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2. Status of the BELLE II Pixel Detector

Author

Belle-II DEPFET And PXD Collaboration, Giakoustidis, Georgios, Abudinen, Fernando, Ackermann, Karlheinz, Ahlburg, Patrick, Albalawi, Mohammed, Alonso, Oscar, Andricek, Laci, Ayad, Rachid, Babu, Varghese, Baur, Anselm, Bernlochner, Florian, Bilka, Tadeas, Bolz, Arthur, Bozek, Andrzej, Camien, Christian, Caldwell, Allen Christopher, Cao, Lu, Chekelian, Vladimir, Dieguez, Angel, Dingfelder, Jochen Christian, Dolezal, Zdenek, Fras, Markus, Frey, Ariane, Gabriel, Miroslav, Gadow, Karsten, Gessler, Thomas, Getzkow, Dennis, Gioi, Luigi Li, Greenwald, Daniel, Heck, Martin, Hensel, Martin, Hoek, Matthias, Huber, Stefan, Kandra, Jakub, Kapusta, Pjotr, Karl, Robert, Kehl, Jasper, Kiesling, Christian, Kisielewski, Bartlomiej, Kittlinger, David, Klose, Daniel, Kodys, Peter, Koffmane, Christian, Konorov, Igor, Krein, Matthäus, Krivokuca, Silvia, Kuhr, Thomas, Kurz, Simon, Kvasnicka, Peter, Lange, Jens Sören, Lautenbach, Klemens, Leis, Ullrich, Leitl, Philipp, Levit, Dmytro, Liemann, Gerhard, Liu, Qingyuan, Liu, Zhen’An, Lück, Thomas, Marinas, Carlos, Mccarney, Sara, Moser, Hans-Günther, Moya, David, Müller, Felix Johannes, Müller, Felix, Niebuhr, Carsten, Ninkovic, Jelena, Paschen, Botho, Paul, Stephan, Peric, Ivan, Pitzl, Daniel, Rabusov, Andrei, Reif, Markus, Reiter, Simon Patrik, Richter, Rainer, Ritter, Martin, Ritzert, Michael, Sanchez, Javier Gonzalez, Scavino, Bianca, Schaller, Gerhard, Schmitz, Jannes, Schnecke, Martina, Schopper, Florian, Schreeck, Harrison, Schwenker, Benjamin, Schwickardi, Marike, Sedlmeyer, Reinhard, Sfienti, Concettina, Simon, Frank, Skambraks, Sebastian, Skorupa, Justin, Soloviev, Yuri, Spruck, Björn, Stefkova, Slavomira, Stever, Reimer, Tafelmayer, Eva, Takahashi, Maiko, Vila, Ivan, Virto, Amparo Lopez, Vogt, Sven, Wang, Chunjie, Wieduwilt, Philipp, Windel, Hendrik, Ye, Hua, Zhao, Jingzhou, and Zlebcik, Radek

Subjects
ddc:620, Engineering & allied operations
Abstract

The Belle II experiment at the super KEK B-factory (SuperKEKB) in Tsukuba, Japan, has been collecting $e^+e^−$ collision data since March 2019. Operating at a record-breaking luminosity of up to $4.7×10^{34} cm^{−2}s^{−1}$, data corresponding to $424 fb^{−1}$ has since been recorded. The Belle II VerteX Detector (VXD) is central to the Belle II detector and its physics program and plays a crucial role in reconstructing precise primary and decay vertices. It consists of the outer 4-layer Silicon Vertex Detector (SVD) using double sided silicon strips and the inner two-layer PiXel Detector (PXD) based on the Depleted P-channel Field Effect Transistor (DePFET) technology. The PXD DePFET structure combines signal generation and amplification within pixels with a minimum pitch of $(50×55) μm^2$. A high gain and a high signal-to-noise ratio allow thinning the pixels to $75 μm$ while retaining a high pixel hit efficiency of about $99%$. As a consequence, also the material budget of the full detector is kept low at $≈0.21%$$\frac{X}{X_0}$ per layer in the acceptance region. This also includes contributions from the control, Analog-to-Digital Converter (ADC), and data processing Application Specific Integrated Circuits (ASICs) as well as from cooling and support structures. This article will present the experience gained from four years of operating PXD; the first full scale detector employing the DePFET technology in High Energy Physics. Overall, the PXD has met the expectations. Operating in the intense SuperKEKB environment poses many challenges that will also be discussed. The current PXD system remains incomplete with only 20 out of 40 modules having been installed. A full replacement has been constructed and is currently in its final testing stage before it will be installed into Belle II during the ongoing long shutdown that will last throughout 2023.

Published
2023

4. Alignment for the first precision measurements at Belle II

Author

Bilka Tadeas, Abudinen Jesus, Ackermann Karlheinz Georg, Adamczyk Karol Mateusz, Ahlburg Patrick, Aihara Hiroaki, Alonso Oscar, Albalawi Mohammed, Andricek Ladislav, Ayad Rachid, Aziz Tariq, Babu Varghese, Bacher Szymon Grzegorz, Bahinipati Seema, Batignani Giovanni, Baudot Jerome, Behera Prafulla Kumar, Bettarini Stefano, Boronat Marca, Bozek Andrzej, Braun Nils, Buchsteiner Florian, Caldwell Allen, Camien Christian, Casarosa Giulia, Cervenkov Daniel, Chekelian Vladimir, Chen Yeqi, Chilikin Kirill, Corona Luigi, Czank Thomas Rafael, Das Sanjeeda Bharati, Dash Nibedita, de Marino Gaetano, Deschamps Bruno, Dieguez Angel, Dingfelder Jochen, Doležal Zdeněk, Dujany Giulio, Esperante Daniel, Forti Francesco, Fras Markus, Frey Ariane, Friedl Markus, Fuster Juan, Gabriel Miroslav, Gadow Karsten, Ganiev Eldar, Gebauer Uwe, Gessler Thomas, Giakoustidis Georgios, Gioi Luigi Li, Gobbo Benigno, Gomis López Pablo, Greenwald Daniel, Guan Yinghui, Halder Soumen, Hara Koji, Hartbrich Oskar, Hazra Sagar, Heck Martin, Hemperek Tomasz, Hensel Martin, Higuchi Takeo, Hoek Matthias, Huber Stefan, Itoh Ryosuke, Irmler Christian, Ishikawa Akimasa, Jeon Hyebin, Joo Changwoo, Kaleta Mateusz, Kaliyar Abdul Basith, Kandra Jakub, Kang Kookhyun, Kapusta Piotr Julian, Kiesling Christian, Kisielewski Bartlomiej, Kittlinger David, Kleinwort Claus, Klose Daniel, Kodyš Peter, Koffmane Christian, Kohriky T., Kono Tomoyuki, Konorov Igor, Krivokuca Silvia, Krüger Hans, Kuhr Thomas, Kumar Manish, Kumar Rajeev, Kvasnička Peter, Lacasta Carlos, La Licata Chiara, Lalwani Kavita, Lanceri Livio, Lange Jens Sören, Lautenbach Klemens, Lee Seungcheol, Leis Ulrich, Leitl Philipp, Levit Dmytro, Li Chunhua, Li Y. B., Libby James Frederick, Liemann Gerhard, Liu Qingyuan, Liu Zhen’An, Lück Thomas, Luetticke Florian, Macharski Lydia, Maity Souvik, Mariñas Carlos, Mayekar Sukant Narendra, Mccarney Sara, Mohanty Gagan Bihari, Mora Grimaldo Johnny Alejandro, Morii Tomoko, Moser Hans-Günther, Moya David, Müller Felix Johannes, Müller Felix, Nakamura Katsuro, Nakao Mikihiko, Natkaniec Zbigniew Marian, Niebuhr Carsten, Ninkovic Jelena, Onuki Yoshiyuki, Ostrowicz Waclaw, Paladino Antonio, Paoloni Eugenio, Park Hwanbae, Park SeokHee, Paschen Botho, Paul Stephan Martin, Peric Ivan, Poblotzki Frauke, Rabusov Andrei, Rao K. K., Reiter Simon, Richter Rainer Helmut, Ripp-Baudot Isabelle, Ritter Martin, Ritzert Michael, Rizzo Giuliana, Rout Niharika, Sahoo Debashis, Sanchez Javier Gonzalez, Santelj Luka, Sato Nobuhiko, Scavino Bianca, Schaller Gerhard, Schnecke Martina, Schopper Florian, Schreeck Harrison, Schwanda Christoph, Schwenker Benjamin, Sedlmeyer Reinhard, Sfienti Concettina, Simon Frank, Skambraks Sebastian, Soloviev Yuri, Spruck Björn, Stefková Slavomira, Stever Reimer, Stolzenberg Ulf, Suzuki Soh Yamagata, Takahashi Maiko, Tafelmayer Eva, Tanaka Shuji, Tanigawa Hikaru, Thalmeier Richard, Tsuboyama Toru, Uematsu Yuma, Verbycka O., Vila Ivan, Virto Amparo Lopez, Vitale Lorenzo, Vogt Sven, Vos Marcel, Wan Kun, Wang Boqun, Watanuki Shun, Webb James, Wermes Norbert, Wessel Christian, Wiechczyński Jarosław Paweł, Wieduwilt Philipp, Windel Hendrik, Yamada Satoru, Ye Hua, Yin Hao, Zani Laura, and Zhang Tingyu

Subjects
Physics, QC1-999
Abstract

On March 25th 2019, the Belle II detector recorded the first collisions delivered by the SuperKEKB accelerator. This marked the beginning of the physics run with vertex detector. The vertex detector was aligned initially with cosmic ray tracks without magnetic field simultaneously with the drift chamber. The alignment method is based on Millepede II and the General Broken Lines track model and includes also the muon system or primary vertex position alignment. To control weak modes, we employ sensitive validation tools and various track samples can be used as alignment input, from straight cosmic tracks to mass-constrained decays. With increasing luminosity and experience, the alignment is approaching the target performance, crucial for the first physics analyses in the era of Super-BFactories. We will present the software framework for the detector calibration and alignment, the results from the first physics run and the prospects in view of the experience with the first data.

Published
2020
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5. Data quality monitors of vertex detectors at the start of the Belle II experiment

Author

Kodyš Peter, Abudinen Jesus, Ackermann Karlheinz Georg, Adamczyk Karol Mateusz, Ahlburg Patrick, Aihara Hiroaki, Alonso Oscar, Albalawi Mohammed, Andricek Ladislav, Ayad Rachid, Aziz Tariq, Babu Varghese, Bacher Szymon Grzegorz, Bahinipati Seema, Batignani Giovanni, Baudot Jerome, Behera Prafulla Kumar, Bettarini Stefano, Bilka Tadeáš, Boronat Marca, Bozek Andrzej, Braun Nils, Buchsteiner Florian, Caldwell Allen, Camien Christian, Casarosa Giulia, Cervenkov Daniel, Chekelian Vladimir, Chen Yeqi, Corona Luigi, Czank Thomas Rafael, Das Sanjeeda Bharati, Dash Nibedita, de Marino Gaetano, Deschamps Bruno, Dieguez Angel, Dingfelder Jochen, Doležal Zdeněk, Dujany Giulio, Esperante Daniel, Forti Francesco, Fras Markus, Frey Ariane, Friedl Markus, Fuster Juan, Gabriel Miroslav, Gadow Karsten, Ganiev Eldar, Gebauer Uwe, Gessler Thomas, Giakoustidis Georgios, Gioi Luigi Li, Gobbo Benigno, Gomis López Pablo, Greenwald Daniel, Guan Yinghui, Halder Soumen, Hara Koji, Hartbrich Oskar, Hazra Sagar, Heck Martin, Hemperek Tomasz, Hensel Martin, Higuchi Takeo, Hoek Matthias, Huber Stefan, Itoh Ryosuke, Irmler Christian, Ishikawa Akimasa, Jeon Hyebin, Joo Changwoo, Kaleta Mateusz, Kaliyar Abdul Basith, Kandra Jakub, Kang Kookhyun, Kapusta Piotr Julian, Kiesling Christian, Kisielewski Bartlomiej, Kittlinger David, Klose Daniel, Koffmane Christian, Kohriky T., Kono Tomoyuki, Konorov Igor, Krivokuca Silvia, Krüger Hans, Kuhr Thomas, Kumar Manish, Kumar Rajeev, Kvasnicˇka Peter, Lacasta Carlos, La Licata Chiara, Lalwani Kavita, Lanceri Livio, Lange Jens Sören, Lautenbach Klemens, Lee Seungcheol, Leis Ulrich, Leitl Philipp, Levit Dmytro, Li Chunhua, Li Y. B., Libby James Frederick, Liemann Gerhard, Liu Qingyuan, Liu Zhen’An, Lück Thomas, Luetticke Florian, Macharski Lydia, Maity Souvik, Mariñas Carlos, Mayekar Sukant Narendra, Mccarney Sara, Mohanty Gagan Bihari, Mora Grimaldo Johnny Alejandro, Morii Tomoko, Moser Hans-Günther, Moya David, Müller Felix Johannes, Müller Felix, Nakamura Katsuro, Nakao Mikihiko, Natkaniec Zbigniew Marian, Niebuhr Carsten, Ninkovic Jelena, Onuki Yoshiyuki, Ostrowicz Waclaw, Paladino Antonio, Paoloni Eugenio, Park Hwanbae, Park SeokHee, Paschen Botho, Paul Stephan Martin, Peric Ivan, Poblotzki Frauke, Rabusov Andrei, Rao K. K., Reiter Simon, Richter Rainer Helmut, Ripp-Baudot Isabelle, Ritter Martin, Ritzert Michael, Rizzo Giuliana, Rout Niharika, Sahoo Debashis, Sanchez Javier Gonzalez, Santelj Luka, Sato Nobuhiko, Scavino Bianca, Schaller Gerhard, Schnecke Martina, Schopper Florian, Schreeck Harrison, Schwanda Christoph, Schwenker Benjamin, Sedlmeyer Reinhard, Sfienti Concettina, Simon Frank, Skambraks Sebastian, Soloviev Yuri, Spruck Björn, Stefková Slavomira, Stever Reimer, Stolzenberg Ulf, Suzuki Soh Yamagata, Takahashi Maiko, Tafelmayer Eva, Tanaka Shuji, Tanigawa Hikaru, Thalmeier Richard, Tsuboyama Toru, Uematsu Yuma, Verbycka O., Vila Ivan, Virto Amparo Lopez, Vitale Lorenzo, Vogt Sven, Vos Marcel, Wan Kun, Wang Boqun, Watanuki Shun, Webb James, Wermes Norbert, Wessel Christian, Wiechczyński Jarosław Paweł, Wieduwilt Philipp, Windel Hendrik, Yamada Satoru, Ye Hua, Yin Hao, Zani Laura, and Zhang Tingyu

Subjects
Physics, QC1-999
Abstract

The Belle II experiment features a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e+e− collider at KEK in Tsukuba, Japan. The accelerator completed its first phase of commissioning in 2016, and the Belle II detector saw its first electron-positron collisions in April 2018. Belle II features a newly designed silicon vertex detector based on double-sided strip layers and DEPFET pixel layers. A subset of the vertex detector was operated in 2018 to determine background conditions (Phase 2 operation). The collaboration completed full detector installation in January 2019, and the experiment started full data taking. This paper will report on the final arrangement of the silicon vertex detector part of Belle II with a focus on online monitoring of detector conditions and data quality, on the design and use of diagnostic and reference plots, and on integration with the software framework of Belle II. Data quality monitoring plots will be discussed with a focus on simulation and acquired cosmic and collision data.

Published
2020
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6. XYZ at Belle

Author

Lange Jens Sören

Subjects
Physics, QC1-999
Abstract

Recent results of exotic states with heavy quarks, denoted as XYZ states, are presented. The results include searches for the Y(4260) in B meson decays, a spin partner of Y(4630), and the strange Pentaquark Ps+$ P_s^ + $. An addition, the measurements of the absolute branching fraction of X(3872) and search for double Zc production is dicussed.

Published
2019
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7. Cross section measurements of the e+e− → D*+D*− and e+e− → D*+D− processes at center-of-mass energies from 4.085 to 4.600 GeV

Author

Ablikim, Medina, Achasov, Mikhail N., Adlarson, Patrik, Albrecht, Malte, Aliberti, Riccardo, Amoroso, Antonio, An, M. R., An, Qi, Bai, X. H., Bai, Yu, Bakina, Olga, Baldini Ferroli, Rinaldo, Balossino, Ilaria, Ban, Yong, Batozskaya, V., Becker, D., Begzsuren, Khurelbaatar, Berger, Niklaus, Bertani, Monica, Bettoni, Diego, Bianchi, Fabrizio, Bloms, Johannes, Bortone, Alberto, Boyko, Igor R., Briere, Roy A., Brüggemann, Anja, Cai, Hao, Cai, Xiao, Calcaterra, Alessandro, Cao, G. F., Cao, N., Çetin, Serkant Ali, Chang, J. F., Chang, W. L., Chelkov, G., Chen, C., Chen, G., Chen, H. S., Chen, M. L., Chen, S. J., Chen, T., Chen, X. R., Chen, X. T., Chen, Y. B., Chen, Z. J., Cheng, W. S., Chu, X., Cibinetto, Gianluigi, Cossio, Fabio, Cui, J. J., Dai, H. L., Dai, J. P., Dbeyssi, A., de Boer, R. E., Dedovich, Dmitri V., Deng, Z. Y., Denig, Achim, Denysenko, Igor, Destefanis, Marco Giovanni Maria, De Mori, Francesca, Ding, Yanchun, 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, Luciano, Feldbauer, Florian, Felici, Giulietto, Feng, C. Q., Feng, J. H., Fischer, K., Fritsch, Miriam, Fritzsch, C. F., Fu, C. D., Gao, H., Gao, Y. N., Gao, Yang, Garbolino, Sara, Garzia, Isabella, Ge, P. T., Geng, C., Gersabeck, Evelina, Gilman, A., Götzen, Klaus, Gong, L., Gong, W. X., Gradl, Wolfgang, Greco, M., Gu, M. H., 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, Frederick Allan, He, K. K., He, K. L., Heinsius, Fritz-Herbert, Heinz, C. H., Heng, Y. K., Herold, Christoph, Himmelreich, Mathilde, Holtmann, Tobias, 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, X. T., Huang, Y. P., Huang, Z., Hussain, Tahir, Hüsken, Nils, Imoehl, William, 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, Tord, Kalantar-Nayestanaki, Nasser, Kang, X. S., Kappert, R., Kavatsyuk, Myroslav O., Ke, B. C., Keshk, I. K., Khoukaz, Alfons, Kiese, P., Kiuchi, R., Kliemt, Ralf, Koch, L., Kolcu, O. B., Kopf, Bertram, Kuemmel, M., Kuessner, M., Kupsc, Andrzej, Kühn, Wolfgang, Lane, J. J., Lange, Jens Sören, Larin, Paul, Lavania, A., Lavezzi, Lia, Lei, Z. H., Leithoff, Hans Heinrich, Lellmann, Max, Lenz, T., Li, C., Li, C. H., Li, Cheng, Li, D. M., Li, F., Li, G., 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, Xing Long, Li, Xiaoyu, Li, Z. Y., 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. 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, Frank E., Maggiora, Marco, Maldaner, Stephan, Malde, S., Malik, Qadeer Afzal, Mangoni, Alessio, Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, Johannes Gerhardus, Mezzadri, Giulio, Miao, H., Min, T. J., Mitchell, Ryan Edward, Mo, X. H., Muchnoi, Nikolai Yu., Muramatsu, Hajime, Nefedov, Y., Nerling, Frank, Nikolaev, Ivan Borisovich, Ning, Z., Nisar, Shabana, Niu, Y., Olsen, Stephen L., Ouyang, Q., Pacetti, Simone, Pan, X., Pan, Y., Pathak, A., Pelizäus, Marc, Peng, H. P., Peters, Klaus, Pettersson, J., Ping, J. L., Ping, R. G., Plura, S., Pogodin, S., Poling, Ronald, Prasad, Vindhyawasini, 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., Rashid, K. H., Redmer, C. F., Ren, K. J., Rivetti, Angelo, Rodin, Viktor, Da Rocha Rolo, Manuel Dionisio, Rong, Gang, Rosner, Christoph, Ruan, S. N., Sang, H. S., Sarantsev, Andrei V., Schelhaas, Yasemin, Schnier, Claudius, Schoenning, Karin, Scodeggio, Marco, 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, R. S., Shi, X., D Shi, X., Song, J. J., Song, W. M., Song, Y. X., Sosio, Stefano, Spataro, Stefano, 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., Y Tao, L., Tao, Q. T., Teng, J. X., Thoren, Viktor, Tian, W. H., Tian, Y., Uman, I., Wang, B., Wang, B. L., 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, Ying, Wang, Z., Wang, Z. Y., Wang, Ziyi, Wei, D. H., Weidner, Frederik, Wen, S. P., White, D. J., Wiedner, Ulrich, Wilkinson, Guy, Wolke, M., Wollenberg, Leonard, 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, H., Xiao, S. Y., Xiao, Y. L., Xiao, Z. J., 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, Q. J., Xu, S. Y., Xu, X. P., Xu, Y. C., 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 Zeng, X., Zeng, Y., Zhan, Y. H., Zhang, A. Q., Zhang, B. L., Zhang, B. X., Zhang, D. H., Zhang, G. Y., Zhang, Haitao, 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, Y., Zhang, Y. T., Zhang, Y. H., Zhang, Yan, Zhang, Yao, Zhang, Z. H., 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, Alexey, 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, Jianhui, Zhu, K., Zhu, K. J., Zhu, L. X., Zhu, S. H., Zhu, T. J., Zhu, W. J., Zhu, Y. C., Zhu, Z. A., Zou, B. S., Zou, J. H., Ablikim, Medina, Achasov, Mikhail N., Adlarson, Patrik, Albrecht, Malte, Aliberti, Riccardo, Amoroso, Antonio, An, M. R., An, Qi, Bai, X. H., Bai, Yu, Bakina, Olga, Baldini Ferroli, Rinaldo, Balossino, Ilaria, Ban, Yong, Batozskaya, V., Becker, D., Begzsuren, Khurelbaatar, Berger, Niklaus, Bertani, Monica, Bettoni, Diego, Bianchi, Fabrizio, Bloms, Johannes, Bortone, Alberto, Boyko, Igor R., Briere, Roy A., Brüggemann, Anja, Cai, Hao, Cai, Xiao, Calcaterra, Alessandro, Cao, G. F., Cao, N., Çetin, Serkant Ali, Chang, J. F., Chang, W. L., Chelkov, G., Chen, C., Chen, G., Chen, H. S., Chen, M. L., Chen, S. J., Chen, T., Chen, X. R., Chen, X. T., Chen, Y. B., Chen, Z. J., Cheng, W. S., Chu, X., Cibinetto, Gianluigi, Cossio, Fabio, Cui, J. J., Dai, H. L., Dai, J. P., Dbeyssi, A., de Boer, R. E., Dedovich, Dmitri V., Deng, Z. Y., Denig, Achim, Denysenko, Igor, Destefanis, Marco Giovanni Maria, De Mori, Francesca, Ding, Yanchun, 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, Luciano, Feldbauer, Florian, Felici, Giulietto, Feng, C. Q., Feng, J. H., Fischer, K., Fritsch, Miriam, Fritzsch, C. F., Fu, C. D., Gao, H., Gao, Y. N., Gao, Yang, Garbolino, Sara, Garzia, Isabella, Ge, P. T., Geng, C., Gersabeck, Evelina, Gilman, A., Götzen, Klaus, Gong, L., Gong, W. X., Gradl, Wolfgang, Greco, M., Gu, M. H., 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, Frederick Allan, He, K. K., He, K. 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Abstract

The Born cross sections of the e+e− → D*+D*− and e+e− → D*+D− processes are measured using e+e− collision data collected with the BESIII experiment at center-of-mass energies from 4.085 to 4.600 GeV, corresponding to an integrated luminosity of 15.7 fb−1. The results are consistent with and more precise than the previous measurements by the Belle, Babar and CLEO collaborations. The measurements are essential for understanding the nature of vector charmonium and charmonium-like states.

Published
2022

8. Measurement of proton electromagnetic form factors in the time-like region using initial state radiation at BESIII

Author

Ablikim, Medina, Achasov, Mikhail N., Adlarson, Patrik, Ahmed, Samer, Albrecht, Malte, Aliberti, Riccardo, Amoroso, Antonio, An, M.R., An, Qi, Bai, X.H., Bai, Yu, Bakina, Olga, Baldini Ferroli, Rinaldo, Balossino, Ilaria, Ban, Yong, Begzsuren, Khurelbaatar, Berger, Niklaus, Bertani, Monica, Bettoni, Diego, Bianchi, Fabrizio, Bloms, Johannes, Bortone, Alberto, Boyko, Igor R., Briere, Roy A., Cai, Hao, Cai, Xiao, Calcaterra, Alessandro, Cao, G.F., Cao, N., Çetin, Serkant Ali, Chang, Jinfan, Chang, W.L., Chelkov, Gueorgui A., Chen, D.Y., Chen, G., Chen, Hesheng, Chen, M.L., Chen, S.J., Chen, X.R., Chen, Yuanbo, Chen, Z.J., Cheng, W.S., Cibinetto, Gianluigi, Cossio, Fabio, Cui, X.F., Dai, Hongliang, Dai, Xinchen, Dbeyssi, Alaa, Boer, Remco E. de, Dedovich, Dmitri V., Deng, Ziyan, Denig, Achim, Denysenko, Igor, Destefanis, Marco Giovanni Maria, De Mori, Francesca, Ding, Yanchun, Dong, C., Dong, J., Dong, Liaoyuan, Dong, Mingyi, Dong, X., Du, Shuxian, Fan, Y.L., Fang, J., Fang, Shuangshi, Fang, Y., Farinelli, Riccardo, Fava, Luciano, Feldbauer, Florian, Felici, Giulietto, Feng, C.Q., Feng, J.H., Fritsch, Miriam, Fu, Chengdong, Gao, Y., Gao, Y.G., Garzia, Isabella, Ge, P.T., Geng, C., Gersabeck, Evelina, Gilman, A., Götzen, Klaus, Gong, L., Gong, Wenxuan, Gradl, Wolfgang, Greco, M., Gu, L.M., Gu, Minhao, Gu, S., Gu, Y.T., Guan, C.Y., Guo, Aiqiang, Guo, L.B., Guo, R.P., Guo, Yuping, Guskov, Alexey, Han, T.T., Han, W.Y., Hao, Xiqing, Harris, Frederick Allan, Hüsken, Nils, He, K.L., Heinsius, Fritz-Herbert, Heinz, C.H., Held, T., Heng, Yuekun, Herold, Christoph, Himmelreich, Mathilde, Holtmann, Tobias, Hou, G.Y., Hou, Y.R., Hou, Zhilong, Hu, Haiming, Hu, J.F., Hu, T., Hu, Y., Huang, G.S., Huang, L.Q., Huang, Xingtao, Huang, Y.P., Huang, Z., Hussain, Tahir, Ikegami Andersson, Walter, Imoehl, William, Irshad, M., Jaeger, S., Janchiv, S., Ji, Quan, Ji, Qingping, Ji, X.B., Ji, X.L., Ji, Y.Y., Jiang, H.B., Jiang, Xiaoshan, Jiao, J.B., Jiao, Z., Jin, Shan, Jin, Y., Jing, M.Q., Johansson, Tord, Kalantar-Nayestanaki, Nasser, Kang, X. S., Kappert, Rosa, Kavatsyuk, Myroslav O., Ke, B.C., Keshk, I.K., Khoukaz, Alfons, Kiese, P., Kiuchi, R., Kliemt, Ralf, Koch, L., Kolcu, Onur Bugra, Kopf, Bertram, Kuemmel, M., Küßner, Meike, Kupsc, Andrzej, Kurth, Matthew Glenn, Kühn, Wolfgang, Lane, John Jake, Lange, Jens Sören, Larin, Paul, Lavania, Anita, Lavezzi, Lia, Lei, Z.H., Leithoff, Hans Heinrich, Lellmann, Max, Lenz, Thomas, Li, C., Li, C.H., Li, Cheng, Li, D.M., Li, F., Li, G., Li, H., Li, Haibo, Li, H.J., Li, J.L., Li, J.Q., Li, J.S., Li, Ke, Li, L.K., Li, Lei, Li, P.R., Li, S.Y., Li, Weidong, Li, Weiguo, Li, X.H., Li, Xing Long, Li, Xiaoyu, Li, Z.Y., Liang, H., Liang, Y.F., Liang, Y.T., Liao, G.R., Liao, L.Z., Libby, J., Lin, C.X., Lin, D.X., Liu, B.J., Liu, C.X., Liu, D., Liu, Fu-Hu, Liu, Fang, Liu, Feng, 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, L., Liu, M.H., Liu, P.L., Liu, Q., Liu, S.B., Liu, Shuai, Liu, T., Liu, W.M., Liu, X., Liu, Y., Liu, Y.B., Liu, Zhen-An, Liu, Z.Q., Lou, Xinchou, Lu, F.X., Lu, H.J., Lu, J.D., Lu, Junguang, Lu, X.L., Lu, Y., Lu, Yunpeng, Luo, Chenglin, Luo, M.X., Luo, P.W., Luo, Tao, Luo, X.L., Lusso, S., Lyu, Xiao-Rui, Ma, Fengcai, Ma, Hailong, Ma, Lianliang, Ma, M.M., Ma, Qiumei, Ma, R.Q., Ma, R.T., Ma, X.X., Ma, Xiaoyan, Maas, Frank E., Maggiora, Marco, Maldaner, Stephan, Malde, Sneha, Malik, Qadeer Afzal, Mangoni, Alessio, Mao, Yajun, Mao, Zepu, Marcello, Simonetta, Meng, Z.X., Messchendorp, Johannes Gerhardus, Mezzadri, Giulio, Min, T.J., Mitchell, Ryan Edward, Mo, Xiaohu, Mo, Y.J., Muchnoi, Nikolai Yu., Muramatsu, Hajime, Nakhoul, Simon, Nefedov, Yury, Nerling, Frank, Nikolaev, Ivan Borisovich, Ning, Z., Nisar, Shabana, Olsen, Stephen L., Ouyang, Qun, Pacetti, Simone, Pan, Xiang, Pan, Y., Pathak, A., Patteri, Piero, Pelizäus, Marc, Peng, H. 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Abstract

The electromagnetic process is studied with the initial-state-radiation technique using 7.5 fb−1 of data collected by the BESIII experiment at seven energy points from 3.773 to 4.600 GeV. The Born cross section and the effective form factor of the proton are measured from the production threshold to 3.0 GeV/ using the invariant-mass spectrum. The ratio of electric and magnetic form factors of the proton is determined from the analysis of the proton-helicity angular distribution.

Published
2021

10. XYZ at Belle

Author

Lange, Jens Sören

Subjects
High Energy Physics - Phenomenology, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment, High Energy Physics - Experiment
Abstract

Recent results of exotic states with heavy quarks, denoted as $XYZ$ states, are presented. The results include searches for the $Y$(4260) in $B$ meson decays, a spin partner of $Y$(4630), and the strange Pentaquark $P_s^+$. In addition, the measurements of the absolute branching fraction of $X$(3872) and search for double $Z_c$ production is discussed., Comment: Proceedings of PHIPSI19, International Workshop on e+e- collisions from Phi to Psi, Novosibirsk, Russia, 25.02.-01.03.2019

Published
2019

11. Exotic and Conventional Quarkonium Physics Prospects at Belle II: Search for a Partner State to the $X(3872)$ at the $D^{*0}\bar{D}^{*0}$ threshold

Author

Lautenbach, Klemens and Lange, Jens Sören

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, High Energy Physics - Experiment
Abstract

The Belle II experiment at the SuperKEKB asymmetric $e^+e^-$ collider at KEK, Tsukuba, Japan, is recording data since 2018. The expected high luminosity of $\mathcal{L}=8\cdot 10^{35}~$cm$^{-2}$s$^{-1}$ enables searches for yet unobserved exotic hadronic states in B meson decays. We describe the search for a partner state of the $X(3872)$ at the $D^{*}\bar{D}^{*0}$ threshold. The reconstruction of charmed mesons is tested with experimental data corresponding to an integrated luminosity of $504~$pb$^{-1}$ collected at the energy in the center of mass of $\Upsilon(4S)$ in 2018, and $2.62~$fb$^{-1}$ in 2019., Comment: Proceedings of the European Physical Society Conference on High Energy Physics (EPS-HEP2019), 10-17 July, 2019, Ghent, Belgium

Published
2019
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12. Exotics: Heavy Pentaquarks and Tetraquarks

Author

Ali, Ahmed, Lange, Jens Sören, and Stone, Sheldon

Subjects
deuteron, quark model, High Energy Physics::Lattice, one-meson, Nuclear Theory, High Energy Physics::Phenomenology, pentaquark: heavy, tetraquark, quantum number, meson, tracks, baryon, quark antiquark: pair, multiquark, quark: pair, kinematics: effect, High Energy Physics::Experiment, hadron, antiquark, structure, Nuclear Experiment, new particle
Abstract

For many decades after the invention of the quark model in 1964 there was no evidence that hadrons are formed from anything other than the simplest pairings of quarks and antiquarks, mesons being formed of a quark-antiquark pair and baryons from three quarks. In the last decade, however, in an explosion of data from both $e^+e^-$ and hadron colliders, there are many recently observed states that do not fit into this picture. These new particles are called generically 'exotics'. They can be either mesons or baryons. Remarkably, they all decay into at least one meson formed of either a $c\overline{c}$ or $b\overline{b}$ pair. In this review, after the introduction, we explore each of these new discoveries in detail first from an experimental point of view, then subsequently give a theoretical discussion. These exotics can be explained if the new mesons contain two-quarks and two-antiquarks (tetraquarks), while the baryons contain four-quarks plus an antiquark (pentquarks). The theoretical explanations for these states take three divergent tracks: tightly bound objects, just as in the case of normal hadrons, but with more constituents, or loosely bound 'molecules' similar to the deuteron, but formed from two mesons, or a meson or baryon, or more wistfully, they are not multiquark states but appear due to kinematic effects caused by different rescatterings of virtual particles; most of these models have all been post-dictions. Both the tightly and loosely bound models predict the masses and related quantum numbers of new, as yet undiscovered states. Thus, future experimental discoveries are needed along with theoretical advances to elucidate the structure of these new exotic states.

Published
2017
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14. Resonances in QCD

Author

Lutz, Matthias F.M., primary, Lange, Jens Sören, additional, Pennington, Michael, additional, Bettoni, Diego, additional, Brambilla, Nora, additional, Crede, Volker, additional, Eidelman, Simon, additional, Gillitzer, Albrecht, additional, Gradl, Wolfgang, additional, Lang, Christian B., additional, Metag, Volker, additional, Nakano, Takashi, additional, Nieves, Juan, additional, Neubert, Sebastian, additional, Oka, Makoto, additional, Olsen, Stephen L., additional, Pappagallo, Marco, additional, Paul, Stephan, additional, Pelizäus, Marc, additional, Pilloni, Alessandro, additional, Prencipe, Elisabetta, additional, Ritman, Jim, additional, Ryan, Sinead, additional, Thoma, Ulrike, additional, Uwer, Ulrich, additional, and Weise, Wolfram, additional

Published
2016
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