Abstract
We investigate the physics reach and potential for the study of various decays involving a \( b\to s\nu \overline{\nu} \) transition at the Future Circular Collider running electron-positron collisions at the Z-pole (FCC-ee). Signal and background candidates, which involve inclusive Z contributions from \( b\overline{b} \), \( c\overline{c} \) and uds final states, are simulated for a proposed multi-purpose detector. Signal candidates are selected using two Boosted Decision Tree algorithms. We determine expected relative sensitivities of 0.53%, 1.20%, 3.37% and 9.86% for the branching fractions of the \( {B}^0\to {K}^{\ast 0}\nu \overline{\nu} \), \( {B}_s^0\to \phi \nu \overline{\nu} \), \( {B}^0\to {K}_S^0\nu \overline{\nu} \) and \( {\Lambda}_b^0\to \Lambda \nu \overline{\nu} \) decays, respectively. In addition, we investigate the impact of detector design choices related to particle-identification and vertex resolution. The phenomenological impact of such measurements on the extraction of Standard Model and new physics parameters is also studied.
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References
LHCb collaboration, Angular analysis of the B0 → K∗0μ+μ− decay using 3 fb−1 of integrated luminosity, JHEP 02 (2016) 104 [arXiv:1512.04442] [INSPIRE].
LHCb collaboration, Measurements of the S-wave fraction in B0 → K+π−μ+μ− decays and the B0 → K∗(892)0μ+μ− differential branching fraction, JHEP 11 (2016) 047 [Erratum ibid. 04 (2017) 142] [arXiv:1606.04731] [INSPIRE].
LHCb collaboration, Branching Fraction Measurements of the Rare \( {B}_s^0\to \phi {\mu}^{+}{\mu}^{-} \) and \( {B}_s^0\to {f}_2^{\prime } \) (1525)μ+μ−-Decays, Phys. Rev. Lett. 127 (2021) 151801 [arXiv:2105.14007] [INSPIRE].
LHCb collaboration, Differential branching fractions and isospin asymmetries of B → K(∗)μ+μ− decays, JHEP 06 (2014) 133 [arXiv:1403.8044] [INSPIRE].
LHCb collaboration, Measurement of CP-Averaged Observables in the B0 → K∗0μ+μ− Decay, Phys. Rev. Lett. 125 (2020) 011802 [arXiv:2003.04831] [INSPIRE].
LHCb collaboration, Angular analysis of charged and neutral B → Kμ+μ− decays, JHEP 05 (2014) 082 [arXiv:1403.8045] [INSPIRE].
LHCb collaboration, Measurement of the phase difference between short- and long-distance amplitudes in the B+ → K+μ+μ− decay, Eur. Phys. J. C 77 (2017) 161 [arXiv:1612.06764] [INSPIRE].
CMS collaboration, Measurement of angular parameters from the decay B0 → K∗0μ+μ− in proton-proton collisions at \( \sqrt{s} \) = 8 TeV, Phys. Lett. B 781 (2018) 517 [arXiv:1710.02846] [INSPIRE].
CMS collaboration, Angular analysis of the decay B+ → K+μ+μ− in proton-proton collisions at \( \sqrt{s} \) = 8 TeV, Phys. Rev. D 98 (2018) 112011 [arXiv:1806.00636] [INSPIRE].
ATLAS collaboration, Angular analysis of \( {B}_d^0\to {K}^{\ast }{\mu}^{+}{\mu}^{-} \) decays in pp collisions at \( \sqrt{s} \) = 8 TeV with the ATLAS detector, JHEP 10 (2018) 047 [arXiv:1805.04000] [INSPIRE].
LHCb collaboration, Test of lepton universality in b → sℓ+ℓ− decays, Phys. Rev. Lett. 131 (2023) 051803 [arXiv:2212.09152] [INSPIRE].
BaBar collaboration, Measurement of Branching Fractions and Rate Asymmetries in the Rare Decays B → K(∗)l+l−, Phys. Rev. D 86 (2012) 032012 [arXiv:1204.3933] [INSPIRE].
Belle collaboration, Lepton-Flavor-Dependent Angular Analysis of B → K∗ℓ+ℓ−, Phys. Rev. Lett. 118 (2017) 111801 [arXiv:1612.05014] [INSPIRE].
BELLE collaboration, Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays, JHEP 03 (2021) 105 [arXiv:1908.01848] [INSPIRE].
Belle collaboration, Test of Lepton-Flavor Universality in B → K∗ℓ+ℓ− Decays at Belle, Phys. Rev. Lett. 126 (2021) 161801 [arXiv:1904.02440] [INSPIRE].
M. Ciuchini et al., Constraints on lepton universality violation from rare B decays, Phys. Rev. D 107 (2023) 055036 [arXiv:2212.10516] [INSPIRE].
N. Gubernari, M. Reboud, D. van Dyk and J. Virto, Improved theory predictions and global analysis of exclusive b → sμ+μ− processes, JHEP 09 (2022) 133 [arXiv:2206.03797] [INSPIRE].
W. Altmannshofer, A.J. Buras, D.M. Straub and M. Wick, New strategies for New Physics search in \( B\to {K}^{\ast}\nu \overline{\nu} \), \( B\to K\nu \overline{\nu} \) and \( B\to {X}_s\nu \overline{\nu} \) decays, JHEP 04 (2009) 022 [arXiv:0902.0160] [INSPIRE].
A.J. Buras, J. Girrbach-Noe, C. Niehoff and D.M. Straub, \( B\to {K}^{\left(\ast \right)}\nu \overline{\nu} \) decays in the Standard Model and beyond, JHEP 02 (2015) 184 [arXiv:1409.4557] [INSPIRE].
D. Bečirević, G. Piazza and O. Sumensari, Revisiting \( B\to {K}^{\left(\ast \right)}\nu \overline{\nu} \) decays in the Standard Model and beyond, Eur. Phys. J. C 83 (2023) 252 [arXiv:2301.06990] [INSPIRE].
J.F. Kamenik and C. Smith, Tree-level contributions to the rare decays \( {B}^{+}\to {\pi}^{+}\nu \overline{\nu} \), \( {B}^{+}\to {K}^{+}\nu \overline{\nu} \), and \( {B}^{+}\to {K}^{\ast +}\nu \overline{\nu} \) in the Standard Model, Phys. Lett. B 680 (2009) 471 [arXiv:0908.1174] [INSPIRE].
G. Buchalla and A.J. Buras, QCD corrections to rare K and B decays for arbitrary top quark mass, Nucl. Phys. B 400 (1993) 225 [INSPIRE].
G. Buchalla and A.J. Buras, The rare decays \( K\to \pi \nu \overline{\nu} \), \( B\to X\nu \overline{\nu} \) and B → l+l−: An Update, Nucl. Phys. B 548 (1999) 309 [hep-ph/9901288] [INSPIRE].
M. Misiak and J. Urban, QCD corrections to FCNC decays mediated by Z penguins and W boxes, Phys. Lett. B 451 (1999) 161 [hep-ph/9901278] [INSPIRE].
J. Brod, M. Gorbahn and E. Stamou, Two-Loop Electroweak Corrections for the \( K\to \pi \nu \overline{\nu} \) Decays, Phys. Rev. D 83 (2011) 034030 [arXiv:1009.0947] [INSPIRE].
Flavour Lattice Averaging Group (FLAG) collaboration, FLAG Review 2021, Eur. Phys. J. C 82 (2022) 869 [arXiv:2111.09849] [INSPIRE].
S. Descotes-Genon, S. Fajfer, J.F. Kamenik and M. Novoa-Brunet, Probing CP violation in exclusive \( b\to s\nu \overline{\nu} \) transitions, Phys. Rev. D 107 (2023) 013005 [arXiv:2208.10880] [INSPIRE].
W. Buchmuller and D. Wyler, Effective Lagrangian Analysis of New Interactions and Flavor Conservation, Nucl. Phys. B 268 (1986) 621 [INSPIRE].
R. Bause, H. Gisbert, M. Golz and G. Hiller, Lepton universality and lepton flavor conservation tests with dineutrino modes, Eur. Phys. J. C 82 (2022) 164 [arXiv:2007.05001] [INSPIRE].
R. Bause, H. Gisbert, M. Golz and G. Hiller, Interplay of dineutrino modes with semileptonic rare B-decays, JHEP 12 (2021) 061 [arXiv:2109.01675] [INSPIRE].
LHCb collaboration, Search for the decays \( {B}_s^0\to {\tau}^{+}{\tau}^{-} \) and B0 → τ+τ−, Phys. Rev. Lett. 118 (2017) 251802 [arXiv:1703.02508] [INSPIRE].
A. Angelescu et al., Single leptoquark solutions to the B-physics anomalies, Phys. Rev. D 104 (2021) 055017 [arXiv:2103.12504] [INSPIRE].
C. Cornella et al., Reading the footprints of the B-meson flavor anomalies, JHEP 08 (2021) 050 [arXiv:2103.16558] [INSPIRE].
Belle-II collaboration, Evidence for \( {B}^{+}\to {K}^{+}\nu \overline{\nu} \) Decays, arXiv:2311.14647 [INSPIRE].
Belle-II collaboration, The Belle II Physics Book, PTEP 2019 (2019) 123C01 [Erratum ibid. 2020 (2020) 029201] [arXiv:1808.10567] [INSPIRE].
Y. Amhis et al., Prospects for \( {B}_c^{+}\to {\tau}^{+}{\nu}_{\tau } \) at FCC-ee, JHEP 12 (2021) 133 [arXiv:2105.13330] [INSPIRE].
Particle Data Group collaboration, Review of Particle Physics, PTEP 2022 (2022) 083C01 [INSPIRE].
C.-H. Chen and C.Q. Geng, Study of \( {\Lambda}_b\to \Lambda \nu \overline{\nu} \) with polarized baryons, Phys. Rev. D 63 (2001) 054005 [hep-ph/0012003] [INSPIRE].
T. Felkl, S.L. Li and M.A. Schmidt, A tale of invisibility: constraints on new physics in b → sνν, JHEP 12 (2021) 118 [arXiv:2111.04327] [INSPIRE].
D. Das, G. Hiller and I. Nisandzic, Revisiting \( B\to {K}^{\ast}\left(\to K\pi \right)\nu \overline{\nu} \) decays, Phys. Rev. D 95 (2017) 073001 [arXiv:1702.07599] [INSPIRE].
P. Böer, T. Feldmann and D. van Dyk, Angular Analysis of the Decay Λb → Λ(→ Nπ)ℓ+ℓ−, JHEP 01 (2015) 155 [arXiv:1410.2115] [INSPIRE].
A.J. Buras and E. Venturini, Searching for New Physics in Rare K and B Decays without |Vcb| and |Vub| Uncertainties, Acta Phys. Polon. B 53 (2021) 6 [arXiv:2109.11032] [INSPIRE].
A.J. Buras and E. Venturini, The exclusive vision of rare K and B decays and of the quark mixing in the standard model, Eur. Phys. J. C 82 (2022) 615 [arXiv:2203.11960] [INSPIRE].
EOS Authors collaboration, EOS: a software for flavor physics phenomenology, Eur. Phys. J. C 82 (2022) 569 [arXiv:2111.15428] [INSPIRE].
D. Van Dyk et al., eos/eos: EOS Version 1.0.10, https://zenodo.org/record/8340859 [https://doi.org/10.5281/ZENODO.8340859].
N. Gubernari, M. Reboud, D. van Dyk and J. Virto, Dispersive analysis of B → K(∗) and Bs → ϕ form factors, JHEP 12 (2023) 153 [arXiv:2305.06301] [INSPIRE].
A. Bharucha, T. Feldmann and M. Wick, Theoretical and Phenomenological Constraints on Form Factors for Radiative and Semi-Leptonic B-Meson Decays, JHEP 09 (2010) 090 [arXiv:1004.3249] [INSPIRE].
J.A. Bailey et al., B → Kl+l− Decay Form Factors from Three-Flavor Lattice QCD, Phys. Rev. D 93 (2016) 025026 [arXiv:1509.06235] [INSPIRE].
HPQCD collaboration, B→K and D→K form factors from fully relativistic lattice QCD, Phys. Rev. D 107 (2023) 014510 [arXiv:2207.12468] [INSPIRE].
R.R. Horgan, Z. Liu, S. Meinel and M. Wingate, Calculation of B0 → K∗0μ+μ− and \( {B}_s^0\to \phi {\mu}^{+}{\mu}^{-} \) observables using form factors from lattice QCD, Phys. Rev. Lett. 112 (2014) 212003 [arXiv:1310.3887] [INSPIRE].
N. Gubernari, A. Kokulu and D. van Dyk, B → P and B → V Form Factors from B-Meson Light-Cone Sum Rules beyond Leading Twist, JHEP 01 (2019) 150 [arXiv:1811.00983] [INSPIRE].
N. Gubernari, D. van Dyk and J. Virto, Non-local matrix elements in B(s) → {K(∗), ϕ}ℓ+ℓ−, JHEP 02 (2021) 088 [arXiv:2011.09813] [INSPIRE].
T. Blake, S. Meinel, M. Rahimi and D. van Dyk, Dispersive bounds for local form factors in Λb → Λ transitions, Phys. Rev. D 108 (2023) 094509 [arXiv:2205.06041] [INSPIRE].
W. Detmold and S. Meinel, Λb → Λℓ+ℓ− form factors, differential branching fraction, and angular observables from lattice QCD with relativistic b quarks, Phys. Rev. D 93 (2016) 074501 [arXiv:1602.01399] [INSPIRE].
FCC collaboration, FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1, Eur. Phys. J. C 79 (2019) 474 [INSPIRE].
FCC collaboration, FCC-ee: the Lepton Collider: Future Circular Collider Conceptual Design Report Volume 2, Eur. Phys. J. ST 228 (2019) 261 [INSPIRE].
P. Bambade et al., The International Linear Collider: a Global Project, arXiv:1903.01629 [INSPIRE].
T. Sjöstrand et al., An introduction to PYTHIA 8.2, Comput. Phys. Commun. 191 (2015) 159 [arXiv:1410.3012] [INSPIRE].
D.J. Lange, The EvtGen particle decay simulation package, Nucl. Instrum. Meth. A 462 (2001) 152 [INSPIRE].
N. Davidson, T. Przedzinski and Z. Was, PHOTOS interface in C++: Technical and Physics Documentation, Comput. Phys. Commun. 199 (2016) 86 [arXiv:1011.0937] [INSPIRE].
C. Helsens et al., HEP-FCC/FCCAnalyses: spring2021_Bc2TauNu, https://zenodo.org/record/4817870 [https://doi.org/10.5281/ZENODO.4817870].
V. Volkl et al., key4hep/EDM4hep: v00-03-02, https://zenodo.org/record/4785063 [https://doi.org/10.5281/ZENODO.4785063].
T. Chen and C. Guestrin, XGBoost: a Scalable Tree Boosting System, in proceedings of the 22nd ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (KDD ’16), New York, NY, U.S.A., (2016) pp. 785–794, arXiv:1603.02754 [https://doi.org/10.1145/2939672.2939785] [INSPIRE].
L. Li, M. Ruan, Y. Wang and Y. Wang, Analysis of \( {B}_s\to \phi \nu \overline{\nu} \) at CEPC, Phys. Rev. D 105 (2022) 114036 [arXiv:2201.07374] [INSPIRE].
R. Aleksan, L. Oliver and E. Perez, Study of CP violation in B± decays to \( \overline{D^0}\left({D}^0\right){K}^{\pm } \) at FCCee, arXiv:2107.05311 [INSPIRE].
P. Athron, R. Martinez and C. Sierra, B meson anomalies and large \( {B}^{+}\to {K}^{+}\nu \overline{\nu} \) in non-universal U(1)′ models, arXiv:2308.13426 [INSPIRE].
R. Bause, H. Gisbert and G. Hiller, Implications of an enhanced \( B\to K\nu \overline{\nu} \) branching ratio, Phys. Rev. D 109 (2024) 015006 [arXiv:2309.00075] [INSPIRE].
L. Allwicher et al., Understanding the first measurement of \( B\left(B\to K\nu \overline{\nu}\right) \), Phys. Lett. B 848 (2024) 138411 [arXiv:2309.02246] [INSPIRE].
T. Felkl, A. Giri, R. Mohanta and M.A. Schmidt, When energy goes missing: new physics in b → sνν with sterile neutrinos, Eur. Phys. J. C 83 (2023) 1135 [arXiv:2309.02940] [INSPIRE].
T. Feldmann and M.W.Y. Yip, Form factors for Λb → Λ transitions in the soft-collinear effective theory, Phys. Rev. D 85 (2012) 014035 [Erratum ibid. 86 (2012) 079901] [arXiv:1111.1844] [INSPIRE].
Acknowledgments
We would like to thank Olcyr Sumensari for his contributions to the early stages of the project as well as Danny van Dyk and Paula Alvarez Cartelle for comments on the manuscript. We would also like to thank Clement Helsens and Donal Hill for their help with setup, simulation and running of the FCC analysis code. We thank the FCC-ee Physics Performance Group for the fruitful discussions and helpful feedback on the analysis procedure and manuscript, in particular Guy Wilkinson, Stephane Monteil, Patrizia Azzi, Emmanuel Perez and Xunwu Zuo. We also thank our colleagues in the Warwick LHCb group for their helpful advice. M.R. thanks Stefan Meinel for the discussion on the future of form factor uncertainties. M.K is supported by the Science and Technology Facilities Council (STFC), UK, under grant #ST/R004536/3 and UK Research and Innovation under grant #EP/X014746/2. A.R.W. is supported by the STFC, UK.
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Amhis, Y., Kenzie, M., Reboud, M. et al. Prospects for searches of \( b\to s\nu \overline{\nu} \) decays at FCC-ee. J. High Energ. Phys. 2024, 144 (2024). https://doi.org/10.1007/JHEP01(2024)144
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DOI: https://doi.org/10.1007/JHEP01(2024)144