The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetry
Abstract Recently, Belle II announced evidence for the decay $$B^+\rightarrow K^+ +\nu +\bar{\nu }$$ B + → K + + ν + ν ¯ at the $$3.5\,\sigma $$ 3.5 σ significance, and measured the corresponding decay branching ratio to be $$2.7\,\sigma $$ 2.7 σ above the Standard Model prediction. Here, we provide...
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2025-01-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-025-13745-6 |
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| author | Zeren Simon Wang Herbert K. Dreiner Julian Y. Günther |
| author_facet | Zeren Simon Wang Herbert K. Dreiner Julian Y. Günther |
| author_sort | Zeren Simon Wang |
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| description | Abstract Recently, Belle II announced evidence for the decay $$B^+\rightarrow K^+ +\nu +\bar{\nu }$$ B + → K + + ν + ν ¯ at the $$3.5\,\sigma $$ 3.5 σ significance, and measured the corresponding decay branching ratio to be $$2.7\,\sigma $$ 2.7 σ above the Standard Model prediction. Here, we provide a theoretical explanation based on a massless bino in R-parity-violating (RPV) supersymmetry. With a single non-vanishing RPV coupling $$\lambda '_{i23/i32}$$ λ i 23 / i 32 ′ , $$\lambda '_{i13/i33}$$ λ i 13 / i 33 ′ , or $$\lambda '_{i12/i22}$$ λ i 12 / i 22 ′ , where $$i=1,2,3$$ i = 1 , 2 , 3 , the decay $$B^+\rightarrow K^+ +\overset{\scriptscriptstyle (-)}{\nu _i}+ \tilde{\chi }^0_1$$ B + → K + + ν i ( - ) + χ ~ 1 0 can be induced, which would lead to the same signature as $$B^+\rightarrow K^+ +\nu +\bar{\nu }$$ B + → K + + ν + ν ¯ . Taking into account both theoretical and experimental uncertainties, we derive the regions of the parameter space spanned by the RPV couplings and sfermion masses that could accommodate the new measurement at various significance levels and obey the existing bounds simultaneously. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
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| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-ce92a4342a5945da8055bded4e2f468b2025-01-26T12:49:13ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522025-01-018511610.1140/epjc/s10052-025-13745-6The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetryZeren Simon Wang0Herbert K. Dreiner1Julian Y. Günther2School of Physics, Hefei University of TechnologyPhysikalisches Institut der Universität Bonn, Bethe Center for Theoretical PhysicsPhysikalisches Institut der Universität Bonn, Bethe Center for Theoretical PhysicsAbstract Recently, Belle II announced evidence for the decay $$B^+\rightarrow K^+ +\nu +\bar{\nu }$$ B + → K + + ν + ν ¯ at the $$3.5\,\sigma $$ 3.5 σ significance, and measured the corresponding decay branching ratio to be $$2.7\,\sigma $$ 2.7 σ above the Standard Model prediction. Here, we provide a theoretical explanation based on a massless bino in R-parity-violating (RPV) supersymmetry. With a single non-vanishing RPV coupling $$\lambda '_{i23/i32}$$ λ i 23 / i 32 ′ , $$\lambda '_{i13/i33}$$ λ i 13 / i 33 ′ , or $$\lambda '_{i12/i22}$$ λ i 12 / i 22 ′ , where $$i=1,2,3$$ i = 1 , 2 , 3 , the decay $$B^+\rightarrow K^+ +\overset{\scriptscriptstyle (-)}{\nu _i}+ \tilde{\chi }^0_1$$ B + → K + + ν i ( - ) + χ ~ 1 0 can be induced, which would lead to the same signature as $$B^+\rightarrow K^+ +\nu +\bar{\nu }$$ B + → K + + ν + ν ¯ . Taking into account both theoretical and experimental uncertainties, we derive the regions of the parameter space spanned by the RPV couplings and sfermion masses that could accommodate the new measurement at various significance levels and obey the existing bounds simultaneously.https://doi.org/10.1140/epjc/s10052-025-13745-6 |
| spellingShingle | Zeren Simon Wang Herbert K. Dreiner Julian Y. Günther The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetry European Physical Journal C: Particles and Fields |
| title | The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetry |
| title_full | The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetry |
| title_fullStr | The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetry |
| title_full_unstemmed | The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetry |
| title_short | The decay $$B\rightarrow K+\nu +\bar{\nu }$$ B → K + ν + ν ¯ at Belle II and a massless bino in R-parity-violating supersymmetry |
| title_sort | decay b rightarrow k nu bar nu b k ν ν ¯ at belle ii and a massless bino in r parity violating supersymmetry |
| url | https://doi.org/10.1140/epjc/s10052-025-13745-6 |
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