{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:GCFFCTZCOP42V2XFSD7H2RVWIX","short_pith_number":"pith:GCFFCTZC","canonical_record":{"source":{"id":"2107.02373","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2021-07-06T03:49:18Z","cross_cats_sorted":[],"title_canon_sha256":"efd64d5f531c3209712c6af8f8d17b7987b8b7f76d14bf726e887c03427fe6f4","abstract_canon_sha256":"8bdd7837f4b1d812700e2e046a9c3dc6f04c48a74e5aa381c183d678ac22a9bb"},"schema_version":"1.0"},"canonical_sha256":"308a514f2273f9aaeae590fe7d46b645fe2c5d6767d3ec471c8f3afc2e2cbee2","source":{"kind":"arxiv","id":"2107.02373","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.02373","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"arxiv_version","alias_value":"2107.02373v3","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.02373","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"pith_short_12","alias_value":"GCFFCTZCOP42","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"pith_short_16","alias_value":"GCFFCTZCOP42V2XF","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"pith_short_8","alias_value":"GCFFCTZC","created_at":"2026-07-05T03:17:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:GCFFCTZCOP42V2XFSD7H2RVWIX","target":"record","payload":{"canonical_record":{"source":{"id":"2107.02373","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2021-07-06T03:49:18Z","cross_cats_sorted":[],"title_canon_sha256":"efd64d5f531c3209712c6af8f8d17b7987b8b7f76d14bf726e887c03427fe6f4","abstract_canon_sha256":"8bdd7837f4b1d812700e2e046a9c3dc6f04c48a74e5aa381c183d678ac22a9bb"},"schema_version":"1.0"},"canonical_sha256":"308a514f2273f9aaeae590fe7d46b645fe2c5d6767d3ec471c8f3afc2e2cbee2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:17:56.393708Z","signature_b64":"IrSLdyELTZAsyRxJlo9bm7dpVJdLg+6xEN60A+Cx0ejhaEa3cHsr9KShTK/NeX7loBwhr24/cR2BAYDM2sS7Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"308a514f2273f9aaeae590fe7d46b645fe2c5d6767d3ec471c8f3afc2e2cbee2","last_reissued_at":"2026-07-05T03:17:56.393222Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:17:56.393222Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.02373","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:17:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jvrydWZefWlaWnmCElnEcR2oJ6ogaVvJ5LmBvRTCHYbTM0NVt3q2268S7V8Iawq9o2glzbyhYqeMH4pUU0GKAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T11:42:29.158518Z"},"content_sha256":"3c4686ad9944f3266af75e5771763e959ee7c55bf3dd58d61b10e0bda2108b18","schema_version":"1.0","event_id":"sha256:3c4686ad9944f3266af75e5771763e959ee7c55bf3dd58d61b10e0bda2108b18"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:GCFFCTZCOP42V2XFSD7H2RVWIX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement of the branching fraction for $B^{0} \\rightarrow \\pi^{0} \\pi^{0}$ decays reconstructed in 2019-2020 Belle II data","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Aloisio, A. Beaulieu, A. B. Kaliyar, A. Bobrov, A. Bondar, A. Bozek, A. Budano, A. De Yta-Hernandez, A. Di Canto, A. Fodor, A. Frey, A. Garmash, A. Gaz, A. Gellrich, A. Giri, A. Glazov, A. Hershenhorn, A. Ishikawa, A. J. Schwartz, A. Korobov, A. Kuzmin, A. Loos, A. Martini, A. M. Bakich, A. Natochii, A. Paladino, A. Panta, A. Passeri, A. Pathak, A. Rostomyan, A. Sangal, A. Selce, A. Sibidanov, A. Soffer, A. Sokolov, A. Vinokurova, A. Vossen, A. Warburton, A. Zupanc, B. Bhuyan, B. Deschamps, B. D. Yabsley, Belle II Collaboration, B. G. Cheon, B. G. Fulsom, B. Gobbo, B. Golob, B. H. Kim, B. Kirby, B. Knysh, B. Oberhof, B. Paschen, B. Scavino, B. Schwenker, B. Shwartz, B. Spruck, B. Wach, B. Wang, C. Cecchi, C. Chen, C. Hadjivasiliou, C. Hearty, C.-H. Kim, C.-H. Li, C. H. Wang, C. Joo, C. Ketter, C. Kiesling, C. Kleinwort, C. La Licata, C.-L. Hsu, C. Li, C. Lyu, C. MacQueen, C. Marinas, C. Miller, C. Murphy, C. Niebuhr, C. Praz, C. P. Shen, C. Rosenfeld, C. Schwanda, C. Sfienti, C. Wessel, C. Z. Yuan, D. A. Sanders, D. Biswas, D. Cinabro, D. Cuesta, D. Dossett, D. E. Jaffe, D. Epifanov, D. Ferlewicz, D. Getzkow, D. Greenwald, D. J. Summers, D. Levit, D. Liventsev, D. M. Asner, D. Matvienko, D. N. Brown, D. Neverov, D. Rodr\\'iguez P\\'erez, D. Sahoo, D. Tonelli, D. \\v{C}ervenkov, D. Y. Kim, E. Bernieri, E. Bertholet, E. C. Hill, E. De La Cruz-Burelo, E. Ganiev, E. Graziani, E.-J. Jang, E. Kovalenko, E. Manoni, E. Nakano, E. Paoloni, E. Prencipe, E. R. Oxford, E. Solovieva, E. Torassa, E. Waheed, E. Won, F. Abudin\\'en, F. Ameli, F. Bianchi, F. Dattola, F. Di Capua, F. Forti, F. J. M\\\"uller, F. Krinner, F. Luetticke, F. Meggendorfer, F. Meier, F. Metzner, F. Mueller, F. Pham, F. R. Le Diberder, F. Simon, F. Tenchini, F. U. Bernlochner, G. Batignani, G. B. Mohanty, G. Bonvicini, G. Caria, G. Casarosa, G. de Marino, G. De Nardo, G. De Pietro, G. Dujany, G. Finocchiaro, G. Inguglia, G. Karyan, G. Muroyama, G. Nazaryan, G. Pakhlova, G. Polat, G. Rizzo, G. Russo, G. S. Varner, G. Yuan, H. Aihara, H. Atmacan, H. B. Jeon, H.-E. Cho, H.-G. Moser, H. Hayashii, H. Hirata, H. J. Kim, H. Junkerkalefeld, H. Kakuno, H. Kawai, H. Kichimi, H. Kindo, H. Kr\\\"uger, H. Miyake, H. Miyata, H. Moon, H. M. Wakeling, H. Nakayama, H. Nakazawa, H. Ono, H. Ozaki, H. Park, H. Schreeck, H. Shibuya, H. Svidras, H. Tanigawa, H. Windel, H. Ye, I. Adachi, I. Dom\\'inguez Jim\\'enez, I. Heredia de la Cruz, I. Jaegle, I. Kadenko, I. Komarov, I. Nakamura, I. Peruzzi, I. Ripp-Baudot, I.-S. Lee, I. S. Seong, I. Ueda, I. Yeo, J. A. Mora Grimaldo, J. Baudot, J. Becker, J. B. Singh, J. C. Mei, J. Dingfelder, J. E. Fast, J. F. Krohn, J. Gemmler, J.-G. Shiu, J. H. Yin, J. Irakkathil Jabbar, J. Kahn, J. K. Ahn, J. Kandra, J. Kumar, J. Libby, J. Lin, J. McNeil, J. M. Roney, J. Ninkovic, J. Sasaki, J. Schueler, J. Serrano, J. S. Lange, J. Strube, J. Stypula, J. V. Bennett, J. Webb, J. Wiechczynski, J. Yelton, J. Zhou, J. Z. Zhang, K. Adamczyk, K. Azmi, K. Chilikin, K. Chirapatpimol, K. Cho, K. Dort, K. E. Varvell, K. Gudkova, K. Hara, K. Hayasaka, K. H. Kang, K.-H. Kim, K. Huang, K. Inami, K. Kim, K. Kinoshita, K. K. Joo, K. Kumara, K. Lalwani, K. Lautenbach, K. Lieret, K. Matsuoka, K. Miyabayashi, K. Nakagiri, K. Nishimura, K. Ogawa, K. R. Nakamura, K. Senyo, K. Smith, K. Sumisawa, K. Suzuki, K. Tanida, K. Trabelsi, K. Unger, K. Wan, K. Yoshihara, L. Andricek, L. B. Rizzuto, L. Burmistrov, L. Cao, L. Corona, L. E. Piilonen, L. J. Wu, L. K. Li, L. Lanceri, L. Li Gioi, L. M. Cremaldi, L. Santelj, L. Vitale, L. Zani, M. Barrett, M. Bender, M. Bertemes, M. Bessner, M. Bra\\v{c}ko, M. Campajola, M.-C. Chang, M. De Nuccio, M. Destefanis, M. Eliachevitch, M. E. Sevior, M. Friedl, M. Gabriel, M. Garcia-Hernandez, M. Gelb, M. H. A. Nouxman, M. Hern\\'andez Villanueva, M. Hoek, M. Hohmann, M. Iwasaki, M. Jeandron, M. Kumar, M. K\\\"unzel, M. Laurenza, M. Lubej, M. Maggiora, M. Masuda, M. Merola, M. Milesi, M. Mrvar, M. Nakao, M. Nayak, M. Niiyama, M. Nishimura, M. Piccolo, M. Reif, M. Remnev, M. Ritter, M. Ritzert, M. Rozanska, M. Schram, M. Stari\\v{c}, M. Sumihama, M. Tabata, M. Takahashi, M. Takizawa, M. T. Hedges, M. T. Prim, M. Uchida, M. V. Purohit, M. Watanabe, M. Welsch, M. Yonenaga, M.-Z. Wang, N. Akopov, N. Anh Ky, N. Braun, N. Dash, N. Gabyshev, N. K. Nisar, N. Kovalchuk, N. Rad, N. Rout, N. Taniguchi, N. Tsuzuki, O. Hartbrich, P. Ahlburg, P. Bambade, P. Branchini, P. Chang, P. Fischer, P. Goldenzweig, P. Gomis, P. Grace, P. Jackson, P. J. Laycock, P. Kapusta, P. K. Behera, P. Kody\\v{s}, P. K. Resmi, P. Kri\\v{z}an, P. Krokovny, P. Kvasni\\v{c}ka, P. Leitl, P. L. M. Podesta-Lerma, P. Lu, P. M. Lewis, P. Oskin, P. Pakhlov, P. Rados, P. Sartori, P. Taras, P. Urquijo, P. Wieduwilt, Q. D. Zhou, Q. Y. Liu, R. A. Briere, R. Adak, R. Cheaib, R. de Sangro, R. Garg, R. Giordano, R. Godang, R. Itoh, R. J. Sobie, R. Karl, R. Kroeger, R. Kumar, R. Manfredi, R. Mizuk, R. M. Seddon, R. Mussa, R. Peschke, R. Pestotnik, R. Rasheed, R. Stroili, R. van Tonder, S. Bacher, S. Baehr, S. Bahinipati, S. Bansal, S. Bettarini, S. Bilokin, S. Bussino, S. B. Yang, S. Choudhury, S. C. Lee, S. Cunliffe, S. Dey, S. Di Carlo, S. Dubey, S. Duell, S. Eidelman, S. E. Vahsen, S. Fiore, S. Halder, S. Hazra, S.-H. Kim, S. Hollitt, S.-H. Park, S. H. Robertson, S. Iwata, S.-J. Cho, S. Jia, S.-K. Choi, S. Kohani, S. Korpar, S. Kurz, S. Lacaprara, S. L. Olsen, S. Longo, S. Maity, S. Marcello, S. Nishida, S. Ogawa, S. Pardi, S. Patra, S. Paul, S. Prell, S. Raiz, S. Reiter, S. Sandilya, S. Skambraks, S. Spataro, S. Stefkova, S. Tanaka, S. Uehara, S. Uno, S. Watanuki, Sw. Banerjee, S. Wehle, S. X. Li, S. Yamada, S. Y. Suzuki, T. Aushev, T. Aziz, T. Bilka, T. Czank, T. D. Kimmel, T. E. Browder, T. Ferber, T. Fillinger, T. Ge{\\ss}ler, T. Hara, T. Higuchi, Th. Muller, T. Hotta, T. Humair, T. Iijima, T. Kawasaki, T. Keck, T. Koga, T. Konno, T. K. Pedlar, T. Kuhr, T. Kumita, T. Kunigo, T. Lueck, T. Luo, T. Matsuda, T. M. G. Kraetzschmar, T. Moon, T. Morii, T. Nanut, T. Pang, T. Sumiyoshi, T. Tsuboyama, T. Ueno, T. Uglov, T. V. Dong, T. Yoshinobu, U. Gebauer, U. Tamponi, V. Aulchenko, V. Aushev, V. Babu, V. Bhardwaj, V. Chekelian, V. Gaur, V. I. Zhukova, V. Popov, V. Savinov, V. Shebalin, V. Vorobyev, V. Zhilich, V. Zhulanov, W. Gradl, W. Kuehn, W. Sutcliffe, W. Wan Abdullah, W. W. Jacobs, W. Yan, X. L. Wang, X. P. Xu, X. Y. Zhou, Y. B. Li, Y. Guan, Y. Hu, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. Kato, Y. Kim, Y.-K. Kim, Y. Maeda, Y. M. Yook, Y. Onishchuk, Y. Onuki, Y. Q. Chen, Y. Sakai, Y. Sato, Y. Seino, Y. Soloviev, Y. Tao, Y.-T. Chen, Y.-T. Lai, Y. Unno, Y. Ushiroda, Y. V. Usov, Y. Yusa, Y. Zhang, Z. A. Liu, Z. Dole\\v{z}al, Z. Liptak, Z. Natkaniec, Z. S. Stottler, Z. Zhang","submitted_at":"2021-07-06T03:49:18Z","abstract_excerpt":"We report the first reconstruction of the $B^{0} \\to \\pi^{0} \\pi^{0}$ decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 fb$^{-1}$ of integrated luminosity. We find $14.0^{+6.8}_{-5.6}$ signal decays, corresponding to a significance of 3.4 standard deviations and determine a branching ratio of $\\mathcal{B}(B^{0} \\rightarrow \\pi^{0} \\pi^{0}) = [0.98^{+0.48}_{-0.39} \\pm 0.27] \\times 10^{-6}$. The results agree with previous determinations and contribute important information to an early assessment of detector performance and Belle II's potential for future determi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.02373","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.02373/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:17:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JxKYGGPgj/iOc+UOGgP+2SrFlc/TdH7LPB05mBYBnasZwKo0r8on4iWHWNld27oPdjRiBNoRcq23+mm0pSNVBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T11:42:29.158960Z"},"content_sha256":"a527872dcca40a49c4676ce36794a923b95bc4eeedb240006c7a4fc252782aa7","schema_version":"1.0","event_id":"sha256:a527872dcca40a49c4676ce36794a923b95bc4eeedb240006c7a4fc252782aa7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GCFFCTZCOP42V2XFSD7H2RVWIX/bundle.json","state_url":"https://pith.science/pith/GCFFCTZCOP42V2XFSD7H2RVWIX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GCFFCTZCOP42V2XFSD7H2RVWIX/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-05T11:42:29Z","links":{"resolver":"https://pith.science/pith/GCFFCTZCOP42V2XFSD7H2RVWIX","bundle":"https://pith.science/pith/GCFFCTZCOP42V2XFSD7H2RVWIX/bundle.json","state":"https://pith.science/pith/GCFFCTZCOP42V2XFSD7H2RVWIX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GCFFCTZCOP42V2XFSD7H2RVWIX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:GCFFCTZCOP42V2XFSD7H2RVWIX","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"8bdd7837f4b1d812700e2e046a9c3dc6f04c48a74e5aa381c183d678ac22a9bb","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2021-07-06T03:49:18Z","title_canon_sha256":"efd64d5f531c3209712c6af8f8d17b7987b8b7f76d14bf726e887c03427fe6f4"},"schema_version":"1.0","source":{"id":"2107.02373","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.02373","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"arxiv_version","alias_value":"2107.02373v3","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.02373","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"pith_short_12","alias_value":"GCFFCTZCOP42","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"pith_short_16","alias_value":"GCFFCTZCOP42V2XF","created_at":"2026-07-05T03:17:56Z"},{"alias_kind":"pith_short_8","alias_value":"GCFFCTZC","created_at":"2026-07-05T03:17:56Z"}],"graph_snapshots":[{"event_id":"sha256:a527872dcca40a49c4676ce36794a923b95bc4eeedb240006c7a4fc252782aa7","target":"graph","created_at":"2026-07-05T03:17:56Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2107.02373/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the first reconstruction of the $B^{0} \\to \\pi^{0} \\pi^{0}$ decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 fb$^{-1}$ of integrated luminosity. We find $14.0^{+6.8}_{-5.6}$ signal decays, corresponding to a significance of 3.4 standard deviations and determine a branching ratio of $\\mathcal{B}(B^{0} \\rightarrow \\pi^{0} \\pi^{0}) = [0.98^{+0.48}_{-0.39} \\pm 0.27] \\times 10^{-6}$. The results agree with previous determinations and contribute important information to an early assessment of detector performance and Belle II's potential for future determi","authors_text":"A. Aloisio, A. Beaulieu, A. B. Kaliyar, A. Bobrov, A. Bondar, A. Bozek, A. Budano, A. De Yta-Hernandez, A. Di Canto, A. Fodor, A. Frey, A. Garmash, A. Gaz, A. Gellrich, A. Giri, A. Glazov, A. Hershenhorn, A. Ishikawa, A. J. Schwartz, A. Korobov, A. Kuzmin, A. Loos, A. Martini, A. M. Bakich, A. Natochii, A. Paladino, A. Panta, A. Passeri, A. Pathak, A. Rostomyan, A. Sangal, A. Selce, A. Sibidanov, A. Soffer, A. Sokolov, A. Vinokurova, A. Vossen, A. Warburton, A. Zupanc, B. Bhuyan, B. Deschamps, B. D. Yabsley, Belle II Collaboration, B. G. Cheon, B. G. Fulsom, B. Gobbo, B. Golob, B. H. Kim, B. Kirby, B. Knysh, B. Oberhof, B. Paschen, B. Scavino, B. Schwenker, B. Shwartz, B. Spruck, B. Wach, B. Wang, C. Cecchi, C. Chen, C. Hadjivasiliou, C. Hearty, C.-H. Kim, C.-H. Li, C. H. Wang, C. Joo, C. Ketter, C. Kiesling, C. Kleinwort, C. La Licata, C.-L. Hsu, C. Li, C. Lyu, C. MacQueen, C. Marinas, C. Miller, C. Murphy, C. Niebuhr, C. Praz, C. P. Shen, C. Rosenfeld, C. Schwanda, C. Sfienti, C. Wessel, C. Z. Yuan, D. A. Sanders, D. Biswas, D. Cinabro, D. Cuesta, D. Dossett, D. E. Jaffe, D. Epifanov, D. Ferlewicz, D. Getzkow, D. Greenwald, D. J. Summers, D. Levit, D. Liventsev, D. M. Asner, D. Matvienko, D. N. Brown, D. Neverov, D. Rodr\\'iguez P\\'erez, D. Sahoo, D. Tonelli, D. \\v{C}ervenkov, D. Y. Kim, E. Bernieri, E. Bertholet, E. C. Hill, E. De La Cruz-Burelo, E. Ganiev, E. Graziani, E.-J. Jang, E. Kovalenko, E. Manoni, E. Nakano, E. Paoloni, E. Prencipe, E. R. Oxford, E. Solovieva, E. Torassa, E. Waheed, E. Won, F. Abudin\\'en, F. Ameli, F. Bianchi, F. Dattola, F. Di Capua, F. Forti, F. J. M\\\"uller, F. Krinner, F. Luetticke, F. Meggendorfer, F. Meier, F. Metzner, F. Mueller, F. Pham, F. R. Le Diberder, F. Simon, F. Tenchini, F. U. Bernlochner, G. Batignani, G. B. Mohanty, G. Bonvicini, G. Caria, G. Casarosa, G. de Marino, G. De Nardo, G. De Pietro, G. Dujany, G. Finocchiaro, G. Inguglia, G. Karyan, G. Muroyama, G. Nazaryan, G. Pakhlova, G. Polat, G. Rizzo, G. Russo, G. S. Varner, G. Yuan, H. Aihara, H. Atmacan, H. B. Jeon, H.-E. Cho, H.-G. Moser, H. Hayashii, H. Hirata, H. J. Kim, H. Junkerkalefeld, H. Kakuno, H. Kawai, H. Kichimi, H. Kindo, H. Kr\\\"uger, H. Miyake, H. Miyata, H. Moon, H. M. Wakeling, H. Nakayama, H. Nakazawa, H. Ono, H. Ozaki, H. Park, H. Schreeck, H. Shibuya, H. Svidras, H. Tanigawa, H. Windel, H. Ye, I. Adachi, I. Dom\\'inguez Jim\\'enez, I. Heredia de la Cruz, I. Jaegle, I. Kadenko, I. Komarov, I. Nakamura, I. Peruzzi, I. Ripp-Baudot, I.-S. Lee, I. S. Seong, I. Ueda, I. Yeo, J. A. Mora Grimaldo, J. Baudot, J. Becker, J. B. Singh, J. C. Mei, J. Dingfelder, J. E. Fast, J. F. Krohn, J. Gemmler, J.-G. Shiu, J. H. Yin, J. Irakkathil Jabbar, J. Kahn, J. K. Ahn, J. Kandra, J. Kumar, J. Libby, J. Lin, J. McNeil, J. M. Roney, J. Ninkovic, J. Sasaki, J. Schueler, J. Serrano, J. S. Lange, J. Strube, J. Stypula, J. V. Bennett, J. Webb, J. Wiechczynski, J. Yelton, J. Zhou, J. Z. Zhang, K. Adamczyk, K. Azmi, K. Chilikin, K. Chirapatpimol, K. Cho, K. Dort, K. E. Varvell, K. Gudkova, K. Hara, K. Hayasaka, K. H. Kang, K.-H. Kim, K. Huang, K. Inami, K. Kim, K. Kinoshita, K. K. Joo, K. Kumara, K. Lalwani, K. Lautenbach, K. Lieret, K. Matsuoka, K. Miyabayashi, K. Nakagiri, K. Nishimura, K. Ogawa, K. R. Nakamura, K. Senyo, K. Smith, K. Sumisawa, K. Suzuki, K. Tanida, K. Trabelsi, K. Unger, K. Wan, K. Yoshihara, L. Andricek, L. B. Rizzuto, L. Burmistrov, L. Cao, L. Corona, L. E. Piilonen, L. J. Wu, L. K. Li, L. Lanceri, L. Li Gioi, L. M. Cremaldi, L. Santelj, L. Vitale, L. Zani, M. Barrett, M. Bender, M. Bertemes, M. Bessner, M. Bra\\v{c}ko, M. Campajola, M.-C. Chang, M. De Nuccio, M. Destefanis, M. Eliachevitch, M. E. Sevior, M. Friedl, M. Gabriel, M. Garcia-Hernandez, M. Gelb, M. H. A. Nouxman, M. Hern\\'andez Villanueva, M. Hoek, M. Hohmann, M. Iwasaki, M. Jeandron, M. Kumar, M. K\\\"unzel, M. Laurenza, M. Lubej, M. Maggiora, M. Masuda, M. Merola, M. Milesi, M. Mrvar, M. Nakao, M. Nayak, M. Niiyama, M. Nishimura, M. Piccolo, M. Reif, M. Remnev, M. Ritter, M. Ritzert, M. Rozanska, M. Schram, M. Stari\\v{c}, M. Sumihama, M. Tabata, M. Takahashi, M. Takizawa, M. T. Hedges, M. T. Prim, M. Uchida, M. V. Purohit, M. Watanabe, M. Welsch, M. Yonenaga, M.-Z. Wang, N. Akopov, N. Anh Ky, N. Braun, N. Dash, N. Gabyshev, N. K. Nisar, N. Kovalchuk, N. Rad, N. Rout, N. Taniguchi, N. Tsuzuki, O. Hartbrich, P. Ahlburg, P. Bambade, P. Branchini, P. Chang, P. Fischer, P. Goldenzweig, P. Gomis, P. Grace, P. Jackson, P. J. Laycock, P. Kapusta, P. K. Behera, P. Kody\\v{s}, P. K. Resmi, P. Kri\\v{z}an, P. Krokovny, P. Kvasni\\v{c}ka, P. Leitl, P. L. M. Podesta-Lerma, P. Lu, P. M. Lewis, P. Oskin, P. Pakhlov, P. Rados, P. Sartori, P. Taras, P. Urquijo, P. Wieduwilt, Q. D. Zhou, Q. Y. Liu, R. A. Briere, R. Adak, R. Cheaib, R. de Sangro, R. Garg, R. Giordano, R. Godang, R. Itoh, R. J. Sobie, R. Karl, R. Kroeger, R. Kumar, R. Manfredi, R. Mizuk, R. M. Seddon, R. Mussa, R. Peschke, R. Pestotnik, R. Rasheed, R. Stroili, R. van Tonder, S. Bacher, S. Baehr, S. Bahinipati, S. Bansal, S. Bettarini, S. Bilokin, S. Bussino, S. B. Yang, S. Choudhury, S. C. Lee, S. Cunliffe, S. Dey, S. Di Carlo, S. Dubey, S. Duell, S. Eidelman, S. E. Vahsen, S. Fiore, S. Halder, S. Hazra, S.-H. Kim, S. Hollitt, S.-H. Park, S. H. Robertson, S. Iwata, S.-J. Cho, S. Jia, S.-K. Choi, S. Kohani, S. Korpar, S. Kurz, S. Lacaprara, S. L. Olsen, S. Longo, S. Maity, S. Marcello, S. Nishida, S. Ogawa, S. Pardi, S. Patra, S. Paul, S. Prell, S. Raiz, S. Reiter, S. Sandilya, S. Skambraks, S. Spataro, S. Stefkova, S. Tanaka, S. Uehara, S. Uno, S. Watanuki, Sw. Banerjee, S. Wehle, S. X. Li, S. Yamada, S. Y. Suzuki, T. Aushev, T. Aziz, T. Bilka, T. Czank, T. D. Kimmel, T. E. Browder, T. Ferber, T. Fillinger, T. Ge{\\ss}ler, T. Hara, T. Higuchi, Th. Muller, T. Hotta, T. Humair, T. Iijima, T. Kawasaki, T. Keck, T. Koga, T. Konno, T. K. Pedlar, T. Kuhr, T. Kumita, T. Kunigo, T. Lueck, T. Luo, T. Matsuda, T. M. G. Kraetzschmar, T. Moon, T. Morii, T. Nanut, T. Pang, T. Sumiyoshi, T. Tsuboyama, T. Ueno, T. Uglov, T. V. Dong, T. Yoshinobu, U. Gebauer, U. Tamponi, V. Aulchenko, V. Aushev, V. Babu, V. Bhardwaj, V. Chekelian, V. Gaur, V. I. Zhukova, V. Popov, V. Savinov, V. Shebalin, V. Vorobyev, V. Zhilich, V. Zhulanov, W. Gradl, W. Kuehn, W. Sutcliffe, W. Wan Abdullah, W. W. Jacobs, W. Yan, X. L. Wang, X. P. Xu, X. Y. Zhou, Y. B. Li, Y. Guan, Y. Hu, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. Kato, Y. Kim, Y.-K. Kim, Y. Maeda, Y. M. Yook, Y. Onishchuk, Y. Onuki, Y. Q. Chen, Y. Sakai, Y. Sato, Y. Seino, Y. Soloviev, Y. Tao, Y.-T. Chen, Y.-T. Lai, Y. Unno, Y. Ushiroda, Y. V. Usov, Y. Yusa, Y. Zhang, Z. A. Liu, Z. Dole\\v{z}al, Z. Liptak, Z. Natkaniec, Z. S. Stottler, Z. Zhang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2021-07-06T03:49:18Z","title":"Measurement of the branching fraction for $B^{0} \\rightarrow \\pi^{0} \\pi^{0}$ decays reconstructed in 2019-2020 Belle II data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.02373","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:3c4686ad9944f3266af75e5771763e959ee7c55bf3dd58d61b10e0bda2108b18","target":"record","created_at":"2026-07-05T03:17:56Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"8bdd7837f4b1d812700e2e046a9c3dc6f04c48a74e5aa381c183d678ac22a9bb","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2021-07-06T03:49:18Z","title_canon_sha256":"efd64d5f531c3209712c6af8f8d17b7987b8b7f76d14bf726e887c03427fe6f4"},"schema_version":"1.0","source":{"id":"2107.02373","kind":"arxiv","version":3}},"canonical_sha256":"308a514f2273f9aaeae590fe7d46b645fe2c5d6767d3ec471c8f3afc2e2cbee2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"308a514f2273f9aaeae590fe7d46b645fe2c5d6767d3ec471c8f3afc2e2cbee2","first_computed_at":"2026-07-05T03:17:56.393222Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:17:56.393222Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IrSLdyELTZAsyRxJlo9bm7dpVJdLg+6xEN60A+Cx0ejhaEa3cHsr9KShTK/NeX7loBwhr24/cR2BAYDM2sS7Dw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:17:56.393708Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.02373","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3c4686ad9944f3266af75e5771763e959ee7c55bf3dd58d61b10e0bda2108b18","sha256:a527872dcca40a49c4676ce36794a923b95bc4eeedb240006c7a4fc252782aa7"],"state_sha256":"c93726de146f88584563071adff61f7eda57a73dbbe2fb10116a041c2c9e7ec1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EEo9a5BfPj0Egq353wQWGsBd6jRinCIMHcbIdtE6yNe4PfGnKvycKI9Snh84uSHlaIXH5oMvLA0YaU7b2zlMCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T11:42:29.161147Z","bundle_sha256":"a7cd48ced42c2505f906e9dd1e7ecbce339cb1088fc26508ffe3739d3ae5c3f0"}}