 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, M., Papa, A., Pepino, A., Piredda, G., Pizzigoni, G., Popov, A., Renga, F., Ripiccini, E., Ritt, S., Rossella, M., Rutar, G., Sawada, R., Sergiampietri, F., Signorelli, G., Tassielli, G. F., Tenchini, F., Uchiyama, Y., Venturini, M., Voena, C., Yamamoto, A., Yoshida, K., You, Z., and Yudin, Yu. V.
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
Published: 2013
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43. Design and test of an extremely high resolution Timing Counter for the MEG II experiment: preliminary results

Author: De Gerone, M., Gatti, F., Ootani, W., Uchiyama, Y., Nishimura, M., Shirabe, S., Cattaneo, P. W., Rossella, M., De Gerone, M., Gatti, F., Ootani, W., Uchiyama, Y., Nishimura, M., Shirabe, S., Cattaneo, P. W., and Rossella, M.
Abstract: The design and tests of Timing Counter elements for the upgrade of the MEG experiment, MEG II,is presented. The detector is based on several small plates of scintillator with a Silicon PhotoMultipliers dual-side readout. The optimisation of the single counter elements (SiPMs, scintillators, geometry) is described. Moreover, the results obtained with a first prototype tested at the Beam Test Facility (BTF) of the INFN Laboratori Nazionali di Frascati (LNF) are presented., Comment: 10 pages, 7 figures. Presented at the 13th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD13) 7-10 October 2013 Siena, Italy
Published: 2013
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44. Search for anomalies in the neutrino sector with muon spectrometers and large LArTPC imaging detectors at CERN

Author: Antonello, M., Bagliani, D., Baibussinov, B., Bilokon, H., Boffelli, F., Bonesini, M., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dequal, D., Dermenev, A., Dolfini, R., De Gerone, M., Dussoni, S., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Garvey, G. T., Gatti, F., Gibin, D., Gninenko, S., Guber, F., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kirsanov, M., Kisiel, J., Kochanek, I., Kurepin, A., Lagoda, J., Lucchini, G., Louis, W. C., Mania, S., Mannocchi, G., Marchini, S., Matveev, V., Menegolli, A., Meng, G., Mills, G. B., Montanari, C., Nicoletto, M., Otwinowski, S., Palczewki, T. J., Passardi, G., Perfetto, F., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Stefan, D., Stepaniak, J., Sulej, R., Suvorova, O., Terrani, M., Tlisov, D., Van de Water, R. G., Trinchero, G., Turcato, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zani, A., Zaremba, K, Benettoni, M., Bernardini, P., Bertolin, A., Brugnera, R., Calabrese, M., Cecchetti, A., Cecchini, S., Collazuol, G., Creti, P., Corso, F. Dal, Del Prete, A., De Mitri, I., De Robertis, G., De Serio, M., Esposti, L. Degli, Di Ferdinando, D., Dore, U., Dusini, S., Fabbricatore, P., Fanin, C., Fini, R. A., Fiore, G., Garfagnini, A., Giacomelli, G., Giacomelli, R., Guandalini, C., Guerzoni, M., Kose, U., Laurenti, G., Laveder, M., Lippi, I., Loddo, F., Longhin, A., Loverre, P., Mancarella, G., Mandrioli, G., Margiotta, A., Marsella, G., Mauri, N., Medinaceli, E., Mengucci, A., Mezzetto, M., Michinelli, R., Muciaccia, M. T., Orecchini, D., Paoloni, A., Papadia, G., Pastore, A., Patrizii, L., Pozzato, M., Rosa, G., Sahnounm, Z., Simone, S., Sioli, M., Sirri, G., Spurio, M., Stanco, L., Surdo, A., Tenti, M., Togo, V., Ventura, M., Zago, M., Antonello, M., Bagliani, D., Baibussinov, B., Bilokon, H., Boffelli, F., Bonesini, M., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dequal, D., Dermenev, A., Dolfini, R., De Gerone, M., Dussoni, S., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Garvey, G. T., Gatti, F., Gibin, D., Gninenko, S., Guber, F., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kirsanov, M., Kisiel, J., Kochanek, I., Kurepin, A., Lagoda, J., Lucchini, G., Louis, W. C., Mania, S., Mannocchi, G., Marchini, S., Matveev, V., Menegolli, A., Meng, G., Mills, G. B., Montanari, C., Nicoletto, M., Otwinowski, S., Palczewki, T. J., Passardi, G., Perfetto, F., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Stefan, D., Stepaniak, J., Sulej, R., Suvorova, O., Terrani, M., Tlisov, D., Van de Water, R. G., Trinchero, G., Turcato, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zani, A., Zaremba, K, Benettoni, M., Bernardini, P., Bertolin, A., Brugnera, R., Calabrese, M., Cecchetti, A., Cecchini, S., Collazuol, G., Creti, P., Corso, F. Dal, Del Prete, A., De Mitri, I., De Robertis, G., De Serio, M., Esposti, L. Degli, Di Ferdinando, D., Dore, U., Dusini, S., Fabbricatore, P., Fanin, C., Fini, R. A., Fiore, G., Garfagnini, A., Giacomelli, G., Giacomelli, R., Guandalini, C., Guerzoni, M., Kose, U., Laurenti, G., Laveder, M., Lippi, I., Loddo, F., Longhin, A., Loverre, P., Mancarella, G., Mandrioli, G., Margiotta, A., Marsella, G., Mauri, N., Medinaceli, E., Mengucci, A., Mezzetto, M., Michinelli, R., Muciaccia, M. T., Orecchini, D., Paoloni, A., Papadia, G., Pastore, A., Patrizii, L., Pozzato, M., Rosa, G., Sahnounm, Z., Simone, S., Sioli, M., Sirri, G., Spurio, M., Stanco, L., Surdo, A., Tenti, M., Togo, V., Ventura, M., and Zago, M.
Abstract: A new experiment with an intense ~2 GeV neutrino beam at CERN SPS is proposed in order to definitely clarify the possible existence of additional neutrino states, as pointed out by neutrino calibration source experiments, reactor and accelerator experiments and measure the corresponding oscillation parameters. The experiment is based on two identical LAr-TPCs complemented by magnetized spectrometers detecting electron and muon neutrino events at Far and Near positions, 1600 m and 300 m from the proton target, respectively. The ICARUS T600 detector, the largest LAr-TPC ever built with a size of about 600 ton of imaging mass, now running in the LNGS underground laboratory, will be moved at the CERN Far position. An additional 1/4 of the T600 detector (T150) will be constructed and located in the Near position. Two large area spectrometers will be placed downstream of the two LAr-TPC detectors to perform charge identification and muon momentum measurements from sub-GeV to several GeV energy range, greatly complementing the physics capabilities. This experiment will offer remarkable discovery potentialities, collecting a very large number of unbiased events both in the neutrino and antineutrino channels, largely adequate to definitely settle the origin of the observed neutrino-related anomalies., Comment: Contribution to the European Strategy for Particle Physics - Open Symposium Preparatory Group, Kracow 10-12 September 2012
Published: 2012

45. Search for anomalies in the neutrino sector with muon spectrometers and large LArTPC imaging detectors at CERN

Author: Antonello, M., Bagliani, D., Baibussinov, B., Bilokon, H., Boffelli, F., Bonesini, M., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dequal, D., Dermenev, A., Dolfini, R., De Gerone, M., Dussoni, S., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Garvey, G. T., Gatti, F., Gibin, D., Gninenko, S., Guber, F., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kirsanov, M., Kisiel, J., Kochanek, I., Kurepin, A., Lagoda, J., Lucchini, G., Louis, W. C., Mania, S., Mannocchi, G., Marchini, S., Matveev, V., Menegolli, A., Meng, G., Mills, G. B., Montanari, C., Nicoletto, M., Otwinowski, S., Palczewki, T. J., Passardi, G., Perfetto, F., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Stefan, D., Stepaniak, J., Sulej, R., Suvorova, O., Terrani, M., Tlisov, D., Van de Water, R. G., Trinchero, G., Turcato, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zani, A., Zaremba, K, Benettoni, M., Bernardini, P., Bertolin, A., Brugnera, R., Calabrese, M., Cecchetti, A., Cecchini, S., Collazuol, G., Creti, P., Corso, F. Dal, Del Prete, A., De Mitri, I., De Robertis, G., De Serio, M., Esposti, L. Degli, Di Ferdinando, D., Dore, U., Dusini, S., Fabbricatore, P., Fanin, C., Fini, R. A., Fiore, G., Garfagnini, A., Giacomelli, G., Giacomelli, R., Guandalini, C., Guerzoni, M., Kose, U., Laurenti, G., Laveder, M., Lippi, I., Loddo, F., Longhin, A., Loverre, P., Mancarella, G., Mandrioli, G., Margiotta, A., Marsella, G., Mauri, N., Medinaceli, E., Mengucci, A., Mezzetto, M., Michinelli, R., Muciaccia, M. T., Orecchini, D., Paoloni, A., Papadia, G., Pastore, A., Patrizii, L., Pozzato, M., Rosa, G., Sahnounm, Z., Simone, S., Sioli, M., Sirri, G., Spurio, M., Stanco, L., Surdo, A., Tenti, M., Togo, V., Ventura, M., Zago, M., Antonello, M., Bagliani, D., Baibussinov, B., Bilokon, H., Boffelli, F., Bonesini, M., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dequal, D., Dermenev, A., Dolfini, R., De Gerone, M., Dussoni, S., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Garvey, G. T., Gatti, F., Gibin, D., Gninenko, S., Guber, F., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kirsanov, M., Kisiel, J., Kochanek, I., Kurepin, A., Lagoda, J., Lucchini, G., Louis, W. C., Mania, S., Mannocchi, G., Marchini, S., Matveev, V., Menegolli, A., Meng, G., Mills, G. B., Montanari, C., Nicoletto, M., Otwinowski, S., Palczewki, T. J., Passardi, G., Perfetto, F., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Stefan, D., Stepaniak, J., Sulej, R., Suvorova, O., Terrani, M., Tlisov, D., Van de Water, R. G., Trinchero, G., Turcato, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zani, A., Zaremba, K, Benettoni, M., Bernardini, P., Bertolin, A., Brugnera, R., Calabrese, M., Cecchetti, A., Cecchini, S., Collazuol, G., Creti, P., Corso, F. Dal, Del Prete, A., De Mitri, I., De Robertis, G., De Serio, M., Esposti, L. Degli, Di Ferdinando, D., Dore, U., Dusini, S., Fabbricatore, P., Fanin, C., Fini, R. A., Fiore, G., Garfagnini, A., Giacomelli, G., Giacomelli, R., Guandalini, C., Guerzoni, M., Kose, U., Laurenti, G., Laveder, M., Lippi, I., Loddo, F., Longhin, A., Loverre, P., Mancarella, G., Mandrioli, G., Margiotta, A., Marsella, G., Mauri, N., Medinaceli, E., Mengucci, A., Mezzetto, M., Michinelli, R., Muciaccia, M. T., Orecchini, D., Paoloni, A., Papadia, G., Pastore, A., Patrizii, L., Pozzato, M., Rosa, G., Sahnounm, Z., Simone, S., Sioli, M., Sirri, G., Spurio, M., Stanco, L., Surdo, A., Tenti, M., Togo, V., Ventura, M., and Zago, M.
Abstract: A new experiment with an intense ~2 GeV neutrino beam at CERN SPS is proposed in order to definitely clarify the possible existence of additional neutrino states, as pointed out by neutrino calibration source experiments, reactor and accelerator experiments and measure the corresponding oscillation parameters. The experiment is based on two identical LAr-TPCs complemented by magnetized spectrometers detecting electron and muon neutrino events at Far and Near positions, 1600 m and 300 m from the proton target, respectively. The ICARUS T600 detector, the largest LAr-TPC ever built with a size of about 600 ton of imaging mass, now running in the LNGS underground laboratory, will be moved at the CERN Far position. An additional 1/4 of the T600 detector (T150) will be constructed and located in the Near position. Two large area spectrometers will be placed downstream of the two LAr-TPC detectors to perform charge identification and muon momentum measurements from sub-GeV to several GeV energy range, greatly complementing the physics capabilities. This experiment will offer remarkable discovery potentialities, collecting a very large number of unbiased events both in the neutrino and antineutrino channels, largely adequate to definitely settle the origin of the observed neutrino-related anomalies., Comment: Contribution to the European Strategy for Particle Physics - Open Symposium Preparatory Group, Kracow 10-12 September 2012
Published: 2012

46. Search for 'anomalies' from neutrino and anti-neutrino oscillations at Delta_m^2 ~ 1eV^2 with muon spectrometers and large LAr-TPC imaging detectors

Author: Antonello, M., Bagliani, D., Baibussinov, B., Bilokon, H., Boffelli, F., Bonesini, M., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dequal, D., Dermenev, A., Dolfini, R., De Gerone, M., Dussoni, S., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Garvey, G. T., Gatti, F., Gibin, D., Gninenko, S., Guber, F., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kirsanov, M., Kisiel, J., Kochanek, I., Kurepin, A., Łagoda, J., Lucchini, G., Louis, W. C., Mania, S., Mannocchi, G., Marchini, S., Matveev, V., Menegolli, A., Meng, G., Mills, G. B., Montanari, C., Nicoletto, M., Otwinowski, S., Palczewski, T. J., Passardi, G., Perfetto, F., Picchi, P., Pietropaolo, F., Płoński, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Stefan, D., Stepaniak, J., Sulej, R., Suvorova, O., Terrani, M., Tlisov, D., Van de Water, R. G., Trinchero, G., Turcato, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zani, A., Zaremba, K., Benettoni, M., Bernardini, P., Bertolin, A., Bozza, C., Brugnera, R., Cecchetti, A., Cecchini, S., Collazuol, G., Creti, P., Corso, F. Dal, De Mitri, I., De Robertis, G., De Serio, M., Esposti, L. Degli, Di Ferdinando, D., Dore, U., Dusini, S., Fabbricatore, P., Fanin, C., Fini, R. A., Fiore, G., Garfagnini, A., Giacomelli, G., Giacomelli, R., Grelli, G., Guandalini, C., Guerzoni, M., Kose, U., Laurenti, G., Laveder, M., Lippi, I., Loddo, F., Longhin, A., Loverre, P., Mancarella, G., Mandrioli, G., Margiotta, A., Marsella, G., Mauri, N., Medinaceli, E., Mengucci, A., Mezzetto, M., Michinelli, R., Muciaccia, M. T., Orecchini, D., Paoloni, A., Pastore, A., Patrizii, L., Pozzato, M., Rescigno, R., Rosa, G., Simone, S., Sioli, M., Sirri, G., Spurio, M., Stanco, L., Stellacci, S., Surdo, A., Tenti, M., Togo, V., Ventura, M., Zago, M., Antonello, M., Bagliani, D., Baibussinov, B., Bilokon, H., Boffelli, F., Bonesini, M., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dequal, D., Dermenev, A., Dolfini, R., De Gerone, M., Dussoni, S., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Garvey, G. T., Gatti, F., Gibin, D., Gninenko, S., Guber, F., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kirsanov, M., Kisiel, J., Kochanek, I., Kurepin, A., Łagoda, J., Lucchini, G., Louis, W. C., Mania, S., Mannocchi, G., Marchini, S., Matveev, V., Menegolli, A., Meng, G., Mills, G. B., Montanari, C., Nicoletto, M., Otwinowski, S., Palczewski, T. J., Passardi, G., Perfetto, F., Picchi, P., Pietropaolo, F., Płoński, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Stefan, D., Stepaniak, J., Sulej, R., Suvorova, O., Terrani, M., Tlisov, D., Van de Water, R. G., Trinchero, G., Turcato, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zani, A., Zaremba, K., Benettoni, M., Bernardini, P., Bertolin, A., Bozza, C., Brugnera, R., Cecchetti, A., Cecchini, S., Collazuol, G., Creti, P., Corso, F. Dal, De Mitri, I., De Robertis, G., De Serio, M., Esposti, L. Degli, Di Ferdinando, D., Dore, U., Dusini, S., Fabbricatore, P., Fanin, C., Fini, R. A., Fiore, G., Garfagnini, A., Giacomelli, G., Giacomelli, R., Grelli, G., Guandalini, C., Guerzoni, M., Kose, U., Laurenti, G., Laveder, M., Lippi, I., Loddo, F., Longhin, A., Loverre, P., Mancarella, G., Mandrioli, G., Margiotta, A., Marsella, G., Mauri, N., Medinaceli, E., Mengucci, A., Mezzetto, M., Michinelli, R., Muciaccia, M. T., Orecchini, D., Paoloni, A., Pastore, A., Patrizii, L., Pozzato, M., Rescigno, R., Rosa, G., Simone, S., Sioli, M., Sirri, G., Spurio, M., Stanco, L., Stellacci, S., Surdo, A., Tenti, M., Togo, V., Ventura, M., and Zago, M.
Abstract: This proposal describes an experimental search for sterile neutrinos beyond the Standard Model with a new CERN-SPS neutrino beam. The experiment is based on two identical LAr-TPC's followed by magnetized spectrometers, observing the electron and muon neutrino events at 1600 and 300 m from the proton target. This project will exploit the ICARUS T600, moved from LNGS to the CERN "Far" position. An additional 1/4 of the T600 detector will be constructed and located in the "Near" position. Two spectrometers will be placed downstream of the two LAr-TPC detectors to greatly complement the physics capabilities. Spectrometers will exploit a classical dipole magnetic field with iron slabs, and a new concept air-magnet, to perform charge identification and muon momentum measurements in a wide energy range over a large transverse area. In the two positions, the radial and energy spectra of the nu_e beam are practically identical. Comparing the two detectors, in absence of oscillations, all cross sections and experimental biases cancel out, and the two experimentally observed event distributions must be identical. Any difference of the event distributions at the locations of the two detectors might be attributed to the possible existence of {\nu}-oscillations, presumably due to additional neutrinos with a mixing angle sin^2(2theta_new) and a larger mass difference Delta_m^2_new. The superior quality of the LAr imaging TPC, in particular its unique electron-pi_zero discrimination allows full rejection of backgrounds and offers a lossless nu_e detection capability. The determination of the muon charge with the spectrometers allows the full separation of nu_mu from anti-nu_mu and therefore controlling systematics from muon mis-identification largely at high momenta., Comment: Experiment proposal
Published: 2012

47. {\mu}{\to}e{\gamma} and {\mu}{\to}eee Status and perspectives

Author: De Gerone, M. and De Gerone, M.
Abstract: I report on the research status and the perspectives of the Lepton Flavor Violating decays {\mu}{\to}e{\gamma} and {\mu}{\to}eee. In particular, I will concentrate on the {\mu}{\to}e{\gamma} decay and the preliminary results obtained from the analysis of the 2009 data collected by the MEG experiment., Comment: Presented at The Ninth International Conference on Flavor Physics and CP Violation FPCP2011
Published: 2011

48. New limit on the lepton-flavour violating decay mu -> e gamma

Author: MEG collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kettle, P. -R., Khazin, B. I., 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, Yu. V., Zanello, D., MEG collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kettle, P. -R., Khazin, B. I., 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, Yu. V., 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 flavour violating decay mu->e gamma. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8 x 10**14 muon decays, gives a 90% C.L. upper limit of 2.4 x 10**-12 on the branching ratio of the mu->e gamma decay, constituting the most stringent limit on the existence of this decay to date., Comment: 5 pages, 2 figures, accepted for publication at Phys. Rev. Lett
Published: 2011
Full Text: View/download PDF

49. New limit on the lepton-flavour violating decay mu -> e gamma

Author: MEG collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kettle, P. -R., Khazin, B. I., 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, Yu. V., Zanello, D., MEG collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kettle, P. -R., Khazin, B. I., 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, Yu. V., 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 flavour violating decay mu->e gamma. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8 x 10**14 muon decays, gives a 90% C.L. upper limit of 2.4 x 10**-12 on the branching ratio of the mu->e gamma decay, constituting the most stringent limit on the existence of this decay to date., Comment: 5 pages, 2 figures, accepted for publication at Phys. Rev. Lett
Published: 2011
Full Text: View/download PDF

50. New limit on the lepton-flavour violating decay mu -> e gamma

Author: MEG collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kettle, P. -R., Khazin, B. I., 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, Yu. V., Zanello, D., MEG collaboration, Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., Cattaneo, P. W., 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, D. N., Haruyama, T., Hildebrandt, M., Hisamatsu, Y., Ignatov, F., Iwamoto, T., Kettle, P. -R., Khazin, B. I., 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, Yu. V., 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 flavour violating decay mu->e gamma. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8 x 10**14 muon decays, gives a 90% C.L. upper limit of 2.4 x 10**-12 on the branching ratio of the mu->e gamma decay, constituting the most stringent limit on the existence of this decay to date., Comment: 5 pages, 2 figures, accepted for publication at Phys. Rev. Lett
Published: 2011
Full Text: View/download PDF

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