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We report the first search for a nonstandard-model resonance decaying into τ pairs in e+e-→μ+μ-τ+τ- events in the 3.6-10 GeV/c2 mass range. We use a 62.8 fb-1 sample of e+e- collisions collected at a center-of-mass energy of 10.58 GeV by the Belle II experiment at the SuperKEKB collider. The analysis probes three different models predicting a spin-1 particle coupling only to the heavier lepton families, a Higgs-like spin-0 particle that couples preferentially to charged leptons (leptophilic scalar), and an axionlike particle, respectively. We observe no evidence for a signal and set exclusion limits at 90% confidence level on the product of cross section and branching fraction into τ pairs, ranging from 0.7 to 24 fb, and on the couplings of these processes. We obtain world-leading constraints on the couplings for the leptophilic scalar model for masses above 6.5 GeV/c2 and for the axionlike particle model over the entire mass range.
Search for a τ+τ- Resonance in e+e-→μ+μ-τ+τ- Events with the Belle II Experiment
Adachi, I;Adamczyk, K;Aggarwal, L;Ahmed, H;Aihara, H;Akopov, N;Aloisio, A;Anh Ky, N;Asner, D M;Atmacan, H;Aushev, T;Aushev, V;Aversano, M;Babu, V;Bae, H;Bahinipati, S;Bambade, P;Banerjee, Sw;Bansal, S;Barrett, M;Baudot, J;Bauer, M;Baur, A;Beaubien, A;Becker, J;Behera, P K;Bennett, J V;Bernieri, E;Bernlochner, F U;Bertacchi, V;Bertemes, M;Bertholet, E;Bessner, M;Bettarini, S;Bhardwaj, V;Bhuyan, B;Bianchi, F;Bilka, T;Bilokin, S;Biswas, D;Bobrov, A;Bodrov, D;Bolz, A;Borah, J;Bozek, A;Bračko, M;Branchini, P;Browder, T E;Budano, A;Bussino, S;Campajola, M;Cao, L;Casarosa, G;Cecchi, C;Cerasoli, J;Chang, M-C;Chang, P;Cheaib, R;Cheema, P;Chekelian, V;Chen, Y Q;Cheon, B G;Chilikin, K;Chirapatpimol, K;Cho, H-E;Cho, K;Cho, S-J;Choi, S-K;Choudhury, S;Cinabro, D;Cochran, J;Corona, L;Cremaldi, L M;Cunliffe, S;Czank, T;Das, S;Dattola, F;De La Cruz-Burelo, E;De La Motte, S A;de Marino, G;De Nardo, G;De Nuccio, M;De Pietro, G;de Sangro, R;Destefanis, M;Dey, S;De Yta-Hernandez, A;Dhamija, R;Di Canto, A;Di Capua, F;Dingfelder, J;Doležal, Z;Domínguez Jiménez, I;Dong, T V;Dorigo, M;Dort, K;Dossett, D;Dreyer, S;Dubey, S;Dujany, G;Ecker, P;Eliachevitch, M;Epifanov, D;Feichtinger, P;Ferber, T;Ferlewicz, D;Fillinger, T;Finck, C;Finocchiaro, G;Fodor, A;Forti, F;Frey, A;Fulsom, B G;Gabrielli, A;Ganiev, E;Garcia-Hernandez, M;Garmash, A;Gaudino, G;Gaur, V;Gaz, A;Gellrich, A;Ghevondyan, G;Ghosh, D;Ghumaryan, H;Giakoustidis, G;Giordano, R;Giri, A;Glazov, A;Gobbo, B;Godang, R;Gogota, O;Goldenzweig, P;Gradl, W;Grammatico, T;Granderath, S;Graziani, E;Greenwald, D;Gruberová, Z;Gu, T;Guan, Y;Gudkova, K;Guilliams, J;Halder, S;Han, Y;Hara, T;Hayasaka, K;Hayashii, H;Hazra, S;Hearty, C;Hedges, M T;Heredia de la Cruz, I;Hernández Villanueva, M;Hershenhorn, A;Higuchi, T;Hill, E C;Hirata, H;Hoek, M;Hohmann, M;Hsu, C-L;Humair, T;Iijima, T;Inami, K;Inguglia, G;Ipsita, N;Ishikawa, A;Ito, S;Itoh, R;Iwasaki, M;Jackson, P;Jacobs, W W;Jaffe, D E;Jang, E-J;Ji, Q P;Jia, S;Jin, Y;Johnson, A;Joo, K K;Junkerkalefeld, H;Kakuno, H;Kaleta, M;Kalita, D;Kaliyar, A B;Kandra, J;Kang, K H;Kang, S;Karl, R;Karyan, G;Kawasaki, T;Keil, F;Ketter, C;Kiesling, C;Kim, C-H;Kim, D Y;Kim, K-H;Kim, Y-K;Kindo, H;Kodyš, P;Koga, T;Kohani, S;Kojima, K;Konno, T;Korobov, A;Korpar, S;Kovalenko, E;Kowalewski, R;Kraetzschmar, T M G;Križan, P;Krokovny, P;Kuhr, T;Kumar, J;Kumar, M;Kumar, R;Kumara, K;Kunigo, T;Kuzmin, A;Kwon, Y-J;Lacaprara, S;Lai, Y-T;Lam, T;Lanceri, L;Lange, J S;Laurenza, M;Lautenbach, K;Leboucher, R;Le Diberder, F R;Leitl, P;Levit, D;Lewis, P M;Li, C;Li, L K;Li, Y B;Libby, J;Lieret, K;Liu, Q Y;Liu, Z Q;Liventsev, D;Longo, S;Lozar, A;Lueck, T;Lyu, C;Ma, Y;Maggiora, M;Maharana, S P;Maiti, R;Maity, S;Manfredi, R;Manoni, E;Manthei, A C;Mantovano, M;Marcantonio, D;Marcello, S;Marinas, C;Martel, L;Martellini, C;Martini, A;Martinov, T;Massaccesi, L;Masuda, M;Matsuda, T;Matsuoka, K;Matvienko, D;Maurya, S K;McKenna, J A;Mehta, R;Merola, M;Metzner, F;Milesi, M;Miller, C;Mirra, M;Miyabayashi, K;Miyake, H;Mizuk, R;Mohanty, G B;Molina-Gonzalez, N;Mondal, S;Moneta, S;Moser, H-G;Mrvar, M;Mussa, R;Nakamura, I;Nakamura, K R;Nakao, M;Nakayama, H;Nakazawa, H;Nakazawa, Y;Narimani Charan, A;Naruki, M;Narwal, D;Natkaniec, Z;Natochii, A;Nayak, L;Nayak, M;Nazaryan, G;Niebuhr, C;Nisar, N K;Nishida, S;Ogawa, S;Ono, H;Onuki, Y;Oskin, P;Otani, F;Pakhlov, P;Pakhlova, G;Paladino, A;Panta, A;Paoloni, E;Pardi, S;Parham, K;Park, J;Park, S-H;Paschen, B;Passeri, A;Patra, S;Paul, S;Pedlar, T K;Peruzzi, I;Peschke, R;Pestotnik, R;Pham, F;Piccolo, M;Piilonen, L E;Pinna Angioni, G;Podesta-Lerma, P L M;Podobnik, T;Pokharel, S;Polat, L;Praz, C;Prell, S;Prencipe, E;Prim, M T;Purwar, H;Rad, N;Rados, P;Raeuber, G;Raiz, S;Ramirez Morales, A;Reif, M;Reiter, S;Remnev, M;Ripp-Baudot, I;Rizzo, G;Rizzuto, L B;Robertson, S H;Rodríguez Pérez, D;Roehrken, M;Roney, J M;Rostomyan, A;Rout, N;Russo, G;Sahoo, D;Sanders, D A;Sandilya, S;Sangal, A;Santelj, L;Sato, Y;Savinov, V;Scavino, B;Schnepf, M;Schueler, J;Schwanda, C;Seino, Y;Selce, A;Senyo, K;Serrano, J;Sevior, M E;Sfienti, C;Shan, W;Sharma, C;Shen, C P;Shi, X D;Shillington, T;Shiu, J-G;Shtol, D;Shwartz, B;Sibidanov, A;Simon, F;Singh, J B;Skorupa, J;Sobie, R J;Sobotzik, M;Soffer, A;Sokolov, A;Solovieva, E;Spataro, S;Spruck, B;Starič, M;Stavroulakis, P;Stefkova, S;Stottler, Z S;Stroili, R;Strube, J;Sue, Y;Sumihama, M;Sumisawa, K;Sutcliffe, W;Suzuki, S Y;Svidras, H;Takahashi, M;Takizawa, M;Tamponi, U;Tanaka, S;Tanida, K;Tanigawa, H;Tenchini, F;Thaller, A;Tiwary, R;Tonelli, D;Torassa, E;Toutounji, N;Trabelsi, K;Tsaklidis, I;Uchida, M;Ueda, I;Uematsu, Y;Uglov, T;Unger, K;Unno, Y;Uno, K;Uno, S;Urquijo, P;Ushiroda, Y;Vahsen, S E;van Tonder, R;Varner, G S;Varvell, K E;Vinokurova, A;Vismaya, V S;Vitale, L;Vobbilisetti, V;Volpe, R;Vossen, A;Wach, B;Wakai, M;Wakeling, H M;Wallner, S;Wang, E;Wang, M-Z;Wang, X L;Wang, Z;Warburton, A;Watanabe, M;Watanuki, S;Welsch, M;Wessel, C;Won, E;Xu, X P;Yabsley, B D;Yamada, S;Yan, W;Yang, S B;Ye, H;Yelton, J;Yin, J H;Yook, Y M;Yoshihara, K;Yuan, C Z;Yusa, Y;Zani, L;Zhai, Y;Zhang, Y;Zhilich, V;Zhou, J S;Zhou, Q D;Zhou, X Y;Zhukova, V I;Žlebčík, R
2023-01-01
Abstract
We report the first search for a nonstandard-model resonance decaying into τ pairs in e+e-→μ+μ-τ+τ- events in the 3.6-10 GeV/c2 mass range. We use a 62.8 fb-1 sample of e+e- collisions collected at a center-of-mass energy of 10.58 GeV by the Belle II experiment at the SuperKEKB collider. The analysis probes three different models predicting a spin-1 particle coupling only to the heavier lepton families, a Higgs-like spin-0 particle that couples preferentially to charged leptons (leptophilic scalar), and an axionlike particle, respectively. We observe no evidence for a signal and set exclusion limits at 90% confidence level on the product of cross section and branching fraction into τ pairs, ranging from 0.7 to 24 fb, and on the couplings of these processes. We obtain world-leading constraints on the couplings for the leptophilic scalar model for masses above 6.5 GeV/c2 and for the axionlike particle model over the entire mass range.
Adachi, I; Adamczyk, K; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh Ky, N; Asner, D M; Atmacan, H; Aushev, T; Aushev, V; Aversano, M; Babu, V; Bae, H; Bahinipati, S; Bambade, P; Banerjee, Sw; Bansal, S; Barrett, M; Baudot, J; Bauer, M; Baur, A; Beaubien, A; Becker, J; Behera, P K; Bennett, J V; Bernieri, E; Bernlochner, F U; Bertacchi, V; Bertemes, M; Bertholet, E; Bessner, M; Bettarini, S; Bhardwaj, V; Bhuyan, B; Bianchi, F; Bilka, T; Bilokin, S; Biswas, D; Bobrov, A; Bodrov, D; Bolz, A; Borah, J; Bozek, A; Bračko, M; Branchini, P; Browder, T E; Budano, A; Bussino, S; Campajola, M; Cao, L; Casarosa, G; Cecchi, C; Cerasoli, J; Chang, M-C; Chang, P; Cheaib, R; Cheema, P; Chekelian, V; Chen, Y Q; Cheon, B G; Chilikin, K; Chirapatpimol, K; Cho, H-E; Cho, K; Cho, S-J; Choi, S-K; Choudhury, S; Cinabro, D; Cochran, J; Corona, L; Cremaldi, L M; Cunliffe, S; Czank, T; Das, S; Dattola, F; De La Cruz-Burelo, E; De La Motte, S A; de Marino, G; De Nardo, G; De Nuccio, M; De Pietro, G; de Sangro, R; Destefanis, M; Dey, S; De Yta-Hernandez, A; Dhamija, R; Di Canto, A; Di Capua, F; Dingfelder, J; Doležal, Z; Domínguez Jiménez, I; Dong, T V; Dorigo, M; Dort, K; Dossett, D; Dreyer, S; Dubey, S; Dujany, G; Ecker, P; Eliachevitch, M; Epifanov, D; Feichtinger, P; Ferber, T; Ferlewicz, D; Fillinger, T; Finck, C; Finocchiaro, G; Fodor, A; Forti, F; Frey, A; Fulsom, B G; Gabrielli, A; Ganiev, E; Garcia-Hernandez, M; Garmash, A; Gaudino, G; Gaur, V; Gaz, A; Gellrich, A; Ghevondyan, G; Ghosh, D; Ghumaryan, H; Giakoustidis, G; Giordano, R; Giri, A; Glazov, A; Gobbo, B; Godang, R; Gogota, O; Goldenzweig, P; Gradl, W; Grammatico, T; Granderath, S; Graziani, E; Greenwald, D; Gruberová, Z; Gu, T; Guan, Y; Gudkova, K; Guilliams, J; Halder, S; Han, Y; Hara, T; Hayasaka, K; Hayashii, H; Hazra, S; Hearty, C; Hedges, M T; Heredia de la Cruz, I; Hernández Villanueva, M; Hershenhorn, A; Higuchi, T; Hill, E C; Hirata, H; Hoek, M; Hohmann, M; Hsu, C-L; Humair, T; Iijima, T; Inami, K; Inguglia, G; Ipsita, N; Ishikawa, A; Ito, S; Itoh, R; Iwasaki, M; Jackson, P; Jacobs, W W; Jaffe, D E; Jang, E-J; Ji, Q P; Jia, S; Jin, Y; Johnson, A; Joo, K K; Junkerkalefeld, H; Kakuno, H; Kaleta, M; Kalita, D; Kaliyar, A B; Kandra, J; Kang, K H; Kang, S; Karl, R; Karyan, G; Kawasaki, T; Keil, F; Ketter, C; Kiesling, C; Kim, C-H; Kim, D Y; Kim, K-H; Kim, Y-K; Kindo, H; Kodyš, P; Koga, T; Kohani, S; Kojima, K; Konno, T; Korobov, A; Korpar, S; Kovalenko, E; Kowalewski, R; Kraetzschmar, T M G; Križan, P; Krokovny, P; Kuhr, T; Kumar, J; Kumar, M; Kumar, R; Kumara, K; Kunigo, T; Kuzmin, A; Kwon, Y-J; Lacaprara, S; Lai, Y-T; Lam, T; Lanceri, L; Lange, J S; Laurenza, M; Lautenbach, K; Leboucher, R; Le Diberder, F R; Leitl, P; Levit, D; Lewis, P M; Li, C; Li, L K; Li, Y B; Libby, J; Lieret, K; Liu, Q Y; Liu, Z Q; Liventsev, D; Longo, S; Lozar, A; Lueck, T; Lyu, C; Ma, Y; Maggiora, M; Maharana, S P; Maiti, R; Maity, S; Manfredi, R; Manoni, E; Manthei, A C; Mantovano, M; Marcantonio, D; Marcello, S; Marinas, C; Martel, L; Martellini, C; Martini, A; Martinov, T; Massaccesi, L; Masuda, M; Matsuda, T; Matsuoka, K; Matvienko, D; Maurya, S K; Mckenna, J A; Mehta, R; Merola, M; Metzner, F; Milesi, M; Miller, C; Mirra, M; Miyabayashi, K; Miyake, H; Mizuk, R; Mohanty, G B; Molina-Gonzalez, N; Mondal, S; Moneta, S; Moser, H-G; Mrvar, M; Mussa, R; Nakamura, I; Nakamura, K R; Nakao, M; Nakayama, H; Nakazawa, H; Nakazawa, Y; Narimani Charan, A; Naruki, M; Narwal, D; Natkaniec, Z; Natochii, A; Nayak, L; Nayak, M; Nazaryan, G; Niebuhr, C; Nisar, N K; Nishida, S; Ogawa, S; Ono, H; Onuki, Y; Oskin, P; Otani, F; Pakhlov, P; Pakhlova, G; Paladino, A; Panta, A; Paoloni, E; Pardi, S; Parham, K; Park, J; Park, S-H; Paschen, B; Passeri, A; Patra, S; Paul, S; Pedlar, T K; Peruzzi, I; Peschke, R; Pestotnik, R; Pham, F; Piccolo, M; Piilonen, L E; Pinna Angioni, G; Podesta-Lerma, P L M; Podobnik, T; Pokharel, S; Polat, L; Praz, C; Prell, S; Prencipe, E; Prim, M T; Purwar, H; Rad, N; Rados, P; Raeuber, G; Raiz, S; Ramirez Morales, A; Reif, M; Reiter, S; Remnev, M; Ripp-Baudot, I; Rizzo, G; Rizzuto, L B; Robertson, S H; Rodríguez Pérez, D; Roehrken, M; Roney, J M; Rostomyan, A; Rout, N; Russo, G; Sahoo, D; Sanders, D A; Sandilya, S; Sangal, A; Santelj, L; Sato, Y; Savinov, V; Scavino, B; Schnepf, M; Schueler, J; Schwanda, C; Seino, Y; Selce, A; Senyo, K; Serrano, J; Sevior, M E; Sfienti, C; Shan, W; Sharma, C; Shen, C P; Shi, X D; Shillington, T; Shiu, J-G; Shtol, D; Shwartz, B; Sibidanov, A; Simon, F; Singh, J B; Skorupa, J; Sobie, R J; Sobotzik, M; Soffer, A; Sokolov, A; Solovieva, E; Spataro, S; Spruck, B; Starič, M; Stavroulakis, P; Stefkova, S; Stottler, Z S; Stroili, R; Strube, J; Sue, Y; Sumihama, M; Sumisawa, K; Sutcliffe, W; Suzuki, S Y; Svidras, H; Takahashi, M; Takizawa, M; Tamponi, U; Tanaka, S; Tanida, K; Tanigawa, H; Tenchini, F; Thaller, A; Tiwary, R; Tonelli, D; Torassa, E; Toutounji, N; Trabelsi, K; Tsaklidis, I; Uchida, M; Ueda, I; Uematsu, Y; Uglov, T; Unger, K; Unno, Y; Uno, K; Uno, S; Urquijo, P; Ushiroda, Y; Vahsen, S E; van Tonder, R; Varner, G S; Varvell, K E; Vinokurova, A; Vismaya, V S; Vitale, L; Vobbilisetti, V; Volpe, R; Vossen, A; Wach, B; Wakai, M; Wakeling, H M; Wallner, S; Wang, E; Wang, M-Z; Wang, X L; Wang, Z; Warburton, A; Watanabe, M; Watanuki, S; Welsch, M; Wessel, C; Won, E; Xu, X P; Yabsley, B D; Yamada, S; Yan, W; Yang, S B; Ye, H; Yelton, J; Yin, J H; Yook, Y M; Yoshihara, K; Yuan, C Z; Yusa, Y; Zani, L; Zhai, Y; Zhang, Y; Zhilich, V; Zhou, J S; Zhou, Q D; Zhou, X Y; Zhukova, V I; Žlebčík, R
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