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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 Upgrade I

Journal of Instrumentation IOP Publishing 19:05 (2024) P05065

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, C Achard, 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

Abstract:

The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software.
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A measurement of ∆Γs

Journal of High Energy Physics Springer Nature 2024:5 (2024) 253

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, Y Amhis, L An, L Anderlini, M Andersson, A Andreianov, P Andreola, M Andreotti, D Andreou, AA Anelli, D Ao, F Archilli, 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, 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, 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, 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, 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, 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, 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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Multiplicity dependence of σ ψ (2 S ) /σ J/ψ in pp collisions at s = 13 TeV

Journal of High Energy Physics Springer 2024:5 (2024) 243

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:

The ratio of production cross-sections of ψ(2S) over J/ψ mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy s = 13 TeV is measured with a data sample collected by the LHCb detector, corresponding to an integrated luminosity of 658 pb−1. The ratio is measured for both prompt and non-prompt ψ(2S) and J/ψ mesons. When there is an overlap between the rapidity ranges over which multiplicity and charmonia production are measured, a multiplicity-dependent modification of the ratio is observed for prompt mesons. No significant multiplicity dependence is found when the ranges do not overlap. For non-prompt production, the ψ(2S)-to-J/ψ production ratio is roughly independent of multiplicity, irrespective of the rapidity range over which the multiplicity is measured. The results are compared to predictions of the co-mover model and agree well except in the low multiplicity region. The ratio of production cross-sections of ψ(2S) over J/ψ mesons are cross-checked with other measurements in di-lepton channels and found to be compatible.
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Climate change, malaria and neglected tropical diseases: a scoping review

Transactions of the Royal Society of Tropical Medicine and Hygiene Oxford University Press (2024) trae026

Authors:

Petra Klepac, Jennifer L Hsieh, Camilla L Ducker, Mohamad Assoum, Mark Booth, Isabel Byrne, Sarity Dodson, Diana L Martin, C Michael R Turner, Kim R van Daalen, Bernadette Abela, Jennifer Akamboe, Fabiana Alves, Simon J Brooker, Karen Ciceri-Reynolds, Jeremy Cole, Aidan Desjardins, Chris Drakeley, Dileepa S Ediriweera, Neil M Ferguson, Albis Francesco Gabrielli, Joshua Gahir, Saurabh Jain, Mbaraka R John, Elizabeth Juma, Priya Kanayson, Kebede Deribe, Jonathan D King, Andrea M Kipingu, Samson Kiware, Jan Kolaczinski, Winnie J Kulei, Tajiri L Laizer, Vivek Lal, Rachel Lowe, Janice S Maige, Sam Mayer, Lachlan McIver, Jonathan F Mosser, Ruben Santiago Nicholls, Cláudio Nunes-Alves, Junaid Panjwani, Nishanth Parameswaran, Karen Polson, Hale-Seda Radoykova, Aditya Ramani, Lisa J Reimer, Zachary M Reynolds, Isabela Ribeiro, Alastair Robb

Abstract:

To explore the effects of climate change on malaria and 20 neglected tropical diseases (NTDs), and potential effect amelioration through mitigation and adaptation, we searched for papers published from January 2010 to October 2023. We descriptively synthesised extracted data. We analysed numbers of papers meeting our inclusion criteria by country and national disease burden, healthcare access and quality index (HAQI), as well as by climate vulnerability score. From 42 693 retrieved records, 1543 full-text papers were assessed. Of 511 papers meeting the inclusion criteria, 185 studied malaria, 181 dengue and chikungunya and 53 leishmaniasis; other NTDs were relatively understudied. Mitigation was considered in 174 papers (34%) and adaption strategies in 24 (5%). Amplitude and direction of effects of climate change on malaria and NTDs are likely to vary by disease and location, be non-linear and evolve over time. Available analyses do not allow confident prediction of the overall global impact of climate change on these diseases. For dengue and chikungunya and the group of non-vector-borne NTDs, the literature privileged consideration of current low-burden countries with a high HAQI. No leishmaniasis papers considered outcomes in East Africa. Comprehensive, collaborative and standardised modelling efforts are needed to better understand how climate change will directly and indirectly affect malaria and NTDs.

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Measurement of the branching fraction of B 0 → J /ψπ 0 decays

Journal of High Energy Physics Springer 2024:5 (2024) 65

Authors:

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

Abstract:

The ratio of branching fractions between B0 → J/ψπ0 and B+ → J/ψK*+ decays is measured with proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. The measured value isBB0→J/ψπ0BB+→J/ψK∗+=1.153±0.053±0.048×10−2, where the first uncertainty is statistical and the second is systematic. The branching fraction for B0 → J/ψπ0 decays is determined using the branching fraction of the normalisation channel, resulting inBB0→J/ψπ0=1.670±0.077±0.069±0.095×10−5, where the last uncertainty corresponds to that of the external input. This result is consistent with the current world average value and competitive with the most precise single measurement to date.
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