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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.14827 |
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| _version_ | 1866915120794304512 |
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| author | Ahn, Jung Keun Antonelli, Antonella Anzivino, Giuseppina Augustine, Emile Bandiera, Laura Bian, Jianming Brizioli, Francesco De Capua, Stefano Carini, Gabriella Chobanova, Veronika D'Ambrosio, Giancarlo Dainton, John Bourke Dőbrich, Babette Fry, John Gianoli, Alberto Glazov, Alexander Gonzalez, Mario Gorbahn, Martin Goudzovski, Evgueni Homma, Mei Hsiung, Yee B. Husek, Tomáš Hutchcroft, David Iyer, Abhishek Jones, Roger William Lewis Katayama, Mai Kawata, Yuto Kim, Eun-Joo Kim, Chong Komatsubara, Takeshi Kotera, Katsushige Kreps, Michal Lamanna, Gianluca Lazzeroni, Cristina Lezki, Samet Lim, GeiYoub Lim, Sanghoon Lin, Chieh Mahmoudi, Farvah Martin, Victoria Massri, Karim Matsumura, Toru Montalto, Luigi Moulson, Matthew Nanjo, Hajime Needham, Matthew Neshatpour, Siavash Nomura, Tadashi Ogawa, Daiki Ono, Keita Pepe, Monica Peruzzo, Letizia Pinzino, Jacopo Protopopescu, Dan Prouve, Claire Reddel, Thomas Redeker, Joseph Rinaldi, Daniele Romagnoni, Marco Romano, Angela Rostomyan, Armine Sanders, Jack Santos, Diego Martínez Sarra, Ivano Shaikhiev, Artur Shiomi, Koji Shiraishi, Ryota Soldani, Mattia Sozzi, Marco Stillwell, Benjamin Su, Yi-Ting Swallow, Joel Tajima, Yasuhisa Tomczak, Adam Tung, Yu-Chen Wah, Yau Wanke, Rainer Watanabe, Hiroaki Wendel, John Wu, Tong Wynd, Maresa Yang, Guang |
| author_facet | Ahn, Jung Keun Antonelli, Antonella Anzivino, Giuseppina Augustine, Emile Bandiera, Laura Bian, Jianming Brizioli, Francesco De Capua, Stefano Carini, Gabriella Chobanova, Veronika D'Ambrosio, Giancarlo Dainton, John Bourke Dőbrich, Babette Fry, John Gianoli, Alberto Glazov, Alexander Gonzalez, Mario Gorbahn, Martin Goudzovski, Evgueni Homma, Mei Hsiung, Yee B. Husek, Tomáš Hutchcroft, David Iyer, Abhishek Jones, Roger William Lewis Katayama, Mai Kawata, Yuto Kim, Eun-Joo Kim, Chong Komatsubara, Takeshi Kotera, Katsushige Kreps, Michal Lamanna, Gianluca Lazzeroni, Cristina Lezki, Samet Lim, GeiYoub Lim, Sanghoon Lin, Chieh Mahmoudi, Farvah Martin, Victoria Massri, Karim Matsumura, Toru Montalto, Luigi Moulson, Matthew Nanjo, Hajime Needham, Matthew Neshatpour, Siavash Nomura, Tadashi Ogawa, Daiki Ono, Keita Pepe, Monica Peruzzo, Letizia Pinzino, Jacopo Protopopescu, Dan Prouve, Claire Reddel, Thomas Redeker, Joseph Rinaldi, Daniele Romagnoni, Marco Romano, Angela Rostomyan, Armine Sanders, Jack Santos, Diego Martínez Sarra, Ivano Shaikhiev, Artur Shiomi, Koji Shiraishi, Ryota Soldani, Mattia Sozzi, Marco Stillwell, Benjamin Su, Yi-Ting Swallow, Joel Tajima, Yasuhisa Tomczak, Adam Tung, Yu-Chen Wah, Yau Wanke, Rainer Watanabe, Hiroaki Wendel, John Wu, Tong Wynd, Maresa Yang, Guang |
| contents | The KOTO II experiment is proposed to measure the branching ratio of the decay $K_L\toπ^0ν\barν$ at J-PARC. With a beamline to extract long-lived neutral kaons at 5 degrees from a production target, the single event sensitivity of the decay is $8.5\times 10^{-13}$, which is much smaller than the Standard Model prediction $3\times 10^{-11}$. This allows searches for new physics beyond the Standard Model and the first discovery of the decay with a significance exceeding $5σ$. As the only experiment proposed in the world dedicated to rare kaon decays, KOTO II will be indispensable in the quest for a complete understanding of flavor dynamics in the quark sector. Moreover, by combining efforts from the kaon community worldwide, we plan to develop the KOTO II detector further and expand the physics reach of the experiment to include measurements of the branching ratio of the $K_L\toπ^0\ell^+\ell^-$ decays, studies of other $K_L$ decays, and searches for dark photons, axions, and axion-like particles. KOTO II will therefore obtain a comprehensive understanding of $K_L$ decays, providing further constraints on new physics scenarios with existing $K^+$ results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_14827 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Proposal of the KOTO II experiment Ahn, Jung Keun Antonelli, Antonella Anzivino, Giuseppina Augustine, Emile Bandiera, Laura Bian, Jianming Brizioli, Francesco De Capua, Stefano Carini, Gabriella Chobanova, Veronika D'Ambrosio, Giancarlo Dainton, John Bourke Dőbrich, Babette Fry, John Gianoli, Alberto Glazov, Alexander Gonzalez, Mario Gorbahn, Martin Goudzovski, Evgueni Homma, Mei Hsiung, Yee B. Husek, Tomáš Hutchcroft, David Iyer, Abhishek Jones, Roger William Lewis Katayama, Mai Kawata, Yuto Kim, Eun-Joo Kim, Chong Komatsubara, Takeshi Kotera, Katsushige Kreps, Michal Lamanna, Gianluca Lazzeroni, Cristina Lezki, Samet Lim, GeiYoub Lim, Sanghoon Lin, Chieh Mahmoudi, Farvah Martin, Victoria Massri, Karim Matsumura, Toru Montalto, Luigi Moulson, Matthew Nanjo, Hajime Needham, Matthew Neshatpour, Siavash Nomura, Tadashi Ogawa, Daiki Ono, Keita Pepe, Monica Peruzzo, Letizia Pinzino, Jacopo Protopopescu, Dan Prouve, Claire Reddel, Thomas Redeker, Joseph Rinaldi, Daniele Romagnoni, Marco Romano, Angela Rostomyan, Armine Sanders, Jack Santos, Diego Martínez Sarra, Ivano Shaikhiev, Artur Shiomi, Koji Shiraishi, Ryota Soldani, Mattia Sozzi, Marco Stillwell, Benjamin Su, Yi-Ting Swallow, Joel Tajima, Yasuhisa Tomczak, Adam Tung, Yu-Chen Wah, Yau Wanke, Rainer Watanabe, Hiroaki Wendel, John Wu, Tong Wynd, Maresa Yang, Guang High Energy Physics - Experiment Instrumentation and Detectors The KOTO II experiment is proposed to measure the branching ratio of the decay $K_L\toπ^0ν\barν$ at J-PARC. With a beamline to extract long-lived neutral kaons at 5 degrees from a production target, the single event sensitivity of the decay is $8.5\times 10^{-13}$, which is much smaller than the Standard Model prediction $3\times 10^{-11}$. This allows searches for new physics beyond the Standard Model and the first discovery of the decay with a significance exceeding $5σ$. As the only experiment proposed in the world dedicated to rare kaon decays, KOTO II will be indispensable in the quest for a complete understanding of flavor dynamics in the quark sector. Moreover, by combining efforts from the kaon community worldwide, we plan to develop the KOTO II detector further and expand the physics reach of the experiment to include measurements of the branching ratio of the $K_L\toπ^0\ell^+\ell^-$ decays, studies of other $K_L$ decays, and searches for dark photons, axions, and axion-like particles. KOTO II will therefore obtain a comprehensive understanding of $K_L$ decays, providing further constraints on new physics scenarios with existing $K^+$ results. |
| title | Proposal of the KOTO II experiment |
| topic | High Energy Physics - Experiment Instrumentation and Detectors |
| url | https://arxiv.org/abs/2501.14827 |