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1. The International Linear Collider: Report to Snowmass 2021

Author: Aryshev, Alexander, Behnke, Ties, Berggren, Mikael, Brau, James, Craig, Nathaniel, Freitas, Ayres, Gaede, Frank, Gessner, Spencer, Gori, Stefania, Grojean, Christophe, Heinemeyer, Sven, Jeans, Daniel, Kruger, Katja, List, Benno, List, Jenny, Liu, Zhen, Michizono, Shinichiro, Miller, David W., Moult, Ian, Murayama, Hitoshi, Nakada, Tatsuya, Nanni, Emilio, Nojiri, Mihoko, Padamsee, Hasan, Perelstein, Maxim, Peskin, Michael E., Poeschl, Roman, Posen, Sam, Robson, Aidan, Strube, Jan, Suehara, Taikan, Tian, Junping, Titov, Maxim, Vos, Marcel, White, Andrew, Wilson, Graham, Yokoya, Kaoru, Zarnecki, Aleksander Filip, Adachi, Ichiro, Agashe, Kaustubh, Jovin, Tatjana Agatonovic, Aihara, Hiroaki, Altmannshofer, Wolfgang, Alves, Daniele, Anguiano, Justin, Aoki, Ken-Ichi, Aoki, Masato, Aoki, Toshihiro, Aoki, Yumi, Arai, Yasuo, Araki, Hayato, Asada, Haruka, Asai, Kento, Asai, Shoji, Attie, David, Baer, Howard, Bagger, Jonathan, Bai, Yang, Bailey, Ian, Barrue, Ricardo, Bartoldus, Rainer, Barzi, Emanuela, Basso, Matthew, Bauerdick, Lothar, Baum, Sebastian, Bellerive, Alain, Belomestnykh, Sergey, Antequera, Jorge Berenguer, Beyer, Jakob, Bhat, Pushpalatha, Bilki, Burak, Black, Kevin, Bloom, Kenneth, Bodwin, Geoffrey, Boisvert, Veronique, Boran, Fatma, Boudry, Vincent, Boughezal, Radja, Boveia, Antonio, Bozovic-Jelisavcic, Ivanka, Brient, Jean-Claude, Brodsky, Stanley, Brunetti, Laurent, Buesser, Karsten, Bulyak, Eugene, Burrows, Philip N., Burt, Graeme C., Cai, Yunhai, Cairo, Valentina, Canepa, Anadi, Celiberto, Francesco Giovanni, Cenni, Enrico, Chacko, Zackaria, Chaikovska, Iryna, Checchin, Mattia, Chen, Lisong, Chen, Thomas Y., Cheng, Hsin Chia, Cho, Gi-Chol, Choudhary, Brajesh, Clarke, Jim, Cline, James, Co, Raymond, Cohen, Timothy, Colas, Paul, Damerell, Chris, Das, Arindam, Dasu, Sridhara, Dawson, Sally, de Blas, Jorge, de Lima, Carlos Henrique, Deandrea, Aldo, Dehmelt, Klaus, Delayen, Jean, Demarteau, Marcel, Denisov, Dmitri, Dermisek, Radovan, Dieguez, Angel, Dohmae, Takeshi, Dopke, Jens, Dort, Katharina, Du, Yong, Dudar, Bohdan, Dutta, Bhaskar, Dutta, Juhi, Einhaus, Ulrich, Elsen, Eckhard, Endo, Motoi, Eremeev, Grigory, Eren, Engin, Erler, Jens, Esarey, Eric, Everett, Lisa, Golfe, Angeles Faus, Garcia, Marcos Fernandez, Foster, Brian, Fourches, Nicolas, Fouz, Mary-Cruz, Fujii, Keisuke, Fujimoto, Junpei, Torregrosa, Esteban Fullan, Furukawa, Kazuro, Fusayasu, Takahiro, Fuster, Juan, Ganjour, Serguei, Gao, Yuanning, Gaur, Naveen, Geng, Rongli, Georgi, Howard, Gherghetta, Tony, Goldstein, Joel, Goncalves, Dorival, Gonski, Julia, Gonzalo, Tomas, Goto, Takeyoshi, Goto, Toru, Graf, Norman, Grames, Joseph, Grannis, Paul, Gray, Lindsey, Grohsjean, Alexander, Gu, Jiayin, Guler, Yalcin, Gutierrez, Phillip, Haba, Junji, Haber, Howard, Hallford, John, Hamaguchi, Koichi, Han, Tao, Hara, Kazuhiko, Harada, Daisuke, Hashimoto, Koji, Hashino, Katsuya, Hayashi, Masahito, Heinrich, Gudrun, Hidaka, Keisho, Higuchi, Takeo, Hinode, Fujio, Hioki, Zenro, Hirose, Minoru, Hiroshima, Nagisa, Hisano, Junji, Hollik, Wolfgang, Homiller, Samuel, Hong, Sungwoo, Hook, Anson, Horii, Yasuyuki, Hoshina, Hiroki, Hristova, Ivana, Huitu, Katri, Hyakutake, Yoshifumi, Iijima, Toru, Ikematsu, Katsumasa, Ilderton, Anton, Inami, Kenji, Irles, Adrian, Ishikawa, Akimasa, Ishiwata, Koji, Ito, Hayato, Ivanov, Igor, Iwamoto, Sho, Iwamoto, Toshiyuki, Iwasaki, Masako, Iwashita, Yoshihisa, Jia, Haoyi, Morales, Fabricio Jimenez, Joshi, Prakash, Jung, Sunghoon, Kacarevic, Goran, Kagan, Michael, Kakizaki, Mitsuru, Kalinowski, Jan, Kaminski, Jochen, Kanaya, Kazuyuki, Kanemura, Shinya, Kanno, Hayato, Kano, Yuya, Kashiwagi, Shigeru, Kato, Yukihiro, Kawada, Nanami, Kawada, Shin-ichi, Kawagoe, Kiyotomo, Khoze, Valery, Kichimi, Hiromichi, Kim, Doojin, Kitahara, Teppei, Kitano, Ryuichiro, Klamka, Jan, Komamiya, Sachio, Kong, K. C., Konomi, Taro, Kotera, Katsushige, Kou, Emi, Kravchenko, Ilya, Kubo, Kiyoshi, Kubo, Takayuki, Kumaoka, Takuya, Kumar, Ashish, Kumar, Nilanjana, Kunath, Jonas, Kundu, Saumyen, Kunitomo, Hiroshi, Kurata, Masakazu, Kuriki, Masao, Kusenko, Alexander, Lagouri, Theodota, Lankford, Andrew J., Lastovicka-Medin, Gordana, Diberder, Francois Le, Lee, Claire, Liepe, Matthias, Linacre, Jacob, Liptak, Zachary, Lomte, Shivani, Low, Ian, Ma, Yang, Maalouf, Hani, MacFarlane, David, Madison, Brendon, Madlener, Thomas, Maeda, Tomohito, Malek, Paul, Mandal, Sanjoy, Markiewicz, Thomas, Marshall, John, Martens, Aurelien, Martin, Victoria, Martinello, Martina, Rivero, Celso Martinez, Maru, Nobuhito, Matheson, John, Matsumoto, Shigeki, Matsunaga, Hiroyuki, Matsuo, Yutaka, Mawatari, Kentarou, Mbagwu, Johnpaul, McIntosh, Peter, McKeown, Peter, Meade, Patrick, Mekala, Krzysztof, Merkel, Petra, Mihara, Satoshi, Miralles, Víctor, Lopez, Marcos Miralles, Mishima, Go, Mishima, Satoshi, Mistlberger, Bernhard, Mitov, Alexander, Miyabayashi, Kenkichi, Miyamoto, Akiya, Mohanty, Gagan, Monaco, Laura, Mondragon, Myriam, Montgomery, Hugh E., Moortgat-Pick, Gudrid, Morange, Nicolas, Llacer, María Moreno, Moretti, Stefano, Mori, Toshinori, Morii, Toshiyuki, Moroi, Takeo, Morrissey, David, Nachman, Benjamin, Nagano, Kunihiro, Nakajima, Jurina, Nakamura, Eiji, Narita, Shinya, Nath, Pran, Nelson, Timothy, Newbold, David, Niki, Atsuya, Nishimura, Yasuhiro, Nishiyama, Eisaku, Nomura, Yasunori, Nowak, Kacper, Nozaki, Mitsuaki, de Vera, María Teresa Nunez Pardo, Ochoa, Ines, Ogata, Masahito, Ohashi, Satoru, Ohta, Hikaru, Ohta, Shigemi, Ohuchi, Norihito, Oide, Hideyuki, Okada, Nobuchika, Okada, Yasuhiro, Okawa, Shohei, Okayasu, Yuichi, Okugawa, Yuichi, Okugi, Toshiyuki, Okui, Takemichi, Okuyama, Yoshitaka, Omet, Mathieu, Omori, Tsunehiko, Ono, Hiroaki, Onoe, Tomoki, Ootani, Wataru, Otono, Hidetoshi, Ozawa, Shuhei, Griso, Simone Pagan, Papa, Alessandro, Paparella, Rocco, Park, Eun-Kyung, Perez, Gilad, Perez-Lorenzana, Abdel, Peters, Yvonne, Petriello, Frank, Piedra, Jonatan, Porod, Werner, Potter, Christopher, Price, Alan, Radkhorrami, Yasser, Reina, Laura, Reuter, Juergen, Richard, Francois, Riemann, Sabine, Rimmer, Robert, Rizzo, Thomas, Robens, Tania, Ruber, Roger, Jimeno, Alberto Ruiz, Saeki, Takayuki, Saha, Ipsita, Saito, Tomoyuki, Sakaguchi, Makoto, Sakai, Tadakatsu, Sakaki, Yasuhito, Sakurai, Kodai, Salvatico, Riccardo, Salvatore, Fabrizio, San, Yik Chuen, Sandick, Pearl, Sanuki, Tomoyuki, Sasikumar, Kollassery Swathi, Schaefer, Oliver, Schaefer, Ruth, Schneekloth, Uwe, Schoerner-Sadenius, Thomas, Schroeder, Carl, Schuster, Philip, Schwartzman, Ariel, Schwienhorst, Reinhard, Sefkow, Felix, Seiya, Yoshihiro, Sekiguchi, Motoo, Sekizawa, Kazuyuki, Senyo, Katsumi, Sert, Hale, Sertore, Danielev, Settles, Ronald, Shafi, Qaisar, Shahdara, Tetsuo, Haghi, Barmak Shams Es, Sharma, Ashish, Shelton, Jessie, Shepherd-Themistocleous, Claire, Shibuya, Hiroto, Shidara, Tetsuo, Shimomura, Takashi, Shindou, Tetsuo, Shoji, Yutaro, Shu, Jing, Sievers, Ian, Simon, Frank, Singh, Rajeev, Soreq, Yotam, Stanitzki, Marcel, Stapnes, Steinar, Steinhebel, Amanda, Stupak, John, Su, Shufang, Suekane, Fumihiko, Sugamoto, Akio, Sugawara, Yuji, Sugimoto, Satoru, Sugimoto, Yasuhiro, Sugiyama, Hiroaki, Sumino, Yukinari, Sundrum, Raman, Suzuki, Atsuto, Suzuki, Shin, Swiatlowski, Maximilian, Tait, Tim M. P., Takahashi, Shota, Takahashi, Tohru, Takeshita, Tohru, Takeuchi, Michihisa, Takubo, Yosuke, Tanabe, Tomohiko, Tanedo, Philip, Tanimoto, Morimitsu, Tao, Shuichiro, Tata, Xerxes, Tauchi, Toshiaki, Taylor, Geoffrey, Terada, Takahiro, Terunuma, Nobuhiro, Thaler, Jesse, Thea, Alessandro, Tillinger, Finn, Timmermans, Jan, Tobioka, Kohsaku, Toda, Kouichi, Tokiyasu, Atsushi, Toma, Takashi, Torndal, Julie, Tosun, Mehmet, Tsai, Yu-Dai, Tseng, Shih-Yen, Tsumura, Koji, Tuckler, Douglas, Uchida, Yoshiki, Uchiyama, Yusuke, Ueda, Daiki, Ukegawa, Fumihiko, Umemori, Kensei, Urakawa, Junji, Vallee, Claude, Vega, Roberto, Velasco, Liliana, Verdu-Andres, Silvia, Vernieri, Caterina, Vila, Anna, Alvarez, Ivan Vila, Vossebeld, Joost, Vsrms, Raghava, Vukasinovic, Natasa, Wackeroth, Doreen, Wakida, Moe, Wang, Liantao, Washio, Masakazu, Watanabe, Takashi, Watson, Nigel, Watts, Gordon, Weiglein, Georg, Wells, James D., Wenskat, Marc, Westhoff, Susanne, White, Glen, Williams, Ciaran, Willocq, Stephane, Wing, Matthew, Winter, Alasdair, Winter, Marc, Wu, Yongcheng, Xie, Keping, Xu, Tao, Yakovlev, Vyacheslav, Yamada, Shuei, Yamamoto, Akira, Yamamoto, Hitoshi, Yamamoto, Kei, Yamamoto, Yasuchika, Yamanaka, Masato, Yamashita, Satoru, Yamatani, Masahiro, Yamatsu, Naoki, Yasui, Shigehiro, Yoda, Takuya, Yonamine, Ryo, Yoshihara, Keisuke, Yoshioka, Masakazu, Yoshioka, Tamaki, Yuasa, Fukuko, Yumino, Keita, Zerwas, Dirk, Zheng, Ya-Juan, Zhou, Jia, Zhu, Hua Xing, Zobov, Mikhail, and Zomer, Fabian
Subjects: Physics - Accelerator Physics, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community., Comment: 356 pages, Large pdf file (40 MB) submitted to Snowmass 2021; v2 references to Snowmass contributions added, additional authors; v3 references added, some updates, additional authors
Published: 2022

2. Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider

Author: Alimena, Juliette, Beacham, James, Borsato, Martino, Cheng, Yangyang, Vidal, Xabier Cid, Cottin, Giovanna, De Roeck, Albert, Desai, Nishita, Curtin, David, Evans, Jared A., Knapen, Simon, Kraml, Sabine, Lessa, Andre, Liu, Zhen, Mehlhase, Sascha, Ramsey-Musolf, Michael J., Russell, Heather, Shelton, Jessie, Shuve, Brian, Verducci, Monica, Zurita, Jose, Adams, Todd, Adersberger, Michael, Alpigiani, Cristiano, Apresyan, Artur, Bainbridge, Robert John, Batozskaya, Varvara, Beauchesne, Hugues, Benato, Lisa, Berlendis, S., Bhal, Eshwen, Blekman, Freya, Borovilou, Christina, Boyd, Jamie, Brau, Benjamin P., Bryngemark, Lene, Buchmueller, Oliver, Buschmann, Malte, Buttinger, William, Campanelli, Mario, Cesarotti, Cari, Chen, Chunhui, Cheng, Hsin-Chia, Cheong, Sanha, Citron, Matthew, Coccaro, Andrea, Coco, V., Conte, Eric, Cormier, Félix, Corpe, Louie D., Craig, Nathaniel, Cui, Yanou, Dall'Occo, Elena, Dallapiccola, C., Darwish, M. R., Davoli, Alessandro, de Cosa, Annapaola, De Simone, Andrea, Rose, Luigi Delle, Deppisch, Frank F., Dey, Biplab, Diamond, Miriam D., Dienes, Keith R., Dildick, Sven, Döbrich, Babette, Drewes, Marco, Eich, Melanie, ElSawy, M., del Valle, Alberto Escalante, Facini, Gabriel, Farina, Marco, Feng, Jonathan L., Fischer, Oliver, Flaecher, H. U., Foldenauer, Patrick, Freytsis, Marat, Fuks, Benjamin, Galon, Iftah, Gershtein, Yuri, Giagu, Stefano, Giammanco, Andrea, Gligorov, Vladimir V., Golling, Tobias, Grancagnolo, Sergio, Gustavino, Giuliano, Haas, Andrew, Hahn, Kristian, Hajer, Jan, Hammad, Ahmed, Heinrich, Lukas, Heisig, Jan, Helo, J. C., Hesketh, Gavin, Hill, Christopher S., Hirsch, Martin, Hohlmann, M., Hulsbergen, W., Huth, John, Ilten, Philip, Jacques, Thomas, Jayatilaka, Bodhitha, Jeng, Geng-Yuan, Johns, K. A., Kaji, Toshiaki, Kasieczka, Gregor, Kats, Yevgeny, Kazana, Malgorzata, Keller, Henning, Khlopov, Maxim Yu., Kling, Felix, Kolberg, Ted R., Kostiuk, Igor, Kuwertz, Emma Sian, Kvam, Audrey, Landsberg, Greg, Lanfranchi, Gaia, Lara, Iñaki, Ledovskoy, Alexander, Linthorne, Dylan, Liu, Jia, Longarini, Iacopo, Lowette, Steven, Lubatti, Henry, Lutz, Margaret, Luo, Jingyu, Mamužić, Judita, Marinangeli, Matthieu, Mariotti, Alberto, Marlow, Daniel, McCullough, Matthew, McDermott, Kevin, Mermod, P., Milstead, David, Mitsou, Vasiliki A., Berlingen, Javier Montejo, Moortgat, Filip, Morandini, Alessandro, Morris, Alice Polyxeni, Morse, David Michael, Mrenna, Stephen, Nachman, Benjamin, Nemevšek, Miha, Nesti, Fabrizio, Ohm, Christian, Pascoli, Silvia, Pedro, Kevin, Peña, Cristián, Rodriguez, Karla Josefina Pena, Piedra, Jónatan, Pinfold, James L., Policicchio, Antonio, Popara, Goran, Prisciandaro, Jessica, Proffitt, Mason, Rauco, Giorgia, Redi, Federico, Reece, Matthew, Hall, Allison Reinsvold, Sfar, H. Rejeb, Renner, Sophie, Roepe, Amber, Ronzani, Manfredi, Salvioni, Ennio, Santra, Arka, Sawada, Ryu, Scholtz, Jakub, Schuster, Philip, Schwaller, Pedro, Sebastiani, Cristiano, Sekmen, Sezen, Selvaggi, Michele, Si, Weinan, Soffi, Livia, Stolarski, Daniel, Stuart, David, Stupak III, John, Sung, Kevin, Taylor, Wendy, Templ, Sebastian, Thomas, Brooks, Torró-Pastor, Emma, Trocino, Daniele, Trojanowski, Sebastian, Trovato, Marco, Tsai, Yuhsin, Tully, C. G., Vámi, Tamás Álmos, Vasquez, Juan Carlos, Sierra, Carlos Vázquez, Vellidis, K., Vermassen, Basile, Vit, Martina, Walker, Devin G. E., Wang, Xiao-Ping, Watts, Gordon, Xie, Si, Yexley, Melissa, Young, Charles, Yu, Jiang-Hao, Zalewski, Piotr, and Zhang, Yongchao
Subjects: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract: Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these long-lived particles (LLPs) can decay far from the interaction vertex of the primary proton-proton collision. Such LLP signatures are distinct from those of promptly decaying particles that are targeted by the majority of searches for new physics at the LHC, often requiring customized techniques to identify, for example, significantly displaced decay vertices, tracks with atypical properties, and short track segments. Given their non-standard nature, a comprehensive overview of LLP signatures at the LHC is beneficial to ensure that possible avenues of the discovery of new physics are not overlooked. Here we report on the joint work of a community of theorists and experimentalists with the ATLAS, CMS, and LHCb experiments --- as well as those working on dedicated experiments such as MoEDAL, milliQan, MATHUSLA, CODEX-b, and FASER --- to survey the current state of LLP searches at the LHC, and to chart a path for the development of LLP searches into the future, both in the upcoming Run 3 and at the High-Luminosity LHC. The work is organized around the current and future potential capabilities of LHC experiments to generally discover new LLPs, and takes a signature-based approach to surveying classes of models that give rise to LLPs rather than emphasizing any particular theory motivation. We develop a set of simplified models; assess the coverage of current searches; document known, often unexpected backgrounds; explore the capabilities of proposed detector upgrades; provide recommendations for the presentation of search results; and look towards the newest frontiers, namely high-multiplicity "dark showers", highlighting opportunities for expanding the LHC reach for these signals.
Published: 2019
Full Text: View/download PDF

3. A Roadmap for HEP Software and Computing R&D for the 2020s

Author: Albrecht, Johannes, Alves Jr, Antonio Augusto, Amadio, Guilherme, Andronico, Giuseppe, Anh-Ky, Nguyen, Aphecetche, Laurent, Apostolakis, John, Asai, Makoto, Atzori, Luca, Babik, Marian, Bagliesi, Giuseppe, Bandieramonte, Marilena, Banerjee, Sunanda, Barisits, Martin, Bauerdick, Lothar A. T., Belforte, Stefano, Benjamin, Douglas, Bernius, Catrin, Bhimji, Wahid, Bianchi, Riccardo Maria, Bird, Ian, Biscarat, Catherine, Blomer, Jakob, Bloom, Kenneth, Boccali, Tommaso, Bockelman, Brian, Bold, Tomasz, Bonacorsi, Daniele, Boveia, Antonio, Bozzi, Concezio, Bracko, Marko, Britton, David, Buckley, Andy, Buncic, Predrag, Calafiura, Paolo, Campana, Simone, Canal, Philippe, Canali, Luca, Carlino, Gianpaolo, Castro, Nuno, Cattaneo, Marco, Cerminara, Gianluca, Villanueva, Javier Cervantes, Chang, Philip, Chapman, John, Chen, Gang, Childers, Taylor, Clarke, Peter, Clemencic, Marco, Cogneras, Eric, Coles, Jeremy, Collier, Ian, Colling, David, Corti, Gloria, Cosmo, Gabriele, Costanzo, Davide, Couturier, Ben, Cranmer, Kyle, Cranshaw, Jack, Cristella, Leonardo, Crooks, David, Crépé-Renaudin, Sabine, Currie, Robert, Dallmeier-Tiessen, Sünje, De, Kaushik, De Cian, Michel, De Roeck, Albert, Peris, Antonio Delgado, Derue, Frédéric, Di Girolamo, Alessandro, Di Guida, Salvatore, Dimitrov, Gancho, Doglioni, Caterina, Dotti, Andrea, Duellmann, Dirk, Duflot, Laurent, Dykstra, Dave, Dziedziniewicz-Wojcik, Katarzyna, Dziurda, Agnieszka, Egede, Ulrik, Elmer, Peter, Elmsheuser, Johannes, Elvira, V. Daniel, Eulisse, Giulio, Farrell, Steven, Ferber, Torben, Filipcic, Andrej, Fisk, Ian, Fitzpatrick, Conor, Flix, José, Formica, Andrea, Forti, Alessandra, Franzoni, Giovanni, Frost, James, Fuess, Stu, Gaede, Frank, Ganis, Gerardo, Gardner, Robert, Garonne, Vincent, Gellrich, Andreas, Genser, Krzysztof, George, Simon, Geurts, Frank, Gheata, Andrei, Gheata, Mihaela, Giacomini, Francesco, Giagu, Stefano, Giffels, Manuel, Gingrich, Douglas, Girone, Maria, Gligorov, Vladimir V., Glushkov, Ivan, Gohn, Wesley, Lopez, Jose Benito Gonzalez, Caballero, Isidro González, Fernández, Juan R. González, Govi, Giacomo, Grandi, Claudio, Grasland, Hadrien, Gray, Heather, Grillo, Lucia, Guan, Wen, Gutsche, Oliver, Gyurjyan, Vardan, Hanushevsky, Andrew, Hariri, Farah, Hartmann, Thomas, Harvey, John, Hauth, Thomas, Hegner, Benedikt, Heinemann, Beate, Heinrich, Lukas, Heiss, Andreas, Hernández, José M., Hildreth, Michael, Hodgkinson, Mark, Hoeche, Stefan, Holzman, Burt, Hristov, Peter, Huang, Xingtao, Ivanchenko, Vladimir N., Ivanov, Todor, Iven, Jan, Jashal, Brij, Jayatilaka, Bodhitha, Jones, Roger, Jouvin, Michel, Jun, Soon Yung, Kagan, Michael, Kalderon, Charles William, Kane, Meghan, Karavakis, Edward, Katz, Daniel S., Kcira, Dorian, Keeble, Oliver, Kersevan, Borut Paul, Kirby, Michael, Klimentov, Alexei, Klute, Markus, Komarov, Ilya, Konstantinov, Dmitri, Koppenburg, Patrick, Kowalkowski, Jim, Kreczko, Luke, Kuhr, Thomas, Kutschke, Robert, Kuznetsov, Valentin, Lampl, Walter, Lancon, Eric, Lange, David, Lassnig, Mario, Laycock, Paul, Leggett, Charles, Letts, James, Lewendel, Birgit, Li, Teng, Lima, Guilherme, Linacre, Jacob, Linden, Tomas, Livny, Miron, Presti, Giuseppe Lo, Lopienski, Sebastian, Love, Peter, Lyon, Adam, Magini, Nicolò, Marshall, Zachary L., Martelli, Edoardo, Martin-Haugh, Stewart, Mato, Pere, Mazumdar, Kajari, McCauley, Thomas, McFayden, Josh, McKee, Shawn, McNab, Andrew, Mehdiyev, Rashid, Meinhard, Helge, Menasce, Dario, Lorenzo, Patricia Mendez, Mete, Alaettin Serhan, Michelotto, Michele, Mitrevski, Jovan, Moneta, Lorenzo, Morgan, Ben, Mount, Richard, Moyse, Edward, Murray, Sean, Nairz, Armin, Neubauer, Mark S., Norman, Andrew, Novaes, Sérgio, Novak, Mihaly, Oyanguren, Arantza, Ozturk, Nurcan, Pages, Andres Pacheco, Paganini, Michela, Pansanel, Jerome, Pascuzzi, Vincent R., Patrick, Glenn, Pearce, Alex, Pearson, Ben, Pedro, Kevin, Perdue, Gabriel, Yzquierdo, Antonio Perez-Calero, Perrozzi, Luca, Petersen, Troels, Petric, Marko, Petzold, Andreas, Piedra, Jónatan, Piilonen, Leo, Piparo, Danilo, Pivarski, Jim, Pokorski, Witold, Polci, Francesco, Potamianos, Karolos, Psihas, Fernanda, Navarro, Albert Puig, Quast, Günter, Raven, Gerhard, Reuter, Jürgen, Ribon, Alberto, Rinaldi, Lorenzo, Ritter, Martin, Robinson, James, Rodrigues, Eduardo, Roiser, Stefan, Rousseau, David, Roy, Gareth, Rybkine, Grigori, Sailer, Andre, Sakuma, Tai, Santana, Renato, Sartirana, Andrea, Schellman, Heidi, Schovancová, Jaroslava, Schramm, Steven, Schulz, Markus, Sciabà, Andrea, Seidel, Sally, Sekmen, Sezen, Serfon, Cedric, Severini, Horst, Sexton-Kennedy, Elizabeth, Seymour, Michael, Sgalaberna, Davide, Shapoval, Illya, Shiers, Jamie, Shiu, Jing-Ge, Short, Hannah, Siroli, Gian Piero, Skipsey, Sam, Smith, Tim, Snyder, Scott, Sokoloff, Michael D., Spentzouris, Panagiotis, Stadie, Hartmut, Stark, Giordon, Stewart, Gordon, Stewart, Graeme A., Sánchez, Arturo, Sánchez-Hernández, Alberto, Taffard, Anyes, Tamponi, Umberto, Templon, Jeff, Tenaglia, Giacomo, Tsulaia, Vakhtang, Tunnell, Christopher, Vaandering, Eric, Valassi, Andrea, Vallecorsa, Sofia, Valsan, Liviu, Van Gemmeren, Peter, Vernet, Renaud, Viren, Brett, Vlimant, Jean-Roch, Voss, Christian, Votava, Margaret, Vuosalo, Carl, Sierra, Carlos Vázquez, Wartel, Romain, Watts, Gordon T., Wenaus, Torre, Wenzel, Sandro, Williams, Mike, Winklmeier, Frank, Wissing, Christoph, Wuerthwein, Frank, Wynne, Benjamin, Xiaomei, Zhang, Yang, Wei, and Yazgan, Efe
Subjects: Physics - Computational Physics, High Energy Physics - Experiment
Abstract: Particle physics has an ambitious and broad experimental programme for the coming decades. This programme requires large investments in detector hardware, either to build new facilities and experiments, or to upgrade existing ones. Similarly, it requires commensurate investment in the R&D of software to acquire, manage, process, and analyse the shear amounts of data to be recorded. In planning for the HL-LHC in particular, it is critical that all of the collaborating stakeholders agree on the software goals and priorities, and that the efforts complement each other. In this spirit, this white paper describes the R&D activities required to prepare for this software upgrade.
Published: 2017
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4. New results on Higgs boson properties

Author: Piedra, Jónatan
Subjects: High Energy Physics - Experiment
Abstract: We present the latest ATLAS and CMS measurements of several properties of the Higgs boson, such as signal-strength modifiers for the main production modes, fiducial and differential cross sections, and the Higgs mass. We have analyzed the 13 TeV proton-proton LHC collision data recorded in 2016, corresponding to integrated luminosities up to $36.1~{\rm fb}^{-1}$. Results for the ${\rm H\to ZZ}\to 4\ell$ (${\rm \ell = e\mu}$), ${\rm H}\to\gamma\gamma$, and ${\rm H}\to\tau\tau$ decay channels are presented. In addition, searches for new phenomena in the ${\rm H}\to\gamma\gamma + E_{\rm T}^{\rm miss}$ and ${\rm H}\to{\rm b\bar{b}} + E_{\rm T}^{\rm miss}$ decay channels are presented.
Published: 2017

5. Search for light Higgs bosons from supersymmetric cascade decays in pp collisions at √s=13TeV

Author: SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search is reported for pairs of light Higgs bosons (H1) produced in supersymmetric cascade decays in final states with small missing transverse momentum. A data set of LHC pp collisions collected with the CMS detector at √s = 13 TeV and corresponding to an integrated luminosity of 138 fb−1 is used. The search targets events where both H1 bosons decay into bb pairs that are reconstructed ¯as large-radius jets using substructure techniques. No evidence is found for an excess of events beyond the background expectations of the standard model (SM). Results from the search are interpreted in the next-to-minimal supersymmetric extension of the SM, where a “singlino” of small mass leads to squark and gluino cascade decays that can predominantly end in a highly Lorentz-boosted singlet-like H1 and a singlino-like neutralino of small transverse momentum. Upper limits are set on the product of the squark or gluino pair production cross section and the square of the bb branching ¯fraction of the H1 in a benchmark model containing almost mass-degenerate gluinos and light-flavour squarks. Under the assumption of an SM-like H1 → bb branching fraction, H ¯ 1 bosons with masses in the range 40–120 GeV arising from the decays of squarks or gluinos with a mass of 1200–2500 GeV are excluded at 95% confidence level.
Published: 2023

6. Search for a charged Higgs boson decaying into a heavy neutral Higgs boson and a W boson in proton-proton collisions at √s = 13 TeV

Author: Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for a charged Higgs boson H± decaying into a heavy neutral Higgs boson H and a W boson is presented. The analysis targets the H decay into a pair of tau leptons with at least one of them decaying hadronically and with an additional electron or muon present in the event. The search is based on proton-proton collision data recorded by the CMS experiment during 2016–2018 at √s = 13 TeV, corresponding to an integrated luminosity of 138 fb−1. The data are consistent with standard model background expectations. Upper limits at 95% confidence level are set on the product of the cross section and branching fraction for an H± in the mass range of 300–700 GeV, assuming an H with a mass of 200 GeV. The observed limits range from 0.085 pb for an H± mass of 300 GeV to 0.019 pb for a mass of 700 GeV. These are the first limits on H± production in the H± → HW±decay channel at the LHC.
Published: 2023

7. Performance of the local reconstruction algorithms for the CMS hadron calorimeter with Run 2 data

Author: Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, Ministerio de Ciencia e Innovación (España), Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, Ministerio de Ciencia e Innovación (España), Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: A description is presented of the algorithms used to reconstruct energy deposited in the CMS hadron calorimeter during Run 2 (2015–2018) of the LHC. During Run 2, the characteristic bunch-crossing spacing for proton-proton collisions was 25 ns, which resulted in overlapping signals from adjacent crossings. The energy corresponding to a particular bunch crossing of interest is estimated using the known pulse shapes of energy depositions in the calorimeter, which are measured as functions of both energy and time. A variety of algorithms were developed to mitigate the effects of adjacent bunch crossings on local energy reconstruction in the hadron calorimeter in Run 2, and their performance is compared.
Published: 2023

8. The analytical method algorithm for trigger primitives generation at the LHC drift tubes detector

Author: Federal Ministry of Education and Research (Germany), Istituto Nazionale di Fisica Nucleare, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, Hungarian Scientific Research Fund, Abbiendi, G., Alcaraz Maestre, J., Calderon, Alicia, Bedoya, C. F., Piedra, Jonatan, Trevisani, N., Federal Ministry of Education and Research (Germany), Istituto Nazionale di Fisica Nucleare, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, Hungarian Scientific Research Fund, Abbiendi, G., Alcaraz Maestre, J., Calderon, Alicia, Bedoya, C. F., Piedra, Jonatan, and Trevisani, N.
Abstract: The Compact Muon Solenoid (CMS) experiment prepares its Phase-2 upgrade for the high-luminosity era of the LHC operation (HL-LHC). Due to the increase of occupancy, trigger latency and rates, the full electronics of the CMS Drift Tube (DT) chambers will need to be replaced. In the new design, the time bin for the digitization of the chamber signals will be of around 1 ns, and the totality of the signals will be forwarded asynchronously to the service cavern at full resolution. The new backend system will be in charge of building the trigger primitives of each chamber. These trigger primitives contain the information at chamber level about the muon candidates position, direction, and collision time, and are used as input in the L1 CMS trigger. The added functionalities will improve the robustness of the system against ageing. An algorithm based on analytical solutions for reconstructing the DT trigger primitives, called Analytical Method, has been implemented both as a software C++ emulator and in firmware. Its performance has been estimated using the software emulator with simulated and real data samples, and through hardware implementation tests. Measured efficiencies are 96 to 98% for all qualities and time and spatial resolutions are close to the ultimate performance of the DT chambers. A prototype chain of the HL-LHC electronics using the Analytical Method for trigger primitive generation has been installed during Long Shutdown 2 of the LHC and operated in CMS cosmic data taking campaigns in 2020 and 2021. Results from this validation step, the so-called Slice Test, are presented.
Published: 2023

9. Search for medium effects using jets from bottom quarks in PbPb collisions at √sNN=5.02 TeV

Author: SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: The first study of the shapes of jets arising from bottom (b) quarks in heavy ion collisions is presented. Jet shapes are studied using charged hadron constituents as a function of their radial distance from the jet axis. Lead-lead (PbPb) collision data at a nucleon-nucleon center-of-mass energy of √sNN = 5.02 TeV were recorded by the CMS detector at the LHC, with an integrated luminosity of 1.69 nb−1. Compared to proton-proton collisions, a redistribution of the energy in b jets to larger distances from the jet axis is observed in PbPb collisions. This medium-induced redistribution is found to be substantially larger for b jets than for inclusive jets.
Published: 2023

10. Search for nonresonant Higgs boson pair production in final state with two bottom quarks and two tau leptons in proton-proton collisions at √s=13 TeV

Author: SCOAP, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Principado de Asturias, European Commission, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, SCOAP, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Principado de Asturias, European Commission, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: A search for the nonresonant production of Higgs boson pairs (HH) via gluon-gluon and vector boson fusion processes in final states with two bottom quarks and two tau leptons is presented. The search uses data from proton-proton collisions at a center-of-mass energy of √s = 13 TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 138 fb−1. Events in which at least one tau lepton decays hadronically are considered and multiple machine learning techniques are used to identify and extract the signal. The data are found to be consistent, within uncertainties, with the standard model (SM) predictions. Upper limits on the HH production cross section are set to constrain the parameter space for anomalous Higgs boson couplings. The observed (expected) upper limit at 95% confidence level corresponds to 3.3 (5.2) times the SM prediction for the inclusive HH cross section and to 124 (154) times the SM prediction for the vector boson fusion HH cross section. At 95% confidence level, the Higgs field self-coupling is constrained to be within −1.7 and 8.7 times the SM expectation, and the coupling of two Higgs bosons to two vector bosons is constrained to be within −0.4 and 2.6 times the SM expectation.
Published: 2023

11. Test beam performance of a CBC3-based mini-module for the Phase-2 CMS Outer Tracker before and after neutron irradiation

Author: Department of Energy (US), European Organization for Nuclear Research, German Research Foundation, Ministerio de Economía y Competitividad (España), Istituto Nazionale di Fisica Nucleare, European Commission, Science and Technology Facilities Council (UK), National Science Foundation (US), Academy of Finland, CMS Tracker collaboration, Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Gómez, Gervasio, González Sánchez, J., Jaramillo, R., Lasaosa, Clara, Moya, David, Piedra, Jonatan, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, López Virto, A., Vizán, J., Department of Energy (US), European Organization for Nuclear Research, German Research Foundation, Ministerio de Economía y Competitividad (España), Istituto Nazionale di Fisica Nucleare, European Commission, Science and Technology Facilities Council (UK), National Science Foundation (US), Academy of Finland, CMS Tracker collaboration, Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Gómez, Gervasio, González Sánchez, J., Jaramillo, R., Lasaosa, Clara, Moya, David, Piedra, Jonatan, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, López Virto, A., and Vizán, J.
Abstract: The Large Hadron Collider (LHC) at CERN will undergo major upgrades to increase the instantaneous luminosity up to 5–7.5×1034 cm-2s-1. This High Luminosity upgrade of the LHC (HL-LHC) will deliver a total of 3000–4000 fb-1 of proton-proton collisions at a center-of-mass energy of 13–14 TeV. To cope with these challenging environmental conditions, the strip tracker of the CMS experiment will be upgraded using modules with two closely-spaced silicon sensors to provide information to include tracking in the Level-1 trigger selection. This paper describes the performance, in a test beam experiment, of the first prototype module based on the final version of the CMS Binary Chip front-end ASIC before and after the module was irradiated with neutrons. Results demonstrate that the prototype module satisfies the requirements, providing efficient tracking information, after being irradiated with a total fluence comparable to the one expected through the lifetime of the experiment.
Published: 2023

12. Observation of same-sign WW production from double parton scattering in proton-proton collisions at √s = 13 TeV

Author: SCOAP, Science and Technology Facilities Council (UK), Ministerio de Ciencia, Innovación y Universidades (España), National Science Foundation (US), Agencia Estatal de Investigación (España), European Commission, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, SCOAP, Science and Technology Facilities Council (UK), Ministerio de Ciencia, Innovación y Universidades (España), National Science Foundation (US), Agencia Estatal de Investigación (España), European Commission, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: The first observation of the production of W±W± bosons from double parton scattering processes using same-sign electron-muon and dimuon events in proton-proton collisions is reported. The data sample corresponds to an integrated luminosity of 138fb−1 recorded at a center-of-mass energy of 13 TeV using the CMS detector at the CERN LHC. Multivariate discriminants are used to distinguish the signal process from the main backgrounds. A binned maximum likelihood fit is performed to extract the signal cross section. The measured cross section for production of same-sign W bosons decaying leptonically is 80.7±11.2(stat) +9.5−8.6(syst)±12.1(model)fb, whereas the measured fiducial cross section is 6.28±0.81(stat)±0.69(syst)±0.37(model)fb. The observed significance of the signal is 6.2 standard deviations above the background-only hypothesis.
Published: 2023

13. Search for narrow resonances in the b-tagged dijet mass spectrum in proton-proton collisions at √s = 13 TeV

Author: SCOAP, European Commission, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), European Research Council, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, SCOAP, European Commission, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), European Research Council, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: A search is performed for narrow resonances decaying to final states of two jets, with at least one jet originating from a b quark, in proton-proton collisions at √s=13TeV. The data set corresponds to an integrated luminosity of 138fb−1 collected with the CMS detector at the LHC. Jets originating from energetic b hadrons are identified through a b-tagging algorithm that utilizes a deep neural network or the presence of a muon inside a jet. The invariant mass spectrum of jet pairs is well described by a smooth parametrization and no evidence for the production of new particles is observed. Upper limits on the production cross section are set for excited b quarks and other resonances decaying to dijet final states containing b quarks. These limits exclude at 95% confidence level models of Z′ bosons with masses from 1.8 TeV to 2.4 TeV and of excited b quarks with masses from 1.8 TeV to 4.0 TeV. This is the most stringent exclusion of excited b quarks to date.
Published: 2023

14. Precision measurement of the Z boson invisible width in pp collisions at √s=13 TeV

Author: SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A precise measurement of the invisible width of the Z boson produced in proton-proton collisions at a center-of-mass energy of 13 TeV is presented using data recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36.3 fb−1. The result is obtained from a simultaneous fit to kinematic distributions for two data samples of Z boson plus jets: one dominated by Z boson decays to invisible particles and the other by Z boson decays to muon and electron pairs. The invisible width is measured to be 523 ± 3 (stat) ± 16 (syst)MeV. This result is the first precise measurement of the invisible width of the Z boson at a hadron collider, and is the single most precise direct measurement to date, competitive with the combined result of the direct measurements from the LEP experiments.
Published: 2023

15. Search for CP violating top quark couplings in pp collisions at √s = 13 TeV

Author: SCOAP, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., SCOAP, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Abstract: Results are presented from a search for CP violation in top quark pair production, using proton-proton collisions at a center-of-mass energy of 13 TeV. The data used for this analysis consist of final states with two charged leptons collected by the CMS experiment, and correspond to an integrated luminosity of 35.9 fb−1. The search uses two observables, O1 and O3, which are Lorentz scalars. The observable O1 is constructed from the four-momenta of the charged leptons and the reconstructed top quarks, while O3 consists of the four-momenta of the charged leptons and the b quarks originating from the top quarks. Asymmetries in these observables are sensitive to CP violation, and their measurement is used to determine the chromoelectric dipole moment of the top quark. The results are consistent with the expectation from the standard model.
Published: 2023

16. Proton reconstruction with the CMS-TOTEM precision proton spectrometer

Author: European Commission, Ministerio de Ciencia e Innovación (España), European Research Council, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, European Commission, Ministerio de Ciencia e Innovación (España), European Research Council, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: The Precision Proton Spectrometer (PPS) of the CMS and TOTEM experiments collected 107.7 fb-1 in proton-proton (pp) collisions at the LHC at 13 TeV (Run 2). This paper describes the key features of the PPS alignment and optics calibrations, the proton reconstruction procedure, as well as the detector efficiency and the performance of the PPS simulation. The reconstruction and simulation are validated using a sample of (semi)exclusive dilepton events. The performance of PPS has proven the feasibility of continuously operating a near-beam proton spectrometer at a high luminosity hadron collider.
Published: 2023

17. Search for CP violation using t¯t events in the lepton+jets channel in pp collisions at √s = 13 TeV

Author: European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, Ministerio de Ciencia e Innovación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, Ministerio de Ciencia e Innovación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: Results are presented on a search for CP violation in the production and decay of top quark-antiquark pairs in the lepton+jets channel. The search is based on data from proton-proton collisions at √s = 13 TeV, collected with the CMS detector, corresponding to an integrated luminosity of 138 fb−1. Possible CP violation effects are evaluated by measuring asymmetries in observables constructed from linearly independent four-momentum vectors of the final-state particles. The dimensionless chromoelectric dipole moment of the top quark obtained from the observed asymmetries is measured to be 0.04±0.10 (stat)±0.07(syst), and the asymmetries exhibit no evidence for CP-violating effects, consistent with expectations from the standard model.
Published: 2023

18. Search for a massive scalar resonance decaying to a light scalar and a Higgs boson in the four b quarks final state with boosted topology

Author: SCOAP, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Principado de Asturias, Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Principado de Asturias, Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: We search for new massive scalar particles X and Y through the resonant process X → YH → bbb¯ b, ¯ where H is the standard model Higgs boson. Data from CERN LHC proton-proton collisions are used, collected at a centre-of-mass energy of 13 TeV in 2016–2018 and corresponding to an integrated luminosity of 138 fb−1. The search is performed in mass ranges of 0.9–4 TeV for X and 60–600 GeV for Y, where both Y and H are reconstructed as Lorentz-boosted single large-area jets. The results are interpreted in the context of the next-to-minimal supersymmetric standard model and also in an extension of the standard model with two additional singlet scalar fields. The 95% confidence level upper limits for the production cross section vary between 0.1 and 150 fb depending on the X and Y masses, and represent a significant improvement over results from previous searches.
Published: 2023

19. Measurement of the top quark mass using a profile likelihood approach with the lepton + jets final states in proton–proton collisions at √s=13TeV

Author: SCOAP, European Commission, National Aeronautics and Space Administration (US), National Science Foundation (US), European Research Council, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Principado de Asturias, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, SCOAP, European Commission, National Aeronautics and Space Administration (US), National Science Foundation (US), European Research Council, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Principado de Asturias, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: The mass of the top quark is measured in 36.3 fb−1 of LHC proton–proton collision data collected with the CMS detector at √s = 13 TeV. The measurement uses a sample of top quark pair candidate events containing one isolated electron or muon and at least four jets in the final state. For each event, the mass is reconstructed from a kinematic fit of the decay products to a top quark pair hypothesis. A profile likelihood method is applied using up to four observables per event to extract the top quark mass. The top quark mass is measured to be 171.77 ± 0.37 GeV. This approach significantly improves the precision over previous measurements.
Published: 2023

20. Search for new heavy resonances decaying to WW, WZ, ZZ, WH, or ZH boson pairs in the all-jets final state in proton-proton collisions at √s = 13 TeV

Author: SCOAP, European Commission, European Research Council, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, European Commission, European Research Council, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for new heavy resonances decaying to WW, WZ, ZZ, WH, or ZH boson pairs in the all-jets final state is presented. The analysis is based on proton-proton collision data recorded by the CMS detector in 2016–2018 at a centre-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 138 fb−1. The search is sensitive to resonances with masses between 1.3 and 6 TeV, decaying to bosons that are highly Lorentz-boosted such that each of the bosons forms a single large-radius jet. Machine learning techniques are employed to identify such jets. No significant excess over the estimated standard model background is observed. A maximum local significance of 3.6 standard deviations, corresponding to a global significance of 2.3 standard deviations, is observed at masses of 2.1 and 2.9 TeV. In a heavy vector triplet model, spin-1 Z and W resonances with masses below 4.8 TeV are excluded at the 95% confidence level (CL). These limits are the most stringent to date. In a bulk graviton model, spin-2 gravitons and spin-0 radions with masses below 1.4 and 2.7 TeV, respectively, are excluded at 95% CL. Production of heavy resonances through vector boson fusion is constrained with upper cross section limits at 95% CL as low as 0.1 fb.
Published: 2023

21. Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson

Author: SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: A data sample containing top quark pairs (t¯t) produced in association with a Lorentz-boosted Z or Higgs boson is used to search for signs of new physics using effective field theory. The data correspond to an integrated luminosity of 138 fb−1 of proton-proton collisions produced at a center-of-mass energy of 13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton and hadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jet with high transverse momentum identified as a Z or Higgs boson decaying to a bottom quark pair. Machine learning techniques are employed to discriminate between t¯tZ or t¯tH events and events from background processes, which are dominated by t¯t þ jets production. No indications of new physics are observed. The signal strengths of boosted t¯tZ and t¯tH production are measured, and upper limits are placed on the t¯tZ and t¯tH differential cross sections as functions of the Z or Higgs boson transverse momentum. The effects of new physics are probed using a framework in which the standard model is considered to be the low-energy effective field theory of a higher energy scale theory. Eight possible dimension-six operators are added to the standard model Lagrangian, and their corresponding coefficients are constrained via fits to the data.
Published: 2023

22. Observation of electroweak W+W− pair production in association with two jets in proton-proton collisions at √s = 13 TeV

Author: European Commission, European Research Council, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., European Commission, European Research Council, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: An observation is reported of the electroweak production of a W+W− pair in association with two jets, with both W bosons decaying leptonically. The data sample corresponds to an integrated luminosity of 138 fb−1 of proton-proton collisions at √s = 13 TeV, collected by the CMS detector at the CERN LHC. Events are selected by requiring exactly two opposite-sign leptons (electrons or muons) and two jets with large pseudorapidity separation and high dijet invariant mass. Events are categorized based on the flavor of the final-state leptons. A signal is observed with a significance of 5.6 standard deviations (5.2 expected) with respect to the background-only hypothesis. The measured fiducial cross section is 10.2 ± 2.0 fb and this value is consistent with the standard model prediction of 9.1 ± 0.6 fb.
Published: 2023

23. Evidence for four-top quark production in proton-proton collisions at √s=13TeV

Author: Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: The production of four top quarks (ttt¯ t)¯ is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13 TeV, and corresponding to integrated luminosities of up to 138 fb−1. Events that have no leptons (all-hadronic), one lepton, or two oppositesign leptons (where lepton refers only to prompt electrons or prompt muons) are considered. This is the first ttt¯ t measurement ¯ that includes the all-hadronic final state. The observed significance of the ttt¯ t¯ signal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for ttt¯ t production, ¯with a measured cross section of 36+12−11 fb. Combined with earlier CMS results in other final states, the signal significance is 4.0 standard deviations (3.2 expected). The combination returns an observed cross section of 17 ± 4 (stat) ± 3 (syst) fb, which is consistent with the standard model prediction.
Published: 2023

24. CMS pythia 8 colour reconnection tunes based on underlying-event data

Author: Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Principado de Asturias, European Research Council, European Commission, Agencia Estatal de Investigación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Principado de Asturias, European Research Council, European Commission, Agencia Estatal de Investigación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia 8 event generator, are obtained based on the default CMS pythia 8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies √s=7 and 13TeV, and by the CDF experiment at 1.96TeV are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13TeV including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (t¯t) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of t¯t events in the semileptonic channel at 13TeV.
Published: 2023

25. A search for decays of the Higgs boson to invisible particles in events with a top-antitop quark pair or a vector boson in proton-proton collisions at √s = 13TeV

Author: SCOAP, European Commission, European Research Council, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, European Commission, European Research Council, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or a vector boson, which both decay to a fully hadronic final state, has been performed using proton-proton collision data collected at √s = 13 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb−1. The 95% confidence level upper limit set on the branching fraction of the 125 GeV Higgs boson to invisible particles, B(H → inv), is 0.54 (0.39 expected), assuming standard model production cross sections. The results of this analysis are combined with previous B(H → inv) searches carried out at √s = 7, 8, and 13 TeV in complementary production modes. The combined upper limit at 95% confidence level on B(H → inv) is 0.15 (0.08 expected).
Published: 2023

26. Azimuthal correlations within exclusive dijets with large momentum transfer in photon-lead collisions

Author: CMS Collaboration, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: The structure of nucleons is multidimensional and depends on the transverse momenta, spatial geometry, and polarization of the constituent partons. Such a structure can be studied using high-energy photons produced in ultraperipheral heavy-ion collisions. The first measurement of the azimuthal angular correlations of exclusively produced events with two jets in photon-lead interactions at large momentum transfer is presented, a process that is considered to be sensitive to the underlying nuclear gluon polarization. This study uses a data sample of ultraperipheral lead-lead collisions at √sNN=5.02TeV, corresponding to an integrated luminosity of 0.38 nb−1, collected with the CMS experiment at the LHC. The measured second harmonic of the correlation between the sum and difference of the two jet transverse momentum vectors is found to be positive, and rising, as the dijet transverse momentum increases. A well-tuned model that has been successful at describing a wide range of proton scattering data from the HERA experiments fails to describe the observed correlations, suggesting the presence of gluon polarization effects.
Published: 2023

27. Measurement of differential cross sections for the production of a Z boson in association with jets in proton-proton collisions at Formula Presented

Author: SCOAP, European Commission, European Research Council, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), German Research Foundation, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., CMS Collaboration, SCOAP, European Commission, European Research Council, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), German Research Foundation, Tumasyan, Armen, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: A measurement is presented of the production of Z bosons that decay into two electrons or muons in association with jets, in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS Collaboration at the LHC with an integrated luminosity of 35.9fb-1. The differential cross sections are measured as a function of the transverse momentum (pT) of the Z boson and the transverse momentum and rapidities of the five jets with largest pT. The jet multiplicity distribution is measured for up to eight jets. The hadronic activity in the events is estimated using the scalar sum of the pT of all the jets. All measurements are unfolded to the stable-particle level and compared with predictions from various Monte Carlo event generators, as well as with expectations at leading and next-to-leading orders in perturbative quantum chromodynamics.
Published: 2023

28. Search for the Higgs boson decay to a pair of electrons in proton-proton collisions at √s=13TeV

Author: SCOAP, European Organization for Nuclear Research, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, European Organization for Nuclear Research, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search is presented for the Higgs boson decay to a pair of electrons (e+e−) in proton-proton collisions at √s = 13 TeV. The data set was collected with the CMS experiment at the LHC between 2016 and 2018, corresponding to an integrated luminosity of 138 fb−1. The analysis uses event categories targeting Higgs boson production via gluon fusion and vector boson fusion. The observed upper limit on the Higgs boson branching fraction to an electron pair is 3.0 × 10−4 (3.0 × 10−4 expected) at the 95% confidence level, which is the most stringent limit on this branching fraction to date.
Published: 2023

29. First measurement of the forward rapidity gap distribution in pPb collisions at √sNN = 8.16 TeV

Author: SCOAP, European Commission, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Tumasyan, Armen, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., CMS Collaboration, SCOAP, European Commission, Principado de Asturias, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Tumasyan, Armen, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., and CMS Collaboration
Abstract: For the first time at LHC energies, the forward rapidity gap spectra from proton-lead collisions for both proton and lead dissociation processes are presented. The analysis is performed over 10.4 units of pseudorapidity at a center-of-mass energy per nucleon pair of √sNN=8.16TeV, almost 300 times higher than in previous measurements of diffractive production in proton-nucleus collisions. For lead dissociation processes, which correspond to the pomeron-lead event topology, the epos-lhc generator predictions are a factor of 2 below the data, but the model gives a reasonable description of the rapidity gap spectrum shape. For the pomeron-proton topology, the epos-lhc, qgsjet ii, and hijing predictions are all at least a factor of 5 lower than the data. The latter effect might be explained by a significant contribution of ultraperipheral photoproduction events mimicking the signature of diffractive processes. These data may be of significant help in understanding the high energy limit of quantum chromodynamics and for modeling cosmic ray air showers.
Published: 2023

30. Measurement of the differential tt ¯ production cross section as a function of the jet mass and extraction of the top quark mass in hadronic decays of boosted top quarks

Author: Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A measurement of the jet mass distribution in hadronic decays of Lorentz-boosted top quarks is presented. The measurement is performed in the lepton + jets channel of top quark pair production (tt) events, where the lepton is an electron or muon. The products of the hadronic top quark decay are reconstructed using a single large-radius jet with transverse momentum greater than 400 GeV. The data were collected with the CMS detector at the LHC in protonproton collisions and correspond to an integrated luminosity of 138 fb−1. The differential tt production cross section as a function of the jet mass is unfolded to the particle level and is used to extract the top quark mass. The jet mass scale is calibrated using the hadronic W boson decay within the large-radius jet. The uncertainties in the modelling of the final state radiation are reduced by studying angular correlations in the jet substructure. These developments lead to a significant increase in precision, and a top quark mass of 173.06 ± 0.84 GeV.
Published: 2023

31. Measurement of the tt¯ charge asymmetry in events with highly Lorentz-boosted top quarks in pp collisions at √s = 13TeV

Author: Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Principado de Asturias, European Research Council, Ministerio de Ciencia e Innovación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Principado de Asturias, European Research Council, Ministerio de Ciencia e Innovación (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., García Alonso, A., Gómez, Gervasio, Lasaosa, Clara, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: The measurement of the charge asymmetry in top quark pair events with highly Lorentz-boosted top quarks decaying to a single lepton and jets is presented. The analysis is performed using protonproton collisions at √s = 13 TeV with the CMS detector at the LHC and corresponding to an integrated luminosity of 138 fb−1. The selection is optimized for top quarks produced with large Lorentz boosts, resulting in nonisolated leptons and overlapping jets. The top quark charge asymmetry is measured for events with a tt invariant ¯ mass larger than 750 GeV and corrected for detector and acceptance effects using a binned maximum likelihood fit. The measured top quark charge asymmetry of (0.42+0.64−0.69)% is in good agreement with the standard model prediction at next-to-next-to-leading order in quantum chromodynamic perturbation theory with next-to-leading-order electroweak corrections. The result is also presented for two invariant mass ranges, 750–900 and >900 GeV.
Published: 2023

32. Search for flavor-changing neutral current interactions of the top quark and Higgs boson in final states with two photons in proton-proton collisions at √ s = 13 TeV

Author: CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández, M., Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, G., Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Universidad de Cantabria, and SCOAP
Abstract: CMS collaboration: et al., Proton-proton interactions resulting in final states with two photons are studied in a search for the signature of flavor-changing neutral current interactions of top quarks (t) and Higgs bosons (H). The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 137fb−1. No significant excess above the background prediction is observed. Upper limits on the branching fractions (B) of the top quark decaying to a Higgs boson and an up (u) or charm (c) quark are derived through a binned fit to the diphoton invariant mass spectrum. The observed (expected) 95% confidence level upper limits are found to be 0.019% (0.031%) for B(t→Hu) and 0.073% (0.051%) for B(t→Hc). These are the strictest upper limits yet determined., Funded by SCOAP3.
Published: 2022

33. Probing charm quark dynamics via multiparticle correlations in Pb-Pb collisions at √sNN=5.02 TeV

Author: CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández, M., Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, G., Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Universidad de Cantabria, and SCOAP
Abstract: CMS collaboration: et al., Multiparticle azimuthal correlations of prompt D0 mesons are measured in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of √sNN=5.02 TeV . For the first time, a four-particle cumulant method is used to extract the second Fourier coefficient of the azimuthal distribution (v2) of D0 mesons as a function of event centrality and the D0 transverse momentum. The ratios of the four-particle v2 values to previously measured two-particle cumulant results provide direct experimental access to event-by-event fluctuations of charm quark azimuthal anisotropies. These ratios are also found to be comparable to those of inclusive charged particles in the event. However, hints of deviations are seen in the most central and peripheral collisions. To investigate the origin of flow fluctuations in the charm sector, these measurements are compared to a model implementing fluctuations of charm quark energy loss via collisional or radiative processes in the quark-gluon plasma. These models cannot quantitatively describe the data over the full transverse momentum and centrality ranges, although the calculations with collisional energy loss provide a better description of the data., Funded by SCOAP3.
Published: 2022

34. Measurement of the production cross section for Z+b jets in proton-proton collisions at √ s = 13 TeV

Author: CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández, M., Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, G., Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Universidad de Cantabria, SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Agencia Estatal de Investigación (España), and Principado de Asturias
Abstract: CMS Collaboration: et al., The measurement of the cross section for the production of a Z boson, decaying to dielectrons or dimuons, in association with at least one bottom quark jet is performed with proton-proton collision data at √s=13 TeV. The data sample corresponds to an integrated luminosity of 137 fb−1, collected by the CMS experiment at the LHC during 2016–2018. The integrated cross sections for Z+≥1bjet and Z+≥2bjets are reported for the electron, muon, and combined channels. The fiducial cross sections in the combined channel are 6.52±0.04(stat)±0.40(syst)±0.14(theo)pb for Z+≥1bjet and 0.65±0.03(stat)±0.07(syst)±0.02(theo) pb for Z+≥2b jets. The differential cross section distributions are measured as functions of various kinematic observables that are useful for precision tests of perturbative quantum chromodynamics predictions. The ratios of integrated and differential cross sections for Z+≥2b jets and Z+≥1 b jet processes are also determined. The value of the integrated cross section ratio measured in the combined channel is 0.100±0.005(stat)±0.007(syst)±0.003(theo). All measurements are compared with predictions from various event generators., Funded by SCOAP3., Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contracts No. 675440, No. 724704, No. 752730, No. 758316, No. 765710, 824093, No. 884104, and COST Action No. CA16108 (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the F. R. S.-FNRS and FWO (Belgium) under the “Excellence of Science—EOS“—be.h Project No. 30820817; the Beijing Municipal Science & Technology Commission, No. Z191100007219010; the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Deutsche Forschungsgemeinschaft (DFG), under Germany’s Excellence Strategy—EXC 2121 “Quantum Universe”—390833306, and under Project No. 400140256—GRK2497; the Lendület (“Momentum”) Program and the János Bolyai Research Scholarship of the Hungarian Academy of Sciences, the New National Excellence Program ÚNKP, the NKFIA research grants No. 123842, No. 123959, No. 124845, No. 124850, No. 125105, No. 128713, No. 128786, and No. 129058 (Hungary); the Council of Science and Industrial Research, India; the Latvian Council of Science; the Ministry of Science and Higher Education and the National Science Center, contracts Opus 2014/15/B/ST2/03998 and 2015/19/B/ST2/02861 (Poland); the Fundação para a Ciência e a Tecnologia, Grant No. CEECIND/01334/2018 (Portugal); the National Priorities Research Program by Qatar National Research Fund; the Ministry of Science and Higher Education, Projects No. 14.W03.31.0026 and No. FSWW-2020-0008, and the Russian Foundation for Basic Research, Project No. 19-42-703014 (Russia); MCIN/AEI/10.13039/501100011033, ERDF “a way of making Europe”, and the Programa Estatal de Fomento de la Investigación Científica y T´ecnica de Excelencia María de Maeztu, grant No. MDM-2017-0765 and Programa Severo Ochoa del Principado de Asturias (Spain); the Stavros Niarchos Foundation (Greece); the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); the Kavli Foundation; the Nvidia Corporation; the SuperMicro Corporation; the Welch Foundation, Contract NO. C-1845; and the Weston Havens Foundation (USA).
Published: 2022

35. The International Linear Collider: Report to Snow mass 2021

Author: German Research Foundation, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Generalitat Valenciana, Consejo Superior de Investigaciones Científicas (España), Japan Society for the Promotion of Science, Department of Energy (US), European Commission, National Research Foundation of Korea, National Science Foundation (US), Istituto Nazionale di Fisica Nucleare, ILC International Development Team, Fernández-García, Marcos, Fullana, Esteban, Fuster, Juan, Irles Quiles, Adrián, Mandal, Sanjoy, Martínez-Rivero, Celso, Miralles, Víctor, Miralles López, Marcos, Moreno Llácer, María, Piedra, Jonatan, Ruiz Jimeno, Alberto, Vila, Iván, Yamamoto, Hitoshi, ILC community, German Research Foundation, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Generalitat Valenciana, Consejo Superior de Investigaciones Científicas (España), Japan Society for the Promotion of Science, Department of Energy (US), European Commission, National Research Foundation of Korea, National Science Foundation (US), Istituto Nazionale di Fisica Nucleare, ILC International Development Team, Fernández-García, Marcos, Fullana, Esteban, Fuster, Juan, Irles Quiles, Adrián, Mandal, Sanjoy, Martínez-Rivero, Celso, Miralles, Víctor, Miralles López, Marcos, Moreno Llácer, María, Piedra, Jonatan, Ruiz Jimeno, Alberto, Vila, Iván, Yamamoto, Hitoshi, and ILC community
Abstract: The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community.
Published: 2022

36. Beam test performance of a prototype module with Short Strip ASICs for the CMS HL-LHC tracker upgrade

Author: European Commission, CMS Collaboration, Osherson, Marc, Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Gómez, Gervasio, González Sánchez, J., Jaramillo, R., Lasaosa, Clara, Moya, David, Piedra, Jonatan, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, López Virto, A., Vizán, J., European Commission, CMS Collaboration, Osherson, Marc, Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Gómez, Gervasio, González Sánchez, J., Jaramillo, R., Lasaosa, Clara, Moya, David, Piedra, Jonatan, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, López Virto, A., and Vizán, J.
Abstract: The Short Strip ASIC (SSA) is one of the four front-end chips designed for the upgrade of the CMS Outer Tracker for the High Luminosity LHC. Together with the Macro-Pixel ASIC (MPA) it will instrument modules containing a strip and a macro-pixel sensor stacked on top of each other. The SSA provides both full readout of the strip hit information when triggered, and, together with the MPA, correlated clusters called stubs from the two sensors for use by the CMS Level-1 (L1) trigger system. Results from the first prototype module consisting of a sensor and two SSA chips are presented. The prototype module has been characterized at the Fermilab Test Beam Facility using a 120 GeV proton beam.
Published: 2022

37. Search for resonances decaying to three W bosons in proton-proton collisions at √s = 13 TeV

Author: SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for resonances decaying into a W boson and a radion, where the radion decays into two W bosons, is presented. The data analyzed correspond to an integrated luminosity of 138fb−1 recorded in proton-proton collisions with the CMS detector at √s=13TeV. One isolated charged lepton is required, together with missing transverse momentum and one or two massive large-radius jets, containing the decay products of either two or one W bosons, respectively. No excess over the background estimation is observed. The results are combined with those from a complementary channel with an all-hadronic final state, described in an accompanying paper. Limits are set on parameters of an extended warped extra-dimensional model. These searches are the first of their kind at the LHC.
Published: 2022

38. Search for resonances decaying to three W bosons in the hadronic final state in proton-proton collisions at √s = 13 TeV

Author: SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), Principado de Asturias, European Commission, European Research Council, Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), Principado de Asturias, European Commission, European Research Council, Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for Kaluza-Klein excited vector boson resonances, WKK, decaying in cascade to three W bosons via a scalar radion R, WKK→WR→WWW, in a final state containing two or three massive jets is presented. The search is performed with √s=13TeV proton-proton collision data collected by the CMS experiment at the CERN LHC during 2016–2018, corresponding to an integrated luminosity of 138fb−1. Two final states are simultaneously probed, one where the two W bosons produced by the R decay are reconstructed as separate, large-radius, massive jets, and one where they are merged into a single large-radius jet. The observed data are in agreement with the standard model expectations. Limits are set on the product of the WKK resonance cross section and branching fraction to three W bosons in an extended warped extra-dimensional model and are the first of their kind at the LHC.
Published: 2022

39. Search for single production of a vector-like T quark decaying to a top quark and a Z boson in the final state with jets and missing transverse momentum at √s = 13TeV

Author: SCOAP, Agencia Estatal de Investigación (España), Principado de Asturias, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, Agencia Estatal de Investigación (España), Principado de Asturias, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search is presented for single production of a vector-like T quark with charge 2/3 e, in the decay channel featuring a top quark and a Z boson, with the top quark decaying hadronically and the Z boson decaying to neutrinos. The search uses data collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1 recorded at the CERN LHC in 2016–2018. The search is sensitive to a T quark mass between 0.6 and 1.8 TeV with decay widths ranging from negligibly small up to 30% of the T quark mass. Reconstruction strategies for the top quark are based on the degree of Lorentz boosting of its final state. At 95% confidence level, the upper limit on the product of the cross section and branching fraction for a T quark of small decay width varies between 15 and 602 fb, depending on its mass. For a T quark with decay widths between 10 and 30% of its mass, this upper limit ranges between 16 and 836 fb. For most of the studied range, the results provide the best limits to date. This is the first search for single T quark production based on the full Run 2 data set of the LHC.
Published: 2022

40. Search for resonant production of strongly coupled dark matter in proton-proton collisions at 13 TeV

Author: SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Principado de Asturias, European Research Council, Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Principado de Asturias, European Research Council, Agencia Estatal de Investigación (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: The first collider search for dark matter arising from a strongly coupled hidden sector is presented and uses a data sample corresponding to 138 fb−1, collected with the CMS detector at the CERN LHC, at s√ = 13 TeV. The hidden sector is hypothesized to couple to the standard model (SM) via a heavy leptophobic Z′ mediator produced as a resonance in proton-proton collisions. The mediator decay results in two “semivisible” jets, containing both visible matter and invisible dark matter. The final state therefore includes moderate missing energy aligned with one of the jets, a signature ignored by most dark matter searches. No structure in the dijet transverse mass spectra compatible with the signal is observed. Assuming the Z′ boson has a universal coupling of 0.25 to the SM quarks, an inclusive search, relevant to any model that exhibits this kinematic behavior, excludes mediator masses of 1.5–4.0 TeV at 95% confidence level, depending on the other signal model parameters. To enhance the sensitivity of the search for this particular class of hidden sector models, a boosted decision tree (BDT) is trained using jet substructure variables to distinguish between semivisible jets and SM jets from background processes. When the BDT is employed to identify each jet in the dijet system as semivisible, the mediator mass exclusion increases to 5.1 TeV, for wider ranges of the other signal model parameters. These limits exclude a wide range of strongly coupled hidden sector models for the first time.
Published: 2022

41. Using Z boson events to study parton-medium interactions in Pb-Pb collisions

Author: SCOAP, CMS Collaboration, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, CMS Collaboration, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Ricci-Tam, F., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: The spectra measurements of charged hadrons produced in the shower of a parton originating in the same hard scattering with a leptonically decaying Z boson are reported in lead-lead nuclei (Pb-Pb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Both Pb-Pb and pp data sets are recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 1.7nb−1 and 320pb−1, respectively. Hadronic collision data with one reconstructed Z boson candidate with the transverse momentum pT>30 GeV/c are analyzed. The Z boson constrains the initial energy and direction of the associated parton. In heavy ion events, azimuthal angular distributions of charged hadrons with respect to the direction of a Z boson are sensitive to modifications of the in-medium parton shower and medium response. compared to reference data from pp interactions, the results for central Pb-Pb collisions indicate a modification of the angular correlations. The measurements of the fragmentation functions and pT spectra of charged particles in Z boson events, which are sensitive to medium modifications of the parton shower longitudinal structure, are also reported. Significant modifications in central Pb-Pb events compared to the pp reference data are also found for these observables.
Published: 2022

42. Measurement of the production cross section for Z + b jets in proton-proton collisions at √s = 13 TeV

Author: SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, European Commission, Agencia Estatal de Investigación (España), Principado de Asturias, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: The measurement of the cross section for the production of a Z boson, decaying to dielectrons or dimuons, in association with at least one bottom quark jet is performed with proton-proton collision data at √s=13 TeV. The data sample corresponds to an integrated luminosity of 137 fb−1, collected by the CMS experiment at the LHC during 2016–2018. The integrated cross sections for Z+≥1bjet and Z+≥2bjets are reported for the electron, muon, and combined channels. The fiducial cross sections in the combined channel are 6.52±0.04(stat)±0.40(syst)±0.14(theo)pb for Z+≥1bjet and 0.65±0.03(stat)±0.07(syst)±0.02(theo) pb for Z+≥2b jets. The differential cross section distributions are measured as functions of various kinematic observables that are useful for precision tests of perturbative quantum chromodynamics predictions. The ratios of integrated and differential cross sections for Z+≥2b jets and Z+≥1 b jet processes are also determined. The value of the integrated cross section ratio measured in the combined channel is 0.100±0.005(stat)±0.007(syst)±0.003(theo). All measurements are compared with predictions from various event generators.
Published: 2022

43. Search for long-lived particles produced in association with a Z boson in proton-proton collisions at √s = 13TeV

Author: SCOAP, European Commission, Principado de Asturias, Ministerio de Economía y Competitividad (España), European Research Council, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, European Commission, Principado de Asturias, Ministerio de Economía y Competitividad (España), European Research Council, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for long-lived particles (LLPs) produced in association with a Z boson is presented. The study is performed using data from proton-proton collisions with a center-of-mass energy of 13 TeV recorded by the CMS experiment during 2016–2018, corresponding to an integrated luminosity of 117 fb−1. The LLPs are assumed to decay to a pair of standard model quarks that are identified as displaced jets within the CMS tracker system. Triggers and selections based on Z boson decays to electron or muon pairs improve the sensitivity to light LLPs (down to 15 GeV). This search provides sensitivity to beyond the standard model scenarios which predict LLPs produced in association with a Z boson. In particular, the results are interpreted in the context of exotic decays of the Higgs boson to a pair of scalar LLPs (H → SS). The Higgs boson decay branching fraction is constrained to values less than 6% for proper decay lengths of 10–100 mm and for LLP masses between 40 and 55 GeV. In the case of low-mass (≈ 15 GeV) scalar particles that subsequently decay to a pair of b quarks, the search is sensitive to branching fractions B (H → SS) < 20% for proper decay lengths of 10–50 mm. The use of associated production with a Z boson increases the sensitivity to low-mass LLPs of this analysis with respect to gluon fusion searches. In the case of 15 GeV scalar LLPs, the improvement corresponds to a factor of 2 at a proper decay length of 30 mm.
Published: 2022

44. Measurement of the inclusive tt¯ production cross section in proton-proton collisions at √s = 5.02 TeV

Author: SCOAP, European Commission, European Research Council, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, European Commission, European Research Council, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: The top quark pair production cross section is measured in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data were collected in a special LHC low-energy and low-intensity run in 2017, and correspond to an integrated luminosity of 302 pb−1. The measurement is performed using events with one electron and one muon of opposite charge, and at least two jets. The measured cross section is 60.7 ± 5.0 (stat) ± 2.8 (syst) ± 1.1 (lumi) pb. A combination with the result in the single lepton + jets channel, based on data collected in 2015 at the same center-of-mass energy and corresponding to an integrated luminosity of 27.4 pb−1, is then performed. The resulting measured value is 63.0 ± 4.1 (stat) ± 3.0 (syst+lumi) pb, in agreement with the standard model prediction of 66.8+2.9−3.1 pb.
Published: 2022

45. Erratum to: Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at √s = 13 TeV

Author: SCOAP, CMS Collaboration, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., SCOAP, CMS Collaboration, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Published: 2022

46. Search for long-lived particles decaying into muon pairs in proton-proton collisions at √s = 13TeV collected with a dedicated high-rate data stream

Author: Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, European Research Council, European Commission, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, European Research Council, European Commission, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for long-lived particles decaying into muon pairs is performed using proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2017 and 2018, corresponding to an integrated luminosity of 101 fb−1. The data sets used in this search were collected with a dedicated dimuon trigger stream with low transverse momentum thresholds, recorded at high rate by retaining a reduced amount of information, in order to explore otherwise inaccessible phase space at low dimuon mass and nonzero displacement from the primary interaction vertex. No significant excess of events beyond the standard model expectation is found. Upper limits on branching fractions at 95% confidence level are set on a wide range of mass and lifetime hypotheses in beyond the standard model frameworks with the Higgs boson decaying into a pair of long-lived dark photons, or with a long-lived scalar resonance arising from a decay of a b hadron. The limits are the most stringent to date for substantial regions of the parameter space. These results can be also used to constrain models of displaced dimuons that are not explicitly considered in this paper.
Published: 2022

47. Erratum to: Measurement of the top quark mass with lepton+jets final states using pp collisions at √s=13TeV

Author: SCOAP, CMS Collaboration, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., SCOAP, CMS Collaboration, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Published: 2022

48. Search for a heavy resonance decaying into a top quark and a W boson in the lepton+jets final state at √s = 13TeV

Author: European Commission, European Research Council, Ministerio de Economía y Competitividad (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., European Commission, European Research Council, Ministerio de Economía y Competitividad (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for a heavy resonance decaying into a top quark and a W boson in proton-proton collisions at √s = 13 TeV is presented. The data analyzed were recorded with the CMS detector at the LHC and correspond to an integrated luminosity of 138 fb−1. The top quark is reconstructed as a single jet and the W boson, from its decay into an electron or muon and the corresponding neutrino. A top quark tagging technique based on jet clustering with a variable distance parameter and simultaneous jet grooming is used to identify jets from the collimated top quark decay. The results are interpreted in the context of two benchmark models, where the heavy resonance is either an excited bottom quark b∗ or a vector-like quark B. A statistical combination with an earlier search by the CMS Collaboration in the all-hadronic final state is performed to place upper cross section limits on these two models. The new analysis extends the lower range of resonance mass probed from 1.4 down to 0.7 TeV. For left-handed, right-handed, and vector-like couplings, b∗ masses up to 3.0, 3.0, and 3.2 TeV are excluded at 95% confidence level, respectively. The observed upper limits represent the most stringent constraints on the b∗ model to date.
Published: 2022

49. Probing charm quark dynamics via multiparticle correlations in Pb-Pb collisions at √sNN=5.02 TeV

Author: SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: Multiparticle azimuthal correlations of prompt D0 mesons are measured in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of √sNN=5.02 TeV . For the first time, a four-particle cumulant method is used to extract the second Fourier coefficient of the azimuthal distribution (v2) of D0 mesons as a function of event centrality and the D0 transverse momentum. The ratios of the four-particle v2 values to previously measured two-particle cumulant results provide direct experimental access to event-by-event fluctuations of charm quark azimuthal anisotropies. These ratios are also found to be comparable to those of inclusive charged particles in the event. However, hints of deviations are seen in the most central and peripheral collisions. To investigate the origin of flow fluctuations in the charm sector, these measurements are compared to a model implementing fluctuations of charm quark energy loss via collisional or radiative processes in the quark-gluon plasma. These models cannot quantitatively describe the data over the full transverse momentum and centrality ranges, although the calculations with collisional energy loss provide a better description of the data.
Published: 2022

50. Search for flavor-changing neutral current interactions of the top quark and the Higgs boson decaying to a bottom quark-antiquark pair at √s = 13 TeV

Author: European Commission, European Research Council, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, Vizán, J., European Commission, European Research Council, Principado de Asturias, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), SCOAP, CMS Collaboration, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Duarte Campderros, J., Fernández-García, Marcos, Fernandez Madrazo, C., Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Matorras-Cuevas, Pablo, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vila, Iván, and Vizán, J.
Abstract: A search for flavor-changing neutral current interactions of the top quark (t) and the Higgs boson (H) is presented. The search is based on a data sample corresponding to an integrated luminosity of 137 fb−1 recorded by the CMS experiment at the LHC in proton-proton collisions at √s = 13 TeV. Events containing exactly one lepton (muon or electron) and at least three jets, among which at least two are identified as originating from the hadronization of a bottom quark, are analyzed. A set of deep neural networks is used for kinematic event reconstruction, while boosted decision trees distinguish the signal from the background events. No significant excess over the background predictions is observed, and upper limits on the signal production cross sections are extracted. These limits are interpreted in terms of top quark decay branching fractions (B ) to the Higgs boson and an up (u) or a charm quark (c). Assuming one nonvanishing extra coupling at a time, the observed (expected) upper limits at 95% confidence level are B(t → Hu) < 0.079 (0.11)% and B(t → Hc) < 0.094 (0.086)%.
Published: 2022

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