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New physics in B meson mixing: Future sensitivity and limitations

Charles, Jérôme and Descotes-Genon, Sébastien and Ligeti, Zoltan and Monteil, Stéphane and Papucci, Michele and Trabelsi, Karim and Vale Silva, Luiz (2020) New physics in B meson mixing: Future sensitivity and limitations. Physical Review D, 102 (5). Art. No. 056023. ISSN 2470-0010. doi:10.1103/physrevd.102.056023.

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The mixing of neutral mesons is sensitive to some of the highest scales probed in laboratory experiments. In light of the planned LHCb Upgrade II, a possible upgrade of Belle II, and the broad interest in flavor physics in the tera-Z phase of the proposed FCC-ee program, we study constraints on new physics contributions to B_d and B_s mixings which can be obtained in these benchmark scenarios. We explore the limitations of this program, and identify the measurement of |V_(cb)| as one of the key ingredients in which progress beyond current expectations is necessary to maximize future sensitivity. We speculate on possible solutions to this bottleneck. Given the current tension with the standard model (SM) in semileptonic B decays, we explore how its resolution may impact the search for new physics in mixing. Even if new physics has the same Cabibbo-Kobayashi-Maskawa and loop suppressions of flavor changing processes as the SM, the sensitivity will reach 2 TeV, and it can be much higher if any SM suppressions are lifted. We illustrate the discovery potential of this program.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Charles, Jérôme0000-0002-4858-192X
Descotes-Genon, Sébastien0000-0001-7512-4970
Ligeti, Zoltan0000-0002-4830-5773
Monteil, Stéphane0000-0001-5015-3353
Papucci, Michele0000-0003-0810-0017
Trabelsi, Karim0000-0001-6567-3036
Vale Silva, Luiz0000-0002-7399-3272
Additional Information:© 2020 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. Received 19 June 2020; accepted 28 August 2020; published 28 September 2020. We thank Y. Grossman and A. Poluektov for helpful conversations on γ. We would like to thank all members of the CKMfitter group for suggestions on various aspects of this paper. Z. L. was supported in part by the Office of High Energy Physics of the U.S. Department of Energy under contract No. DE-AC02-05CH11231. M. P. is grateful for the support provided by the Walter Burke Institute for Theoretical Physics. L. V. S. was supported in part by the Spanish Government and ERDF funds from the EU Commission [Grant FPA2017-84445-P] and the Generalitat Valenciana [Grant Prometeo/2017/053].
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-05CH11231
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Spanish GovernmentUNSPECIFIED
European Regional Development Funds (ERDF)UNSPECIFIED
European Research Council (ERC)84445
Generalitat ValencianaPrometeo/2017/053
Issue or Number:5
Record Number:CaltechAUTHORS:20200928-132854491
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105588
Deposited By: Tony Diaz
Deposited On:28 Sep 2020 21:06
Last Modified:16 Nov 2021 18:44

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