Prospects for searches of b→sννˉb \to s \nu \bar{\nu} decays at FCC-ee

We investigate the physics reach and potential for the study of various decays involving a $b \to s \nu \bar{\nu}$ 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 $b\bar{b}$, $c\bar{c}$ 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 $B^{0} \to K^{*0} \nu \bar{\nu}$, $B^{0}_{s} \to \phi \nu \bar{\nu}$, $B^{0} \to K^{0}_{S} \nu \bar{\nu}$ and $\Lambda_{b}^{0} \to \Lambda^{0} \nu \bar{\nu}$ 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

Prospects for searches of b → sν ν ¯ decays at FCC-ee

We investigate the physics reach and potential for the study of various decays involving a b→sνν¯ 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 bb¯, cc¯ 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 B0→K∗0νν¯, Bs0→ϕνν¯, B0→KS0νν¯ and Λb0→Λνν¯ 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

Prospects for searches of b→sνν‾ b\to s\nu \overline{\nu} decays at FCC-ee

Acknowledgements: 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.Abstract We investigate the physics reach and potential for the study of various decays involving a $$b\to s\nu \overline{\nu}$$ b → sν ν ¯ 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 $$b\overline{b}$$ b b ¯ , $$c\overline{c}$$ c 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 0 → K ∗ 0 ν ν ¯ , $${B}_s^0\to \phi \nu \overline{\nu}$$ B s 0 → ϕν ν ¯ , $${B}^0\to {K}_S^0\nu \overline{\nu}$$ B 0 → K S 0 ν ν ¯ and $${\Lambda}_b^0\to \Lambda \nu \overline{\nu}$$ Λ b 0 → Λ ν ν ¯ 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.</jats:p

Prospects for searches of b → sν ν ¯ decays at FCC-ee

Acknowledgements: 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.We investigate the physics reach and potential for the study of various decays involving a b→sνν¯ 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 bb¯, cc¯ 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 B0→K∗0νν¯, Bs0→ϕνν¯, B0→KS0νν¯ and Λb0→Λνν¯ 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

Prospects for searches of b→sνν‾ b\to s\nu \overline{\nu} decays at FCC-ee

International audienceWe 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

Prospects for searches of b→sνν‾ b\to s\nu \overline{\nu} decays at FCC-ee

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.We investigate the physics reach and potential for the study of various decays involving a $b \to s \nu \bar{\nu}$ 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 $b\bar{b}$, $c\bar{c}$ 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 $B^{0} \to K^{*0} \nu \bar{\nu}$, $B^{0}_{s} \to \phi \nu \bar{\nu}$, $B^{0} \to K^{0}_{S} \nu \bar{\nu}$ and $\Lambda_{b}^{0} \to \Lambda^{0} \nu \bar{\nu}$ 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

Focus topics for the ECFA study on Higgs / Top / EW factories

International audienceIn order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. The general reasoning and the proposed topics are described in this document

Focus topics for the ECFA study on Higgs / Top / EW factories

International audienceIn order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. The general reasoning and the proposed topics are described in this document

Focus topics for the ECFA study on Higgs / Top / EW factories

International audienceIn order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. The general reasoning and the proposed topics are described in this document