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Insertion of STC into TRT at the Department of Physics, Oxford
Credit: CERN

Malcolm John

Associate Professor of Experimental Particle Physics

Research theme

  • Fundamental particles and interactions

Sub department

  • Particle Physics

Research groups

  • LHCb
malcolm.john@physics.ox.ac.uk
Telephone: 01865 (2)73401
Denys Wilkinson Building, room 670
  • About
  • Publications

The LHCb VELO Upgrade module construction

Journal of Instrumentation IOP Publishing 19:06 (2024) P06023

Authors:

K Akiba, M Alexander, C Bertella, A Biolchini, A Bitadze, G Bogdanova, S Borghi, TJV Bowcock, K Bridges, M Brock, AT Burke, J Buytaert, W Byczynski, J Carroll, V Coco, P Collins, A Davis, O De Aguiar Francisco, K De Bruyn, S De Capua, K De Roo, F Doherty, L Douglas, L Dufour, M John

Abstract:

The LHCb detector has undergone a major upgrade for LHC Run 3. This Upgrade I detector facilitates operation at higher luminosity and utilises full-detector information at the LHC collision rate, critically including the use of vertex information. A new vertex locator system, the VELO Upgrade, has been constructed. The core element of the new VELO are the double-sided pixelated hybrid silicon detector modules which operate in vacuum close to the LHC beam in a high radiation environment. The construction and quality assurance tests of these modules are described in this paper. The modules incorporate 200 μm thick, n-on-p silicon sensors bump-bonded to 130 nm technology ASICs. These are attached with high precision to a silicon microchannel substrate that uses evaporative CO2 cooling. The ASICs are controlled and read out with flexible printed circuits that are glued to the substrate and wire-bonded to the chips. The mechanical support of the module is given by a carbon fibre plate, two carbon fibre rods and an aluminium plate. The sensor attachment was achieved with an average precision of 21 μm, more than 99.5% of all pixels are fully functional, and a thermal figure of merit of 3 Kcm2W-1 was achieved. The production of the modules was successfully completed in 2021, with the final assembly and installation completed in time for data taking in 2022.
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Modification of χc1(3872) and ψ(2S) Production in pPb Collisions at sNN=8.16 TeV

Physical Review Letters American Physical Society (APS) 132:24 (2024) 242301

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, B Adeva, M Adinolfi, P Adlarson, C Agapopoulou, CA Aidala, Z Ajaltouni, S Akar, K Akiba, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, JL Amey, Y Amhis, L An, L Anderlini, M Andersson, A Andreianov, P Andreola, M Andreotti, D Andreou, AA Anelli, D Ao, F Archilli, M Argenton, S Arguedas Cuendis, A Artamonov, M Artuso, E Aslanides, M Atzeni, B Audurier, D Bacher, I Bachiller Perea, S Bachmann, M Bachmayer, JJ Back, A Bailly-Reyre, P Baladron Rodriguez, V Balagura, W Baldini, J Baptista de Souza Leite, M Barbetti, IR Barbosa, RJ Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, JM Basels, G Bassi, B Batsukh, A Battig, A Bay, A Beck, M Becker, F Bedeschi, IB Bediaga, A Beiter, S Belin, V Bellee, K Belous, I Belov, I Belyaev, G Benane, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, S Bernet Andres, HC Bernstein, C Bertella, A Bertolin, C Betancourt, F Betti, J Bex, Ia Bezshyiko, J Bhom, MS Bieker, NV Biesuz, P Billoir, A Biolchini, M Birch, FCR Bishop, A Bitadze, A Bizzeti, MP Blago, T Blake, F Blanc, JE Blank, S Blusk, D Bobulska, V Bocharnikov, JA Boelhauve, O Boente Garcia, T Boettcher, A Bohare, A Boldyrev, CS Bolognani, R Bolzonella, N Bondar, F Borgato, S Borghi, M Borsato, JT Borsuk, SA Bouchiba, TJV Bowcock, A Boyer, C Bozzi, MJ Bradley, S Braun, A Brea Rodriguez, N Breer, J Brodzicka, A Brossa Gonzalo, J Brown, D Brundu, A Buonaura, L Buonincontri, AT Burke, C Burr, A Bursche, A Butkevich, JS Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, L Calefice, S Cali, M Calvi, M Calvo Gomez, J Cambon Bouzas, P Campana, DH Campora Perez, AF Campoverde Quezada, S Capelli, L Capriotti, RC Caravaca-Mora, A Carbone, L Carcedo Salgado, R Cardinale, A Cardini, P Carniti, L Carus, A Casais Vidal, R Caspary, G Casse, J Castro Godinez, M Cattaneo, G Cavallero, V Cavallini, S Celani, J Cerasoli, D Cervenkov, S Cesare, AJ Chadwick, I Chahrour, M Charles, Ph Charpentier, CA Chavez Barajas, M Chefdeville, C Chen, S Chen, A Chernov, S Chernyshenko, V Chobanova, S Cholak, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, MF Cicala, X Cid Vidal, G Ciezarek, P Cifra, PEL Clarke, M Clemencic, HV Cliff, J Closier, JL Cobbledick, C Cocha Toapaxi, V Coco, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Comerma-Montells, L Congedo, A Contu, N Cooke, I Corredoira, A Correia, G Corti, JJ Cottee Meldrum, B Couturier, DC Craik, M Cruz Torres, R Currie, CL Da Silva, S Dadabaev, L Dai, X Dai, E Dall'Occo, J Dalseno, C D'Ambrosio, J Daniel, A Danilina, P d'Argent, A Davidson, JE Davies, A Davis, O De Aguiar Francisco, C De Angelis, 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, D De Simone, P De Simone, F De Vellis, JA de Vries, F Debernardis, D Decamp, V Dedu, 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, V Dobishuk, AD Docheva, A Dolmatov, C Dong, AM Donohoe, F Dordei, AC Dos Reis, L Douglas, AG Downes, W Duan, P Duda, MW Dudek, L Dufour, V Duk, P Durante, MM Duras, JM Durham, D Dutta, A Dziurda, A Dzyuba, S Easo, E Eckstein, U Egede, A Egorychev, V Egorychev, C Eirea Orro, S Eisenhardt, E Ejopu, S Ek-In, L Eklund, M Elashri, J Ellbracht, S Ely, A Ene, E Epple, S Escher, J Eschle, S Esen, T Evans, F Fabiano, LN Falcao, Y Fan, B Fang, L Fantini, M Faria, K Farmer, D Fazzini, L Felkowski, M Feng, M Feo, M Fernandez Gomez, AD Fernez, F Ferrari, F Ferreira Rodrigues, S Ferreres Sole, M Ferrillo, M Ferro-Luzzi, S Filippov, RA Fini, M Fiorini, M Firlej, KM Fischer, DS Fitzgerald, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, LF Foreman, R Forty, D Foulds-Holt, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, DA Friday, L Frontini, J Fu, Q Fuehring, Y Fujii, T Fulghesu, E Gabriel, G Galati, MD Galati, A Gallas Torreira, D Galli, S Gambetta, M Gandelman, P Gandini, H Gao, R Gao, Y Gao, Y Gao, Y Gao, M Garau, LM Garcia Martin, P Garcia Moreno, J García Pardiñas, B Garcia Plana, KG Garg, L Garrido, C Gaspar, RE Geertsema, LL Gerken, E Gersabeck, M Gersabeck, T Gershon, Z Ghorbanimoghaddam, L Giambastiani, FI Giasemis, V Gibson, HK Giemza, AL Gilman, M Giovannetti, A Gioventù, P Gironella Gironell, C Giugliano, MA Giza, EL Gkougkousis, FC Glaser, VV Gligorov, C Göbel, E Golobardes, D Golubkov, A Golutvin, A Gomes, S Gomez Fernandez, F Goncalves Abrantes, M Goncerz, G Gong, JA Gooding, IV Gorelov, C Gotti, 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, M Guittiere, V Guliaeva, PA Günther, A-K Guseinov, E Gushchin, Y Guz, T Gys, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, J Haimberger, M Hajheidari, T Halewood-Leagas, MM Halvorsen, PM Hamilton, J Hammerich, Q Han, X Han, S Hansmann-Menzemer, L Hao, N Harnew, T Harrison, M Hartmann, C Hasse, J He, K Heijhoff, F Hemmer, C Henderson, RDL Henderson, AM Hennequin, K Hennessy, L Henry, J Herd, J Heuel, A Hicheur, D Hill, SE Hollitt, J Horswill, R Hou, Y Hou, N Howarth, J Hu, J Hu, W Hu, X Hu, W Huang, W Hulsbergen, RJ Hunter, M Hushchyn, D Hutchcroft, M Idzik, D Ilin, P Ilten, A Inglessi, A Iniukhin, A Ishteev, K Ivshin, R Jacobsson, H Jage, SJ Jaimes Elles, S Jakobsen, E Jans, BK Jashal, A Jawahery, V Jevtic, E Jiang, X Jiang, Y Jiang, YJ Jiang, M John, D Johnson, CR Jones, TP Jones, S Joshi, B Jost, N Jurik, I Juszczak, D Kaminaris, S Kandybei, Y Kang, M Karacson, D Karpenkov, M Karpov, AM Kauniskangas, JW Kautz, F Keizer, DM Keller, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, G Khreich, T Kirn, VS Kirsebom, O Kitouni, S Klaver, N Kleijne, K Klimaszewski, MR Kmiec, S Koliiev, L Kolk, A Konoplyannikov, P Kopciewicz, P Koppenburg, M Korolev, I Kostiuk, O Kot, S Kotriakhova, A Kozachuk, P Kravchenko, L Kravchuk, M Kreps, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, J Kubat, S Kubis, W Kucewicz, M Kucharczyk, V Kudryavtsev, E Kulikova, A Kupsc, BK Kutsenko, D Lacarrere, G Lafferty, A Lai, A Lampis, D Lancierini, C Landesa Gomez, JJ Lane, R Lane, C Langenbruch, J Langer, O Lantwin, T Latham, F Lazzari, C Lazzeroni, R Le Gac, SH Lee, R Lefèvre, A Leflat, S Legotin, M Lehuraux, O Leroy, T Lesiak, B Leverington, A Li, H Li, K Li, L Li, P Li, P-R Li, S Li, T Li, T Li, Y Li, Y Li, Z Li, Z Lian, X Liang, C Lin, T Lin, R Lindner, V Lisovskyi, R Litvinov, G Liu, H Liu, K Liu, Q Liu, S Liu, Y Liu, Y Liu, YL Liu, A Lobo Salvia, A Loi, J Lomba Castro, T Long, JH Lopes, A Lopez Huertas, S López Soliño, GH Lovell, C Lucarelli, D Lucchesi, S Luchuk, M Lucio Martinez, V Lukashenko, Y Luo, A Lupato, E Luppi, K Lynch, X-R Lyu, GM Ma, R Ma, S Maccolini, F Machefert, F Maciuc, I Mackay, LR Madhan Mohan, MM Madurai, A Maevskiy, D Magdalinski, D Maisuzenko, MW Majewski, JJ Malczewski, S Malde, B Malecki, L Malentacca, A Malinin, T Maltsev, G Manca, G Mancinelli, C Mancuso, R Manera Escalero, D Manuzzi, D Marangotto, JF Marchand, R Marchevski, U Marconi, S Mariani, C Marin Benito, J Marks, AM Marshall, PJ Marshall, G Martelli, G Martellotti, L Martinazzoli, M Martinelli, D Martinez Santos, F Martinez Vidal, A Massafferri, M Materok, R Matev, A Mathad, V Matiunin, C Matteuzzi, KR Mattioli, A Mauri, E Maurice, J Mauricio, P Mayencourt, M Mazurek, M McCann, L Mcconnell, TH McGrath, NT McHugh, A McNab, R McNulty, B Meadows, G Meier, D Melnychuk, M Merk, A Merli, L Meyer Garcia, D Miao, H Miao, M Mikhasenko, DA Milanes, A Minotti, E Minucci, T Miralles, SE Mitchell, B Mitreska, DS Mitzel, A Modak, A Mödden, RA Mohammed, RD Moise, S Mokhnenko, T Mombächer, M Monk, IA Monroy, S Monteil, A Morcillo Gomez, G Morello, MJ Morello, MP Morgenthaler, J Moron, AB Morris, AG Morris, R Mountain, H Mu, ZM Mu, E Muhammad, F Muheim, M Mulder, K Müller, F Mũnoz-Rojas, R Murta, P Naik, T Nakada, R Nandakumar, T Nanut, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, P Neustroev, R Newcombe, J Nicolini, D Nicotra, EM Niel, N Nikitin, P Nogga, NS Nolte, C Normand, J Novoa Fernandez, G Nowak, C Nunez, HN Nur, A Oblakowska-Mucha, V Obraztsov, T Oeser, S Okamura, A Okhotnikov, R Oldeman, F Oliva, M Olocco, CJG Onderwater, RH O'Neil, JM Otalora Goicochea, T Ovsiannikova, P Owen, A Oyanguren, O Ozcelik, KO Padeken, B Pagare, PR Pais, T Pajero, A Palano, M Palutan, G Panshin, L Paolucci, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, C Parkes, B Passalacqua, G Passaleva, D Passaro, A Pastore, M Patel, J Patoc, C Patrignani, CJ Pawley, A Pellegrino, M Pepe Altarelli, S Perazzini, D Pereima, A Pereiro Castro, P Perret, A Perro, K Petridis, A Petrolini, S Petrucci, H Pham, L Pica, M Piccini, B Pietrzyk, G Pietrzyk, D Pinci, F Pisani, M Pizzichemi, V Placinta, M Plo Casasus, F Polci, M Poli Lener, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, S Ponce, D Popov, S Poslavskii, K Prasanth, L Promberger, C Prouve, V Pugatch, V Puill, G Punzi, HR Qi, W Qian, N Qin, S Qu, R Quagliani, RI Rabadan Trejo, B Rachwal, JH Rademacker, M Rama, M Ramírez García, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Rebollo De Miguel, F Redi, J Reich, F Reiss, Z Ren, PK Resmi, R Ribatti, GR Ricart, D Riccardi, S Ricciardi, K Richardson, M Richardson-Slipper, K Rinnert, P Robbe, G Robertson, E Rodrigues, E Rodriguez Fernandez, JA Rodriguez Lopez, E Rodriguez Rodriguez, A Rogovskiy, DL Rolf, A Rollings, P Roloff, V Romanovskiy, M Romero Lamas, A Romero Vidal, G Romolini, F Ronchetti, M Rotondo, SR Roy, MS Rudolph, T Ruf, M Ruiz Diaz, RA Ruiz Fernandez, J Ruiz Vidal, A Ryzhikov, J Ryzka, JJ Saborido Silva, R Sadek, N Sagidova, N Sahoo, B Saitta, M Salomoni, C Sanchez Gras, I Sanderswood, R Santacesaria, C Santamarina Rios, M Santimaria, L Santoro, E Santovetti, A Saputi, D Saranin, G Sarpis, M Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, H Sazak, LG Scantlebury Smead, A Scarabotto, S Schael, S Scherl, AM Schertz, M Schiller, H Schindler, M Schmelling, B Schmidt, S Schmitt, H Schmitz, O Schneider, A Schopper, N Schulte, S Schulte, MH Schune, R Schwemmer, G Schwering, B Sciascia, A Sciuccati, S Sellam, A Semennikov, M Senghi Soares, A Sergi, N Serra, L Sestini, A Seuthe, Y Shang, DM Shangase, M Shapkin, I Shchemerov, L Shchutska, T Shears, L Shekhtman, Z Shen, S Sheng, V Shevchenko, B Shi, EB Shields, Y Shimizu, E Shmanin, R Shorkin, JD Shupperd, R Silva Coutinho, G Simi, S Simone, N Skidmore, R Skuza, T Skwarnicki, MW Slater, JC Smallwood, E Smith, K Smith, M Smith, A Snoch, L Soares Lavra, MD Sokoloff, FJP Soler, A Solomin, A Solovev, I Solovyev, R Song, Y Song, Y Song, YS Song, FL Souza De Almeida, B Souza De Paula, E Spadaro Norella, E Spedicato, JG Speer, E Spiridenkov, P Spradlin, V Sriskaran, F Stagni, M Stahl, S Stahl, S Stanislaus, EN Stein, O Steinkamp, O Stenyakin, H Stevens, D Strekalina, Y Su, F Suljik, J Sun, L Sun, Y Sun, PN Swallow, K Swientek, F Swystun, A Szabelski, T Szumlak, M Szymanski, Y Tan, S Taneja, MD Tat, A Terentev, F Terzuoli, F Teubert, E Thomas, DJD Thompson, H Tilquin, V Tisserand, S T'Jampens, M Tobin, L Tomassetti, G Tonani, X Tong, D Torres Machado, L Toscano, DY Tou, C Trippl, G Tuci, N Tuning, LH Uecker, A Ukleja, DJ Unverzagt, E Ursov, A Usachov, A Ustyuzhanin, U Uwer, V Vagnoni, A Valassi, G Valenti, N Valls Canudas, H Van Hecke, E van Herwijnen, CB Van Hulse, R Van Laak, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, JJ Velthuis, M Veltri, A Venkateswaran, M Vesterinen, D Vieira, M Vieites Diaz, X Vilasis-Cardona, E Vilella Figueras, A Villa, P Vincent, FC Volle, D Vom Bruch, V Vorobyev, N Voropaev, K Vos, G Vouters, C Vrahas, J Walsh, EJ Walton, G Wan, C Wang, G Wang, J Wang, J Wang, J Wang, J Wang, M Wang, NW Wang, R Wang, X Wang, XW Wang, Y Wang, Z Wang, Z Wang, Z Wang, JA Ward, NK Watson, D Websdale, Y Wei, BDC Westhenry, DJ White, M Whitehead, AR Wiederhold, D Wiedner, G Wilkinson, MK Wilkinson, M Williams, MRJ Williams, R Williams, FF Wilson, W Wislicki, M Witek, L Witola, CP Wong, G Wormser, SA Wotton, H Wu, J Wu, Y Wu, K Wyllie, S Xian, Z Xiang, Y Xie, A Xu, J Xu, L Xu, L Xu, M Xu, Z Xu, Z Xu, Z Xu, D Yang, S Yang, X Yang, Y Yang, Z Yang, Z Yang, V Yeroshenko, H Yeung, H Yin, CY Yu, J Yu, X Yuan, E Zaffaroni, M Zavertyaev, M Zdybal, M Zeng, C Zhang, D Zhang, J Zhang, L Zhang, S Zhang, S Zhang, Y Zhang, Y Zhang, YZ Zhang, Y Zhao, A Zharkova, A Zhelezov, XZ Zheng, Y Zheng, T Zhou, X Zhou, Y Zhou, V Zhovkovska, LZ Zhu, X Zhu, X Zhu, Z Zhu, V Zhukov, J Zhuo, Q Zou, D Zuliani, G Zunica
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Observation of Λb0→Λc+D¯(∗)0K- and Λb0→Λc+Ds∗- decays

European Physical Journal C Springer Nature 84:6 (2024) 575

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, B Adeva, M Adinolfi, P Adlarson, C Agapopoulou, CA Aidala, Z Ajaltouni, S Akar, K Akiba, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, JL Amey, Y Amhis, L An, L Anderlini, M Andersson, A Andreianov, P Andreola, M Andreotti, D Andreou, A Anelli, D Ao, F Archilli, M Argenton, S Arguedas Cuendis, A Artamonov, M Artuso, E Aslanides, M Atzeni, B Audurier, D Bacher, I Bachiller Perea, S Bachmann, M Bachmayer, JJ Back, P Baladron Rodriguez, V Balagura, W Baldini, J Baptista de Souza Leite, M Barbetti, IR Barbosa, RJ Barlow, S Barsuk, W Barter, M Bartolini, J Bartz, F Baryshnikov, JM Basels, G Bassi, B Batsukh, A Battig, A Bay, A Beck, M Becker, F Bedeschi, IB Bediaga, A Beiter, S Belin, V Bellee, K Belous, I Belov, I Belyaev, G Benane, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, S Bernet Andres, HC Bernstein, C Bertella, A Bertolin, C Betancourt, F Betti, J Bex, Ia Bezshyiko, J Bhom, MS Bieker, NV Biesuz, P Billoir, A Biolchini, M Birch, FCR Bishop, A Bitadze, A Bizzeti, MP Blago, T Blake, F Blanc, JE Blank, S Blusk, D Bobulska, V Bocharnikov, JA Boelhauve, O Boente Garcia, T Boettcher, A Bohare, A Boldyrev, CS Bolognani, R Bolzonella, N Bondar, F Borgato, S Borghi, M Borsato, JT Borsuk, SA Bouchiba, TJV Bowcock, A Boyer, C Bozzi, MJ Bradley, S Braun, A Brea Rodriguez, N Breer, J Brodzicka, A Brossa Gonzalo, J Brown, D Brundu, A Buonaura, L Buonincontri, AT Burke, C Burr, A Bursche, A Butkevich, JS Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, L Calefice, S Cali, M Calvi, M Calvo Gomez, J 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, J Castro Godinez, M Cattaneo, G Cavallero, V Cavallini, S Celani, J Cerasoli, D Cervenkov, S Cesare, AJ Chadwick, I Chahrour, M Charles, Ph Charpentier, CA Chavez Barajas, M Chefdeville, C Chen, S Chen, Z Chen, A Chernov, S Chernyshenko, V Chobanova, S Cholak, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, MF Cicala, X Cid Vidal, G Ciezarek, P Cifra, PEL Clarke, M Clemencic, HV Cliff, J Closier, JL Cobbledick, C Cocha Toapaxi, V Coco, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Comerma-Montells, L Congedo, A Contu, N Cooke, I Corredoira, A Correia, G Corti, JJ Cottee Meldrum, B Couturier, DC Craik, M Cruz Torres, R Currie, CL Da Silva, S Dadabaev, L Dai, X Dai, E Dall’Occo, J Dalseno, C D’Ambrosio, J Daniel, A Danilina, P d’Argent, A Davidson, JE Davies, A Davis, O De Aguiar Francisco, C De Angelis, 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, D De Simone, P De Simone, F De Vellis, JA de Vries, F Debernardis, D Decamp, V Dedu, 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, V Dobishuk, AD Docheva, A Dolmatov, C Dong, AM Donohoe, F Dordei, AC dos Reis, L Douglas, AG Downes, W Duan, P Duda, MW Dudek, L Dufour, V Duk, P Durante, MM Duras, JM Durham, A Dziurda, A Dzyuba, S Easo, E Eckstein, U Egede, A Egorychev, V Egorychev, C Eirea Orro, S Eisenhardt, E Ejopu, S Ek-In, L Eklund, M Elashri, J Ellbracht, S Ely, A Ene, E Epple, S Escher, J Eschle, S Esen, T Evans, F Fabiano, LN Falcao, Y Fan, B Fang, L Fantini, M Faria, K Farmer, D Fazzini, L Felkowski, M Feng, M Feo, M Fernandez Gomez, AD Fernez, F Ferrari, F Ferreira Rodrigues, S Ferreres Sole, M Ferrillo, M Ferro-Luzzi, S Filippov, RA Fini, M Fiorini, M Firlej, KM Fischer, DS Fitzgerald, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, LF Foreman, R Forty, D Foulds-Holt, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, DA Friday, L Frontini, J Fu, Q Fuehring, Y Fujii, T Fulghesu, E Gabriel, G Galati, MD Galati, A Gallas Torreira, D Galli, S Gambetta, M Gandelman, P Gandini, H Gao, R Gao, Y Gao, Y Gao, Y Gao, M Garau, LM Garcia Martin, P Garcia Moreno, J García Pardiñas, B Garcia Plana, KG Garg, L Garrido, C Gaspar, RE Geertsema, LL Gerken, E Gersabeck, M Gersabeck, T Gershon, Z Ghorbanimoghaddam, L Giambastiani, FI Giasemis, V Gibson, HK Giemza, AL Gilman, M Giovannetti, A Gioventù, P Gironella Gironell, C Giugliano, MA Giza, EL Gkougkousis, FC Glaser, VV Gligorov, C Göbel, E Golobardes, D Golubkov, A Golutvin, A Gomes, S Gomez Fernandez, F Goncalves Abrantes, M Goncerz, G Gong, JA Gooding, IV Gorelov, C Gotti, 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, M Guittiere, V Guliaeva, PA Günther, A-K Guseinov, E Gushchin, Y Guz, T Gys, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, J Haimberger, M Hajheidari, T Halewood-leagas, MM Halvorsen, PM Hamilton, J Hammerich, Q Han, X Han, S Hansmann-Menzemer, L Hao, N Harnew, T Harrison, M Hartmann, C Hasse, J He, K Heijhoff, F Hemmer, C Henderson, RDL Henderson, AM Hennequin, K Hennessy, L Henry, J Herd, P Herrero Gascon, J Heuel, A Hicheur, D Hill, SE Hollitt, J Horswill, R Hou, Y Hou, N Howarth, J Hu, J Hu, W Hu, X Hu, W Huang, W Hulsbergen, RJ Hunter, M Hushchyn, D Hutchcroft, M Idzik, D Ilin, P Ilten, A Inglessi, A Iniukhin, A Ishteev, K Ivshin, R Jacobsson, H Jage, SJ Jaimes Elles, S Jakobsen, E Jans, BK Jashal, A Jawahery, V Jevtic, E Jiang, X Jiang, Y Jiang, YJ Jiang, M John, D Johnson, CR Jones, TP Jones, S Joshi, B Jost, N Jurik, I Juszczak, D Kaminaris, S Kandybei, Y Kang, M Karacson, D Karpenkov, M Karpov, AM Kauniskangas, JW Kautz, F Keizer, DM Keller, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, G Khreich, T Kirn, VS Kirsebom, O Kitouni, S Klaver, N Kleijne, K Klimaszewski, MR Kmiec, S Koliiev, L Kolk, A Konoplyannikov, P Kopciewicz, P Koppenburg, M Korolev, I Kostiuk, O Kot, S Kotriakhova, A Kozachuk, P Kravchenko, L Kravchuk, M Kreps, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, J Kubat, S Kubis, W Kucewicz, M Kucharczyk, V Kudryavtsev, E Kulikova, A Kupsc, BK Kutsenko, D Lacarrere, A Lai, A Lampis, D Lancierini, C Landesa Gomez, JJ Lane, R Lane, C Langenbruch, J Langer, O Lantwin, T Latham, F Lazzari, C Lazzeroni, R Le Gac, SH Lee, R Lefèvre, A Leflat, S Legotin, M Lehuraux, O Leroy, T Lesiak, B Leverington, A Li, H Li, K Li, L Li, P Li, P-R Li, S Li, T Li, T Li, Y Li, Y Li, Z Li, Z Lian, X Liang, C Lin, T Lin, R Lindner, V Lisovskyi, R Litvinov, G Liu, H Liu, K Liu, Q Liu, S Liu, Y Liu, Y Liu, YL Liu, A Lobo Salvia, A Loi, J Lomba Castro, T Long, JH Lopes, A Lopez Huertas, SL ópez Soliño, GH Lovell, C Lucarelli, D Lucchesi, S Luchuk, M Lucio Martinez, V Lukashenko, Y Luo, A Lupato, E Luppi, K Lynch, X-R Lyu, G M., R Ma, S Maccolini, F Machefert, F Maciuc, I Mackay, LR Madhan Mohan, MM Madurai, A Maevskiy, D Magdalinski, D Maisuzenko, MW Majewski, JJ Malczewski, S 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K Prasanth, C Prouve, V Pugatch, G Punzi, W Qian, N Qin, S Qu, R Quagliani, RI Rabadan Trejo, B Rachwal, JH Rademacker, M Rama, M Ramírez García, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Rebollo De Miguel, F Redi, J Reich, F Reiss, Z Ren, PK Resmi, R Ribatti, GR Ricart, D Riccardi, S Ricciardi, K Richardson, M Richardson-Slipper, K Rinnert, P Robbe, G Robertson, E Rodrigues, E Rodriguez Fernandez, JA Rodriguez Lopez, E Rodriguez Rodriguez, A Rogovskiy, DL Rolf, A Rollings, P Roloff, V Romanovskiy, M Romero Lamas, A Romero Vidal, G Romolini, F Ronchetti, M Rotondo, SR Roy, MS Rudolph, T Ruf, M Ruiz Diaz, RA Ruiz Fernandez, J Ruiz Vidal, A Ryzhikov, J Ryzka, JJ Saborido Silva, R Sadek, N Sagidova, N Sahoo, B Saitta, M Salomoni, C Sanchez Gras, I Sanderswood, R Santacesaria, C Santamarina Rios, M Santimaria, L Santoro, E Santovetti, A Saputi, D Saranin, G Sarpis, M Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, H Sazak, LG Scantlebury Smead, A Scarabotto, S Schael, S 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Swystun, A Szabelski, T Szumlak, M Szymanski, Y Tan, S Taneja, MD Tat, A Terentev, F Terzuoli, F Teubert, E Thomas, DJD Thompson, H Tilquin, V Tisserand, S T’Jampens, M Tobin, L Tomassetti, G Tonani, X Tong, D Torres Machado, L Toscano, DY Tou, C Trippl, G Tuci, N Tuning, LH Uecker, A Ukleja, DJ Unverzagt, E Ursov, A Usachov, A Ustyuzhanin, U Uwer, V Vagnoni, A Valassi, G Valenti, N Valls Canudas, H Van Hecke, E van Herwijnen, CB Van Hulse, R Van Laak, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, CV ázquez Sierra, S Vecchi, JJ Velthuis, M Veltri, A Venkateswaran, M Vesterinen, M Vieites Diaz, X Vilasis-Cardona, E Vilella Figueras, A Villa, P Vincent, FC Volle, D vom Bruch, V Vorobyev, N Voropaev, K Vos, G Vouters, C Vrahas, J Walsh, EJ Walton, G Wan, C Wang, G Wang, J Wang, J Wang, J Wang, J Wang, M Wang, NW Wang, R Wang, X Wang, XW Wang, Y Wang, Z Wang, Z Wang, Z Wang, JA Ward, NK Watson, D Websdale, Y Wei, BDC Westhenry, DJ White, M Whitehead, AR Wiederhold, D Wiedner, G Wilkinson, MK Wilkinson, M Williams, MRJ Williams, R Williams, FF Wilson, W Wislicki, M Witek, L Witola, CP Wong, G Wormser, SA Wotton, H Wu, J Wu, Y Wu, K Wyllie, S Xian, Z Xiang, Y Xie, A Xu, J Xu, L Xu, L Xu, M Xu, Z Xu, Z Xu, Z Xu, D Yang, S Yang, X Yang, Y Yang, Z Yang, Z Yang, V Yeroshenko, H Yeung, H Yin, CY Yu, J Yu, X Yuan, E Zaffaroni, M Zavertyaev, M Zdybal, M Zeng, C Zhang, D Zhang, J Zhang, L Zhang, S Zhang, S Zhang, Y Zhang, Y Zhang, YZ Zhang, Y Zhao, A Zharkova, A Zhelezov, XZ Zheng, Y Zheng, T Zhou, X Zhou, Y Zhou, V Zhovkovska, LZ Zhu, X Zhu, X Zhu, Z Zhu, V Zhukov, J Zhuo, Q Zou, D Zuliani, G Zunica
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Measurements of the branching fraction ratio B ϕ → μ + μ − / B ϕ → e + e − with charm meson decays

Journal of High Energy Physics Springer 2024:5 (2024) 293

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, B Adeva, M Adinolfi, P Adlarson, C Agapopoulou, CA Aidala, Z Ajaltouni, S Akar, K Akiba, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, JL Amey, Y Amhis, D Bacher

Abstract:

Measurements of the branching fraction ratio Bϕ→μ+μ−/Bϕ→e+e− with Ds+→π+ϕ and D+→ π+ϕ decays, denoted Rϕπs and Rϕπd, are presented. The analysis is performed using a dataset corresponding to an integrated luminosity of 5.4 fb−1 of pp collision data collected with the LHCb experiment. The branching fractions are normalised with respect to the B+ → K+J/ψ(→ e+e−) and B+ → K+J/ψ(→ μ+μ−) decay modes. The combination of the results yieldsRϕπ=1.022±0.012stat±0.048syst. The result is compatible with previous measurements of the ϕ → ℓ+ℓ− branching fractions and predictions based on the Standard Model.
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Measurement of associated J/ψ - ψ (2 S ) production cross-section in pp collisions at s = 13 TeV

Journal of High Energy Physics Springer 2024:5 (2024) 259

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, B Adeva, M Adinolfi, P Adlarson, H Afsharnia, C Agapopoulou, CA Aidala, Z Ajaltouni, S Akar, K Akiba, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, JL Amey, D Bacher

Abstract:

The cross-section of associated J/ψ-ψ(2S) production in proton-proton collisions at a centre-of-mass energy of s = 13 TeV is measured using a data sample corresponding to an integrated luminosity of 4.2 fb−1, collected by the LHCb experiment. The measurement is performed for both J/ψ and ψ(2S) mesons having transverse momentum pT< 14 GeV/c and rapidity 2.0 < y < 4.5, assuming negligible polarisation of the J/ψ and ψ(2S) mesons. The production cross-section is measured to be 4.5 ± 0.7 ± 0.3 nb, where the first uncertainty is statistical and the second systematic. The differential cross-sections are measured as functions of several kinematic variables of the J/ψ-ψ(2S) candidates. The results are combined with a measurement of J/ψ-J/ψ production, giving a cross-section ratio between J/ψ-ψ(2S) and J/ψ-J/ψ production of 0.274 ± 0.044 ± 0.008, where the first uncertainty is statistical and the second systematic.
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