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629 results on '"Wulzer, A."'

1. Why detect forward muons at a muon collider

Author

Ruhdorfer, Maximilian, Salvioni, Ennio, and Wulzer, Andrea

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

We survey the opportunities offered by the detection of the forward muons that accompany the creation of neutral effective vector bosons at a muon collider, in different kinematic regimes. Vectors with relatively low energy produce the Higgs boson and the extended muon angular coverage enables studies of the Higgs properties, such as the measurement of the inclusive production cross section and of the branching ratio to invisible final states. New heavy particles could be produced by vectors of higher energy, through Higgs portal interactions. If the new particles are invisible, the detection of the forward muons is essential in order to search for this scenario. The angular correlations of the forward muons are sensitive to the quantum interference between the vector boson helicity amplitudes and can be exploited for the characterisation of vector boson scattering and fusion processes. This is illustrated by analysing the CP properties of the Higgs coupling to the Z boson. Our findings provide a physics case and a set of benchmarks for the design of a dedicated forward muon detector., Comment: 23 pages, 9 figures, 7 tables

Published
2024

2. Interim report for the International Muon Collider Collaboration (IMCC)

Author

Accettura, C., Adrian, S., Agarwal, R., Ahdida, C., Aimé, C., Aksoy, A., Alberghi, G. L., Alden, S., Amapane, N., Amorim, D., Andreetto, P., Anulli, F., Appleby, R., Apresyan, A., Asadi, P., Mahmoud, M. Attia, Auchmann, B., Back, J., Badea, A., Bae, K. J., Bahng, E. J., Balconi, L., Balli, F., Bandiera, L., Barbagallo, C., Barlow, R., Bartoli, C., Bartosik, N., Barzi, E., Batsch, F., Bauce, M., Begel, M., Berg, J. S., Bersani, A., Bertarelli, A., Bertinelli, F., Bertolin, A., Bhat, P., Bianchi, C., Bianco, M., Bishop, W., Black, K., Boattini, F., Bogacz, A., Bonesini, M., Bordini, B., de Sousa, P. Borges, Bottaro, S., Bottura, L., Boyd, S., Breschi, M., Broggi, F., Brunoldi, M., Buffat, X., Buonincontri, L., Burrows, P. N., Burt, G. C., Buttazzo, D., Caiffi, B., Calatroni, S., Calviani, M., Calzaferri, S., Calzolari, D., Cantone, C., Capdevilla, R., Carli, C., Carrelli, C., Casaburo, F., Casarsa, M., Castelli, L., Catanesi, M. G., Cavallucci, L., Cavoto, G., Celiberto, F. G., Celona, L., Cemmi, A., Ceravolo, S., Cerri, A., Cerutti, F., Cesarini, G., Cesarotti, C., Chancé, A., Charitonidis, N., Chiesa, M., Chiggiato, P., Ciccarella, V. L., Puviani, P. Cioli, Colaleo, A., Colao, F., Collamati, F., Costa, M., Craig, N., Curtin, D., D'Angelo, L., Da Molin, G., Damerau, H., Dasu, S., de Blas, J., De Curtis, S., De Gersem, H., Del Moro, T., Delahaye, J. -P., Denisov, D., Denizli, H., Dermisek, R., Valdor, P. Desiré, Desponds, C., Di Luzio, L., Di Meco, E., Di Petrillo, K. F., Di Sarcina, I., Diociaiuti, E., Dorigo, T., Dreimanis, K., Pree, T. du, Edgecock, T., Fabbri, S., Fabbrichesi, M., Farinon, S., Ferrand, G., Somoza, J. A. Ferreira, Fieg, M., Filthaut, F., Fox, P., Franceschini, R., Ximenes, R. Franqueira, Gallinaro, M., Garcia-Sciveres, M., Garcia-Tabares, L., Gargiulo, R., Garion, C., Garzelli, M. V., Gast, M., Gerber, C. E., Giambastiani, L., Gianelle, A., Gianfelice-Wendt, E., Gibson, S., Gilardoni, S., Giove, D. A., Giovinco, V., Giraldin, C., Glioti, A., Gorzawski, A., Greco, M., Grojean, C., Grudiev, A., Gschwendtner, E., Gueli, E., Guilhaudin, N., Han, C., Han, T., Hauptman, J. M., Herndon, M., Hillier, A. D., Hillman, M., Holmes, T. R., Homiller, S., Jana, S., Jindariani, S., Johannesson, S., Johnson, B., Jones, O. R., Jurj, P. -B., Kahn, Y., Kamath, R., Kario, A., Karpov, I., Kelliher, D., Kilian, W., Kitano, R., Kling, F., Kolehmainen, A., Kong, K. C., Kosse, J., Krintiras, G., Krizka, K., Kumar, N., Kvikne, E., Kyle, R., Laface, E., Lane, K., Latina, A., Lechner, A., Lee, J., Lee, L., Lee, S. W., Lefevre, T., Leonardi, E., Lerner, G., Li, P., Li, Q., Li, T., Li, W., Voti, R. Li, Lindroos, M., Lipton, R., Liu, D., Liu, M., Liu, Z., Lombardi, A., Lomte, S., Long, K., Longo, L., Lorenzo, J., Losito, R., Low, I., Lu, X., Lucchesi, D., Luo, T., Lupato, A., Métral, E., Mękała, K., Ma, Y., Mańczak, J. M., Machida, S., Madlener, T., Magaletti, L., Maggi, M., Durand, H. Mainaud, Maltoni, F., Mandurrino, M., Marchand, C., Mariani, F., Marin, S., Mariotto, S., Martin-Haugh, S., Masullo, M. R., Mauro, G. S., Mazzolari, A., Mele, B., Meloni, F., Meng, X., Mentink, M., Miceli, R., Milas, N., Mohammadi, A., Moll, D., Montella, A., Morandin, M., Morrone, M., Mulder, T., Musenich, R., Nardecchia, M., Nardi, F., Neuffer, D., Newbold, D., Novelli, D., Olvegård, M., Onel, Y., Orestano, D., Osborne, J., Otten, S., Torres, Y. M. Oviedo, Paesani, D., Griso, S. Pagan, Pagani, D., Pal, K., Palmer, M., Pampaloni, A., Panci, P., Pani, P., Papaphilippou, Y., Paparella, R., Paradisi, P., Passeri, A., Pastrone, N., Pellecchia, A., Piccinini, F., Piekarz, H., Pieloni, T., Plouin, J., Portone, A., Potamianos, K., Potdevin, J., Prestemon, S., Puig, T., Qiang, J., Quettier, L., Rabemananjara, T. R., Radicioni, E., Radogna, R., Rago, I. C., Ratkus, A., Resseguie, E., Reuter, J., Ribani, P. L., Riccardi, C., Ricciardi, S., Robens, T., Robert, Y., Roger, C., Rojo, J., Romagnoni, M., Ronald, K., Rosser, B., Rossi, C., Rossi, L., Rozanov, L., Ruhdorfer, M., Ruiz, R., Queiroz, F. S., Saini, S., Sala, F., Salierno, C., Salmi, T., Salvini, P., Salvioni, E., Sammut, N., Santini, C., Saputi, A., Sarra, I., Scarantino, G., Schneider-Muntau, H., Schulte, D., Scifo, J., Sen, T., Senatore, C., Senol, A., Sertore, D., Sestini, L., Rêgo, R. C. Silva, Simone, F. M., Skoufaris, K., Sorbello, G., Sorbi, M., Sorti, S., Soubirou, L., Spataro, D., Stamerra, A., Stapnes, S., Stark, G., Statera, M., Stechauner, B. M., Su, S., Su, W., Sun, X., Sytov, A., Tang, J., Taylor, R., Kate, H. Ten, Testoni, P., Thiele, L. S., Garcia, R. Tomas, Mugglestone, M. Topp, Torims, T., Torre, R., Tortora, L. T., Trifinopoulos, S., Udongwo, S. -A., Vai, I., Valente, R. U., van Rienen, U., van Weelderen, R., Vanwelde, M., Velev, G., Venditti, R., Vendrasco, A., Verna, A., Verweij, A., Verwilligen, P., Villamzar, Y., Vittorio, L., Vitulo, P., Vojskovic, I., Wang, D., Wang, L. -T., Wang, X., Wendt, M., Widorski, M., Wozniak, M., Wu, Y., Wulzer, A., Xie, K., Yang, Y., Yap, Y. C., Yonehara, K., Yoo, H. D., You, Z., Zanetti, M., Zaza, A., Zhang, L., Zhu, R., Zlobin, A., Zuliani, D., and Zurita, J. F.

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

The International Muon Collider Collaboration (IMCC) [1] was established in 2020 following the recommendations of the European Strategy for Particle Physics (ESPP) and the implementation of the European Strategy for Particle Physics-Accelerator R&D Roadmap by the Laboratory Directors Group [2], hereinafter referred to as the the European LDG roadmap. The Muon Collider Study (MuC) covers the accelerator complex, detectors and physics for a future muon collider. In 2023, European Commission support was obtained for a design study of a muon collider (MuCol) [3]. This project started on 1st March 2023, with work-packages aligned with the overall muon collider studies. In preparation of and during the 2021-22 U.S. Snowmass process, the muon collider project parameters, technical studies and physics performance studies were performed and presented in great detail. Recently, the P5 panel [4] in the U.S. recommended a muon collider R&D, proposed to join the IMCC and envisages that the U.S. should prepare to host a muon collider, calling this their "muon shot". In the past, the U.S. Muon Accelerator Programme (MAP) [5] has been instrumental in studies of concepts and technologies for a muon collider., Comment: This document summarises the International Muon Collider Collaboration (IMCC) progress and status of the Muon Collider R&D programme

Published
2024

3. Low-virtuality splitting in the Standard Model

Author

Nardi, Filippo, Ricci, Lorenzo, and Wulzer, Andrea

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

When the available collision energy is much above the mass of the particles involved, scattering amplitudes feature kinematic configurations that are enhanced by the much lower virtuality of some intermediate particle. Such configurations generally factorise in terms of a hard scattering amplitude with exactly on-shell intermediate particle, times universal factors. In the case of real radiation emission, such factors are splitting amplitudes that describe the creation or the annihilation -- for initial or final state splittings -- of the low-virtuality particle and the creation of the real radiation particles. We compute at tree-level the amplitudes describing all the splittings that take place in the Standard Model when the collision energy is much above the electroweak scale. Unlike previous results, our splitting amplitudes fully describe the low-virtuality kinematic regime, which includes the region of collinear splitting, of soft emission, and combinations thereof. The splitting amplitudes are compactly represented as little-group tensors in an improved bi-spinor formalism for massive spin-1 particles that automatically incorporates the Goldstone Boson Equivalence Theorem. Simple explicit expressions are obtained using a suitably defined infinite-momentum helicity basis representation of the spinor variables. Our results, combined with the known virtual contributions, could enable systematic predictions of the leading electroweak radiation effects in high-energy scattering processes, with particularly promising phenomenological applications to the physics of future colliders with very high energy such as a muon collider., Comment: 45 pages, 4 figures

Published
2024

4. Low-virtuality splitting in the Standard Model

Author

Filippo Nardi, Lorenzo Ricci, and Andrea Wulzer

Subjects
Higgs Properties, Higher Order Electroweak Calculations, Factorization, Renormalization Group, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract When the available collision energy is much above the mass of the particles involved, scattering amplitudes feature kinematic configurations that are enhanced by the much lower virtuality of some intermediate particle. Such configurations generally factorise in terms of a hard scattering amplitude with exactly on-shell intermediate particle, times universal factors. In the case of real radiation emission, such factors are splitting amplitudes that describe the creation or the annihilation — for initial or final state splittings — of the low-virtuality particle and the creation of the real radiation particles. We compute at tree-level the amplitudes describing all the splittings that take place in the Standard Model when the collision energy is much above the electroweak scale. Unlike previous results, our splitting amplitudes fully describe the low-virtuality kinematic regime, which includes the region of collinear splitting, of soft emission, and combinations thereof. The splitting amplitudes are compactly represented as little-group tensors in an improved bi-spinor formalism for massive spin-1 particles that automatically incorporates the Goldstone Boson Equivalence Theorem. Simple explicit expressions are obtained using a suitably defined infinite-momentum helicity basis representation of the spinor variables. Our results, combined with the known virtual contributions, could enable systematic predictions of the leading electroweak radiation effects in high-energy scattering processes, with particularly promising phenomenological applications to the physics of future colliders with very high energy such as a muon collider.

Published
2024
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5. Boosting likelihood learning with event reweighting

Author

Chen, Siyu, Glioti, Alfredo, Panico, Giuliano, and Wulzer, Andrea

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

Extracting maximal information from experimental data requires access to the likelihood function, which however is never directly available for complex experiments like those performed at high energy colliders. Theoretical predictions are obtained in this context by Monte Carlo events, which do furnish an accurate but abstract and implicit representation of the likelihood. Strategies based on statistical learning are currently being developed to infer the likelihood function explicitly by training a continuous-output classifier on Monte Carlo events. In this paper, we investigate the usage of Monte Carlo events that incorporate the dependence on the parameters of interest by reweighting. This enables more accurate likelihood learning with less training data and a more robust learning scheme that is more suited for automation and extensive deployment. We illustrate these advantages in the context of LHC precision probes of new Effective Field Theory interactions., Comment: 51 pages, 13 figures

Published
2023

6. Goodness of fit by Neyman-Pearson testing

Author

Grosso, Gaia, Letizia, Marco, Pierini, Maurizio, and Wulzer, Andrea

Subjects
High Energy Physics - Phenomenology, Statistics - Machine Learning
Abstract

The Neyman-Pearson strategy for hypothesis testing can be employed for goodness of fit if the alternative hypothesis is selected from data by exploring a rich parametrised family of models, while controlling the impact of statistical fluctuations. The New Physics Learning Machine (NPLM) methodology has been developed as a concrete implementation of this idea, to target the detection of new physical effects in the context of high energy physics collider experiments. In this paper we conduct a comparison of this approach to goodness of fit with others, in particular with classifier-based strategies that share strong similarities with NPLM. From our comparison, NPLM emerges as the more sensitive test to small departures of the data from the expected distribution and not biased towards detecting specific types of anomalies. These features make it suited for agnostic searches for new physics at collider experiments. Its deployment in other scientific and industrial scenarios should be investigated., Comment: 38 pages; improved presentation and writing throughout the paper

Published
2023
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7. Invisible Higgs from forward muons at a muon collider

Author

Ruhdorfer, Maximilian, Salvioni, Ennio, and Wulzer, Andrea

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

We propose to probe the Higgs boson decay to invisible particles at a muon collider by observing the forward muons that are produced in association with the Higgs in the Z-boson fusion channel. An excellent sensitivity is possible in line of principle, owing to the large number of produced Higgs bosons, provided a forward muon detector is installed. We find that the resolution on the measurement of the muon energy and angle will be the main factor limiting the actual sensitivity. This poses tight requirements on the forward muon detector design., Comment: 11 pages, 9 figures, 2 tables

Published
2023
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8. Towards a Muon Collider

Author

Accettura, Carlotta, Adams, Dean, Agarwal, Rohit, Ahdida, Claudia, Aimè, Chiara, Amapane, Nicola, Amorim, David, Andreetto, Paolo, Anulli, Fabio, Appleby, Robert, Apresyan, Artur, Apyan, Aram, Arsenyev, Sergey, Asadi, Pouya, Mahmoud, Mohammed Attia, Azatov, Aleksandr, Back, John, Balconi, Lorenzo, Bandiera, Laura, Barlow, Roger, Bartosik, Nazar, Barzi, Emanuela, Batsch, Fabian, Bauce, Matteo, Berg, J. Scott, Bersani, Andrea, Bertarelli, Alessandro, Bertolin, Alessandro, Boattini, Fulvio, Bogacz, Alex, Bonesini, Maurizio, Bordini, Bernardo, Bottaro, Salvatore, Bottura, Luca, Braghieri, Alessandro, Breschi, Marco, Bruhwiler, Natalie, Buffat, Xavier, Buonincontri, Laura, Burrows, Philip, Burt, Graeme, Buttazzo, Dario, Caiffi, Barbara, Calviani, Marco, Calzaferri, Simone, Calzolari, Daniele, Capdevilla, Rodolfo, Carli, Christian, Casaburo, Fausto, Casarsa, Massimo, Castelli, Luca, Catanesi, Maria Gabriella, Cavoto, Gianluca, Celiberto, Francesco Giovanni, Celona, Luigi, Cerri, Alessandro, Cesarini, Gianmario, Cesarotti, Cari, Chachamis, Grigorios, Chance, Antoine, Chen, Siyu, Chien, Yang-Ting, Chiesa, Mauro, Colaleo, Anna, Collamati, Francesco, Collazuol, Gianmaria, Costa, Marco, Craig, Nathaniel, Curatolo, Camilla, Curtin, David, Da Molin, Giacomo, Dam, Magnus, Damerau, Heiko, Dasu, Sridhara, de Blas, Jorge, De Curtis, Stefania, De Matteis, Ernesto, De Rosa, Stefania, Delahaye, Jean-Pierre, Denisov, Dmitri, Denizli, Haluk, Densham, Christopher, Dermisek, Radovan, Di Luzio, Luca, Di Meco, Elisa, Di Micco, Biagio, Dienes, Keith, Diociaiuti, Eleonora, Dorigo, Tommaso, Dudarev, Alexey, Edgecock, Robert, Errico, Filippo, Fabbrichesi, Marco, Farinon, Stefania, Ferrari, Anna, Somoza, Jose Antonio Ferreira, Filthaut, Frank, Fiorina, Davide, Fol, Elena, Forslund, Matthew, Franceschini, Roberto, Ximenes, Rui Franqueira, Gabrielli, Emidio, Gallinaro, Michele, Garosi, Francesco, Giambastiani, Luca, Gianelle, Alessio, Gilardoni, Simone, Giove, Dario Augusto, Giraldin, Carlo, Glioti, Alfredo, Greco, Mario, Greljo, Admir, Groeber, Ramona, Grojean, Christophe, Grudiev, Alexej, Gu, Jiayin, Han, Chengcheng, Han, Tao, Hauptman, John, Henning, Brian, Hermanek, Keith, Herndon, Matthew, Holmes, Tova Ray, Homiller, Samuel, Huang, Guoyuan, Jana, Sudip, Jindariani, Sergo, Kahn, Yonatan, Karpov, Ivan, Kelliher, David, Kilian, Wolfgang, Kolehmainen, Antti, Kong, Kyoungchul, Koppenburg, Patrick, Kreher, Nils, Krintiras, Georgios, Krizka, Karol, Krnjaic, Gordan, Kumar, Nilanjana, Lechner, Anton, Lee, Lawrence, Li, Qiang, Voti, Roberto Li, Lipton, Ronald, Liu, Zhen, Lomte, Shivani, Long, Kenneth, Gomez, Jose Lorenzo, Losito, Roberto, Low, Ian, Lu, Qianshu, Lucchesi, Donatella, Ma, Lianliang, Ma, Yang, Machida, Shinji, Maltoni, Fabio, Mandurrino, Marco, Mansoulie, Bruno, Mantani, Luca, Marchand, Claude, Mariotto, Samuele, Martin-Haugh, Stewart, Marzocca, David, Mastrapasqua, Paola, Mauro, Giorgio, Mazzolari, Andrea, McGinnis, Navin, Meade, Patrick, Mele, Barbara, Meloni, Federico, Mentink, Matthias, Merlassino, Claudia, Metral, Elias, Miceli, Rebecca, Milas, Natalia, Mokhov, Nikolai, Montella, Alessandro, Mulder, Tim, Musenich, Riccardo, Nardecchia, Marco, Nardi, Federico, Neufeld, Niko, Neuffer, David, Onel, Yasar, Orestano, Domizia, Paesani, Daniele, Griso, Simone Pagan, Palmer, Mark, Panci, Paolo, Panico, Giuliano, Paparella, Rocco, Paradisi, Paride, Passeri, Antonio, Pastrone, Nadia, Pellecchia, Antonello, Piccinini, Fulvio, Portone, Alfredo, Potamianos, Karolos, Prioli, Marco, Quettier, Lionel, Radicioni, Emilio, Radogna, Raffaella, Rattazzi, Riccardo, Redigolo, Diego, Reina, Laura, Resseguie, Elodie, Reuter, Jürgen, Ribani, Pier Luigi, Riccardi, Cristina, Ricci, Lorenzo, Ricciardi, Stefania, Ristori, Luciano, Robens, Tania Natalie, Rodejohann, Werner, Rogers, Chris, Romagnoni, Marco, Ronald, Kevin, Rossi, Lucio, Ruiz, Richard, Queiroz, Farinaldo S., Sala, Filippo, Sala, Paola, Salko, Jakub, Salvini, Paola, Salvioni, Ennio, Santiago, Jose, Sarra, Ivano, Esteban, Francisco Javier Saura, Schieck, Jochen, Schulte, Daniel, Selvaggi, Michele, Senatore, Carmine, Senol, Abdulkadir, Sertore, Daniele, Sestini, Lorenzo, Sharma, Varun, Shiltsev, Vladimir, Shu, Jing, Simone, Federica Maria, Simoniello, Rosa, Skoufaris, Kyriacos, Sorbi, Massimo, Sorti, Stefano, Stamerra, Anna, Stapnes, Steinar, Stark, Giordon Holtsberg, Statera, Marco, Stechauner, Bernd, Stolarski, Daniel, Stratakis, Diktys, Su, Shufang, Su, Wei, Sumensari, Olcyr, Sun, Xiaohu, Sundrum, Raman, Swiatlowski, Maximilian J, Sytov, Alexei, Kuchma, Benjamin T., Tait, Tim M. P., Tang, Jian, Tang, Jingyu, Tesi, Andrea, Testoni, Pietro, Thomas, Brooks, Thompson, Emily Anne, Torre, Riccardo, Tortora, Ludovico, Tortora, Luca, Trifinopoulos, Sokratis, Vai, Ilaria, Valente, Riccardo, Valente, Riccardo Umberto, Valente, Marco, Valenti, Alessandro, Valle, Nicolò, van Rienen, Ursula, Venditti, Rosamaria, Verweij, Arjan, Verwilligen, Piet, Vittorio, Ludovico, Vitulo, Paolo, Wang, Liantao, Weber, Hannsjorg, Wozniak, Mariusz, Wu, Richard, Wu, Yongcheng, Wulzer, Andrea, Xie, Keping, Yamamoto, Akira, Yang, Yifeng, Yonehara, Katsuya, Zaza, Angela, Zhao, Xiaoran, Zlobin, Alexander, Zuliani, Davide, and Zurita, Jose

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

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10~TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work., Comment: 118 pages, 103 figures

Published
2023

9. Fast kernel methods for Data Quality Monitoring as a goodness-of-fit test

Author

Grosso, Gaia, Lai, Nicolò, Letizia, Marco, Pazzini, Jacopo, Rando, Marco, Rosasco, Lorenzo, Wulzer, Andrea, and Zanetti, Marco

Subjects
High Energy Physics - Experiment, Computer Science - Machine Learning
Abstract

We here propose a machine learning approach for monitoring particle detectors in real-time. The goal is to assess the compatibility of incoming experimental data with a reference dataset, characterising the data behaviour under normal circumstances, via a likelihood-ratio hypothesis test. The model is based on a modern implementation of kernel methods, nonparametric algorithms that can learn any continuous function given enough data. The resulting approach is efficient and agnostic to the type of anomaly that may be present in the data. Our study demonstrates the effectiveness of this strategy on multivariate data from drift tube chamber muon detectors., Comment: 16 pages, 7 figures

Published
2023

10. A fast and flexible machine learning approach to data quality monitoring

Author

Grosso, Gaia, Lai, Nicolò, Letizia, Marco, Pazzini, Jacopo, Rando, Marco, Wulzer, Andrea, and Zanetti, Marco

Subjects
High Energy Physics - Experiment
Abstract

We present a machine learning based approach for real-time monitoring of particle detectors. The proposed strategy evaluates the compatibility between incoming batches of experimental data and a reference sample representing the data behavior in normal conditions by implementing a likelihood-ratio hypothesis test. The core model is powered by recent large-scale implementations of kernel methods, nonparametric learning algorithms that can approximate any continuous function given enough data. The resulting algorithm is fast, efficient and agnostic about the type of potential anomaly in the data. We show the performance of the model on multivariate data from a drift tube chambers muon detector., Comment: Accepted at the NeurIPS 2022 workshop: Machine Learning and the Physical Sciences. Full version at arXiv:2303.05413

Published
2023

11. Muon Collider Forum Report

Author

Black, K. M., Jindariani, S., Li, D., Maltoni, F., Meade, P., Stratakis, D., Acosta, D., Agarwal, R., Agashe, K., Aime, C., Ally, D., Apresyan, A., Apyan, A., Asadi, P., Athanasakos, D., Bao, Y., Barzi, E., Bartosik, N., Bauerdick, L. A. T., Beacham, J., Belomestnykh, S., Berg, J. S., Berryhill, J., Bertolin, A., Bhat, P. C., Biagini, M. E., Bloom, K., Bose, T., Bross, A., Brost, E., Bruhwiler, N., Buonincontri, L., Buttazzo, D., Candelise, V., Canepa, A., Carpenter, L., Casarsa, M., Celiberto, F., Cesarotti, C., Chachamis, G., Chacko, Z., Chang, P., Chekanov, S. V., Chen, T. Y., Chiesa, M., Cohen, T., Costa, M., Craig, N., Crivellin, A., Curatolo, C., Curtin, D., Da Molin, G., Dasu, S., de Gouvea, A., Denisov, D., Dermisek, R., Di Petrillo, K. F., Dorigo, T., Duarte, J. M., Elvira, V. D., Essig, R., Everaerts, P., Fan, J., Felcini, M., Fiore, G., Fiorina, D., Forslund, M., Franceschini, R., Garzelli, M. V., Gerber, C. E., Giambastiani, L., Giove, D., Guiducci, S., Han, T., Hermanek, K., Herwig, C., Hirschauer, J., Holmes, T. R., Homiller, S., Horyn, L. A., Ivanov, A., Jayatilaka, B., Jia, H., Jung, C. K., Kahn, Y., Kaplan, D. M., Kaur, M., Kawale, M., Koppenburg, P., Krintiras, G., Krizka, K., Kuchma, B., Lee, L., Li, L., Li, P., Li, Q., Li, W., Lipton, R., Liu, Z., Lomte, S., Lu, Q., Lucchesi, D., Luo, T., Lyu, K., Ma, Y., Machado, P. A. N., Madrid, C., Mahon, D. J., Mazzacane, A., McGinnis, N., McLean, C., Mele, B., Meloni, F., Middleton, S. C., Mishra, R. K., Mokhov, N., Montella, A., Morandin, M., Nagaitsev, S., Nardi, F., Neubauer, M. S., Neuffer, D. V., Newman, H., Ogaz, R., Ojalvo, I., Oksuzian, I., Orimoto, T., Ozek, B., Pachal, K., Griso, S. Pagan, Panci, P., Papadimitriou, V., Pastrone, N., Pedro, K., Pellemoine, F., Perloff, A., Pinna, D., Piccinini, F., Pleier, Marc-Andre, Posen, S., Potamianos, K., Rappoccio, S., Reece, M., Reina, L., Hall, A. Reinsvold, Riccardi, C., Ristori, L., Robens, T., Ruiz, R., Sala, P., Schulte, D., Sestini, L., Shiltsev, V., Snopok, P., Stark, G., Stupak III, J., Su, S ., Sundrum, R., Swiatlowski, M., Syphers, M. J., Taffard, A., Thompson, W., Torun, Y., Tully, C. G., Vai, I., Valente, M., van Rienen, U., van Weelderen, R., Velev, G., Venkatasubramanian, N., Vittorio, L., Vuosalo, C., Wang, X., Weber, H., Wu, R., Wu, Y., Wulzer, A., Xie, K., Xie, S., Yohay, R., Yonehara, K., Yu, F., Zlobin, A. V., Zuliani, D., and Zurita, J.

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

A multi-TeV muon collider offers a spectacular opportunity in the direct exploration of the energy frontier. Offering a combination of unprecedented energy collisions in a comparatively clean leptonic environment, a high energy muon collider has the unique potential to provide both precision measurements and the highest energy reach in one machine that cannot be paralleled by any currently available technology. The topic generated a lot of excitement in Snowmass meetings and continues to attract a large number of supporters, including many from the early career community. In light of this very strong interest within the US particle physics community, Snowmass Energy, Theory and Accelerator Frontiers created a cross-frontier Muon Collider Forum in November of 2020. The Forum has been meeting on a monthly basis and organized several topical workshops dedicated to physics, accelerator technology, and detector R&D. Findings of the Forum are summarized in this report.

Published
2022

12. Boosting likelihood learning with event reweighting

Author

Siyu Chen, Alfredo Glioti, Giuliano Panico, and Andrea Wulzer

Subjects
Electroweak Precision Physics, SMEFT, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Extracting maximal information from experimental data requires access to the likelihood function, which however is never directly available for complex experiments like those performed at high energy colliders. Theoretical predictions are obtained in this context by Monte Carlo events, which do furnish an accurate but abstract and implicit representation of the likelihood. Strategies based on statistical learning are currently being developed to infer the likelihood function explicitly by training a continuous-output classifier on Monte Carlo events. In this paper, we investigate the usage of Monte Carlo events that incorporate the dependence on the parameters of interest by reweighting. This enables more accurate likelihood learning with less training data and a more robust learning scheme that is more suited for automation and extensive deployment. We illustrate these advantages in the context of LHC precision probes of new Effective Field Theory interactions.

Published
2024
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14. Learning new physics efficiently with nonparametric methods

Author

Letizia, Marco, Losapio, Gianvito, Rando, Marco, Grosso, Gaia, Wulzer, Andrea, Pierini, Maurizio, Zanetti, Marco, and Rosasco, Lorenzo

Subjects
High Energy Physics - Phenomenology, Computer Science - Machine Learning, High Energy Physics - Experiment
Abstract

We present a machine learning approach for model-independent new physics searches. The corresponding algorithm is powered by recent large-scale implementations of kernel methods, nonparametric learning algorithms that can approximate any continuous function given enough data. Based on the original proposal by D'Agnolo and Wulzer (arXiv:1806.02350), the model evaluates the compatibility between experimental data and a reference model, by implementing a hypothesis testing procedure based on the likelihood ratio. Model-independence is enforced by avoiding any prior assumption about the presence or shape of new physics components in the measurements. We show that our approach has dramatic advantages compared to neural network implementations in terms of training times and computational resources, while maintaining comparable performances. In particular, we conduct our tests on higher dimensional datasets, a step forward with respect to previous studies., Comment: 22 pages, 13 figures

Published
2022
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15. The collider landscape: which collider for establishing the SM instability?

Author

Franceschini, Roberto, Strumia, Alessandro, and Wulzer, Andrea

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

Capabilities of future colliders are usually discussed assuming specific hypothetical new physics. We consider the opposite possibility: that no new physics is accessible, and we want to learn if the unnatural Standard Model is part of a vast landscape. We argue that a main step in this direction would be establishing the possible instability scale of the Higgs potential. This primarily needs reducing the uncertainty on the strong coupling and on the top quark mass. We show that the top quark mass can be measured well enough via a $t \bar t$ threshold scan with low $10^{33}\,{\rm cm}^{-2}{\rm sec}^{-1}$ luminosity, that seems achievable at a `small' $e^+ e^-$ collider in the LEP tunnel, or at the first low-energy stage of a muon collider., Comment: 25 pages, 7 figures

Published
2022
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16. The physics case of a 3 TeV muon collider stage

Author

De Blas, Jorge, Buttazzo, Dario, Capdevilla, Rodolfo, Curtin, David, Franceschini, Roberto, Maltoni, Fabio, Meade, Patrick, Meloni, Federico, Su, Shufang, Vryonidou, Eleni, Wulzer, Andrea, Aimè, Chiara, Apyan, Aram, Asadi, Pouya, Mahmoud, Mohammed Attia, Azatov, Aleksandr, Bartosik, Nazar, Bertolin, Alessandro, Bottaro, Salvatore, Buonincontri, Laura, Casarsa, Massimo, Castelli, Luca, Catanesi, Maria Gabriella, Celiberto, Francesco Giovanni, Cerri, Alessandro, Cesarotti, Cari, Chachamis, Grigorios, Chen, Siyu, Chien, Yang-Ting, Chiesa, Mauro, Costa, Marco, Da Molin, Giacomo, Dasu, Sridhara, Denisov, Dmitri, Denizli, Haluk, Dermisek, Radovan, Di Luzio, Luca, Di Micco, Biagio, Dienes, Keith, Dorigo, Tommaso, Fabbrichesi, Marco, Fiorina, Davide, Forslund, Matthew, Gabrielli, Emidio, Garosi, Francesco, Glioti, Alfredo, Greco, Mario, Greljo, Admir, Groeber, Ramona, Grojean, Christophe, Gu, Jiayin, Han, Chengcheng, Han, Tao, Hermanek, Keith, Herndon, Matthew, Holmes, Tova Ray, Homiller, Samuel, Huang, Guoyuan, Jana, Sudip, Jindariani, Sergo, Kahn, Yonatan, Kilian, Wolfgang, Koppenburg, Patrick, Kreher, Nils, Krizka, Karol, Krnjaic, Gordan, Kumar, Nilanjana, Lee, Lawrence, Li, Qiang, Liu, Zhen, Long, Kenneth, Low, Ian, Lu, Qianshu, Lucchesi, Donatella, Ma, Lianliang, Ma, Yang, Mantani, Luca, Marzocca, David, McGinnis, Navin, Mele, Barbara, Merlassino, Claudia, Montella, Alessandro, Nardecchia, Marco, Nardi, Federico, Panci, Paolo, Griso, Simone Pagan, Panico, Giuliano, Paradisi, Paride, Pastrone, Nadia, Piccinini, Fulvio, Potamianos, Karolos, Radicioni, Emilio, Rattazzi, Riccardo, Redigolo, Diego, Reina, Laura, Reuter, Jürgen, Riccardi, Cristina, Ricci, Lorenzo, Ristori, Luciano, Robens, Tania Natalie, Rodejohann, Werner, Ruiz, Richard, Queiroz, Farinaldo S., Sala, Filippo, Salko, Jakub, Salvini, Paola, Santiago, Jose, Sarra, Ivano, Schulte, Daniel, Selvaggi, Michele, Senol, Abdulkadir, Sestini, Lorenzo, Sharma, Varun, Simoniello, Rosa, Stark, Giordon Holtsberg, Stolarski, Daniel, Su, Wei, Sumensari, Olcyr, Sun, Xiaohu, Tait, Tim M. P., Tang, Jian, Tesi, Andrea, Thomas, Brooks, Thompson, Emily Anne, Torre, Riccardo, Trifinopoulos, Sokratis, Vai, Ilaria, Valenti, Alessandro, Vittorio, Ludovico, Wang, Liantao, Wu, Yongcheng, Xie, Keping, Zhao, Xiaoran, and Zurita, Jose

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

In the path towards a muon collider with center of mass energy of 10 TeV or more, a stage at 3 TeV emerges as an appealing option. Reviewing the physics potential of such muon collider is the main purpose of this document. In order to outline the progression of the physics performances across the stages, a few sensitivity projections for higher energy are also presented. There are many opportunities for probing new physics at a 3 TeV muon collider. Some of them are in common with the extensively documented physics case of the CLIC 3 TeV energy stage, and include measuring the Higgs trilinear coupling and testing the possible composite nature of the Higgs boson and of the top quark at the 20 TeV scale. Other opportunities are unique of a 3 TeV muon collider, and stem from the fact that muons are collided rather than electrons. This is exemplified by studying the potential to explore the microscopic origin of the current $g$-2 and $B$-physics anomalies, which are both related with muons., Comment: 73 pages, 28 figures; Contribution to Snowmass 2021

Published
2022

17. Muon Collider Physics Summary

Author

Aimè, Chiara, Apyan, Aram, Mahmoud, Mohammed Attia, Bartosik, Nazar, Bertolin, Alessandro, Bonesini, Maurizio, Bottaro, Salvatore, Buttazzo, Dario, Capdevilla, Rodolfo, Casarsa, Massimo, Castelli, Luca, Catanesi, Maria Gabriella, Celiberto, Francesco Giovanni, Cerri, Alessandro, Cesarotti, Cari, Chachamis, Grigorios, Chen, Siyu, Chien, Yang-Ting, Chiesa, Mauro, Collazuol, Gianmaria, Costa, Marco, Craig, Nathaniel, Curtin, David, Dasu, Sridhara, De Blas, Jorge, Denisov, Dmitri, Denizli, Haluk, Dermisek, Radovan, Di Luzio, Luca, Di Micco, Biagio, Dienes, Keith, Dorigo, Tommaso, Ferrari, Anna, Fiorina, Davide, Franceschini, Roberto, Garosi, Francesco, Glioti, Alfredo, Greco, Mario, Greljo, Admir, Groeber, Ramona, Grojean, Christophe, Gu, Jiayin, Han, Tao, Henning, Brian, Hermanek, Keith, Holmes, Tova Ray, Homiller, Samuel, Jana, Sudip, Jindariani, Sergo, Kahn, Yonatan, Karpov, Ivan, Kilian, Wolfgang, Kong, Kyoungchul, Koppenburg, Patrick, Krizka, Karol, Lee, Lawrence, Li, Qiang, Lipton, Ronald, Liu, Zhen, Long, Kenneth, Low, Ian, Lucchesi, Donatella, Ma, Yang, Ma, Lianliang, Maltoni, Fabio, Mansoulie, Bruno, Mantani, Luca, Marzocca, David, McGinnis, Navin, Mele, Barbara, Meloni, Federico, Merlassino, Claudia, Montella, Alessandro, Nardecchia, Marco, Nardi, Federico, Panci, Paolo, Griso, Simone Pagan, Panico, Giuliano, Paparella, Rocco, Paradisi, Paride, Pastrone, Nadia, Piccinini, Fulvio, Potamianos, Karolos, Radicioni, Emilio, Rattazzi, Riccardo, Redigolo, Diego, Reina, Laura, Reuter, Jürgen, Riccardi, Cristina, Ricci, Lorenzo, van Rienen, Ursula, Ristori, Luciano, Robens, Tania Natalie, Ruiz, Richard, Sala, Filippo, Salko, Jakub, Salvini, Paola, Salvioni, Ennio, Schulte, Daniel, Selvaggi, Michele, Senol, Abdulkadir, Sestini, Lorenzo, Sharma, Varun, Shu, Jing, Simoniello, Rosa, Stark, Giordon Holtsberg, Stolarski, Daniel, Su, Shufang, Su, Wei, Sumensari, Olcyr, Sun, Xiaohu, Sundrum, Raman, Tang, Jian, Tesi, Andrea, Thomas, Brooks, Torre, Riccardo, Trifinopoulos, Sokratis, Vai, Ilaria, Valenti, Alessandro, Vittorio, Ludovico, Wang, Liantao, Wu, Yongcheng, Wulzer, Andrea, Zhao, Xiaoran, and Zurita, Jose

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

The perspective of designing muon colliders with high energy and luminosity, which is being investigated by the International Muon Collider Collaboration, has triggered a growing interest in their physics reach. We present a concise summary of the muon colliders potential to explore new physics, leveraging on the unique possibility of combining high available energy with very precise measurements., Comment: 21 pages, 7 figures; Contribution to Snowmass 2021

Published
2022

18. Erratum: Towards a muon collider

Author

Carlotta Accettura, Dean Adams, Rohit Agarwal, Claudia Ahdida, Chiara Aimè, Nicola Amapane, David Amorim, Paolo Andreetto, Fabio Anulli, Robert Appleby, Artur Apresyan, Aram Apyan, Sergey Arsenyev, Pouya Asadi, Mohammed Attia Mahmoud, Aleksandr Azatov, John Back, Lorenzo Balconi, Laura Bandiera, Roger Barlow, Nazar Bartosik, Emanuela Barzi, Fabian Batsch, Matteo Bauce, J. Scott Berg, Andrea Bersani, Alessandro Bertarelli, Alessandro Bertolin, Kevin Black, Fulvio Boattini, Alex Bogacz, Maurizio Bonesini, Bernardo Bordini, Salvatore Bottaro, Luca Bottura, Alessandro Braghieri, Marco Breschi, Natalie Bruhwiler, Xavier Buffat, Laura Buonincontri, Philip N. Burrows, Graeme Burt, Dario Buttazzo, Barbara Caiffi, Marco Calviani, Simone Calzaferri, Daniele Calzolari, Rodolfo Capdevilla, Christian Carli, Fausto Casaburo, Massimo Casarsa, Luca Castelli, Maria Gabriella Catanesi, Lorenzo Cavallucci, Gianluca Cavoto, Francesco Giovanni Celiberto, Luigi Celona, Alessandro Cerri, Gianmario Cesarini, Cari Cesarotti, Grigorios Chachamis, Antoine Chance, Siyu Chen, Yang-Ting Chien, Mauro Chiesa, Anna Colaleo, Francesco Collamati, Gianmaria Collazuol, Marco Costa, Nathaniel Craig, Camilla Curatolo, David Curtin, Giacomo Da Molin, Magnus Dam, Heiko Damerau, Sridhara Dasu, Jorge de Blas, Stefania De Curtis, Ernesto De Matteis, Stefania De Rosa, Jean-Pierre Delahaye, Dmitri Denisov, Haluk Denizli, Christopher Densham, Radovan Dermisek, Luca Di Luzio, Elisa Di Meco, Biagio Di Micco, Keith Dienes, Eleonora Diociaiuti, Tommaso Dorigo, Alexey Dudarev, Robert Edgecock, Filippo Errico, Marco Fabbrichesi, Stefania Farinon, Anna Ferrari, Jose Antonio Ferreira Somoza, Frank Filthaut, Davide Fiorina, Elena Fol, Matthew Forslund, Roberto Franceschini, Rui Franqueira Ximenes, Emidio Gabrielli, Michele Gallinaro, Francesco Garosi, Luca Giambastiani, Alessio Gianelle, Simone Gilardoni, Dario Augusto Giove, Carlo Giraldin, Alfredo Glioti, Mario Greco, Admir Greljo, Ramona Groeber, Christophe Grojean, Alexej Grudiev, Jiayin Gu, Chengcheng Han, Tao Han, John Hauptman, Brian Henning, Keith Hermanek, Matthew Herndon, Tova Ray Holmes, Samuel Homiller, Guoyuan Huang, Sudip Jana, Sergo Jindariani, Paul Bogdan Jurj, Yonatan Kahn, Ivan Karpov, David Kelliher, Wolfgang Kilian, Antti Kolehmainen, Kyoungchul Kong, Patrick Koppenburg, Nils Kreher, Georgios Krintiras, Karol Krizka, Gordan Krnjaic, Benjamin T. Kuchma, Nilanjana Kumar, Anton Lechner, Lawrence Lee, Qiang Li, Roberto Li Voti, Ronald Lipton, Zhen Liu, Shivani Lomte, Kenneth Long, Jose Lorenzo Gomez, Roberto Losito, Ian Low, Qianshu Lu, Donatella Lucchesi, Lianliang Ma, Yang Ma, Shinji Machida, Fabio Maltoni, Marco Mandurrino, Bruno Mansoulie, Luca Mantani, Claude Marchand, Samuele Mariotto, Stewart Martin-Haugh, David Marzocca, Paola Mastrapasqua, Giorgio Mauro, Andrea Mazzolari, Navin McGinnis, Patrick Meade, Barbara Mele, Federico Meloni, Matthias Mentink, Claudia Merlassino, Elias Metral, Rebecca Miceli, Natalia Milas, Nikolai Mokhov, Alessandro Montella, Tim Mulder, Riccardo Musenich, Marco Nardecchia, Federico Nardi, Niko Neufeld, David Neuffer, Daniel Novelli, Yasar Onel, Domizia Orestano, Daniele Paesani, Simone Pagan Griso, Mark Palmer, Paolo Panci, Giuliano Panico, Rocco Paparella, Paride Paradisi, Antonio Passeri, Nadia Pastrone, Antonello Pellecchia, Fulvio Piccinini, Alfredo Portone, Karolos Potamianos, Marco Prioli, Lionel Quettier, Emilio Radicioni, Raffaella Radogna, Riccardo Rattazzi, Diego Redigolo, Laura Reina, Elodie Resseguie, Jürgen Reuter, Pier Luigi Ribani, Cristina Riccardi, Lorenzo Ricci, Stefania Ricciardi, Luciano Ristori, Tania Natalie Robens, Werner Rodejohann, Chris Rogers, Marco Romagnoni, Kevin Ronald, Lucio Rossi, Richard Ruiz, Farinaldo S. Queiroz, Filippo Sala, Jakub Salko, Paola Salvini, Ennio Salvioni, Jose Santiago, Ivano Sarra, Francisco Javier Saura Esteban, Jochen Schieck, Daniel Schulte, Michele Selvaggi, Carmine Senatore, Abdulkadir Senol, Daniele Sertore, Lorenzo Sestini, Varun Sharma, Vladimir Shiltsev, Jing Shu, Federica Maria Simone, Rosa Simoniello, Kyriacos Skoufaris, Massimo Sorbi, Stefano Sorti, Anna Stamerra, Steinar Stapnes, Giordon Holtsberg Stark, Marco Statera, Bernd Stechauner, Daniel Stolarski, Diktys Stratakis, Shufang Su, Wei Su, Olcyr Sumensari, Xiaohu Sun, Raman Sundrum, Maximilian J. Swiatlowski, Alexei Sytov, Tim M. P. Tait, Jingyu Tang, Jian Tang, Andrea Tesi, Pietro Testoni, Brooks Thomas, Emily Anne Thompson, Riccardo Torre, Ludovico Tortora, Luca Tortora, Sokratis Trifinopoulos, Ilaria Vai, Marco Valente, Riccardo Umberto Valente, Alessandro Valenti, Nicolò Valle, Ursula van Rienen, Rosamaria Venditti, Arjan Verweij, Piet Verwilligen, Ludovico Vittorio, Paolo Vitulo, Liantao Wang, Hannsjorg Weber, Mariusz Wozniak, Richard Wu, Yongcheng Wu, Andrea Wulzer, Keping Xie, Akira Yamamoto, Yifeng Yang, Katsuya Yonehara, Sangsik Yoon, Angela Zaza, Xiaoran Zhao, Alexander Zlobin, Davide Zuliani, and Jose Zurita

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Published
2024
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19. Learning from Radiation at a Very High Energy Lepton Collider

Author

Chen, Siyu, Glioti, Alfredo, Rattazzi, Riccardo, Ricci, Lorenzo, and Wulzer, Andrea

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

We study the potential of lepton collisions with about $10\text{ TeV}$ center of mass energy to probe Electroweak, Higgs and Top short-distance physics at the $100\text{ TeV}$ scale, pointing out the interplay with the long-distance ($100\text{ GeV}$) phenomenon of Electroweak radiation. On one hand, we find that sufficiently accurate theoretical predictions require the resummed inclusion of radiation effects, which we perform at the double logarithmic order. On the other hand, we notice that short-distance physics does influence the emission of Electroweak radiation. Therefore the investigation of the radiation pattern can enhance the sensitivity to new short-distance physical laws. We illustrate these aspects by studying Effective Field Theory contact interactions in di-fermion and di-boson production, and comparing cross-section measurements that require or that exclude the emission of massive Electroweak bosons. The combination of the two types of measurements is found to enhance the sensitivity to the new interactions. Based on these results, we perform sensitivity projections to Higgs and Top Compositeness and to minimal $Z'$ new physics scenarios at future muon colliders., Comment: 48 pages, 17 figures

Published
2022
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20. Truncation, validity, uncertainties

Author

Brivio, Ilaria, Dawson, Sally, de Blas, Jorge, Durieux, Gauthier, Petrucciani, Giovanni, Savard, Pierre, Berger, Nicolas, Contino, Roberto, Degrande, Céline, Falkowski, Adam, Goertz, Florian, Gritsan, Andrei V., Grojean, Christophe, Lohwasser, Kristin, Maltoni, Fabio, Mimasu, Ken, Panico, Giuliano, Riva, Francesco, Shepherd, William, Vryonidou, Eleni, Wulzer, Andrea, and Zhang, Cen

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

The truncation of the standard-model effective field theory, its validity and the associated uncertainties have been discussed in meetings of the LHC EFT WG. Proposals were made by participants to address these issues. No consensus was reached and no formal recommendation is therefore put forward at this time. None of the proposals has been approved or validated and further work is needed to establish a prescription. This note aims at summarizing the proposals and points of debate., Comment: LHC EFT WG note, 8 pages; v2 includes a summary of the additional proposal D

Published
2022

21. Learning New Physics from an Imperfect Machine

Author

d'Agnolo, Raffaele Tito, Grosso, Gaia, Pierini, Maurizio, Wulzer, Andrea, and Zanetti, Marco

Subjects
High Energy Physics - Phenomenology
Abstract

We show how to deal with uncertainties on the Standard Model predictions in an agnostic new physics search strategy that exploits artificial neural networks. Our approach builds directly on the specific Maximum Likelihood ratio treatment of uncertainties as nuisance parameters for hypothesis testing that is routinely employed in high-energy physics. After presenting the conceptual foundations of our method, we first illustrate all aspects of its implementation and extensively study its performances on a toy one-dimensional problem. We then show how to implement it in a multivariate setup by studying the impact of two typical sources of experimental uncertainties in two-body final states at the LHC.

Published
2021

22. Erratum: Towards a muon collider

Author

Accettura, Carlotta, Adams, Dean, Agarwal, Rohit, Ahdida, Claudia, Aimè, Chiara, Amapane, Nicola, Amorim, David, Andreetto, Paolo, Anulli, Fabio, Appleby, Robert, Apresyan, Artur, Apyan, Aram, Arsenyev, Sergey, Asadi, Pouya, Mahmoud, Mohammed Attia, Azatov, Aleksandr, Back, John, Balconi, Lorenzo, Bandiera, Laura, Barlow, Roger, Bartosik, Nazar, Barzi, Emanuela, Batsch, Fabian, Bauce, Matteo, Berg, J. Scott, Bersani, Andrea, Bertarelli, Alessandro, Bertolin, Alessandro, Black, Kevin, Boattini, Fulvio, Bogacz, Alex, Bonesini, Maurizio, Bordini, Bernardo, Bottaro, Salvatore, Bottura, Luca, Braghieri, Alessandro, Breschi, Marco, Bruhwiler, Natalie, Buffat, Xavier, Buonincontri, Laura, Burrows, Philip N., Burt, Graeme, Buttazzo, Dario, Caiffi, Barbara, Calviani, Marco, Calzaferri, Simone, Calzolari, Daniele, Capdevilla, Rodolfo, Carli, Christian, Casaburo, Fausto, Casarsa, Massimo, Castelli, Luca, Catanesi, Maria Gabriella, Cavallucci, Lorenzo, Cavoto, Gianluca, Celiberto, Francesco Giovanni, Celona, Luigi, Cerri, Alessandro, Cesarini, Gianmario, Cesarotti, Cari, Chachamis, Grigorios, Chance, Antoine, Chen, Siyu, Chien, Yang-Ting, Chiesa, Mauro, Colaleo, Anna, Collamati, Francesco, Collazuol, Gianmaria, Costa, Marco, Craig, Nathaniel, Curatolo, Camilla, Curtin, David, Da Molin, Giacomo, Dam, Magnus, Damerau, Heiko, Dasu, Sridhara, de Blas, Jorge, De Curtis, Stefania, De Matteis, Ernesto, De Rosa, Stefania, Delahaye, Jean-Pierre, Denisov, Dmitri, Denizli, Haluk, Densham, Christopher, Dermisek, Radovan, Di Luzio, Luca, Di Meco, Elisa, Di Micco, Biagio, Dienes, Keith, Diociaiuti, Eleonora, Dorigo, Tommaso, Dudarev, Alexey, Edgecock, Robert, Errico, Filippo, Fabbrichesi, Marco, Farinon, Stefania, Ferrari, Anna, Somoza, Jose Antonio Ferreira, Filthaut, Frank, Fiorina, Davide, Fol, Elena, Forslund, Matthew, Franceschini, Roberto, Ximenes, Rui Franqueira, Gabrielli, Emidio, Gallinaro, Michele, Garosi, Francesco, Giambastiani, Luca, Gianelle, Alessio, Gilardoni, Simone, Giove, Dario Augusto, Giraldin, Carlo, Glioti, Alfredo, Greco, Mario, Greljo, Admir, Groeber, Ramona, Grojean, Christophe, Grudiev, Alexej, Gu, Jiayin, Han, Chengcheng, Han, Tao, Hauptman, John, Henning, Brian, Hermanek, Keith, Herndon, Matthew, Holmes, Tova Ray, Homiller, Samuel, Huang, Guoyuan, Jana, Sudip, Jindariani, Sergo, Jurj, Paul Bogdan, Kahn, Yonatan, Karpov, Ivan, Kelliher, David, Kilian, Wolfgang, Kolehmainen, Antti, Kong, Kyoungchul, Koppenburg, Patrick, Kreher, Nils, Krintiras, Georgios, Krizka, Karol, Krnjaic, Gordan, Kuchma, Benjamin T., Kumar, Nilanjana, Lechner, Anton, Lee, Lawrence, Li, Qiang, Voti, Roberto Li, Lipton, Ronald, Liu, Zhen, Lomte, Shivani, Long, Kenneth, Gomez, Jose Lorenzo, Losito, Roberto, Low, Ian, Lu, Qianshu, Lucchesi, Donatella, Ma, Lianliang, Ma, Yang, Machida, Shinji, Maltoni, Fabio, Mandurrino, Marco, Mansoulie, Bruno, Mantani, Luca, Marchand, Claude, Mariotto, Samuele, Martin-Haugh, Stewart, Marzocca, David, Mastrapasqua, Paola, Mauro, Giorgio, Mazzolari, Andrea, McGinnis, Navin, Meade, Patrick, Mele, Barbara, Meloni, Federico, Mentink, Matthias, Merlassino, Claudia, Metral, Elias, Miceli, Rebecca, Milas, Natalia, Mokhov, Nikolai, Montella, Alessandro, Mulder, Tim, Musenich, Riccardo, Nardecchia, Marco, Nardi, Federico, Neufeld, Niko, Neuffer, David, Novelli, Daniel, Onel, Yasar, Orestano, Domizia, Paesani, Daniele, Griso, Simone Pagan, Palmer, Mark, Panci, Paolo, Panico, Giuliano, Paparella, Rocco, Paradisi, Paride, Passeri, Antonio, Pastrone, Nadia, Pellecchia, Antonello, Piccinini, Fulvio, Portone, Alfredo, Potamianos, Karolos, Prioli, Marco, Quettier, Lionel, Radicioni, Emilio, Radogna, Raffaella, Rattazzi, Riccardo, Redigolo, Diego, Reina, Laura, Resseguie, Elodie, Reuter, Jürgen, Ribani, Pier Luigi, Riccardi, Cristina, Ricci, Lorenzo, Ricciardi, Stefania, Ristori, Luciano, Robens, Tania Natalie, Rodejohann, Werner, Rogers, Chris, Romagnoni, Marco, Ronald, Kevin, Rossi, Lucio, Ruiz, Richard, Queiroz, Farinaldo S., Sala, Filippo, Salko, Jakub, Salvini, Paola, Salvioni, Ennio, Santiago, Jose, Sarra, Ivano, Esteban, Francisco Javier Saura, Schieck, Jochen, Schulte, Daniel, Selvaggi, Michele, Senatore, Carmine, Senol, Abdulkadir, Sertore, Daniele, Sestini, Lorenzo, Sharma, Varun, Shiltsev, Vladimir, Shu, Jing, Simone, Federica Maria, Simoniello, Rosa, Skoufaris, Kyriacos, Sorbi, Massimo, Sorti, Stefano, Stamerra, Anna, Stapnes, Steinar, Stark, Giordon Holtsberg, Statera, Marco, Stechauner, Bernd, Stolarski, Daniel, Stratakis, Diktys, Su, Shufang, Su, Wei, Sumensari, Olcyr, Sun, Xiaohu, Sundrum, Raman, Swiatlowski, Maximilian J., Sytov, Alexei, Tait, Tim M. P., Tang, Jingyu, Tang, Jian, Tesi, Andrea, Testoni, Pietro, Thomas, Brooks, Thompson, Emily Anne, Torre, Riccardo, Tortora, Ludovico, Tortora, Luca, Trifinopoulos, Sokratis, Vai, Ilaria, Valente, Marco, Valente, Riccardo Umberto, Valenti, Alessandro, Valle, Nicolò, Rienen, Ursula van, Venditti, Rosamaria, Verweij, Arjan, Verwilligen, Piet, Vittorio, Ludovico, Vitulo, Paolo, Wang, Liantao, Weber, Hannsjorg, Wozniak, Mariusz, Wu, Richard, Wu, Yongcheng, Wulzer, Andrea, Xie, Keping, Yamamoto, Akira, Yang, Yifeng, Yonehara, Katsuya, Yoon, Sangsik, Zaza, Angela, Zhao, Xiaoran, Zlobin, Alexander, Zuliani, Davide, and Zurita, Jose

Published
2024
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23. Towards a muon collider

Author

Carlotta Accettura, Dean Adams, Rohit Agarwal, Claudia Ahdida, Chiara Aimè, Nicola Amapane, David Amorim, Paolo Andreetto, Fabio Anulli, Robert Appleby, Artur Apresyan, Aram Apyan, Sergey Arsenyev, Pouya Asadi, Mohammed Attia Mahmoud, Aleksandr Azatov, John Back, Lorenzo Balconi, Laura Bandiera, Roger Barlow, Nazar Bartosik, Emanuela Barzi, Fabian Batsch, Matteo Bauce, J. Scott Berg, Andrea Bersani, Alessandro Bertarelli, Alessandro Bertolin, Kevin Black, Fulvio Boattini, Alex Bogacz, Maurizio Bonesini, Bernardo Bordini, Salvatore Bottaro, Luca Bottura, Alessandro Braghieri, Marco Breschi, Natalie Bruhwiler, Xavier Buffat, Laura Buonincontri, Philip N. Burrows, Graeme Burt, Dario Buttazzo, Barbara Caiffi, Marco Calviani, Simone Calzaferri, Daniele Calzolari, Rodolfo Capdevilla, Christian Carli, Fausto Casaburo, Massimo Casarsa, Luca Castelli, Maria Gabriella Catanesi, Lorenzo Cavallucci, Gianluca Cavoto, Francesco Giovanni Celiberto, Luigi Celona, Alessandro Cerri, Gianmario Cesarini, Cari Cesarotti, Grigorios Chachamis, Antoine Chance, Siyu Chen, Yang-Ting Chien, Mauro Chiesa, Anna Colaleo, Francesco Collamati, Gianmaria Collazuol, Marco Costa, Nathaniel Craig, Camilla Curatolo, David Curtin, Giacomo Da Molin, Magnus Dam, Heiko Damerau, Sridhara Dasu, Jorge de Blas, Stefania De Curtis, Ernesto De Matteis, Stefania De Rosa, Jean-Pierre Delahaye, Dmitri Denisov, Haluk Denizli, Christopher Densham, Radovan Dermisek, Luca Di Luzio, Elisa Di Meco, Biagio Di Micco, Keith Dienes, Eleonora Diociaiuti, Tommaso Dorigo, Alexey Dudarev, Robert Edgecock, Filippo Errico, Marco Fabbrichesi, Stefania Farinon, Anna Ferrari, Jose Antonio Ferreira Somoza, Frank Filthaut, Davide Fiorina, Elena Fol, Matthew Forslund, Roberto Franceschini, Rui Franqueira Ximenes, Emidio Gabrielli, Michele Gallinaro, Francesco Garosi, Luca Giambastiani, Alessio Gianelle, Simone Gilardoni, Dario Augusto Giove, Carlo Giraldin, Alfredo Glioti, Mario Greco, Admir Greljo, Ramona Groeber, Christophe Grojean, Alexej Grudiev, Jiayin Gu, Chengcheng Han, Tao Han, John Hauptman, Brian Henning, Keith Hermanek, Matthew Herndon, Tova Ray Holmes, Samuel Homiller, Guoyuan Huang, Sudip Jana, Sergo Jindariani, Paul Bogdan Jurj, Yonatan Kahn, Ivan Karpov, David Kelliher, Wolfgang Kilian, Antti Kolehmainen, Kyoungchul Kong, Patrick Koppenburg, Nils Kreher, Georgios Krintiras, Karol Krizka, Gordan Krnjaic, Benjamin T. Kuchma, Nilanjana Kumar, Anton Lechner, Lawrence Lee, Qiang Li, Roberto Li Voti, Ronald Lipton, Zhen Liu, Shivani Lomte, Kenneth Long, Jose Lorenzo Gomez, Roberto Losito, Ian Low, Qianshu Lu, Donatella Lucchesi, Lianliang Ma, Yang Ma, Shinji Machida, Fabio Maltoni, Marco Mandurrino, Bruno Mansoulie, Luca Mantani, Claude Marchand, Samuele Mariotto, Stewart Martin-Haugh, David Marzocca, Paola Mastrapasqua, Giorgio Mauro, Andrea Mazzolari, Navin McGinnis, Patrick Meade, Barbara Mele, Federico Meloni, Matthias Mentink, Claudia Merlassino, Elias Metral, Rebecca Miceli, Natalia Milas, Nikolai Mokhov, Alessandro Montella, Tim Mulder, Riccardo Musenich, Marco Nardecchia, Federico Nardi, Niko Neufeld, David Neuffer, Daniel Novelli, Yasar Onel, Domizia Orestano, Daniele Paesani, Simone Pagan Griso, Mark Palmer, Paolo Panci, Giuliano Panico, Rocco Paparella, Paride Paradisi, Antonio Passeri, Nadia Pastrone, Antonello Pellecchia, Fulvio Piccinini, Alfredo Portone, Karolos Potamianos, Marco Prioli, Lionel Quettier, Emilio Radicioni, Raffaella Radogna, Riccardo Rattazzi, Diego Redigolo, Laura Reina, Elodie Resseguie, Jürgen Reuter, Pier Luigi Ribani, Cristina Riccardi, Lorenzo Ricci, Stefania Ricciardi, Luciano Ristori, Tania Natalie Robens, Werner Rodejohann, Chris Rogers, Marco Romagnoni, Kevin Ronald, Lucio Rossi, Richard Ruiz, Farinaldo S. Queiroz, Filippo Sala, Jakub Salko, Paola Salvini, Ennio Salvioni, Jose Santiago, Ivano Sarra, Francisco Javier Saura Esteban, Jochen Schieck, Daniel Schulte, Michele Selvaggi, Carmine Senatore, Abdulkadir Senol, Daniele Sertore, Lorenzo Sestini, Varun Sharma, Vladimir Shiltsev, Jing Shu, Federica Maria Simone, Rosa Simoniello, Kyriacos Skoufaris, Massimo Sorbi, Stefano Sorti, Anna Stamerra, Steinar Stapnes, Giordon Holtsberg Stark, Marco Statera, Bernd Stechauner, Daniel Stolarski, Diktys Stratakis, Shufang Su, Wei Su, Olcyr Sumensari, Xiaohu Sun, Raman Sundrum, Maximilian J. Swiatlowski, Alexei Sytov, Tim M. P. Tait, Jingyu Tang, Jian Tang, Andrea Tesi, Pietro Testoni, Brooks Thomas, Emily Anne Thompson, Riccardo Torre, Ludovico Tortora, Luca Tortora, Sokratis Trifinopoulos, Ilaria Vai, Marco Valente, Riccardo Umberto Valente, Alessandro Valenti, Nicolò Valle, Ursula van Rienen, Rosamaria Venditti, Arjan Verweij, Piet Verwilligen, Ludovico Vittorio, Paolo Vitulo, Liantao Wang, Hannsjorg Weber, Mariusz Wozniak, Richard Wu, Yongcheng Wu, Andrea Wulzer, Keping Xie, Akira Yamamoto, Yifeng Yang, Katsuya Yonehara, Sangsik Yoon, Angela Zaza, Xiaoran Zhao, Alexander Zlobin, Davide Zuliani, and Jose Zurita

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

Abstract A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work.

Published
2023
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24. High-energy EFT probes with fully differential Drell-Yan measurements

Author

Panico, Giuliano, Ricci, Lorenzo, and Wulzer, Andrea

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

We study the potential of fully-differential measurements of high-energy dilepton cross-sections at the LHC to probe heavy new physics encapsulated in dimension-6 interaction operators. The assessment is performed in the seven-dimensional parameter space of operators that induce energy-growing corrections to the Standard Model partonic cross-sections at the interference level, and in the two-dimensional subspace associated with the W and Y parameters. A considerable sensitivity improvement is found relative to single-differential measurements, owing to the possibility of probing at the interference level more directions in the seven-dimensional parameter space. The reduction of parton distribution function uncertainties in the fully-differential fit is also found to play a significant role. The results are interpreted in the minimal Z' new-physics model, providing a concrete illustration of the advantages of the fully-differential analysis. We find that high-energy dilepton measurements can extend the Z' exclusion and discovery potential well beyond the reach of direct searches in a large region of the parameter space., Comment: 26 pages, 9 figures

Published
2021
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25. Two Paths Towards Precision at a Very High Energy Lepton Collider

Author

Buttazzo, Dario, Franceschini, Roberto, and Wulzer, Andrea

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

We illustrate the potential of a very high energy lepton collider (from 10 to 30 TeV center of mass energy) to explore new physics indirectly in the vector boson fusion double Higgs production process and in direct diboson production at high energy. Double Higgs production is found to be sensitive to the anomalous Higgs trilinear coupling at the percent level, and to the Higgs compositeness $\xi$ parameter at the per mille or sub-per mille level thanks to the measurement of the cross-section in the di-Higgs high invariant mass tail. High energy diboson (and tri-boson) production is sensitive to Higgs-lepton contact interaction operators at a scale of several tens or hundred TeV, corresponding to a reach on the Higgs compositeness scale well above the one of any other future collider project currently under discussion. This result follows from the unique capability of the very high energy lepton collider to measure Electroweak cross-sections at 10 TeV energy or more, where the effect of new physics at even higher energy is amplified. The general lesson is that the standard path towards precision physics, based on measurements of high-statistics processes such as single and double Higgs production, is accompanied at the very high energy lepton collider by a second strategy based on measurements at the highest available energy., Comment: 32 pages, 12 figures, 9 tables

Published
2020
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26. On the W&Y interpretation of high-energy Drell-Yan measurements

Author

Ricci, Lorenzo, Torre, Riccardo, and Wulzer, Andrea

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

High-energy neutral and charged Drell--Yan differential cross-section measurements are powerful probes of quark-lepton contact interactions that produce growing-with-energy effects. This paper provides theoretical predictions of the new physics effects at the Next-to-Leading order in QCD and including one-loop EW corrections at the single-logarithm accuracy. The predictions are obtained from SM Monte Carlo simulations through analytic reweighting. This eliminates the need of performing a scan on the new physics parameter space, enabling the global exploration of all the relevant interactions. Furthermore, our strategy produces consistently showered events to be employed for a direct comparison of the new physics predictions with the data, or to validate the unfolding procedure than underlies the cross-section measurements. Two particularly relevant interactions, associated with the W and Y parameters of EW precision tests, are selected for illustration. Projections are presented for the sensitivity of the LHC and of the HL-LHC measurements. The impact on the sensitivity of several sources of uncertainties is quantified., Comment: 32 page, 10 figures, 3 tables; v2: several plots have been updated to fix a problem in the code, the overall discussion has been slightly improved, and few typos have been corrected; v3: typos corrected, preprint added

Published
2020

27. Parametrized classifiers for optimal EFT sensitivity

Author

Chen, Siyu, Glioti, Alfredo, Panico, Giuliano, and Wulzer, Andrea

Subjects
High Energy Physics - Phenomenology
Abstract

We study unbinned multivariate analysis techniques, based on Statistical Learning, for indirect new physics searches at the LHC in the Effective Field Theory framework. We focus in particular on high-energy $ZW$ production with fully leptonic decays, modeled at different degrees of refinement up to NLO in QCD. We show that a considerable gain in sensitivity is possible compared with current projections based on binned analyses. As expected, the gain is particularly significant for those operators that display a complex pattern of interference with the Standard Model amplitude. The most effective method is found to be the "Quadratic Classifier" approach, an improvement of the standard Statistical Learning classifier where the quadratic dependence of the differential cross section on the EFT Wilson coefficients is built-in and incorporated in the loss function. We argue that the Quadratic Classifier performances are nearly statistically optimal, based on a rigorous notion of optimality that we can establish for an approximate analytic description of the $ZW$ process., Comment: 34 pages, 9 figures

Published
2020
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28. Learning Multivariate New Physics

Author

D'Agnolo, Raffaele Tito, Grosso, Gaia, Pierini, Maurizio, Wulzer, Andrea, and Zanetti, Marco

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

We discuss a method that employs a multilayer perceptron to detect deviations from a reference model in large multivariate datasets. Our data analysis strategy does not rely on any prior assumption on the nature of the deviation. It is designed to be sensitive to small discrepancies that arise in datasets dominated by the reference model. The main conceptual building blocks were introduced in Ref. [1]. Here we make decisive progress in the algorithm implementation and we demonstrate its applicability to problems in high energy physics. We show that the method is sensitive to putative new physics signals in di-muon final states at the LHC. We also compare our performances on toy problems with the ones of alternative methods proposed in the literature.

Published
2019

29. Goodness of fit by Neyman-Pearson testing

Author

Gaia Grosso, Marco Letizia, Maurizio Pierini, Andrea Wulzer

Subjects
Physics, QC1-999
Abstract

The Neyman-Pearson strategy for hypothesis testing can be employed for goodness of fit if the alternative hypothesis is selected from data by exploring a rich parametrised family of models, while controlling the impact of statistical fluctuations. The New Physics Learning Machine (NPLM) methodology has been developed as a concrete implementation of this idea, to target the detection of new physical effects in the context of high energy physics collider experiments. In this paper we conduct a comparison of this approach to goodness of fit with others, in particular with classifier-based strategies that share strong similarities with NPLM. From our comparison, NPLM emerges as the more sensitive test to small departures of the data from the expected distribution and not biased towards detecting specific types of anomalies. These features make it suited for agnostic searches for new physics at collider experiments. Its deployment in other scientific and industrial scenarios should be investigated.

Published
2024
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30. Goldstone Equivalence and High Energy Electroweak Physics

Author

Cuomo, Gabriel, Vecchi, Luca, and Wulzer, Andrea

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

The transition between the broken and unbroken phases of massive gauge theories, namely the rearrangement of longitudinal and Goldstone degrees of freedom that occurs at high energy, is not manifestly smooth in the standard formalism. The lack of smoothness concretely shows up as an anomalous growth with energy of the longitudinal polarization vectors, as they emerge in Feynman rules both for real on-shell external particles and for virtual particles from the decomposition of the gauge field propagator. This makes the characterization of Feynman amplitudes in the high-energy limit quite cumbersome, which in turn poses peculiar challenges in the study of Electroweak processes at energies much above the Electroweak scale. We develop a Lorentz-covariant formalism where polarization vectors are well-behaved and, consequently, energy power-counting is manifest at the level of individual Feynman diagrams. This allows us to prove the validity of the Effective W Approximation and, more generally, the factorization of collinear emissions and to compute the corresponding splitting functions at the tree-level order. Our formalism applies at all orders in perturbation theory, for arbitrary gauge groups and generic linear gauge-fixing functionals. It can be used to simplify Standard Model loop calculations by performing the high-energy expansion directly on the Feynman diagrams. This is illustrated by computing the radiative corrections to the decay of the top quark., Comment: 50 pages + appendices, 7 figures, v2 fixed typos, added fig. 5

Published
2019
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31. Higgs Physics at the HL-LHC and HE-LHC

Author

Cepeda, M., Gori, S., Ilten, P., Kado, M., Riva, F., Khalek, R. Abdul, Aboubrahim, A., Alimena, J., Alioli, S., Alves, A., Asawatangtrakuldee, C., Azatov, A., Azzi, P., Bailey, S., Banerjee, S., Barberio, E. L., Barducci, D., Barone, G., Bauer, M., Bautista, C., Bechtle, P., Becker, K., Benaglia, A., Bengala, M., Berger, N., Bertella, C., Bethani, A., Betti, A., Biekotter, A., Bishara, F., Bloch, D., Bokan, P., Bondu, O., Bonvini, M., Borgonovi, L., Borsato, M., Boselli, S., Braibant-Giacomelli, S., Buchalla, G., Cadamuro, L., Caillol, C., Calandri, A., Tazon, A. Calderon, Campbell, J. M., Caola, F., Capozi, M., Carena, M., Calame, C. M. Carloni, Carmona, A., Carquin, E., De Oliveira, A. Carvalho Antunes, Hernandez, A. Castaneda, Cata, O., Celis, A., Cerri, A., Cerutti, F., Chahal, G. S., Chakraborty, A., Chaudhary, G., Chen, X., Chisholm, A. S., Contino, R., Costa, A. J., Covarelli, R., Craig, N., Curtin, D., D'Eramo, L., Dang, N. P., Das, P., Dawson, S., Francisco, O. A. De Aguiar, de Blas, J., De Curtis, S., De Filippis, N., De la Torre, H., de Lima, L., De Wit, A., Delaere, C., Delcourt, M., Delmastro, M., Demers, S., Dev, N., Di Nardo, R., Di Vita, S., Dildick, S., Prado, L. A. F. do, Donadelli, M., Du, D., Durieux, G., Dührssen, M., Eberhardt, O., Morabit, K. El, Elias-Miro, J., Ellis, J., Englert, C., Essig, R., Falke, S., Farina, M., Ferrari, A., Ferroglia, A., Fiolhais, M. C. N., Flechl, M., Folgueras, S., Fontanesi, E., Francavilla, P., Franceschini, R., Frederix, R., Frixione, S., Gómez-Ceballos, G., Gabrielli, A., Gadatsch, S., Gallinaro, M., Gandrakota, A., Gao, J., Walls, F. M. Garay, Gehrmann, T., Gershtein, Y., Ghosh, T., Gilbert, A., Glein, R., Glover, E. W. N., Gomez-Ambrosio, R., Gonçalo, R., Gonçalves, D., Gorbahn, M., Gouveia, E., Gouzevitch, M., Govoni, P., Grazzini, M., Greenberg, B., Grimm, K., Gritsan, A. V., Grohsjean, A., Grojean, C., Gu, J., Gugel, R., Gupta, R. S., Gwilliam, C. B., Höche, S., Haacke, M., Haddad, Y., Haisch, U., Hamity, G. N., Han, T., Harland-Lang, L. A., Harnik, R., Heinemeyer, S., Heinrich, G., Henning, B., Hirschi, V., Hoepfner, K., Hogan, J. M., Homiller, S., Huang, Y., Huss, A., Jézéquel, S., Jain, Sa., Jones, S. P., Köneke, K., Kalinowski, J., Kamenik, J. F., Kaplan, M., Karlberg, A., Kaur, M., Keicher, P., Kerner, M., Khanov, A., Kieseler, J., Kim, J. H., Kim, M., Klijnsma, T., Kling, F., Klute, M., Komaragiri, J. R., Kong, K., Kozaczuk, J., Kozow, P, Krause, C., Lai, S., Langford, J., Le, B., Lechner, L., Leight, W. A., Leney, K. J. C., Lenz, T., Li, C-Q., Li, H., Li, Q., Liebler, S., Lindert, J., Liu, D., Liu, J., Liu, Y., Liu, Z., Lombardo, D., Long, A., Long, K., Low, I., Luisoni, G., Ma, L. L., Magnan, A. -M., Majumder, D., Malinauskas, A., Maltoni, F., Mangano, M. L., Marchiori, G., Marini, A. C., Martin, A., Marzani, S., Massironi, A., Matchev, K. T., Matheus, R. D., Mazumdar, K., Mazzitelli, J., Mcdougall, A. E., Meade, P., Meridiani, P., Meyer, A. B., Michielin, E., Milenovic, P., Milosevic, V., Mimasu, K., Mistlberger, B., Mlynarikova, M., Mondragon, M., Monni, P. F., Montagna, G., Monti, F., Llacer, M. Moreno, Mueck, A., Muiño, P. C., Murphy, C., Murray, W. J., Musella, P., Narain, M., Garcia, R. F. Naranjo, Nath, P., Neubert, M., Nicrosini, O., Nikolopoulos, K., Nisati, A., No, J. M., Ojeda, M. L., Pino, S. A. Olivares, Onofre, A., Ortona, G., Griso, S. Pagan, Pagani, D., Cortezon, E. Palencia, Palmer, C., Pandini, C., Panico, G., Panwar, L., Pappadopulo, D., Park, M., Patel, R., Paucar-Velasquez, F., Pedro, K., Pernie, L., Perrozzi, L., Petersen, B. A., Petit, E., Petrucciani, G., Piacquadio, G., Piccinini, F., Pieri, M., Plehn, T., Pokorski, S., Pomarol, A., Ponton, E., Pozzorini, S., Prestel, S., Prokofiev, K., Ramsey-Musolf, M., Re, E., Readioff, N. P., Redigolo, D., Reina, L., Reynolds, E., Riembau, M., Rikkert, F., Robens, T., Roentsch, R., Rojo, J., Rompotis, N., Rorie, J., Rosiek, J., Roskes, J., Ruderman, J. T., Sahoo, N., Saito, S., Salerno, R., De Bruin, P. H. Sales, Salvucci, A., Sandeep, K., Santiago, J., Santo, R., Sanz, V., Sarica, U., Savin, A., Savoy-Navarro, A., Sawant, S., Schaffer, A. C., Schlaffer, M., Schmidt, A., Schneider, B., Schoefbeck, R., Schröder, M., Scodeggio, M., Scott, E., Scyboz, L., Selvaggi, M., Sestini, L., Shao, H. -S., Shivaji, A., Silvestrini, L., Simon, L., Sinha, K., Soreq, Y., Spannowsky, M., Spira, M., Spitzbart, D., Stamou, E., Stark, J., Stefaniak, T., Stieger, B., Strong, G., Szleper, M., Tackmann, K., Takeuchi, M., Taroni, S., Testa, M., Thamm, A., Theeuwes, V., Thomsen, L. A., Tkaczyk, S., Torre, R., Tramontano, F., Ulmer, K. A., Vantalon, T., Vecchi, L., Vega-Morales, R., Venturini, E., Verducci, M., Vernieri, C., Vickey, T., Marono, M. Vidal, Vischia, P., Vryonidou, E., Wagner, P., Walbrecht, V. M., Wang, L. -T., Wardle, N., Wardrope, D. R., Weiglein, G., Wertz, S., Wielers, M., Williams, J. M., Wolf, R., Wulzer, A., Xiao, M., Yang, H. T., Yazgan, E., Yin, Z., You, T., Yu, F., Zanderighi, G., Zanzi, D., Zaro, M., Zenz, S. C., Zerwas, D., Zgubič, M., Zhang, J., Zhang, L., Zhang, W., Zhao, X., and Zhong, Y. -M.

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

The discovery of the Higgs boson in 2012, by the ATLAS and CMS experiments, was a success achieved with only a percent of the entire dataset foreseen for the LHC. It opened a landscape of possibilities in the study of Higgs boson properties, Electroweak Symmetry breaking and the Standard Model in general, as well as new avenues in probing new physics beyond the Standard Model. Six years after the discovery, with a conspicuously larger dataset collected during LHC Run 2 at a 13 TeV centre-of-mass energy, the theory and experimental particle physics communities have started a meticulous exploration of the potential for precision measurements of its properties. This includes studies of Higgs boson production and decays processes, the search for rare decays and production modes, high energy observables, and searches for an extended electroweak symmetry breaking sector. This report summarises the potential reach and opportunities in Higgs physics during the High Luminosity phase of the LHC, with an expected dataset of pp collisions at 14 TeV, corresponding to an integrated luminosity of 3 ab$^{-1}$. These studies are performed in light of the most recent analyses from LHC collaborations and the latest theoretical developments. The potential of an LHC upgrade, colliding protons at a centre-of-mass energy of 27 TeV and producing a dataset corresponding to an integrated luminosity of 15 ab$^{-1}$, is also discussed., Comment: Report from Working Group 2 on the Physics of the HL-LHC, and Perspectives at the HE-LHC, 364 pages

Published
2019

32. Muon Colliders

Author

Delahaye, Jean Pierre, Diemoz, Marcella, Long, Ken, Mansoulié, Bruno, Pastrone, Nadia, Rivkin, Lenny, Schulte, Daniel, Skrinsky, Alexander, and Wulzer, Andrea

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

Muon colliders have a great potential for high-energy physics. They can offer collisions of point-like particles at very high energies, since muons can be accelerated in a ring without limitation from synchrotron radiation. However, the need for high luminosity faces technical challenges which arise from the short muon lifetime at rest and the difficulty of producing large numbers of muons in bunches with small emittance. Addressing these challenges requires the development of innovative concepts and demanding technologies. The document summarizes the work done, the progress achieved and new recent ideas on muon colliders. A set of further studies and actions is also identified to advance in the field. Finally, a set of recommendations is listed in order to make the muon technology mature enough to be favourably considered as a candidate for high-energy facilities in the future., Comment: Input to the European Particle Physics Strategy Update by the Muon Collider Working Group

Published
2019

33. Behind the Standard Model

Author

Wulzer, Andrea

Subjects
High Energy Physics - Phenomenology
Abstract

These lectures provide a concise introduction to the so-called "Beyond the Standard Model"' physics, with particular emphasis on the problem of the microscopic origin of the Higgs mass term and of the Electro-Weak symmetry breaking scale in connection with Naturalness. The standard scenarios of Supersymmetry and Composite Higgs are shortly reviewed. An attempt is made to summarise the implications of the LHC run-$1$ results on what we expect to lie beyond (or behind) the Standard Model., Comment: Presented at the Proceedings of the 2015 European School of High-Energy Physics, Bansko, Bulgaria -- 2-15 September 2015

Published
2019

34. The Compact Linear e$^+$e$^-$ Collider (CLIC): Physics Potential

Author

Roloff, P., Franceschini, R., Schnoor, U., and Wulzer, A.

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

The Compact Linear Collider, CLIC, is a proposed e$^+$e$^-$ collider at the TeV scale whose physics potential ranges from high-precision measurements to extensive direct sensitivity to physics beyond the Standard Model. This document summarises the physics potential of CLIC, obtained in detailed studies, many based on full simulation of the CLIC detector. CLIC covers one order of magnitude of centre-of-mass energies from 350 GeV to 3 TeV, giving access to large event samples for a variety of SM processes, many of them for the first time in e$^+$e$^-$ collisions or for the first time at all. The high collision energy combined with the large luminosity and clean environment of the e$^+$e$^-$ collisions enables the measurement of the properties of Standard Model particles, such as the Higgs boson and the top quark, with unparalleled precision. CLIC might also discover indirect effects of very heavy new physics by probing the parameters of the Standard Model Effective Field Theory with an unprecedented level of precision. The direct and indirect reach of CLIC to physics beyond the Standard Model significantly exceeds that of the HL-LHC. This includes new particles detected in challenging non-standard signatures. With this physics programme, CLIC will decisively advance our knowledge relating to the open questions of particle physics., Comment: Input to the European Particle Physics Strategy Update on behalf of the CLIC and CLICdp Collaborations

Published
2018

35. The Compact Linear Collider (CLIC) - 2018 Summary Report

Author

CLIC, The, collaborations, CLICdp, Charles, T. K., Giansiracusa, P. J., Lucas, T. G., Rassool, R. P., Volpi, M., Balazs, C., Afanaciev, K., Makarenko, V., Patapenka, A., Zhuk, I., Collette, C., Boland, M. J., Hoffman, A. C. Abusleme, Diaz, M. A., Garay, F., Chi, Y., He, X., Pei, G., Pei, S., Shu, G., Wang, X., Zhang, J., Zhao, F., Zhou, Z., Chen, H., Gao, Y., Huang, W., Kuang, Y. P., Li, B., Li, Y., Meng, X., Shao, J., Shi, J., Tang, C., Wang, P., Wu, X., Zha, H., Ma, L., Han, Y., Fang, W., Gu, Q., Huang, D., Huang, X., Tan, J., Wang, Z., Zhao, Z., Uggerhøj, U. I., Wistisen, T. N., Aabloo, A., Aare, R., Kuppart, K., Vigonski, S., Zadin, V., Aicheler, M., Baibuz, E., Brücken, E., Djurabekova, F., Eerola, P., Garcia, F., Haeggström, E., Huitu, K., Jansson, V., Kassamakov, I., Kimari, J., Kyritsakis, A., Lehti, S., Meriläinen, A., Montonen, R., Nordlund, K., Österberg, K., Saressalo, A., Väinölä, J., Veske, M., Farabolini, W., Mollard, A., Peauger, F., Plouin, J., Bambade, P., Chaikovska, I., Chehab, R., Delerue, N., Davier, M., Faus-Golfe, A., Irles, A., Kaabi, W., LeDiberder, F., Pöschl, R., Zerwas, D., Aimard, B., Balik, G., Blaising, J. -J., Brunetti, L., Chefdeville, M., Dominjon, A., Drancourt, C., Geoffroy, N., Jacquemier, J., Jeremie, A., Karyotakis, Y., Nappa, J. M., Serluca, M., Vilalte, S., Vouters, G., Bernhard, A., Bründermann, E., Casalbuoni, S., Hillenbrand, S., Gethmann, J., Grau, A., Huttel, E., Müller, A. -S., Peiffer, P., Perić, I., de Jauregui, D. Saez, Emberger, L., Graf, C., Simon, F., Szalay, M., van der Kolk, N., Brass, S., Kilian, W., Alexopoulos, T., Apostolopoulos, T., Gazis, E. N., Gazis, N., Kostopoulos, V., Kourkoulis, S., Heilig, B., Lichtenberger, J., Shrivastava, P., Dayyani, M. K., Ghasem, H., Hajari, S. S., Shaker, H., Ashkenazy, Y., Popov, I., Engelberg, E., Yashar, A., Abramowicz, H., Benhammou, Y., Borysov, O., Borysova, M., Levy, A., Levy, I., Alesini, D., Bellaveglia, M., Buonomo, B., Cardelli, A., Diomede, M., Ferrario, M., Gallo, A., Ghigo, A., Giribono, A., Piersanti, L., Stella, A., Vaccarezza, C., de Blas, J., Franceschini, R., D'Auria, G., Di Mitri, S., Abe, T., Aryshev, A., Fukuda, M., Furukawa, K., Hayano, H., Higashi, Y., Higo, T., Kubo, K., Kuroda, S., Matsumoto, S., Michizono, S., Naito, T., Okugi, T., Shidara, T., Tauchi, T., Terunuma, N., Urakawa, J., Yamamoto, A., Raboanary, R., Luiten, O. J., Stragier, X. F. D., Hart, R., van der Graaf, H., Eigen, G., Adli, E., Lindstrøm, C. A., Lillestøl, R., Malina, L., Pfingstner, J., Sjobak, K. N., Ahmad, A., Hoorani, H., Khan, W. A., Bugiel, S., Bugiel, R., Firlej, M., Fiutowski, T. A., Idzik, M., Moroń, J., Świentek, K. P., de Renstrom, P. Brückman, Krupa, B., Kucharczyk, M., Lesiak, T., Pawlik, B., Sopicki, P., Turbiarz, B., Wojtoń, T., Zawiejski, L. K., Kalinowski, J., Nowak, K., Żarnecki, A. F., Firu, E., Ghenescu, V., Neagu, A. T., Preda, T., Zgura, I. S., Aloev, A., Azaryan, N., Boyko, I., Budagov, J., Chizhov, M., Filippova, M., Glagolev, V., Gongadze, A., Grigoryan, S., Gudkov, D., Karjavine, V., Lyablin, M., Nefedov, Yu., Olyunin, A., Rymbekova, A., Samochkine, A., Sapronov, A., Shelkov, G., Shirkov, G., Soldatov, V., Solodko, E., Trubnikov, G., Tyapkin, I., Uzhinsky, V., Vorozhtov, A., Zhemchugov, A., Levichev, E., Mezentsev, N., Piminov, P., Shatilov, D., Vobly, P., Zolotarev, K., Jelisavčić, I. Božović, Kačarević, G., Dumbelović, G. Milutinović, Pandurović, M., Radulović, M., Stevanović, J., Vukasinović, N., Lee, D. -H., Ayala, N., Benedetti, G., Guenzel, T., Iriso, U., Marti, Z., Perez, F., Pont, M., Trenado, J., Ruiz-Jimeno, A., Vila, I., Calero, J., Dominguez, M., Garcia-Tabares, L., Gavela, D., Lopez, D., Toral, F., Gutierrez, C. Blanch, Boronat, M., Esperante, D., Fullana, E., Fuster, J., García, I., Gimeno, B., Lopez, P. Gomis, González, D., Perelló, M., Ros, E., Villarejo, M. A., Vnuchenko, A., Vos, M., Borgmann, Ch., Brenner, R., Ekelöf, T., Jacewicz, M., Olvegård, M., Ruber, R., Ziemann, V., Aguglia, D., Gonzalvo, J. Alabau, Leon, M. Alcaide, Tehrani, N. Alipour, Anastasopoulos, M., Andersson, A., Andrianala, F., Antoniou, F., Apyan, A., Arominski, D., Artoos, K., Assly, S., Atieh, S., Baccigalupi, C., Sune, R. Ballabriga, Caballero, D. Banon, Barnes, M. J., Garcia, J. Barranco, Bartalesi, A., Bauche, J., Bayar, C., Belver-Aguilar, C., Morell, A. Benot, Bernardini, M., Bett, D. R., Bettoni, S., Bettencourt, M., Bielawski, B., Garcia, O. Blanco, Kraljevic, N. Blaskovic, Bolzon, B., Bonnin, X. A., Bozzini, D., Branger, E., Brondolin, E., Brunner, O., Buckland, M., Bursali, H., Burkhardt, H., Caiazza, D., Calatroni, S., Campbell, M., Lasheras, N. Catalan, Cassany, B., Castro, E., Soares, R. H. Cavaleiro, Bastos, M. Cerqueira, Cherif, A., Chevallay, E., Cilento, V., Corsini, R., Costa, R., Cure, B., Curt, S., Gobbo, A. Dal, Dannheim, D., Daskalaki, E., Deacon, L., Degiovanni, A., De Michele, G., De Oliveira, L., Romano, V. Del Pozo, Delahaye, J. P., Delikaris, D., de Almeida, P. G. Dias, Dobers, T., Doebert, S., Doytchinov, I., Draper, M., Ramos, F. Duarte, Duquenne, M., Plaja, N. Egidos, Elsener, K., Esberg, J., Esposito, M., Evans, L., Fedosseev, V., Ferracin, P., Fiergolski, A., Foraz, K., Fowler, A., Friebel, F., Fuchs, J-F., Gaddi, A., Gamba, D., Fajardo, L. Garcia, Morales, H. Garcia, Garion, C., Gasior, M., Gatignon, L., Gayde, J-C., Gerbershagen, A., Gerwig, H., Giambelli, G., Gilardi, A., Goldblatt, A. N., Anton, S. Gonzalez, Grefe, C., Grudiev, A., Guerin, H., Guillot-Vignot, F. G., Gutt-Mostowy, M. L., Lutz, M. Hein, Hessler, C., Holma, J. K., Holzer, E. B., Hourican, M., Hynds, D., Ikarios, E., Levinsen, Y. Inntjore, Janssens, S., Jeff, A., Jensen, E., Jonker, M., Kamugasa, S. W., Kastriotou, M., Kemppinen, J. M. K., Khan, V., Kieffer, R. B., Klempt, W., Kokkinis, N., Kossyvakis, I., Kostka, Z., Korsback, A., Platia, E. Koukovini, Kovermann, J. W., Kozsar, C-I., Kremastiotis, I., Kröger, J., Kulis, S., Latina, A., Leaux, F., Lebrun, P., Lefevre, T., Leogrande, E., Linssen, L., Liu, X., Cudie, X. Llopart, Magnoni, S., Maidana, C., Maier, A. A., Durand, H. Mainaud, Mallows, S., Manosperti, E., Marelli, C., Lacoma, E. Marin, Marsh, S., Martin, R., Martini, I., Martyanov, M., Mazzoni, S., Mcmonagle, G., Mether, L. M., Meynier, C., Modena, M., Moilanen, A., Mondello, R., Cabral, P. B. Moniz, Irazabal, N. Mouriz, Munker, M., Muranaka, T., Nadenau, J., Navarro, J. G., Quirante, J. L. Navarro, Del Busto, E. Nebo, Nikiforou, N., Ninin, P., Nonis, M., Nisbet, D., Nuiry, F. X., Nürnberg, A., Ögren, J., Osborne, J., Ouniche, A. C., Pan, R., Papadopoulou, S., Papaphilippou, Y., Paraskaki, G., Pastushenko, A., Passarelli, A., Patecki, M., Pazdera, L., Pellegrini, D., Pepitone, K., Codina, E. Perez, Fontenla, A. Perez, Persson, T. H. B., Petrič, M., Pitman, S., Pitters, F., Pittet, S., Plassard, F., Popescu, D., Quast, T., Rajamak, R., Redford, S., Remandet, L., Renier, Y., Rey, S. F., Orozco, O. Rey, Riddone, G., Castro, E. Rodriguez, Roloff, P., Rossi, C., Rossi, F., Rude, V., Ruehl, I., Rumolo, G., Sailer, A., Sandomierski, J., Santin, E., Sanz, C., Bedolla, J. Sauza, Schnoor, U., Schmickler, H., Schulte, D., Senes, E., Serpico, C., Severino, G., Shipman, N., Sicking, E., Simoniello, R., Skowronski, P. K., Mompean, P. Sobrino, Soby, L., Sollander, P., Solodko, A., Sosin, M. P., Spannagel, S., Sroka, S., Stapnes, S., Sterbini, G., Stern, G., Ström, R., Stuart, M. J., Syratchev, I., Szypula, K., Tecker, F., Thonet, P. A., Thrane, P., Timeo, L., Tiirakari, M., Garcia, R. Tomas, Tomoiaga, C. I., Valerio, P., Vaňát, T., Vamvakas, A. L., Van Hoorne, J., Viazlo, O., Pinto, M. Vicente Barreto, Vitoratou, N., Vlachakis, V., Weber, M. A., Wegner, R., Wendt, M., Widorski, M., Williams, O. E., Williams, M., Woolley, B., Wuensch, W., Wulzer, A., Uythoven, J., Xydou, A., Yang, R., Zelios, A., Zhao, Y., Zisopoulos, P., Benoit, M., Sultan, D M S, Riva, F., Bopp, M., Braun, H. H., Craievich, P., Dehler, M., Garvey, T., Pedrozzi, M., Raguin, J. Y., Rivkin, L., Zennaro, R., Guillaume, S., Rothacher, M., Aksoy, A., Nergiz, Z., Yavas, Ö., Denizli, H., Keskin, U., Oyulmaz, K. Y., Senol, A., Ciftci, A. K., Baturin, V., Karpenko, O., Kholodov, R., Lebed, O., Lebedynskyi, S., Mordyk, S., Musienko, I., Profatilova, Ia., Storizhko, V., Bosley, R. R., Price, T., Watson, M. F., Watson, N. K., Winter, A. G., Goldstein, J., Green, S., Marshall, J. S., Thomson, M. A., Xu, B., You, T., Gillespie, W. A., Spannowsky, M., Beggan, C., Martin, V., Zhang, Y., Protopopescu, D., Robson, A., Apsimon, R. J., Bailey, I., Burt, G. C., Dexter, A. C., Edwards, A. V., Hill, V., Jamison, S., Millar, W. L., Papke, K., Casse, G., Vossebeld, J., Aumeyr, T., Bergamaschi, M., Bobb, L., Bosco, A., Boogert, S., Boorman, G., Cullinan, F., Gibson, S., Karataev, P., Kruchinin, K., Lekomtsev, K., Lyapin, A., Nevay, L., Shields, W., Snuverink, J., Towler, J., Yamakawa, E., Boisvert, V., West, S., Jones, R., Joshi, N., Bett, D., Bodenstein, R. M., Bromwich, T., Burrows, P. N., Christian, G. B., Gohil, C., Korysko, P., Paszkiewicz, J., Perry, C., Ramjiawan, R., Roberts, J., Coates, T., Salvatore, F., Bainbridge, A., Clarke, J. A., Krumpa, N., Shepherd, B. J. A., Walsh, D., Chekanov, S., Demarteau, M., Gai, W., Liu, W., Metcalfe, J., Power, J., Repond, J., Weerts, H., Xia, L., Zupan, J., Wells, J. D., Zhang, Z., Adolphsen, C., Barklow, T., Dolgashev, V., Franzi, M., Graf, N., Hewett, J., Kemp, M., Kononenko, O., Markiewicz, T., Moffeit, K., Neilson, J., Nosochkov, Y., Oriunno, M., Phinney, N., Rizzo, T., Tantawi, S., Wang, J., Weatherford, B., White, G., and Woodley, M.

Subjects
Physics - Accelerator Physics
Abstract

The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear $e^+e^-$ collider under development at CERN. Following the CLIC conceptual design published in 2012, this report provides an overview of the CLIC project, its current status, and future developments. It presents the CLIC physics potential and reports on design, technology, and implementation aspects of the accelerator and the detector. CLIC is foreseen to be built and operated in stages, at centre-of-mass energies of 380 GeV, 1.5 TeV and 3 TeV, respectively. CLIC uses a two-beam acceleration scheme, in which 12 GHz accelerating structures are powered via a high-current drive beam. For the first stage, an alternative with X-band klystron powering is also considered. CLIC accelerator optimisation, technical developments and system tests have resulted in an increased energy efficiency (power around 170 MW) for the 380 GeV stage, together with a reduced cost estimate at the level of 6 billion CHF. The detector concept has been refined using improved software tools. Significant progress has been made on detector technology developments for the tracking and calorimetry systems. A wide range of CLIC physics studies has been conducted, both through full detector simulations and parametric studies, together providing a broad overview of the CLIC physics potential. Each of the three energy stages adds cornerstones of the full CLIC physics programme, such as Higgs width and couplings, top-quark properties, Higgs self-coupling, direct searches, and many precision electroweak measurements. The interpretation of the combined results gives crucial and accurate insight into new physics, largely complementary to LHC and HL-LHC. The construction of the first CLIC energy stage could start by 2026. First beams would be available by 2035, marking the beginning of a broad CLIC physics programme spanning 25-30 years., Comment: 112 pages, 59 figures; published as CERN Yellow Report Monograph Vol. 2/2018; corresponding editors: Philip N. Burrows, Nuria Catalan Lasheras, Lucie Linssen, Marko Petri\v{c}, Aidan Robson, Daniel Schulte, Eva Sicking, Steinar Stapnes

Published
2018
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36. The CLIC Potential for New Physics

Author

de Blas, J., Franceschini, R., Riva, F., Roloff, P., Schnoor, U., Spannowsky, M., Wells, J. D., Wulzer, A., Zupan, J., Alipour-Fard, S., Altmannshofer, W., Azatov, A., Azevedo, D., Baglio, J., Bauer, M., Bishara, F., Blaising, J. -J., Brass, S., Buttazzo, D., Chacko, Z., Craig, N., Cui, Y., Dercks, D., Dev, P. S. Bhupal, Di Luzio, L., Di Vita, S., Durieux, G., Fan, J., Ferreira, P., Frugiuele, C., Fuchs, E., García, I., Ghezzi, M., Greljo, A., Gröber, R., Grojean, C., Gu, J., Hunter, R., Joglekar, A., Kalinowski, J., Kilian, W., Kilic, C., Kotlarski, W., Kucharczyk, M., Leogrande, E., Linssen, L., Liu, D., Liu, Z., Lombardo, D. M., Low, I., Matsedonskyi, O., Marzocca, D., Mimasu, K., Mitov, A., Mitra, M., Mohapatra, R. N., Moortgat-Pick, G., Mühlleitner, M., Najjari, S., Nardecchia, M., Neubert, M., No, J. M., Panico, G., Panizzi, L., Paul, A., Perelló, M., Perez, G., Plascencia, A. D., Pruna, G. M., Redigolo, D., Reece, M., Reuter, J., Riembau, M., Robens, T., Robson, A., Rolbiecki, K., Sailer, A., Sakurai, K., Sala, F., Santos, R., Schlaffer, M., Shim, S. Y., Shuve, B., Simoniello, R., Sokołowska, D., Ström, R., Tait, T. M. P., Tesi, A., Thamm, A., van der Kolk, N., Vantalon, T., Verhaaren, C. B., Vos, M., Watson, N., Weiland, C., Winter, A., Wittbrodt, J., Wojton, T., Xu, B., Yin, Z., Żarnecki, A. F., Zhang, C., and Zhang, Y.

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

The Compact Linear Collider (CLIC) is a mature option for the future of high energy physics. It combines the benefits of the clean environment of $e^+e^-$ colliders with operation at high centre-of-mass energies, allowing to probe scales beyond the reach of the Large Hadron Collider (LHC) for many scenarios of new physics. This places the CLIC project at a privileged spot in between the precision and energy frontiers, with capabilities that will significantly extend knowledge on both fronts at the end of the LHC era. In this report we review and revisit the potential of CLIC to search, directly and indirectly, for physics beyond the Standard Model., Comment: 282 pages, 128 Figures, 55 Tables and 732 citations. Editors: J. de Blas, R. Franceschini, F. Riva, P. Roloff, U. Schnoor, M. Spannowsky, J. D. Wells, A. Wulzer and J. Zupan. Version published in CERN Yellow Report Monographs

Published
2018
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37. Learning new physics efficiently with nonparametric methods

Author

Marco Letizia, Gianvito Losapio, Marco Rando, Gaia Grosso, Andrea Wulzer, Maurizio Pierini, Marco Zanetti, and Lorenzo Rosasco

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

Abstract We present a machine learning approach for model-independent new physics searches. The corresponding algorithm is powered by recent large-scale implementations of kernel methods, nonparametric learning algorithms that can approximate any continuous function given enough data. Based on the original proposal by D’Agnolo and Wulzer (Phys Rev D 99(1):015014, 2019, arXiv:1806.02350 [hep-ph]), the model evaluates the compatibility between experimental data and a reference model, by implementing a hypothesis testing procedure based on the likelihood ratio. Model-independence is enforced by avoiding any prior assumption about the presence or shape of new physics components in the measurements. We show that our approach has dramatic advantages compared to neural network implementations in terms of training times and computational resources, while maintaining comparable performances. In particular, we conduct our tests on higher dimensional datasets, a step forward with respect to previous studies.

Published
2022
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39. Top-Quark Physics at the CLIC Electron-Positron Linear Collider

Author

Abramowicz, H., Tehrani, N. Alipour, Arominski, D., Benhammou, Y., Benoit, M., Blaising, J. -J., Boronat, M., Borysov, O., Bosley, R. R., Jelisavčić, I. Božović, Boyko, I., Brass, S., Brondolin, E., de Renstrom, P. Bruckman, Buckland, M., Burrows, P. N., Chefdeville, M., Chekanov, S., Coates, T., Dannheim, D., Demarteau, M., Denizli, H., Durieux, G., Eigen, G., Elsener, K., Fullana, E., Fuster, J., Gabriel, M., Gaede, F., García, I., Goldstein, J., Lopez, P. Gomis, Graf, C., Green, S., Grefe, C., Grojean, C., Hoang, A., Hynds, D., Joffe, A., Kalinowski, J., Kačarević, G., Kilian, W., van der Kolk, N., Krawczyk, M., Kucharczyk, M., Leogrande, E., Lesiak, T., Levy, A., Levy, I., Linssen, L., Maier, A. A., Makarenko, V., Marshall, J. S., Martin, V., Mateu, V., Matsedonskyi, O., Metcalfe, J., Dumbelović, G. Milutinović, Münker, R. M., Nefedov, Yu., Nowak, K., Nürnberg, A., Pandurović, M., Perelló, M., Codina, E. Perez, Petric, M., Pitters, F., Price, T., Quast, T., Redford, S., Repond, J., Robson, A., Roloff, P., Ros, E., Rozwadowska, K., Ruiz-Jimeno, A., Sailer, A., Salvatore, F., Schnoor, U., Schulte, D., Senol, A., Shelkov, G., Sicking, E., Simon, F., Simoniello, R., Sopicki, P., Spannagel, S., Stapnes, S., Ström, R., Szalay, M., Thomson, M. A., Turbiarz, B., Viazlo, O., Vicente, M., Vila, I., Vos, M., Vossebeld, J., Watson, M. F., Watson, N. K., Weber, M. A., Weerts, H., Wells, J. D., Widl, A., Williams, M., Winter, A. G., Wojtoń, T., Wulzer, A., Xu, B., Xia, L., You, T., Żarnecki, A. F., Zawiejski, L., Zhang, C., Zhang, J., Zhang, Y., Zhang, Z., and Zhemchugov, A.

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

The Compact Linear Collider (CLIC) is a proposed future high-luminosity linear electron-positron collider operating at three energy stages, with nominal centre-of-mass energies: 380 GeV, 1.5 TeV, and 3 TeV. Its aim is to explore the energy frontier, providing sensitivity to physics beyond the Standard Model (BSM) and precision measurements of Standard Model processes with an emphasis on Higgs boson and top-quark physics. The opportunities for top-quark physics at CLIC are discussed in this paper. The initial stage of operation focuses on top-quark pair production measurements, as well as the search for rare flavour-changing neutral current (FCNC) top-quark decays. It also includes a top-quark pair production threshold scan around 350 GeV which provides a precise measurement of the top-quark mass in a well-defined theoretical framework. At the higher-energy stages, studies are made of top-quark pairs produced in association with other particles. A study of ttH production including the extraction of the top Yukawa coupling is presented as well as a study of vector boson fusion (VBF) production, which gives direct access to high-energy electroweak interactions. Operation above 1 TeV leads to more highly collimated jet environments where dedicated methods are used to analyse the jet constituents. These techniques enable studies of the top-quark pair production, and hence the sensitivity to BSM physics, to be extended to higher energies. This paper also includes phenomenological interpretations that may be performed using the results from the extensive top-quark physics programme at CLIC., Comment: 86 pages, accepted for publication in JHEP

Published
2018
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40. Learning New Physics from a Machine

Author

D'Agnolo, Raffaele Tito and Wulzer, Andrea

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

We propose using neural networks to detect data departures from a given reference model, with no prior bias on the nature of the new physics responsible for the discrepancy. The virtues of neural networks as unbiased function approximants make them particularly suited for this task. An algorithm that implements this idea is constructed, as a straightforward application of the likelihood-ratio hypothesis test. The algorithm compares observations with an auxiliary set of reference-distributed events, possibly obtained with a Monte Carlo event generator. It returns a p-value, which measures the compatibility of the reference model with the data. It also identifies the most discrepant phase-space region of the data set, to be selected for further investigation. The most interesting potential applications are model-independent new physics searches, although our approach could also be used to compare the theoretical predictions of different Monte Carlo event generators, or for data validation algorithms. In this work we study the performance of our algorithm on a few simple examples. The results confirm the model-independence of the approach, namely that it displays good sensitivity to a variety of putative signals. Furthermore, we show that the reach does not depend much on whether a favorable signal region is selected based on prior expectations. We identify directions for improvement towards applications to real experimental data sets., Comment: 28 pages, 11 figures

Published
2018
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41. Interpreting top-quark LHC measurements in the standard-model effective field theory

Author

Saavedra, J. A. Aguilar, Degrande, C., Durieux, G., Maltoni, F., Vryonidou, E., Zhang, C., Barducci, D., Brivio, I., Cirigliano, V., Dekens, W., de Vries, J., Englert, C., Fabbrichesi, M., Grojean, C., Haisch, U., Jiang, Y., Kamenik, J., Mangano, M., Marzocca, D., Mereghetti, E., Mimasu, K., Moore, L., Perez, G., Plehn, T., Riva, F., Russell, M., Santiago, J., Schulze, M., Soreq, Y., Tonero, A., Trott, M., Westhoff, S., White, C., Wulzer, A., and Zupan, J.

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

This note proposes common standards and prescriptions for the effective-field-theory interpretation of top-quark measurements at the LHC., Comment: LHC TOP WG note, 10 pages of main text, 5 appendices, 1 figure, 21 tables

Published
2018

42. Electroweak Precision Tests in High-Energy Diboson Processes

Author

Franceschini, Roberto, Panico, Giuliano, Pomarol, Alex, Riva, Francesco, and Wulzer, Andrea

Subjects
High Energy Physics - Phenomenology
Abstract

A promising avenue to perform precision tests of the SM at the LHC is to measure differential cross-sections at high invariant mass, exploiting in this way the growth with the energy of the corrections induced by heavy new physics. We classify the leading growing-with-energy effects in longitudinal diboson and in associated Higgs production processes, showing that they can be encapsulated in four real "high-energy primary" parameters. We assess the reach on these parameters at the LHC and at future hadronic colliders, focusing in particular on the fully leptonic $WZ$ channel that appears particularly promising. The reach is found to be superior to existing constraints by one order of magnitude, providing a test of the SM electroweak sector at the per-mille level, in competition with LEP bounds. Unlike LHC Run-1 bounds, which only apply to new physics effects that are much larger than the SM in the high-energy tail of the distributions, the probe we study applies to a wider class of new physics scenarios where such large departures are not expected., Comment: 35 pages, 8 Figures, Fig.7 corrected

Published
2017
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43. The collider landscape: which collider for establishing the SM instability?

Author

Roberto Franceschini, Alessandro Strumia, and Andrea Wulzer

Subjects
Hierarchy Problem, Higgs Properties, Other Weak Scale BSM Models, Top Quark, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Capabilities of future colliders are usually discussed assuming specific hypothetical new physics. We consider the opposite possibility: that no new physics is accessible, and we want to learn if the unnatural Standard Model is part of a vast landscape. We argue that a main step in this direction would be establishing the possible instability scale of the Higgs potential. This primarily needs reducing the uncertainty on the strong coupling and on the top quark mass. We show that the top quark mass can be measured well enough via a t t ¯ $$ t\overline{t} $$ threshold scan with low 1033 cm −2sec −1 luminosity, that seems achievable at a ‘small’ e + e − collider in the LEP tunnel, or at a muon collider demonstrator.

Published
2022
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44. The CLIC Potential for New Physics

Author

Blas, J de, Franceschini, R, Riva, F, Roloff, P, Schnoor, U, Spannowsky, M, Wells, JD, Wulzer, A, Zupan, J, Alipour-Fard, S, Altmannshofer, W, Azatov, A, Azevedo, D, Baglio, J, Bauer, M, Bishara, F, Blaising, J-J, Brass, S, Buttazzo, D, Chacko, Z, Craig, N, Cui, Y, Dercks, D, Dev, PS Bhupal, Luzio, L Di, Vita, S Di, Durieux, G, Fan, J, Ferreira, P, Frugiuele, C, Fuchs, E, García, I, Ghezzi, M, Greljo, A, Gröber, R, Grojean, C, Gu, J, Hunter, R, Joglekar, A, Kalinowski, J, Kilian, W, Kilic, C, Kotlarski, W, Kucharczyk, M, Leogrande, E, Linssen, L, Liu, D, Liu, Z, Lombardo, DM, Low, I, Matsedonskyi, O, Marzocca, D, Mimasu, K, Mitov, A, Mitra, M, Mohapatra, RN, Moortgat-Pick, G, Mühlleitner, M, Najjari, S, Nardecchia, M, Neubert, M, No, JM, Panico, G, Panizzi, L, Paul, A, Perelló, M, Perez, G, Plascencia, AD, Pruna, GM, Redigolo, D, Reece, M, Reuter, J, Riembau, M, Robens, T, Robson, A, Rolbiecki, K, Sailer, A, Sakurai, K, Sala, F, Santos, R, Schlaffer, M, Shim, SY, Shuve, B, Simoniello, R, Sokołowska, D, Ström, R, Tait, TMP, Tesi, A, Thamm, A, Kolk, N van der, Vantalon, T, Verhaaren, CB, Vos, M, Watson, N, Weiland, C, Winter, A, Wittbrodt, J, Wojton, T, Xu, B, and Yin, Z

Subjects
hep-ph, hep-ex
Abstract

The Compact Linear Collider (CLIC) is a mature option for the future of highenergy physics. It combines the benefits of the clean environment of $e^+e^-$colliders with operation at high centre-of-mass energies, allowing to probescales beyond the reach of the Large Hadron Collider (LHC) for many scenariosof new physics. This places the CLIC project at a privileged spot in betweenthe precision and energy frontiers, with capabilities that will significantlyextend knowledge on both fronts at the end of the LHC era. In this report wereview and revisit the potential of CLIC to search, directly and indirectly,for physics beyond the Standard Model.

Published
2018

45. Learning from radiation at a very high energy lepton collider

Author

Siyu Chen, Alfredo Glioti, Riccardo Rattazzi, Lorenzo Ricci, and Andrea Wulzer

Subjects
Electroweak Precision Physics, Specific BSM Phenomenology, Resummation, SMEFT, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We study the potential of lepton collisions with about 10 TeV center of mass energy to probe Electroweak, Higgs and Top short-distance physics at the 100 TeV scale, pointing out the interplay with the long-distance (100 GeV) phenomenon of Electroweak radiation. On one hand, we find that sufficiently accurate theoretical predictions require the resummed inclusion of radiation effects, which we perform at the double logarithmic order. On the other hand, we notice that short-distance physics does influence the emission of Electroweak radiation. Therefore the investigation of the radiation pattern can enhance the sensitivity to new short-distance physical laws. We illustrate these aspects by studying Effective Field Theory contact interactions in di-fermion and di-boson production, and comparing cross-section measurements that require or that exclude the emission of massive Electroweak bosons. The combination of the two types of measurements is found to enhance the sensitivity to the new interactions. Based on these results, we perform sensitivity projections to Higgs and Top Compositeness and to minimal Z′ new physics scenarios at future muon colliders.

Published
2022
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46. Learning new physics from an imperfect machine

Author

Raffaele Tito D’Agnolo, Gaia Grosso, Maurizio Pierini, Andrea Wulzer, and Marco Zanetti

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

Abstract We show how to deal with uncertainties on the Standard Model predictions in an agnostic new physics search strategy that exploits artificial neural networks. Our approach builds directly on the specific Maximum Likelihood ratio treatment of uncertainties as nuisance parameters for hypothesis testing that is routinely employed in high-energy physics. After presenting the conceptual foundations of our method, we first illustrate all aspects of its implementation and extensively study its performances on a toy one-dimensional problem. We then show how to implement it in a multivariate setup by studying the impact of two typical sources of experimental uncertainties in two-body final states at the LHC.

Published
2022
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47. Diboson Interference Resurrection

Author

Panico, Giuliano, Riva, Francesco, and Wulzer, Andrea

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

High-energy diboson processes at the LHC are potentially powerful indirect probes of heavy new physics, whose effects can be encapsulated in higher-dimensional operators or in modified Standard Model couplings. An obstruction however comes from the fact that leading new physics effects often emerge in diboson helicity amplitudes that are anomalously small in the Standard Model. As such, the formally leading Standard Model/New Physics interference contribution cancels in inclusive measurements. This paper describes a solution to this problem., Comment: 8 pages, 4 figures. v2: References added, minor corrections. v3: Matches published version. v4: Change in the general definition of the decay angles, results unchanged

Published
2017
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48. Setting limits on Effective Field Theories: the case of Dark Matter

Author

Pobbe, F., Wulzer, A., and Zanetti, M.

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

The usage of Effective Field Theories (EFT) for LHC new physics searches is receiving increasing attention. It is thus important to clarify all the aspects related with the applicability of the EFT formalism in the LHC environment, where the large available energy can produce reactions that overcome the maximal range of validity, i.e. the cutoff, of the theory. We show that this does forbid to set rigorous limits on the EFT parameter space through a modified version of the ordinary binned likelihood hypothesis test, which we design and validate. Our limit-setting strategy can be carried on in its full-fledged form by the LHC experimental collaborations, or performed externally to the collaborations, through the Simplified Likelihood approach, by relying on certain approximations. We apply it to the recent CMS mono-jet analysis and derive limits on a Dark Matter (DM) EFT model. DM is selected as a case study because the limited reach on the DM production EFT Wilson coefficient and the structure of the theory suggests that the cutoff might be dangerously low, well within the LHC reach. However our strategy can also be applied to EFT's parametrising the indirect effects of heavy new physics in the Electroweak and Higgs sectors.

Published
2017
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