Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B08: Muon Collider Symposium IFocus Live Mini-Symposium
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Sponsoring Units: DPB DPF Chair: Nadia Pastrone, INFN |
Saturday, April 17, 2021 10:45AM - 11:21AM Live |
B08.00001: The Case for a Future Muon Collider Invited Speaker: Nathaniel Craig In this talk I'll outline an aspirational theory case for the physics potential of a high-energy muon collider, emphasizing the unique advantages provided by energetic muon beams. I’ll highlight the opportunities for a muon collider to probe a range of beyond-the-Standard Model phenomena including dark matter, naturalness, and the origins of electroweak symmetry breaking, focusing on the energy and luminosity goals that would position such a collider as a natural successor to the LHC and proposed electron-positron Higgs factories. [Preview Abstract] |
Saturday, April 17, 2021 11:21AM - 11:33AM Live |
B08.00002: Simulation of Beam induced Background at Muon Collider and Study of its properties Camilla Curatolo, Donatella Lucchesi, Francesco Collamati, Alessio Mereghetti, Paola Sala, Nikolai Mokhov, Nazar Bartosik, Massimo Casarsa, Sergo Jindariani, Mark Palmer, Simone Pagan Griso, Ron Lipton Muon collider detector performance is critically related to the background produced by muon beam decay through the ring. It is therefore fundamental to contain the beam induced background and to carefully predict its characteristics. A novel simulation tool composed by LineBuilder and Fluka has been developed and the results obtained are benchmarked against the ones obtained by the MAP collaboration via MARS15. We report a detailed study of beam-induced background at few center-of-mass energies and comparison among some possible muon collider configurations. [Preview Abstract] |
Saturday, April 17, 2021 11:33AM - 11:45AM Live |
B08.00003: Physics Object reconstruction optimization at Muon Collider within the ILCSoftware Nazar Bartosik, Paolo Andreetto, Alessio Gianelle, Lorenzo Sestini, Massimo Casarsa, Laura Buonincontri, Chiara Aime', Cristina Riccardi, Federica Legger, Tova Holmes, Paola Sala, Karri DiPetrillo, Christian Herwig, Lesya Anna Horyn, Stefan Spanier The ILCSoft framework, developed for the International Linear Collider and later for CLIC, is now a backbone of the full-simulation studies at a Muon Collider. In contrast to electron-positron colliders, where this framework has been mostly used, a number of computational challenges have to be faced in the Muon Collider environment. The main reason for the increased simulation and reconstruction complexity is the presence of an unprecedented amount of beam-induced background particles arriving to the detector region in a single bunch crossing due to the unstable nature of muons. Performing a full simulation and reconstruction of all the particles is high CPU time consuming, but the distinct temporal and spatial distributions of this background allow to strongly reduce the amount of computation spent on irrelevant object reconstruction. This contribution presents a series of optimisations to the detector simulation workflow, tracker and calorimeter hits digitization as well as track and particle-flow reconstruction sequence taking into account the characteristic properties of the beam-induced background. [Preview Abstract] |
Saturday, April 17, 2021 11:45AM - 11:57AM Live |
B08.00004: WIMPs at High Energy Muon Colliders Zhen Liu, Tao Han, Xing Wang, Lian-Tao Wang The Weakly Interacting Massive Particle (WIMP) paradigm is one of the most compelling scenarios for particle dark matter (DM). We show in this paper that a high energy muon collider can make decisive statements about the WIMP DM, and this should serve as one of its main physics driver cases. We demonstrate this by employing the DM as the lightest member of an electroweak (EW) multiplet, which is simple, yet one of the most challenging WIMP scenarios given its minimal collider signature and high thermal target mass scale of 1 TeV-−23 TeV. We perform a first study of the reach of high energy muon colliders, focusing on the simple, inclusive, and conservative signals with large missing mass, through the mono-photon, VBF di-muon, and a novel mono-muon channel. Using these inclusive signals, it is possible to cover the thermal targets of doublet and triplet with a 10 TeV muon collider. Higher energies, 14 TeV-−75 TeV, would ensure a 5σ reach above the thermal targets for the higher EW multiplets. We also estimate the reach of a search for disappearing tracks, demonstrating the potential significant enhancement of the sensitivity. [Preview Abstract] |
Saturday, April 17, 2021 11:57AM - 12:09PM Live |
B08.00005: Jet Reconstruction performance at Muon Collider with Beam-induced Background Lorenzo Sestini, Donatella Lucchesi, Davide Zuliani, Alessio Gianelle, Paolo Andretto, Laura Buonincontri, Nazar Bartosik, Nadia Pastrone, Massimo Casarsa, Maximilian Swiatlowski, Marco Valente, Ivano Sarra Muon collider is being proposed as next generation facilities, since clean events as in electron-positron colliders are possible, and high collision energy as in hadron colliders could be reached, due to negligible radiation losses. In a multi-TeV muon collider a considerable number of Higgs bosons events can be produced, including double and triple Higgs events, allowing an unprecedented precision for measurements in the Higgs sector. It is evident that the b-jet reconstruction will play an important role in these measurements. The main challenge for the detector is represented by the beam-induced-background produced by muon decays and subsequent interactions with the machine. In this contribution the possible calorimeter technologies that could be employed to face this background and to keep high performance in the jet reconstruction are discussed. Moreover results on the b-jets reconstruction and identification obtained by studying the full simulation of the experiment are presented. [Preview Abstract] |
Saturday, April 17, 2021 12:09PM - 12:21PM Live |
B08.00006: Determination of the double Higgs cross section and trilinear Higgs coupling sensitivities at Muon Collider Laura Buonincontri, Donatella Lucchesi, Camilla Curatolo, Lorenzo Sestini, Sergo Jindariani, Alessio Gianelle, Paolo Andreetto, Nazar Bartosik, Massimo Casarsa, Katherine Pachal, Hannsjoerg Weber, Lawrence Lee, Simone Pagan Griso, Karol Krizka, Maximilian Swiatlowski, Marco Valente A multi-TeV center-of-mass energies muon collider is the ideal machine to study the Higgs boson properties. In fact, in the multi-TeV energies scale the double and triple Higgs boson production rate will be sufficiently high to directly measure the parameters of trilinear and eventually quadrilinear self-couplings, enabling the precise determination of the Higgs boson potential. In this contribution the expected sensitivity of an experiment at muon collider at $\sqrt{s}$ of 3 and 10 TeV on double Higgs production cross section and on the trilinear self-coupling is presented by using the full simulation of the detector and taking into account the effects of the beam-induced background. Signal ($mu^{+} mu^{-} \to HH \nu \bar{nu}$, where H $\to b\bar{b}$) and physics backgrounds processes are fully simulated and reconstructed. Multivariate analysis techniques are used to separate signal from background events and to determine the expected sensitivity on the double Higgs cross section measurement and the trilinear self-coupling confidence interval. [Preview Abstract] |
Saturday, April 17, 2021 12:21PM - 12:33PM Live |
B08.00007: nuSTORM accelerator; challenges and opportunities Jonathan Gall, Jaroslaw Pasternak, Chris Rogers The nuSTORM facility uses a stored muon beam to generate a neutrino source. Muons are captured and stored in a storage ring using stochastic injection. The facility has aims to measure neutrino-nucleus scattering cross sections with uniquely well-characterised neutrino beams; to facilitate the search for sterile neutrino and other Beyond Standard Model processes with exquisite sensitivity; and to provide a muon source that makes an excellent technology test-bed required for the development of muon beams capable of serving as a multi-TeV collider. In this paper, we describe the latest status of the development of nuSTORM, the R&D needs, and the potential role of nuSTORM as a Muon Collider test facility. [Preview Abstract] |
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