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Study of charm mixing and CP violation with D0→ K±π∓π±π∓ decays

Journal of High Energy Physics 2025:12 (2025) 153

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, AA Adefisoye, B Adeva, M Adinolfi, P Adlarson, C Agapopoulou, CA Aidala, Z Ajaltouni, S Akar, K Akiba, P Albicocco, J Albrecht, R Aleksiejunas, F Alessio, P Alvarez Cartelle, R Amalric, S Amato, JL Amey, Y Amhis, L An, L Anderlini, M Andersson, P Andreola, M Andreotti, S Andres Estrada, A Anelli, D Ao, C Arata, F Archilli, Z Areg, M Argenton, S Arguedas Cuendis, L Arnone, A Artamonov, M Artuso, E Aslanides, R Ataíde Da Silva, M Atzeni, B Audurier, JA Authier, D Bacher, I Bachiller Perea, S Bachmann, M Bachmayer, JJ Back, P Baladron Rodriguez, V Balagura, A Balboni, W Baldini, Z Baldwin, L Balzani, H Bao, J Baptista de Souza Leite, C Barbero Pretel, M Barbetti, IR Barbosa, RJ Barlow, M Barnyakov, S Barsuk, W Barter, J Bartz, S Bashir, B Batsukh, PB Battista, A Bay, A Beck, M Becker, F Bedeschi, IB Bediaga, NA Behling, S Belin, A Bellavista, K Belous, I Belov, I Belyaev, G Benane, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, S Bernet Andres, A Bertolin, C Betancourt, F Betti, J Bex, Ia Bezshyiko, O Bezshyyko, J Bhom, MS Bieker, NV Biesuz, P Billoir, A Biolchini, M Birch, FCR Bishop, A Bitadze, A Bizzeti, T Blake, F Blanc, JE Blank, S Blusk, V Bocharnikov, JA Boelhauve, O Boente Garcia, T Boettcher, A Bohare, A Boldyrev, CS Bolognani, R Bolzonella, RB Bonacci, N Bondar, A Bordelius, F Borgato, S Borghi, M Borsato, JT Borsuk, E Bottalico, SA Bouchiba, M Bovill, TJV Bowcock, A Boyer, C Bozzi, JD Brandenburg, A Brea Rodriguez, N Breer, J Brodzicka, A Brossa Gonzalo, J Brown, D Brundu, E Buchanan, M Burgos Marcos, AT Burke, C Burr, C Buti, JS Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, Y Cai, A Caillet, R Calabrese, S Calderon Ramirez, L Calefice, S Cali, M Calvi, M Calvo Gomez, P Camargo Magalhaes, JI Cambon Bouzas, P Campana, DH Campora Perez, AF Campoverde Quezada, S Capelli, M Caporale, L Capriotti, R Caravaca-Mora, A Carbone, L Carcedo Salgado, R Cardinale, A Cardini, P Carniti, L Carus, A Casais Vidal, R Caspary, G Casse, M Cattaneo, G Cavallero, V Cavallini, S Celani, I Celestino, S Cesare, AJ Chadwick, I Chahrour, H Chang, M Charles, Ph Charpentier, E Chatzianagnostou, R Cheaib, M Chefdeville, C Chen, J Chen, S Chen, Z Chen, M Cherif, A Chernov, S Chernyshenko, X Chiotopoulos, V Chobanova, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, X Cid Vidal, G Ciezarek, P Cifra, PEL Clarke, M Clemencic, HV Cliff, J Closier, C Cocha Toapaxi, V Coco, J Cogan, E Cogneras, L Cojocariu, S Collaviti, P Collins, T Colombo, M Colonna, A Comerma-Montells, L Congedo, J Connaughton, A Contu, N Cooke, G Cordova, C Coronel, I Corredoira, A Correia, G Corti, J Cottee Meldrum, B Couturier, DC Craik, M Cruz Torres, E Curras Rivera, R Currie, CL Da Silva, S Dadabaev, L Dai, X Dai, E Dall’Occo, J Dalseno, C D’Ambrosio, J Daniel, P d’Argent, G Darze, A Davidson, JE Davies, O De Aguiar Francisco, C De Angelis, F De Benedetti, J de Boer, K De Bruyn, S De Capua, M De Cian, U De Freitas Carneiro Da Graca, E De Lucia, JM De Miranda, L De Paula, M De Serio, P De Simone, F De Vellis, JA de Vries, F Debernardis, D Decamp, S Dekkers, L Del Buono, B Delaney, H-P Dembinski, J Deng, V Denysenko, O Deschamps, F Dettori, B Dey, P Di Nezza, I Diachkov, S Didenko, S Ding, Y Ding, L Dittmann, V Dobishuk, AD Docheva, A Doheny, C Dong, AM Donohoe, F Dordei, AC dos Reis, AD Dowling, L Dreyfus, W Duan, P Duda, L Dufour, V Duk, P Durante, MM Duras, JM Durham, OD Durmus, A Dziurda, A Dzyuba, S Easo, E Eckstein, U Egede, A Egorychev, V Egorychev, S Eisenhardt, E Ejopu, L Eklund, M Elashri, J Ellbracht, S Ely, A Ene, J Eschle, S Esen, T Evans, F Fabiano, S Faghih, LN Falcao, B Fang, R Fantechi, L Fantini, M Faria, K Farmer, D Fazzini, L Felkowski, M Feng, M Feo, A Fernandez Casani, M Fernandez Gomez, AD Fernez, F Ferrari, F Ferreira Rodrigues, M Ferrillo, M Ferro-Luzzi, S Filippov, RA Fini, M Fiorini, M Firlej, KL Fischer, DS Fitzgerald, C Fitzpatrick, T Fiutowski, F Fleuret, A Fomin, M Fontana, LA Foreman, R Forty, D Foulds-Holt, V Franco Lima, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, DA Friday, J Fu, Q Führing, T Fulghesu, G Galati, MD Galati, A Gallas Torreira, D Galli, S Gambetta, M Gandelman, P Gandini, B Ganie, H Gao, R Gao, TQ Gao, Y Gao, Y Gao, Y Gao, LM Garcia Martin, P Garcia Moreno, J García Pardiñas, P Gardner, KG Garg, L Garrido, C Gaspar, A Gavrikov, LL Gerken, E Gersabeck, M Gersabeck, T Gershon, S Ghizzo, Z Ghorbanimoghaddam, L Giambastiani, FI Giasemis, V Gibson, HK Giemza, AL Gilman, M Giovannetti, A Gioventù, L Girardey, MA Giza, FC Glaser, VV Gligorov, C Göbel, L Golinka-Bezshyyko, E Golobardes, D Golubkov, A Golutvin, S Gomez Fernandez, W Gomulka, I Gonçales Vaz, F Goncalves Abrantes, M Goncerz, G Gong, JA Gooding, IV Gorelov, C Gotti, E Govorkova, JP Grabowski, LA Granado Cardoso, E Graugés, E Graverini, L Grazette, G Graziani, AT Grecu, LM Greeven, NA Grieser, L Grillo, S Gromov, C Gu, M Guarise, L Guerry, V Guliaeva, PA Günther, A-K Guseinov, E Gushchin, Y Guz, T Gys, K Habermann, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, S Haken, G Hallett, PM Hamilton, J Hammerich, Q Han, X Han, S Hansmann-Menzemer, L Hao, N Harnew, TH Harris, M Hartmann, S Hashmi, J He, A Hedes, F Hemmer, C Henderson, R Henderson, RDL Henderson, AM Hennequin, K Hennessy, L Henry, J Herd, P Herrero Gascon, J Heuel, A Hicheur, G Hijano Mendizabal, J Horswill, R Hou, Y Hou, DC Houston, N Howarth, J Hu, W Hu, X Hu, W Hulsbergen, RJ Hunter, M Hushchyn, D Hutchcroft, M Idzik, D Ilin, P Ilten, A Iniukhin, A Iohner, A Ishteev, K Ivshin, H Jage, SJ Jaimes Elles, S Jakobsen, E Jans, BK Jashal, A Jawahery, C Jayaweera, V Jevtic, Z Jia, E Jiang, X Jiang, Y Jiang, YJ Jiang, E Jimenez Moya, N Jindal, M John, A John Rubesh Rajan, D Johnson, CR Jones, S Joshi, B Jost, J Juan Castella, N Jurik, I Juszczak, D Kaminaris, S Kandybei, M Kane, Y Kang, C Kar, M Karacson, A Kauniskangas, JW Kautz, MK Kazanecki, F Keizer, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, G Khreich, T Kirn, VS Kirsebom, O Kitouni, S Klaver, N Kleijne, DK Klekots, K Klimaszewski, MR Kmiec, T Knospe, S Koliiev, L Kolk, A Konoplyannikov, P Kopciewicz, P Koppenburg, A Korchin, M Korolev, I Kostiuk, O Kot, S Kotriakhova, E Kowalczyk, A Kozachuk, P Kravchenko, L Kravchuk, O Kravcov, M Kreps, P Krokovny, W Krupa, W Krzemien, O Kshyvanskyi, S Kubis, M Kucharczyk, V Kudryavtsev, E Kulikova, A Kupsc, V Kushnir, B Kutsenko, J Kvapil, I Kyryllin, D Lacarrere, P Laguarta Gonzalez, A Lai, A Lampis, D Lancierini, C Landesa Gomez, JJ Lane, R Lane, G Lanfranchi, C Langenbruch, J Langer, O Lantwin, T Latham, F Lazzari, C Lazzeroni, R Le Gac, H Lee, R Lefèvre, A Leflat, S Legotin, M Lehuraux, E Lemos Cid, O Leroy, T Lesiak, ED Lesser, B Leverington, A Li, C Li, C Li, H Li, J Li, K Li, L Li, M Li, P Li, P-R Li, Q Li, T Li, T Li, Y Li, Y Li, Y Li, Z Lian, Q Liang, X Liang, Z Liang, S Libralon, AL Lightbody, C Lin, T Lin, R Lindner, H Linton, R Litvinov, D Liu, FL Liu, G Liu, K Liu, S Liu, W Liu, Y Liu, Y Liu, YL Liu, G Loachamin Ordonez, A Lobo Salvia, A Loi, T Long, FCL Lopes, JH Lopes, A Lopez Huertas, C Lopez Iribarnegaray, S López Soliño, Q Lu, C Lucarelli, D Lucchesi, M Lucio Martinez, Y Luo, A Lupato, E Luppi, K Lynch, X-R Lyu, GM Ma, H Ma, S Maccolini, F Machefert, F Maciuc, B Mack, I Mackay, LM Mackey, LR Madhan Mohan, MJ Madurai, D Magdalinski, D Maisuzenko, JJ Malczewski, S Malde, L Malentacca, A Malinin, T Maltsev, G Manca, G Mancinelli, C Mancuso, R Manera Escalero, FM Manganella, D Manuzzi, D Marangotto, JF Marchand, R Marchevski, U Marconi, E Mariani, S Mariani, C Marin Benito, J Marks, AM Marshall, L Martel, G Martelli, G Martellotti, L Martinazzoli, M Martinelli, D Martinez Gomez, D Martinez Santos, F Martinez Vidal, A Martorell i Granollers, A Massafferri, R Matev, A Mathad, V Matiunin, C Matteuzzi, KR Mattioli, A Mauri, E Maurice, J Mauricio, P Mayencourt, J Mazorra de Cos, M Mazurek, M McCann, TH McGrath, NT McHugh, A McNab, R McNulty, B Meadows, G Meier, D Melnychuk, D Mendoza Granada, P Menendez Valdes Perez, FM Meng, M Merk, A Merli, L Meyer Garcia, D Miao, H Miao, M Mikhasenko, DA Milanes, A Minotti, E Minucci, T Miralles, B Mitreska, DS Mitzel, A Modak, L Moeser, RD Moise, EF Molina Cardenas, T Mombächer, M Monk, S Monteil, A Morcillo Gomez, G Morello, MJ Morello, MP Morgenthaler, A Moro, J Moron, W Morren, AB Morris, AG Morris, R Mountain, H Mu, ZM Mu, E Muhammad, F Muheim, M Mulder, K Müller, F Muñoz-Rojas, R Murta, V Mytrochenko, P Naik, T Nakada, R Nandakumar, T Nanut, I Nasteva, M Needham, E Nekrasova, N Neri, S Neubert, N Neufeld, P Neustroev, J Nicolini, D Nicotra, EM Niel, N Nikitin, L Nisi, Q Niu, P Nogarolli, P Nogga, C Normand, J Novoa Fernandez, G Nowak, C Nunez, HN Nur, A Oblakowska-Mucha, V Obraztsov, T Oeser, A Okhotnikov, O Okhrimenko, R Oldeman, F Oliva, E Olivart Pino, M Olocco, CJG Onderwater, RH O’Neil, JS Ordonez Soto, D Osthues, JM Otalora Goicochea, P Owen, A Oyanguren, O Ozcelik, F Paciolla, A Padee, KO Padeken, B Pagare, T Pajero, A Palano, M Palutan, C Pan, X Pan, S Panebianco, G Panshin, L Paolucci, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, C Parkes, D Parmar, B Passalacqua, G Passaleva, D Passaro, A Pastore, M Patel, J Patoc, C Patrignani, A Paul, CJ Pawley, A Pellegrino, J Peng, X Peng, M Pepe Altarelli, S Perazzini, D Pereima, H Pereira Da Costa, M Pereira Martinez, A Pereiro Castro, C Perez, P Perret, A Perrevoort, A Perro, MJ Peters, K Petridis, A Petrolini, S Pezzulo, JP Pfaller, H Pham, L Pica, M Piccini, L Piccolo, B Pietrzyk, G Pietrzyk, RN Pilato, D Pinci, F Pisani, M Pizzichemi, VM Placinta, M Plo Casasus, T Poeschl, F Polci, M Poli Lener, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, S Ponce, D Popov, S Poslavskii, K Prasanth, C Prouve, D Provenzano, V Pugatch, G Punzi, JR Pybus, S Qasim, QQ Qian, W Qian, N Qin, S Qu, R Quagliani, RI Rabadan Trejo, R Racz, JH Rademacker, M Rama, M Ramírez García, V Ramos De Oliveira, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Rebollo De Miguel, F Redi, J Reich, F Reiss, Z Ren, PK Resmi, M Ribalda Galvez, R Ribatti, G Ricart, D Riccardi, S Ricciardi, K Richardson, M Richardson-Slipper, K Rinnert, P Robbe, G Robertson, E Rodrigues, A Rodriguez Alvarez, E Rodriguez Fernandez, JA Rodriguez Lopez, E Rodriguez Rodriguez, J Roensch, A Rogachev, A Rogovskiy, DL Rolf, P Roloff, V Romanovskiy, A Romero Vidal, G Romolini, F Ronchetti, T Rong, M Rotondo, SR Roy, MS Rudolph, M Ruiz Diaz, RA Ruiz Fernandez, J Ruiz Vidal, JJ Saavedra-Arias, JJ Saborido Silva, SER Sacha Emile R., N Sagidova, D Sahoo, N Sahoo, B Saitta, M Salomoni, I Sanderswood, R Santacesaria, C Santamarina Rios, M Santimaria, L Santoro, E Santovetti, A Saputi, D Saranin, A Sarnatskiy, G Sarpis, M Sarpis, C Satriano, A Satta, M Saur, D Savrina, H Sazak, F Sborzacchi, A Scarabotto, S Schael, S Scherl, M Schiller, H Schindler, M Schmelling, B Schmidt, N Schmidt, S Schmitt, H Schmitz, O Schneider, A Schopper, N Schulte, MH Schune, G Schwering, B Sciascia, A Sciuccati, G Scriven, I Segal, S Sellam, A Semennikov, T Senger, M Senghi Soares, A Sergi, N Serra, L Sestini, A Seuthe, B Sevilla Sanjuan, Y Shang, DM Shangase, M Shapkin, RS Sharma, I Shchemerov, L Shchutska, T Shears, L Shekhtman, Z Shen, S Sheng, V Shevchenko, B Shi, Q Shi, WS Shi, Y Shimizu, E Shmanin, R Shorkin, JD Shupperd, R Silva Coutinho, G Simi, S Simone, M Singha, N Skidmore, T Skwarnicki, MW Slater, JC Smallwood, E Smith, K Smith, M Smith, L Soares Lavra, MD Sokoloff, FJP Soler, A Solomin, A Solovev, K Solovieva, NS Sommerfeld, R Song, Y Song, Y Song, YS Song, FL Souza De Almeida, B Souza De Paula, KM Sowa, E Spadaro Norella, E Spedicato, JG Speer, P Spradlin, V Sriskaran, F Stagni, M Stahl, S Stahl, S Stanislaus, M Stefaniak, EN Stein, O Steinkamp, H Stevens, D Strekalina, Y Su, F Suljik, J Sun, J Sun, L Sun, D Sundfeld, W Sutcliffe, V Svintozelskyi, K Swientek, F Swystun, A Szabelski, T Szumlak, Y Tan, Y Tang, YT Tang, MD Tat, JA Teijeiro Jimenez, A Terentev, F Terzuoli, F Teubert, E Thomas, DJD Thompson, AR Thomson-Strong, H Tilquin, V Tisserand, S T’Jampens, M Tobin, TT Todorov, L Tomassetti, G Tonani, X Tong, T Tork, D Torres Machado, L Toscano, DY Tou, C Trippl, G Tuci, N Tuning, LH Uecker, A Ukleja, DJ Unverzagt, A Upadhyay, B Urbach, A Usachov, A Ustyuzhanin, U Uwer, V Vagnoni, V Valcarce Cadenas, G Valenti, N Valls Canudas, J van Eldik, H Van Hecke, E van Herwijnen, CB Van Hulse, R Van Laak, M van Veghel, G Vasquez, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, J Velilla Serna, JJ Velthuis, M Veltri, A Venkateswaran, M Verdoglia, M Vesterinen, W Vetens, D Vico Benet, P Vidrier Villalba, M Vieites Diaz, X Vilasis-Cardona, E Vilella Figueras, A Villa, P Vincent, B Vivacqua, FC Volle, D vom Bruch, N Voropaev, K Vos, C Vrahas, J Wagner, J Walsh, EJ Walton, G Wan, A Wang, B Wang, C Wang, G Wang, H Wang, J Wang, J Wang, J Wang, J Wang, M Wang, NW Wang, R Wang, X Wang, X Wang, XW Wang, Y Wang, Y Wang, YH Wang, Z Wang, Z Wang, Z Wang, JA Ward, M Waterlaat, NK Watson, D Websdale, Y Wei, Z Weida, J Wendel, BDC Westhenry, C White, M Whitehead, E Whiter, AR Wiederhold, D Wiedner, MA Wiegertjes, C Wild, G Wilkinson, MK Wilkinson, M Williams, MJ Williams, MRJ Williams, R Williams, S Williams, Z Williams, FF Wilson, M Winn, W Wislicki, M Witek, L Witola, T Wolf, E Wood, G Wormser, SA Wotton, H Wu, J Wu, X Wu, Y Wu, Z Wu, K Wyllie, S Xian, Z Xiang, Y Xie, TX Xing, A Xu, L Xu, L Xu, M Xu, Z Xu, Z Xu, Z Xu, K Yang, X Yang, Y Yang, Z Yang, V Yeroshenko, H Yeung, H Yin, X Yin, CY Yu, J Yu, X Yuan, Y Yuan, E Zaffaroni, JA Zamora Saa, M Zavertyaev, M Zdybal, F Zenesini, C Zeng, M Zeng, C Zhang, D Zhang, J Zhang, L Zhang, R Zhang, S Zhang, SL Zhang, Y Zhang, YZ Zhang, Z Zhang, Y Zhao, A Zhelezov, SZ Zheng, XZ Zheng, Y Zheng, T Zhou, X Zhou, Y Zhou, V Zhovkovska, LZ Zhu, X Zhu, X Zhu, Y Zhu, V Zhukov, J Zhuo, Q Zou, D Zuliani, G Zunica

Abstract:

A study of charm mixing and CP violation in D0 → K±π∓π±π∓ decays is performed using data collected by the LHCb experiment in proton-proton collisions from 2015 to 2018, corresponding to an integrated luminosity of 6 fb−1. The ratio of promptly produced D0 → K+π−π+π− to D0 → K−π+π−π+ decay rates is measured as a function of D0 decay time, both inclusive over phase space and in bins of phase space. Taking external inputs for the D0−D¯0$$ {D}^0-{\overline{D}}^0 $$ mixing parameters x and y allows constraints to be obtained on the hadronic parameters of the charm decay. When combined with previous measurements from charm-threshold experiments and at LHCb, improved knowledge is obtained for these parameters, which is valuable for studies of the angle γ of the Unitarity Triangle. An alternative analysis is also performed, in which external inputs are taken for the hadronic parameters, and the mixing parameters are determined, including ∆x and ∆y, which are nonzero in the presence of CP violation. It is found that x=0.85−0.24+0.15%$$ x=\left(0.{85}_{-0.24}^{+0.15}\right)\% $$, y=0.21−0.27+0.29%$$ y=\left(0.{21}_{-0.27}^{+0.29}\right)\% $$, ∆x = (−0.02 ± 0.04) % and Δy=0.02−0.03+0.04%$$ \Delta y=\left(0.0{2}_{-0.03}^{+0.04}\right)\% $$. These results are consistent with previous measurements and the hypothesis of CP conservation.

Simulation, optimisation, and validation of CoMind R1: A multichannel interferometric system for monitoring cerebral blood flow at late times-of-flight

Progress in Biomedical Optics and Imaging Proceedings of SPIE 13934 (2025)

Authors:

A Behera, V Parfentyeva, DW Hill, S Avtzi, O Etard, A Tran-Van-Minh, Y Ibrahim, A Mehmed, A Isufaj, J Goodrich, N Singh, S Darabi, P Villar Sanjurjo, T Ali, Y Kim, T Tambe, C Lin, S Sturniolo, A Ruesch, Y Zhang, A Salehi Lashkajani, S Malde, J Andersen, C Maine, G McCabe, M Thackrah, B Crutchley, D Borycki, T Dragojević, C Lindner, RJ Cooper

Abstract:

We present a Monte Carlo-based simulation stack that provides time-of-flight (ToF)-resolved blood flow index (BFi) and has been validated against continuous-wave (CW) and time-resolved BFi measurements in both tissue-mimicking phantoms and in-vivo. Using this simulation, we evaluated the influence of key parameters including source-detector separation, ToF selection, and minimum resolvable lag on brain sensitivity by comparing simulated pulsatile blood flow signals from scalp and brain layers. We used these results to optimise the design of CoMind Research One (R1), a 16-channel interferometric time-of-flight-resolved optical neuromonitoring system that operates in real time and enables high-fidelity measurements of field autocorrelation at times-of-flight exceeding 1 ns. We validated this system and demonstrated its depth sensitivity using homogeneous and bi-layer dynamic tissue-mimicking phantoms. The advancements in optical throughput, depth selectivity, and robustness demonstrated by CoMind R1 pave the way for clinical translation and broader adoption of non-invasive optical measurements of cerebral blood flow.

The Timepix4 beam telescope

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Elsevier 1084 (2025) 171234

Authors:

Kazuyoshi Carvalho Akiba, Jerome A Alozy, David Bacher, R Ballabriga Sune, F de Benedetti, M van Beuzekom, V van Beveren, T Bischoff, H Boterenbrood, W Byczynski, M Campbell, E Chatzianagnostou, V Coco, P Collins, E Dall’Occo, R Dumps, T Evans, A Fernández Prieto, M Fransen, A Gallas Torreira, Rui Gao, R Geertsema, Fernanda Gonçalves Abrantes, V Gromov, Mm Halvorsen, B van der Heijden, K Heijhoff, M John, D Johnson, U Krämer, E Lemos Cid, X Llopart Cudie, Mj Madurai, D Oppenhuis, T Pajero, E Rodríguez Rodríguez, D Rolf, A Sarnatskiy, H Schindler, P Vázquez Regueiro, A Vitkovskiy, M Williams, G Wang

Abstract:

The spatial and temporal performance of a telescope system comprising planar silicon sensors bump-bonded to Timepix4-v2 ASICs are assessed at the CERN SPS using a 180 GeV/c mixed hadron beam. The pointing resolution at the centre of the telescope is 2.3 ± 0.1 μm and 2.4 ± 0.1 μm in x and y directions, respectively. The temporal resolution for the combined timestamps on a track using only the information from the Timepix4 planes is found to be 92 ± 5 ps. The telescope is extensively described including its data acquisition system and dedicated software as well as the corrections applied to the raw measurements.

Search for CP violation in $e^{+}e^{-} \to ψ(3770) \to D^{0}\bar{D}^{0}$ via $D -> K^{0}_{S} π^{0}$

(2025)

Authors:

BESIII Collaboration, M Ablikim, MN Achasov, P Adlarson, XC Ai, R Aliberti, A Amoroso, Q An, Y Bai, O Bakina, Y Ban, H-R Bao, V Batozskaya, K Begzsuren, N Berger, M Berlowski, MB Bertani, D Bettoni, F Bianchi, E Bianco, A Bortone, I Boyko, RA Briere, A Brueggemann, H Cai, MH Cai, X Cai, A Calcaterra, GF Cao, N Cao, SA Cetin, XY Chai, JF Chang, TT Chang, GR Che, YZ Che, CH Chen, Chao Chen, G Chen, HS Chen, HY Chen, ML Chen, SJ Chen, SL Chen, SM Chen, T Chen, XR Chen, XT Chen, XY Chen, YB Chen, YQ Chen, Z Chen, ZK Chen, J Cheng, LN Cheng, SK Choi, X Chu, G Cibinetto, F Cossio, J Cottee-Meldrum, HL Dai, JP Dai, A Dbeyssi, RE de Boer, D Dedovich, CQ Deng, ZY Deng, A Denig, I Denisenko, M Destefanis, F De Mori, B Ding, XX Ding, Y Ding, Y Ding, YX Ding, J Dong, LY Dong, MY Dong, X Dong, MC Du, SX Du, SX Du, XL Du, YY Duan, ZH Duan, P Egorov, GF Fan, JJ Fan, YH Fan, J Fang, J Fang, SS Fang, WX Fang, YQ Fang, R Farinelli, L Fava, F Feldbauer, G Felici, CQ Feng, JH Feng, L Feng, QX Feng, YT Feng, M Fritsch, CD Fu, JL Fu, YW Fu, H Gao, XB Gao, Y Gao, YN Gao, YN Gao, YY Gao, Z Gao, S Garbolino, I Garzia, L Ge, PT Ge, ZW Ge, C Geng, EM Gersabeck, A Gilman, K Goetzen, J Gollub, JD Gong, L Gong, WX Gong, W Gradl, S Gramigna, M Greco, MH Gu, YT Gu, CY Guan, AQ Guo, JN Guo, LB Guo, MJ Guo, RP Guo, X Guo, YP Guo, A Guskov, J Gutierrez, KL Han, TT Han, F Hanisch, KD Hao, XQ Hao, FA Harris, KK He, KL He, FH Heinsius, CH Heinz, YK Heng, C Herold, PC Hong, GY Hou, XT Hou, YR Hou, ZL Hou, HM Hu, JF Hu, QP Hu, SL Hu, T Hu, Y Hu, ZM Hu, GS Huang, KX Huang, LQ Huang, P Huang, XT Huang, YP Huang, YS Huang, T Hussain, N Hüsken, N in der Wiesche, J Jackson, Q Ji, QP Ji, W Ji, XB Ji, XL Ji, XQ Jia, ZK Jia, D Jiang, HB Jiang, PC Jiang, SJ Jiang, XS Jiang, Y Jiang, JB Jiao, JK Jiao, Z Jiao, S Jin, Y Jin, MQ Jing, XM Jing, T Johansson, S Kabana, XL Kang, XS Kang, BC Ke, V Khachatryan, A Khoukaz, OB Kolcu, B Kopf, L Kröger, L Krümmel, M Kuessner, X Kui, N Kumar, A Kupsc, W Kühn, Q Lan, WN Lan, 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Observation of Orbitally Excited Bc+ States

Physical Review Letters American Physical Society (APS) 135:23 (2025) 231902

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, AA Adefisoye, B Adeva, M Adinolfi, P Adlarson, C Agapopoulou, CA Aidala, Z Ajaltouni, S Akar, K Akiba, P Albicocco, J Albrecht, F Alessio, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, JL Amey, Y Amhis, L An, L Anderlini, M Andersson, P Andreola, M Andreotti, S Andres Estrada, A Anelli, D Ao, F Archilli, Z Areg, M Argenton, S Arguedas Cuendis, A Artamonov, M Artuso, E Aslanides, R Ataíde Da Silva, M Atzeni, B Audurier, JA Authier, D Bacher, I Bachiller Perea, S Bachmann, M Bachmayer, JJ Back, P Baladron Rodriguez, V Balagura, A Balboni, W Baldini, L Balzani, H Bao, J Baptista de Souza Leite, C Barbero Pretel, M Barbetti, IR Barbosa, RJ Barlow, M Barnyakov, S Barsuk, W Barter, J Bartz, S Bashir, B Batsukh, PB Battista, A Bay, A Beck, M Becker, F Bedeschi, IB Bediaga, NA Behling, S Belin, K Belous, I Belov, I Belyaev, G Benane, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, S Bernet Andres, A Bertolin, C Betancourt, F Betti, J Bex, Ia Bezshyiko, O Bezshyyko, J Bhom, MS Bieker, NV Biesuz, P Billoir, A Biolchini, M Birch, FCR Bishop, A Bitadze, A Bizzeti, T Blake, F Blanc, JE Blank, S Blusk, V Bocharnikov, JA Boelhauve, O Boente Garcia, T Boettcher, A Bohare, A Boldyrev, CS Bolognani, R Bolzonella, RB Bonacci, N Bondar, A Bordelius, F Borgato, S Borghi, M Borsato, JT Borsuk, E Bottalico, SA Bouchiba, M Bovill, TJV Bowcock, A Boyer, C Bozzi, JD Brandenburg, A Brea Rodriguez, N Breer, J Brodzicka, A Brossa Gonzalo, J Brown, D Brundu, E Buchanan, L Buonincontri, M Burgos Marcos, AT Burke, C Burr, JS Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, Y Cai, A Caillet, R Calabrese, S Calderon Ramirez, L Calefice, S Cali, M Calvi, M Calvo Gomez, P Camargo Magalhaes, JI Cambon Bouzas, P Campana, DH Campora Perez, AF Campoverde Quezada, S Capelli, L Capriotti, R Caravaca-Mora, A Carbone, L Carcedo Salgado, R Cardinale, A Cardini, P Carniti, L Carus, A Casais Vidal, R Caspary, G Casse, M Cattaneo, G Cavallero, V Cavallini, S Celani, S Cesare, AJ Chadwick, I Chahrour, H Chang, M Charles, Ph Charpentier, E Chatzianagnostou, R Cheaib, M Chefdeville, C Chen, J Chen, S Chen, Z Chen, M Cherif, A Chernov, S Chernyshenko, X Chiotopoulos, V Chobanova, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, X Cid Vidal, G Ciezarek, P Cifra, PEL Clarke, M Clemencic, HV Cliff, J Closier, C Cocha Toapaxi, V Coco, J Cogan, E Cogneras, L Cojocariu, S Collaviti, P Collins, T Colombo, M Colonna, A Comerma-Montells, L Congedo, J Connaughton, A Contu, N Cooke, C Coronel, I Corredoira, A Correia, G Corti, J Cottee Meldrum, B Couturier, DC Craik, M Cruz Torres, E Curras Rivera, R Currie, CL Da Silva, S Dadabaev, L Dai, X Dai, E Dall’Occo, J Dalseno, C D’Ambrosio, J Daniel, P d’Argent, G Darze, A Davidson, JE Davies, O De Aguiar Francisco, C De Angelis, F De Benedetti, J de Boer, K De Bruyn, S De Capua, M De Cian, U De Freitas Carneiro Da Graca, E De Lucia, JM De Miranda, L De Paula, M De Serio, P De Simone, F De Vellis, JA de Vries, F Debernardis, D Decamp, S Dekkers, L Del Buono, B Delaney, H-P Dembinski, J Deng, V Denysenko, O Deschamps, F Dettori, B Dey, P Di Nezza, I Diachkov, S Didenko, S Ding, Y Ding, L Dittmann, V Dobishuk, AD Docheva, A Doheny, C Dong, AM Donohoe, F Dordei, AC dos Reis, AD Dowling, L Dreyfus, W Duan, P Duda, MW Dudek, L Dufour, V Duk, P Durante, MM Duras, JM Durham, OD Durmus, A Dziurda, A Dzyuba, S Easo, E Eckstein, U Egede, A Egorychev, V Egorychev, S Eisenhardt, E Ejopu, L Eklund, M Elashri, J Ellbracht, S Ely, A Ene, J Eschle, S Esen, T Evans, F Fabiano, S Faghih, LN Falcao, B Fang, R Fantechi, L Fantini, M Faria, K Farmer, D Fazzini, L Felkowski, M Feng, M Feo, A Fernandez Casani, M Fernandez Gomez, AD Fernez, F Ferrari, F Ferreira Rodrigues, M Ferrillo, M Ferro-Luzzi, S Filippov, RA Fini, M Fiorini, M Firlej, KL Fischer, DS Fitzgerald, C Fitzpatrick, T Fiutowski, F Fleuret, A Fomin, M Fontana, LA Foreman, R Forty, D Foulds-Holt, V Franco Lima, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, DA Friday, J Fu, Q Führing, T Fulghesu, G Galati, MD Galati, A Gallas Torreira, D Galli, S Gambetta, M Gandelman, P Gandini, B Ganie, H Gao, R Gao, TQ Gao, Y Gao, Y Gao, Y Gao, LM Garcia Martin, P Garcia Moreno, J García Pardiñas, P Gardner, KG Garg, L Garrido, C Gaspar, A Gavrikov, LL Gerken, E Gersabeck, M Gersabeck, T Gershon, S Ghizzo, Z Ghorbanimoghaddam, L Giambastiani, FI Giasemis, V Gibson, HK Giemza, AL Gilman, M Giovannetti, A Gioventù, L Girardey, MA Giza, FC Glaser, VV Gligorov, C Göbel, L Golinka-Bezshyyko, E Golobardes, D Golubkov, A Golutvin, S Gomez Fernandez, W Gomulka, I Gonçales Vaz, F Goncalves Abrantes, M Goncerz, G Gong, JA Gooding, IV Gorelov, C Gotti, E Govorkova, JP Grabowski, LA Granado Cardoso, E Graugés, E Graverini, L Grazette, G Graziani, AT Grecu, LM Greeven, NA Grieser, L Grillo, S Gromov, C Gu, M Guarise, L Guerry, V Guliaeva, PA Günther, A-K Guseinov, E Gushchin, Y Guz, T Gys, K Habermann, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, G Hallett, PM Hamilton, J Hammerich, Q Han, X Han, S Hansmann-Menzemer, L Hao, N Harnew, TH Harris, M Hartmann, S Hashmi, J He, F Hemmer, C Henderson, R Henderson, RDL Henderson, AM Hennequin, K Hennessy, L Henry, J Herd, P Herrero Gascon, J Heuel, A Hicheur, G Hijano Mendizabal, J Horswill, R Hou, Y Hou, DC Houston, N Howarth, J Hu, W Hu, X Hu, W Hulsbergen, RJ Hunter, M Hushchyn, D Hutchcroft, M Idzik, D Ilin, P Ilten, A Iniukhin, A Ishteev, K Ivshin, H Jage, SJ Jaimes Elles, S Jakobsen, E Jans, BK Jashal, A Jawahery, C Jayaweera, V Jevtic, Z Jia, E Jiang, X Jiang, Y Jiang, YJ Jiang, N Jindal, M John, A John Rubesh Rajan, D Johnson, CR Jones, TP Jones, S Joshi, B Jost, J Juan Castella, N Jurik, I Juszczak, D Kaminaris, S Kandybei, M Kane, Y Kang, C Kar, M Karacson, A Kauniskangas, JW Kautz, MK Kazanecki, F Keizer, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, G Khreich, T Kirn, VS Kirsebom, O Kitouni, S Klaver, N Kleijne, K 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López Soliño, Q Lu, C Lucarelli, D Lucchesi, M Lucio Martinez, Y Luo, A Lupato, E Luppi, K Lynch, X-R Lyu, G M., S Maccolini, F Machefert, F Maciuc, B Mack, I Mackay, LM Mackey, LR Madhan Mohan, MJ Madurai, D Magdalinski, D Maisuzenko, JJ Malczewski, S Malde, L Malentacca, A Malinin, T Maltsev, G Manca, G Mancinelli, C Mancuso, R Manera Escalero, FM Manganella, D Manuzzi, D Marangotto, JF Marchand, R Marchevski, U Marconi, E Mariani, S Mariani, C Marin Benito, J Marks, AM Marshall, L Martel, G Martelli, G Martellotti, L Martinazzoli, M Martinelli, D Martinez Gomez, D Martinez Santos, F Martinez Vidal, A Martorell I Granollers, A Massafferri, R Matev, A Mathad, V Matiunin, C Matteuzzi, KR Mattioli, A Mauri, E Maurice, J Mauricio, P Mayencourt, J Mazorra de Cos, M Mazurek, M McCann, TH McGrath, NT McHugh, A McNab, R McNulty, B Meadows, G Meier, D Melnychuk, D Mendoza Granada, FM Meng, M Merk, A Merli, L Meyer Garcia, D Miao, H Miao, M Mikhasenko, DA Milanes, A Minotti, E Minucci, T 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Abstract:

The observation of a wide peaking structure in the B c + γ mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb − 1 . The statistical significance over the background-only hypothesis exceeds seven standard deviations. The width of the observed structure is larger than the expectation from a single-peak hypothesis, and is well described by an effective minimal model consisting of two narrow peaks located at 6704.8 ± 5.5 ± 2.8 ± 0.3 MeV / c 2 and 6752.4 ± 9.5 ± 3.1 ± 0.3 MeV / c 2 . The uncertainty terms are statistical, systematic, and associated to the knowledge of the B c + mass, respectively. The measured peak locations are in line with theoretical predictions for lowest excited P -wave B c + states, marking the first observation of orbitally excited beauty-charm mesons and providing important insights into the internal dynamics of hadrons containing two heavy quarks.