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: Using a sample of 4.3×10^{5} η^{'}→ηπ^{0}π^{0} events selected from the ten billion J/ψ event dataset collected with the BESIII detector, we study the decay η^{'}→ηπ^{0}π^{0} within the framework of nonrelativistic effective field theory. Evidence for a structure at π^{+}π^{-} mass threshold is observed in the invariant mass spectrum of π^{0}π^{0} with a statistical significance of around 3.5σ, which is consistent with the cusp effect as predicted by the nonrelativistic effective field theory. After introducing the amplitude for describing the cusp effect, the ππ scattering length combination a_{0}-a_{2} is determined to be 0.226±0.060_{stat}±0.013_{syst}, which is in good agreement with theoretical calculation of 0.2644±0.0051.
Evidence for the Cusp Effect in η' Decays into ηπ^{0}π^{0}
Ablikim, M;Achasov, M N;Adlarson, P;Albrecht, M;Aliberti, R;Amoroso, A;An, M R;An, Q;Bai, X H;Bai, Y;Bakina, O;Baldini Ferroli, R;Balossino, I;Ban, Y;Batozskaya, V;Becker, D;Begzsuren, K;Berger, N;Bertani, M;Bettoni, D;Bianchi, F;Bloms, J;Bortone, A;Boyko, I;Briere, R A;Brueggemann, A;Cai, H;Cai, X;Calcaterra, A;Cao, G F;Cao, N;Cetin, S A;Chang, J F;Chang, W L;Chelkov, G;Chen, C;Chen, Chao;Chen, G;Chen, H S;Chen, M L;Chen, S J;Chen, S M;Chen, T;Chen, X R;Chen, X T;Chen, Y B;Chen, Z J;Cheng, W S;Chu, X;Cibinetto, G;Cossio, F;Cui, J J;Dai, H L;Dai, J P;Dbeyssi, A;de Boer, R E;Dedovich, D;Deng, Z Y;Denig, A;Denysenko, I;Destefanis, M;De Mori, F;Ding, Y;Dong, J;Dong, L Y;Dong, M Y;Dong, X;Du, S X;Egorov, P;Fan, Y L;Fang, J;Fang, S S;Fang, W X;Fang, Y;Farinelli, R;Fava, L;Feldbauer, F;Felici, G;Feng, C Q;Feng, J H;Fischer, K;Fritsch, M;Fritzsch, C;Fu, C D;Gao, H;Gao, Y N;Gao, Yang;Garbolino, S;Garzia, I;Ge, P T;Ge, Z W;Geng, C;Gersabeck, E M;Gilman, A;Goetzen, K;Gong, L;Gong, W X;Gradl, W;Greco, M;Gu, L M;Gu, M H;Gu, Y T;Guan, C Y;Guo, A Q;Guo, L B;Guo, R P;Guo, Y P;Guskov, A;Han, T T;Han, W Y;Hao, X Q;Harris, F A;He, K K;He, K L;Heinsius, F H;Heinz, C H;Heng, Y K;Herold, C;Himmelreich, M;Hou, G Y;Hou, Y R;Hou, Z L;Hu, H M;Hu, J F;Hu, T;Hu, Y;Huang, G S;Huang, K X;Huang, L Q;Huang, L Q;Huang, X T;Huang, Y P;Huang, Z;Hussain, T;Hüsken, N;Imoehl, W;Irshad, M;Jackson, J;Jaeger, S;Janchiv, S;Ji, Q;Ji, Q P;Ji, X B;Ji, X L;Ji, Y Y;Jia, Z K;Jiang, H B;Jiang, S S;Jiang, X S;Jiang, Y;Jiao, J B;Jiao, Z;Jin, S;Jin, Y;Jing, M Q;Johansson, T;Kalantar-Nayestanaki, N;Kang, X L;Kang, X S;Kappert, R;Kavatsyuk, M;Ke, B C;Keshk, I K;Khoukaz, A;Kiese, P;Kiuchi, R;Kliemt, R;Koch, L;Kolcu, O B;Kopf, B;Kuemmel, M;Kuessner, M;Kupsc, A;Kühn, W;Lane, J J;Lange, J S;Larin, P;Lavania, A;Lavezzi, L;Lei, Z H;Leithoff, H;Lellmann, M;Lenz, T;Li, C;Li, C;Li, C H;Li, Cheng;Li, D M;Li, F;Li, G;Li, H;Li, H;Li, H B;Li, H J;Li, H N;Li, J Q;Li, J S;Li, J W;Li, Ke;Li, L J;Li, L K;Li, Lei;Li, M H;Li, P R;Li, S X;Li, S Y;Li, T;Li, W D;Li, W G;Li, X H;Li, X L;Li, Xiaoyu;Liang, H;Liang, H;Liang, H;Liang, Y F;Liang, Y T;Liao, G R;Liao, L Z;Libby, J;Limphirat, A;Lin, C X;Lin, D X;Lin, T;Liu, B J;Liu, C X;Liu, D;Liu, F H;Liu, Fang;Liu, Feng;Liu, G M;Liu, H;Liu, H B;Liu, H M;Liu, Huanhuan;Liu, Huihui;Liu, J B;Liu, J L;Liu, J Y;Liu, K;Liu, K Y;Liu, Ke;Liu, L;Liu, M H;Liu, P L;Liu, Q;Liu, S B;Liu, T;Liu, W K;Liu, W M;Liu, X;Liu, Y;Liu, Y B;Liu, Z A;Liu, Z Q;Lou, X C;Lu, F X;Lu, H J;Lu, J G;Lu, X L;Lu, Y;Lu, Y P;Lu, Z H;Luo, C L;Luo, M X;Luo, T;Luo, X L;Lyu, X R;Lyu, Y F;Ma, F C;Ma, H L;Ma, L L;Ma, M M;Ma, Q M;Ma, R Q;Ma, R T;Ma, X Y;Ma, Y;Maas, F E;Maggiora, M;Maldaner, S;Malde, S;Malik, Q A;Mangoni, A;Mao, Y J;Mao, Z P;Marcello, S;Meng, Z X;Messchendorp, J G;Mezzadri, G;Miao, H;Min, T J;Mitchell, R E;Mo, X H;Muchnoi, N Yu;Nefedov, Y;Nerling, F;Nikolaev, I B;Ning, Z;Nisar, S;Niu, Y;Olsen, S L;Ouyang, Q;Pacetti, S;Pan, X;Pan, Y;Pathak, A;Pathak, A;Pelizaeus, M;Peng, H P;Peters, K;Pettersson, J;Ping, J L;Ping, R G;Plura, S;Pogodin, S;Prasad, V;Qi, F Z;Qi, H;Qi, H R;Qi, M;Qi, T Y;Qian, S;Qian, W B;Qian, Z;Qiao, C F;Qin, J J;Qin, L Q;Qin, X P;Qin, X S;Qin, Z H;Qiu, J F;Qu, S Q;Qu, S Q;Rashid, K H;Redmer, C F;Ren, K J;Rivetti, A;Rodin, V;Rolo, M;Rong, G;Rosner, Ch;Ruan, S N;Sang, H S;Sarantsev, A;Schelhaas, Y;Schnier, C;Schönning, K;Scodeggio, M;Shan, K Y;Shan, W;Shan, X Y;Shangguan, J F;Shao, L G;Shao, M;Shen, C P;Shen, H F;Shen, X Y;Shi, B-A;Shi, H C;Shi, J Y;Shi, Q Q;Shi, R S;Shi, X;Shi, X D;Song, J J;Song, W M;Song, Y X;Sosio, S;Spataro, S;Stieler, F;Su, K X;Su, P P;Su, Y-J;Sun, G X;Sun, H;Sun, H K;Sun, J F;Sun, L;Sun, S S;Sun, T;Sun, W Y;Sun, X;Sun, Y J;Sun, Y Z;Sun, Z T;Tan, Y H;Tan, Y X;Tang, C J;Tang, G Y;Tang, J;Tao, L Y;Tao, Q T;Tat, M;Teng, J X;Thoren, V;Tian, W H;Tian, Y;Uman, I;Wang, B;Wang, B L;Wang, C W;Wang, D Y;Wang, F;Wang, H J;Wang, H P;Wang, K;Wang, L L;Wang, M;Wang, M Z;Wang, Meng;Wang, S;Wang, T;Wang, T J;Wang, W;Wang, W H;Wang, W P;Wang, X;Wang, X F;Wang, X L;Wang, Y D;Wang, Y F;Wang, Y H;Wang, Y Q;Wang, Y Q;Wang, Y;Wang, Z;Wang, Z Y;Wang, Ziyi;Wei, D H;Weidner, F;Wen, S P;White, D J;Wiedner, U;Wilkinson, G;Wolke, M;Wollenberg, L;Wu, J F;Wu, L H;Wu, L J;Wu, X;Wu, X H;Wu, Y;Wu, Z;Xia, L;Xiang, T;Xiao, D;Xiao, G Y;Xiao, H;Xiao, S Y;Xiao, Y L;Xiao, Z J;Xie, C;Xie, X H;Xie, Y;Xie, Y G;Xie, Y H;Xie, Z P;Xing, T Y;Xu, C F;Xu, C J;Xu, G F;Xu, H Y;Xu, Q J;Xu, S Y;Xu, X P;Xu, Y C;Xu, Z P;Yan, F;Yan, L;Yan, W B;Yan, W C;Yang, H J;Yang, H L;Yang, H X;Yang, L;Yang, S L;Yang, Tao;Yang, Y X;Yang, Yifan;Ye, M;Ye, M H;Yin, J H;You, Z Y;Yu, B X;Yu, C X;Yu, G;Yu, T;Yuan, C Z;Yuan, L;Yuan, S C;Yuan, X Q;Yuan, Y;Yuan, Z Y;Yue, C X;Zafar, A A;Zeng, F R;Zeng, X;Zeng, Y;Zhan, Y H;Zhang, A Q;Zhang, B L;Zhang, B X;Zhang, D H;Zhang, G Y;Zhang, H;Zhang, H H;Zhang, H H;Zhang, H Y;Zhang, J L;Zhang, J Q;Zhang, J W;Zhang, J X;Zhang, J Y;Zhang, J Z;Zhang, Jianyu;Zhang, Jiawei;Zhang, L M;Zhang, L Q;Zhang, Lei;Zhang, P;Zhang, Q Y;Zhang, Shulei;Zhang, X D;Zhang, X M;Zhang, X Y;Zhang, X Y;Zhang, Y;Zhang, Y T;Zhang, Y H;Zhang, Yan;Zhang, Yao;Zhang, Z H;Zhang, Z Y;Zhang, Z Y;Zhao, G;Zhao, J;Zhao, J Y;Zhao, J Z;Zhao, Lei;Zhao, Ling;Zhao, M G;Zhao, Q;Zhao, S J;Zhao, Y B;Zhao, Y X;Zhao, Z G;Zhemchugov, A;Zheng, B;Zheng, J P;Zheng, Y H;Zhong, B;Zhong, C;Zhong, X;Zhou, H;Zhou, L P;Zhou, X;Zhou, X K;Zhou, X R;Zhou, X Y;Zhou, Y Z;Zhu, J;Zhu, K;Zhu, K J;Zhu, L X;Zhu, S H;Zhu, S Q;Zhu, T J;Zhu, W J;Zhu, Y C;Zhu, Z A;Zou, B S;Zou, J H
2023-01-01
Abstract
: Using a sample of 4.3×10^{5} η^{'}→ηπ^{0}π^{0} events selected from the ten billion J/ψ event dataset collected with the BESIII detector, we study the decay η^{'}→ηπ^{0}π^{0} within the framework of nonrelativistic effective field theory. Evidence for a structure at π^{+}π^{-} mass threshold is observed in the invariant mass spectrum of π^{0}π^{0} with a statistical significance of around 3.5σ, which is consistent with the cusp effect as predicted by the nonrelativistic effective field theory. After introducing the amplitude for describing the cusp effect, the ππ scattering length combination a_{0}-a_{2} is determined to be 0.226±0.060_{stat}±0.013_{syst}, which is in good agreement with theoretical calculation of 0.2644±0.0051.
Ablikim, M; Achasov, M N; Adlarson, P; Albrecht, M; Aliberti, R; Amoroso, A; An, M R; An, Q; Bai, X H; Bai, Y; Bakina, O; Baldini Ferroli, R; Balossino, I; Ban, Y; Batozskaya, V; Becker, D; Begzsuren, K; Berger, N; Bertani, M; Bettoni, D; Bianchi, F; Bloms, J; Bortone, A; Boyko, I; Briere, R A; Brueggemann, A; Cai, H; Cai, X; Calcaterra, A; Cao, G F; Cao, N; Cetin, S A; Chang, J F; Chang, W L; Chelkov, G; Chen, C; Chen, Chao; Chen, G; Chen, H S; Chen, M L; Chen, S J; Chen, S M; Chen, T; Chen, X R; Chen, X T; Chen, Y B; Chen, Z J; Cheng, W S; Chu, X; Cibinetto, G; Cossio, F; Cui, J J; Dai, H L; Dai, J P; Dbeyssi, A; de Boer, R E; Dedovich, D; Deng, Z Y; Denig, A; Denysenko, I; Destefanis, M; De Mori, F; Ding, Y; Dong, J; Dong, L Y; Dong, M Y; Dong, X; Du, S X; Egorov, P; Fan, Y L; Fang, J; Fang, S S; Fang, W X; Fang, Y; Farinelli, R; Fava, L; Feldbauer, F; Felici, G; Feng, C Q; Feng, J H; Fischer, K; Fritsch, M; Fritzsch, C; Fu, C D; Gao, H; Gao, Y N; Gao, Yang; Garbolino, S; Garzia, I; Ge, P T; Ge, Z W; Geng, C; Gersabeck, E M; Gilman, A; Goetzen, K; Gong, L; Gong, W X; Gradl, W; Greco, M; Gu, L M; Gu, M H; Gu, Y T; Guan, C Y; Guo, A Q; Guo, L B; Guo, R P; Guo, Y P; Guskov, A; Han, T T; Han, W Y; Hao, X Q; Harris, F A; He, K K; He, K L; Heinsius, F H; Heinz, C H; Heng, Y K; Herold, C; Himmelreich, M; Hou, G Y; Hou, Y R; Hou, Z L; Hu, H M; Hu, J F; Hu, T; Hu, Y; Huang, G S; Huang, K X; Huang, L Q; Huang, L Q; Huang, X T; Huang, Y P; Huang, Z; Hussain, T; Hüsken, N; Imoehl, W; Irshad, M; Jackson, J; Jaeger, S; Janchiv, S; Ji, Q; Ji, Q P; Ji, X B; Ji, X L; Ji, Y Y; Jia, Z K; Jiang, H B; Jiang, S S; Jiang, X S; Jiang, Y; Jiao, J B; Jiao, Z; Jin, S; Jin, Y; Jing, M Q; Johansson, T; Kalantar-Nayestanaki, N; Kang, X L; Kang, X S; Kappert, R; Kavatsyuk, M; Ke, B C; Keshk, I K; Khoukaz, A; Kiese, P; Kiuchi, R; Kliemt, R; Koch, L; Kolcu, O B; Kopf, B; Kuemmel, M; Kuessner, M; Kupsc, A; Kühn, W; Lane, J J; Lange, J S; Larin, P; Lavania, A; Lavezzi, L; Lei, Z H; Leithoff, H; Lellmann, M; Lenz, T; Li, C; Li, C; Li, C H; Li, Cheng; Li, D M; Li, F; Li, G; Li, H; Li, H; Li, H B; Li, H J; Li, H N; Li, J Q; Li, J S; Li, J W; Li, Ke; Li, L J; Li, L K; Li, Lei; Li, M H; Li, P R; Li, S X; Li, S Y; Li, T; Li, W D; Li, W G; Li, X H; Li, X L; Li, Xiaoyu; Liang, H; Liang, H; Liang, H; Liang, Y F; Liang, Y T; Liao, G R; Liao, L Z; Libby, J; Limphirat, A; Lin, C X; Lin, D X; Lin, T; Liu, B J; Liu, C X; Liu, D; Liu, F H; Liu, Fang; Liu, Feng; Liu, G M; Liu, H; Liu, H B; Liu, H M; Liu, Huanhuan; Liu, Huihui; Liu, J B; Liu, J L; Liu, J Y; Liu, K; Liu, K Y; Liu, Ke; Liu, L; Liu, M H; Liu, P L; Liu, Q; Liu, S B; Liu, T; Liu, W K; Liu, W M; Liu, X; Liu, Y; Liu, Y B; Liu, Z A; Liu, Z Q; Lou, X C; Lu, F X; Lu, H J; Lu, J G; Lu, X L; Lu, Y; Lu, Y P; Lu, Z H; Luo, C L; Luo, M X; Luo, T; Luo, X L; Lyu, X R; Lyu, Y F; Ma, F C; Ma, H L; Ma, L L; Ma, M M; Ma, Q M; Ma, R Q; Ma, R T; Ma, X Y; Ma, Y; Maas, F E; Maggiora, M; Maldaner, S; Malde, S; Malik, Q A; Mangoni, A; Mao, Y J; Mao, Z P; Marcello, S; Meng, Z X; Messchendorp, J G; Mezzadri, G; Miao, H; Min, T J; Mitchell, R E; Mo, X H; Muchnoi, N Yu; Nefedov, Y; Nerling, F; Nikolaev, I B; Ning, Z; Nisar, S; Niu, Y; Olsen, S L; Ouyang, Q; Pacetti, S; Pan, X; Pan, Y; Pathak, A; Pathak, A; Pelizaeus, M; Peng, H P; Peters, K; Pettersson, J; Ping, J L; Ping, R G; Plura, S; Pogodin, S; Prasad, V; Qi, F Z; Qi, H; Qi, H R; Qi, M; Qi, T Y; Qian, S; Qian, W B; Qian, Z; Qiao, C F; Qin, J J; Qin, L Q; Qin, X P; Qin, X S; Qin, Z H; Qiu, J F; Qu, S Q; Qu, S Q; Rashid, K H; Redmer, C F; Ren, K J; Rivetti, A; Rodin, V; Rolo, M; Rong, G; Rosner, Ch; Ruan, S N; Sang, H S; Sarantsev, A; Schelhaas, Y; Schnier, C; Schönning, K; Scodeggio, M; Shan, K Y; Shan, W; Shan, X Y; Shangguan, J F; Shao, L G; Shao, M; Shen, C P; Shen, H F; Shen, X Y; Shi, B-A; Shi, H C; Shi, J Y; Shi, Q Q; Shi, R S; Shi, X; Shi, X D; Song, J J; Song, W M; Song, Y X; Sosio, S; Spataro, S; Stieler, F; Su, K X; Su, P P; Su, Y-J; Sun, G X; Sun, H; Sun, H K; Sun, J F; Sun, L; Sun, S S; Sun, T; Sun, W Y; Sun, X; Sun, Y J; Sun, Y Z; Sun, Z T; Tan, Y H; Tan, Y X; Tang, C J; Tang, G Y; Tang, J; Tao, L Y; Tao, Q T; Tat, M; Teng, J X; Thoren, V; Tian, W H; Tian, Y; Uman, I; Wang, B; Wang, B L; Wang, C W; Wang, D Y; Wang, F; Wang, H J; Wang, H P; Wang, K; Wang, L L; Wang, M; Wang, M Z; Wang, Meng; Wang, S; Wang, T; Wang, T J; Wang, W; Wang, W H; Wang, W P; Wang, X; Wang, X F; Wang, X L; Wang, Y D; Wang, Y F; Wang, Y H; Wang, Y Q; Wang, Y Q; Wang, Y; Wang, Z; Wang, Z Y; Wang, Ziyi; Wei, D H; Weidner, F; Wen, S P; White, D J; Wiedner, U; Wilkinson, G; Wolke, M; Wollenberg, L; Wu, J F; Wu, L H; Wu, L J; Wu, X; Wu, X H; Wu, Y; Wu, Z; Xia, L; Xiang, T; Xiao, D; Xiao, G Y; Xiao, H; Xiao, S Y; Xiao, Y L; Xiao, Z J; Xie, C; Xie, X H; Xie, Y; Xie, Y G; Xie, Y H; Xie, Z P; Xing, T Y; Xu, C F; Xu, C J; Xu, G F; Xu, H Y; Xu, Q J; Xu, S Y; Xu, X P; Xu, Y C; Xu, Z P; Yan, F; Yan, L; Yan, W B; Yan, W C; Yang, H J; Yang, H L; Yang, H X; Yang, L; Yang, S L; Yang, Tao; Yang, Y X; Yang, Yifan; Ye, M; Ye, M H; Yin, J H; You, Z Y; Yu, B X; Yu, C X; Yu, G; Yu, T; Yuan, C Z; Yuan, L; Yuan, S C; Yuan, X Q; Yuan, Y; Yuan, Z Y; Yue, C X; Zafar, A A; Zeng, F R; Zeng, X; Zeng, Y; Zhan, Y H; Zhang, A Q; Zhang, B L; Zhang, B X; Zhang, D H; Zhang, G Y; Zhang, H; Zhang, H H; Zhang, H H; Zhang, H Y; Zhang, J L; Zhang, J Q; Zhang, J W; Zhang, J X; Zhang, J Y; Zhang, J Z; Zhang, Jianyu; Zhang, Jiawei; Zhang, L M; Zhang, L Q; Zhang, Lei; Zhang, P; Zhang, Q Y; Zhang, Shulei; Zhang, X D; Zhang, X M; Zhang, X Y; Zhang, X Y; Zhang, Y; Zhang, Y T; Zhang, Y H; Zhang, Yan; Zhang, Yao; Zhang, Z H; Zhang, Z Y; Zhang, Z Y; Zhao, G; Zhao, J; Zhao, J Y; Zhao, J Z; Zhao, Lei; Zhao, Ling; Zhao, M G; Zhao, Q; Zhao, S J; Zhao, Y B; Zhao, Y X; Zhao, Z G; Zhemchugov, A; Zheng, B; Zheng, J P; Zheng, Y H; Zhong, B; Zhong, C; Zhong, X; Zhou, H; Zhou, L P; Zhou, X; Zhou, X K; Zhou, X R; Zhou, X Y; Zhou, Y Z; Zhu, J; Zhu, K; Zhu, K J; Zhu, L X; Zhu, S H; Zhu, S Q; Zhu, T J; Zhu, W J; Zhu, Y C; Zhu, Z A; Zou, B S; Zou, J H
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simulazione ASN
Il report seguente simula gli indicatori relativi alla produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione.
La simulazione si basa sui dati IRIS e presenta gli indicatori calcolati alla data indicata sul report. Si ricorda che in sede di domanda ASN presso il MIUR gli indicatori saranno invece calcolati a partire dal 1° gennaio rispettivamente del quinto/decimo/quindicesimo anno precedente la scadenza del quadrimestre di presentazione della domanda (art 2 del DM 598/2018).
In questa simulazione pertanto il valore degli indicatori potrà differire da quello conteggiato all’atto della domanda ASN effettuata presso il MIUR a seguito di:
Correzioni imputabili a eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori.
Presenza di eventuali errori di catalogazione e/o dati mancanti in IRIS
Variabilità nel tempo dei valori citazionali (per i settori bibliometrici)
Variabilità della finestra temporale considerata in funzione della sessione di domanda ASN a cui si partecipa.
La presente simulazione è stata realizzata sulla base delle regole riportate nel DM 598/2018 e dell'allegata Tabella A e delle specifiche definite all'interno del Focus Group Cineca relativo al modulo IRIS ER. Il Cineca non si assume alcuna responsabilità in merito all'uso che il diretto interessato o terzi faranno della simulazione.