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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

Search for B c + → π + μ + μ - decays and measurement of the branching fraction ratio B ( B c + → ψ ( 2 S ) π + ) / B ( B c + → J / ψ π + )

The European Physical Journal C SpringerOpen 84:5 (2024) 468

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 first search for nonresonant Bc+→π+μ+μ- decays is reported. The analysis uses proton–proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9fb-1. No evidence for an excess of signal events over background is observed and an upper limit is set on the branching fraction ratio B(Bc+→π+μ+μ-)/B(Bc+→J/ψπ+)<2.1×10-4 at 90% confidence level. Additionally, an updated measurement of the ratio of the Bc+→ψ(2S)π+ and Bc+→J/ψπ+ branching fractions is reported. The ratio B(Bc+→ψ(2S)π+)/B(Bc+→J/ψπ+) is measured to be 0.254±0.018±0.003±0.005, where the first uncertainty is statistical, the second systematic, and the third is due to the uncertainties on the branching fractions of the leptonic J/ψ and ψ(2S) decays. This measurement is the most precise to date and is consistent with previous LHCb results.
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Erratum to: Measurement of the Λc+ to D0 production ratio in peripheral PbPb collisions at sNN = 5.02 TeV

Journal of High Energy Physics Springer Nature 2024:5 (2024) 21

Authors:

R Aaij, ASW Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, B Adeva, M Adinolfi, H Afsharnia, C Agapopoulou, CA Aidala, S Aiola, Z Ajaltouni, S Akar, K Akiba, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, P Alvarez Cartelle, S Amato, JL Amey, Y Amhis, L An, L Anderlini, M Andersson, A Andreianov, M Andreotti, D Andreou, D Ao, F Archilli, A Artamonov, M Artuso, E Aslanides, M Atzeni, B Audurier, S Bachmann, M Bachmayer, JJ Back, A Bailly-reyre, P Baladron Rodriguez, V Balagura, W Baldini, J Baptista de Souza Leite, M Barbetti, 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, V Belavin, S Belin, V Bellee, K Belous, I Belov, I Belyaev, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, D Berninghoff, HC Bernstein, C Bertella, A Bertolin, C Betancourt, F Betti, Ia Bezshyiko, S Bhasin, J Bhom, L Bian, MS Bieker, NV Biesuz, S Bifani, P Billoir, A Biolchini, M Birch, FCR Bishop, A Bitadze, A Bizzeti, MP Blago, T Blake, F Blanc, S Blusk, D Bobulska, JA Boelhauve, O Boente Garcia, T Boettcher, A Boldyrev, N Bondar, S Borghi, M Borsato, JT Borsuk, SA Bouchiba, TJV Bowcock, A Boyer, C Bozzi, MJ Bradley, S Braun, A Brea Rodriguez, J Brodzicka, A Brossa Gonzalo, 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, R Calladine, M Calvi, M Calvo Gomez, P Camargo Magalhaes, P Campana, DH Campora Perez, AF Campoverde Quezada, S Capelli, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, I Carli, P Carniti, L Carus, A Casais Vidal, R Caspary, G Casse, M Cattaneo, G Cavallero, V Cavallini, S Celani, J Cerasoli, D Cervenkov, AJ Chadwick, MG Chapman, 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, G Ciullo, PEL Clarke, M Clemencic, HV Cliff, J Closier, JL Cobbledick, V Coco, JAB Coelho, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, L Congedo, A Contu, N Cooke, G Coombs, I Corredoira, G Corti, B Couturier, DC Craik, J Crkovská, M Cruz Torres, R Currie, CL Da Silva, S Dadabaev, L Dai, E Dall’Occo, J Dalseno, C D’Ambrosio, A Danilina, P d’Argent, JE Davies, A Davis, O De Aguiar Francisco, 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, CT Dean, F Debernardis, D Decamp, V Dedu, L Del Buono, B Delaney, H-P Dembinski, V Denysenko, O Deschamps, F Dettori, B Dey, A Di Cicco, P Di Nezza, S Didenko, L Dieste Maronas, S Ding, V Dobishuk, A Dolmatov, C Dong, AM Donohoe, F Dordei, AC dos Reis, L Douglas, AG Downes, MW Dudek, L Dufour, V Duk, P Durante, JM Durham, D Dutta, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, S Ek-In, L Eklund, S Ely, A Ene, E Epple, S Escher, J Eschle, S Esen, T Evans, LN Falcao, Y Fan, B Fang, S Farry, D Fazzini, M Feo, AD Fernez, F Ferrari, L Ferreira Lopes, 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, R Forty, D Foulds-Holt, V Franco Lima, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, DA Friday, J Fu, Q Fuehring, E Gabriel, G Galati, A Gallas Torreira, D Galli, S Gambetta, Y Gan, M Gandelman, P Gandini, Y Gao, M Garau, LM Garcia Martin, P Garcia Moreno, J García Pardiñas, B Garcia Plana, FA Garcia Rosales, L Garrido, C Gaspar, RE Geertsema, D Gerick, LL Gerken, E Gersabeck, M Gersabeck, T Gershon, L Giambastiani, V Gibson, HK Giemza, AL Gilman, M Giovannetti, A Gioventù, P Gironella Gironell, C Giugliano, K Gizdov, EL Gkougkousis, VV Gligorov, C Göbel, E Golobardes, D Golubkov, A Golutvin, A Gomes, S Gomez Fernandez, F Goncalves Abrantes, M Goncerz, G Gong, IV Gorelov, C Gotti, JP Grabowski, T Grammatico, LA Granado Cardoso, E Graugés, E Graverini, G Graziani, AT Grecu, LM Greeven, NA Grieser, L Grillo, S Gromov, BR Gruberg Cazon, C Gu, M Guarise, M Guittiere, PA Günther, E Gushchin, A Guth, Y Guz, T Gys, T Hadavizadeh, G Haefeli, C Haen, J Haimberger, SC Haines, T Halewood-leagas, MM Halvorsen, PM Hamilton, J Hammerich, Q Han, X Han, EB Hansen, S Hansmann-Menzemer, L Hao, N Harnew, T Harrison, C Hasse, M Hatch, J He, K Heijhoff, K Heinicke, RDL Henderson, AM Hennequin, K Hennessy, L Henry, J Heuel, A Hicheur, D Hill, M Hilton, SE Hollitt, R Hou, Y Hou, J Hu, J Hu, W Hu, X Hu, W Huang, X Huang, W Hulsbergen, RJ Hunter, M Hushchyn, D Hutchcroft, P Ibis, M Idzik, D Ilin, P Ilten, A Inglessi, A Iniukhin, A Ishteev, K Ivshin, R Jacobsson, H Jage, S Jakobsen, E Jans, BK Jashal, A Jawahery, V Jevtic, X Jiang, M John, D Johnson, CR Jones, TP Jones, B Jost, N Jurik, S Kandybei, Y Kang, M Karacson, D Karpenkov, M Karpov, JW Kautz, F Keizer, DM Keller, M Kenzie, T Ketel, B Khanji, A Kharisova, S Kholodenko, T Kirn, VS Kirsebom, O Kitouni, S Klaver, N Kleijne, K Klimaszewski, MR Kmiec, S Koliiev, A Kondybayeva, A Konoplyannikov, P Kopciewicz, R Kopecna, P Koppenburg, M Korolev, I Kostiuk, O Kot, S Kotriakhova, A Kozachuk, P Kravchenko, L Kravchuk, RD Krawczyk, M Kreps, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, J Kubat, W Kucewicz, M Kucharczyk, V Kudryavtsev, HS Kuindersma, GJ Kunde, D Lacarrere, G Lafferty, A Lai, A Lampis, D Lancierini, JJ Lane, R Lane, G Lanfranchi, C Langenbruch, J Langer, O Lantwin, T Latham, F Lazzari, M Lazzaroni, R Le Gac, SH Lee, R Lefèvre, A Leflat, S Legotin, P Lenisa, O Leroy, T Lesiak, B Leverington, H Li, K Li, P Li, S Li, Y Li, Z Li, X Liang, C Lin, T Lin, R Lindner, V Lisovskyi, R Litvinov, G Liu, H Liu, Q Liu, S Liu, A Lobo Salvia, A Loi, R Lollini, J Lomba Castro, I Longstaff, JH Lopes, S López Soliño, GH Lovell, Y Lu, C Lucarelli, D Lucchesi, S Luchuk, M Lucio Martinez, V Lukashenko, Y Luo, A Lupato, E Luppi, A Lusiani, K Lynch, X-R Lyu, L Ma, R Ma, S Maccolini, F Machefert, F Maciuc, V Macko, P Mackowiak, S Maddrell-Mander, LR Madhan Mohan, A Maevskiy, D Maisuzenko, MW Majewski, JJ Malczewski, S Malde, B Malecki, A Malinin, T Maltsev, H Malygina, G Manca, G Mancinelli, D Manuzzi, CA Manzari, D Marangotto, JF Marchand, U Marconi, S Mariani, C Marin Benito, M Marinangeli, 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, JV Mead, B Meadows, G Meier, D Melnychuk, S Meloni, M Merk, A Merli, L Meyer Garcia, M Mikhasenko, DA Milanes, E Millard, M Milovanovic, M-N Minard, A Minotti, SE Mitchell, B Mitreska, DS Mitzel, A Mödden, RA Mohammed, RD Moise, S Mokhnenko, T Mombächer, IA Monroy, S Monteil, M Morandin, G Morello, MJ Morello, J Moron, AB Morris, AG Morris, R Mountain, H Mu, F Muheim, M Mulder, K Müller, CH Murphy, D Murray, R Murta, P Muzzetto, P Naik, T Nakada, R Nandakumar, T Nanut, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, P Neustroev, R Newcombe, EM Niel, S Nieswand, N Nikitin, NS Nolte, C Normand, C Nunez, A Oblakowska-Mucha, V Obraztsov, T Oeser, DP O’Hanlon, S Okamura, R Oldeman, F Oliva, ME Olivares, 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, Y Pan, G Panshin, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, W Parker, C Parkes, B Passalacqua, G Passaleva, A Pastore, M Patel, C Patrignani, CJ Pawley, A Pearce, A Pellegrino, M Pepe Altarelli, S Perazzini, D Pereima, A Pereiro Castro, P Perret, M Petric, K Petridis, A Petrolini, A Petrov, S Petrucci, M Petruzzo, H Pham, A Philippov, R Piandani, L Pica, M Piccini, B Pietrzyk, G Pietrzyk, M Pili, D Pinci, F Pisani, M Pizzichemi, V Placinta, J Plews, M Plo Casasus, F Polci, M Poli Lener, M Poliakova, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, S Ponce, D Popov, S 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, NV Raab, RI Rabadan Trejo, B Rachwal, JH Rademacker, R Rajagopalan, M Rama, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Rebollo De Miguel, M Reboud, F Redi, F Reiss, C Remon Alepuz, Z Ren, V Renaudin, PK Resmi, R Ribatti, AM Ricci, S Ricciardi, K Rinnert, P Robbe, G Robertson, AB Rodrigues, E Rodrigues, JA Rodriguez Lopez, E Rodriguez Rodriguez, A Rollings, P Roloff, V Romanovskiy, M Romero Lamas, A Romero Vidal, JD Roth, M Rotondo, MS Rudolph, T Ruf, RA Ruiz Fernandez, J Ruiz Vidal, A Ryzhikov, J Ryzka, JJ Saborido Silva, N Sagidova, N Sahoo, B Saitta, M Salomoni, C Sanchez Gras, I Sanderswood, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, 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, M Schiller, H Schindler, M Schmelling, B Schmidt, S Schmitt, O Schneider, A Schopper, M Schubiger, S Schulte, MH Schune, R Schwemmer, 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, EB Shields, Y Shimizu, E Shmanin, JD Shupperd, BG Siddi, R Silva Coutinho, G Simi, S Simone, M Singla, N Skidmore, R Skuza, T Skwarnicki, MW Slater, I Slazyk, JC Smallwood, JG Smeaton, E Smith, M Smith, A Snoch, L Soares Lavra, MD Sokoloff, FJP Soler, A Solomin, A Solovev, I Solovyev, FL Souza De Almeida, B Souza De Paula, B Spaan, E Spadaro Norella, E Spiridenkov, P Spradlin, V Sriskaran, F Stagni, M Stahl, S Stahl, S Stanislaus, O Steinkamp, O Stenyakin, H Stevens, S Stone, D Strekalina, F Suljik, J Sun, L Sun, Y Sun, P Svihra, PN Swallow, K Swientek, A Szabelski, T Szumlak, M Szymanski, S Taneja, AR Tanner, MD Tat, A Terentev, F Teubert, E Thomas, DJD Thompson, KA Thomson, H Tilquin, V Tisserand, S T’Jampens, M Tobin, L Tomassetti, G Tonani, X Tong, D Torres Machado, DY Tou, E Trifonova, SM Trilov, C Trippl, G Tuci, A Tully, N Tuning, A Ukleja, DJ Unverzagt, E Ursov, A Usachov, A Ustyuzhanin, U Uwer, A Vagner, V Vagnoni, A Valassi, G Valenti, N Valls Canudas, M van Beuzekom, M Van Dijk, H Van Hecke, E van Herwijnen, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, JJ Velthuis, M Veltri, A Venkateswaran, M Veronesi, M Vesterinen, D Vieira, M Vieites Diaz, X Vilasis-Cardona, E Vilella Figueras, A Villa, P Vincent, FC Volle, D vom Bruch, A Vorobyev, V Vorobyev, N Voropaev, K Vos, R Waldi, J Walsh, C Wang, J Wang, J Wang, J Wang, J Wang, M Wang, R Wang, Y Wang, Z Wang, Z Wang, Z Wang, JA Ward, NK Watson, D Websdale, C Weisser, BDC Westhenry, DJ White, M Whitehead, AR Wiederhold, D Wiedner, G Wilkinson, MK Wilkinson, I Williams, M Williams, MRJ Williams, FF Wilson, W Wislicki, M Witek, L Witola, CP Wong, G Wormser, SA Wotton, H Wu, K Wyllie, Z Xiang, D Xiao, Y Xie, A Xu, J Xu, L Xu, M Xu, Q Xu, Z Xu, Z Xu, D Yang, S Yang, Y Yang, Z Yang, Z Yang, Y Yao, LE Yeomans, H Yin, J Yu, X Yuan, E Zaffaroni, M Zavertyaev, M Zdybal, O Zenaiev, M Zeng, D Zhang, L Zhang, S Zhang, S Zhang, Y Zhang, Y Zhang, A Zharkova, A Zhelezov, Y Zheng, T Zhou, X Zhou, Y Zhou, V Zhovkovska, X Zhu, X Zhu, Z Zhu, V Zhukov, Q Zou, S Zucchelli, D Zuliani, G Zunica
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Study of CP violation in B 0 → DK ⋆ (892) 0 decays with D → Kπ ( ππ ), ππ ( ππ ), and KK final states

Journal of High Energy Physics Springer 2024:5 (2024) 25

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:

A measurement of CP-violating observables associated with the interference of B0→ D0K⋆(892)0 and B0→D¯0K⋆8920 decay amplitudes is performed in the D0→ K∓π±(π+π−), D0→ π+π−(π+π−), and D0→ K+K− final states using data collected by the LHCb experiment corresponding to an integrated luminosity of 9 fb−1. CP-violating observables related to the interference of Bs0→D0K¯⋆8920 and Bs0→D¯0K¯⋆8920 are also measured, but no evidence for interference is found. The B0 observables are used to constrain the parameter space of the CKM angle γ and the hadronic parameters rB0DK⋆ and δB0DK⋆ with inputs from other measurements. In a combined analysis, these measurements allow for four solutions in the parameter space, only one of which is consistent with the world average.
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Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at sNN=5.02TeV with the LHCb detector

Physical Review C American Physical Society (APS) 109:5 (2024) 054908

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, 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 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Observation of the B c + → J / ψ π + π 0 decay

Journal of High Energy Physics Springer 2024:4 (2024) 151

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 first observation of the Bc+→J/ψπ+π0 decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the Bc+→J/ψπ+ channel is measured to beBBc+→J/ψπ+π0BBc+→J/ψπ+=2.80±0.15±0.11±0.16, where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for B+ → J/ψK*+ and Bc+→J/ψπ+ decays, which are used to determine the π0 detection efficiency. The π+π0 mass spectrum is found to be consistent with the dominance of an intermediate ρ+ contribution in accordance with a model based on QCD factorisation.
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