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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

Observation of two resonances in the Λ_{b}^{0}π^{±} systems and precise measurement of Σ_{b}^{±} and Σ_{b}^{*±} properties

Physical Review Letters American Physical Society 122:1 (2019) 012001

Authors:

R Aaij, C Abellán Beteta, B Adeva, M Adinolfi, CA Aidala, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, S Amerio, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, JE Andrews, RB Appleby, F Archilli, J Arnau Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, JJ Back, STEPHEN Baker, V Balagura, W Baldini, A Baranov, RJ Barlow, S Barsuk, W Barter, F Baryshnikov, V Batozskaya, B Batsukh, V Battista, A Bay, J Beddow, F Bedeschi, I Bediaga, A Beiter

Abstract:

The first observation of two structures consistent with resonances in the final states Λ_{b}^{0}π^{-} and Λ_{b}^{0}π^{+} is reported using samples of pp collision data collected by the LHCb experiment at sqrt[s]=7 and 8 TeV, corresponding to an integrated luminosity of 3  fb^{-1}. The ground states Σ_{b}^{±} and Σ_{b}^{*±} are also confirmed and their masses and widths are precisely measured.
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Measurement of the Charm-Mixing Parameter yCP

Physical Review Letters American Physical Society 122:1 (2019) 011802

Authors:

R Aaij, CA Beteta, B Adeva, M Adinolfi, CA Aidala, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, PA Cartelle, AA Alves Jr, S Amato, S Amerio, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, JE Andrews, F Archilli, P D'Argent, JA Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, JJ Back, Stephen Baker, V Balagura, W Baldini, A Baranov, RJ Barlow, GC Barrand, S Barsuk, W Barter, M Bartolini, F Baryshnikov, V Batozskaya, B Batsukh, A Battig, V Battista, A Bay, J Beddow

Abstract:

A measurement of the charm-mixing parameter yCP using D0 → KþK−, D0 → πþπ−, and D0 → K−πþ decays is reported. The D0 mesons are required to originate from semimuonic decays of B− and B0 mesons. These decays are partially reconstructed in a data set of proton-proton collisions at center-of-mass energies of 7 and 8 TeV collected with the LHCb experiment and corresponding to an integrated luminosity of 3 fb−1. The yCP parameter is measured to be ð0.57 0.13ðstatÞ 0.09ðsystÞÞ%, in agreement with, and as precise as, the current world-average value.
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Observation of Two Resonances in the Λb0π± Systems and Precise Measurement of Σb± and Σb*± Properties

PHYSICAL REVIEW LETTERS 122:1 (2019) ARTN 012001

Authors:

R Aaij, C Abellan Beteta, B Adeva, M Adinolfi, CA Aidala, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, AA Alves Jr, S Amato, S Amerio, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, JE Andrews, RB Appleby, F Archilli, J Arnau Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, JJ Back, S Baker, V Balagura, W Baldini, A Baranov, RJ Barlow, S Barsuk, W Barter, F Baryshnikov, V Batozskaya, B Batsukh, V Battista, A Bay, J Beddow, F Bedeschi, I Bediaga, A Beiter, LJ Bel, S Belin, N Beliy, V Bellee, N Belloli, K Belous, I Belyaev, G Bencivenni, E Ben-Haim, S Benson, S Beranek, A Berezhnoy, R Bernet, D Berninghoff, E Bertholet, A Bertolin, C Betancourt, F Betti, MO Bettler, Ia Bezshyiko, S Bhasin, J Bhom, S Bifani, P Billoir, A Birnkraut, A Bizzeti, M Bjorn, MP Blago, T Blake, F Blanc, S Blusk, D Bobulska, V Bocci, O Boente Garcia, T Boettcher, A Bondar, N Bondar, S Borghi, M Borisyak, M Borsato, F Bossu, M Boubdir, TJV Bowcock, C Bozzi, S Braun, M Brodski, J Brodzicka, A Brossa Gonzalo, D Brundu, E Buchanan, A Buonaura, C Burr, A Bursche, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, R Calladine, M Calvi, M Calvo Gomez, A Camboni, P Campana, H Campora Perez, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, P Carniti, L Carson, K Carvalho Akiba, G Casse, L Cassina, M Cattaneo, G Cavallero, R Cenci, D Chamont, G Chapman, M Charles, Ph Charpentier, G Chatzikonstantinidis, M Chefdeville, V Chekalina, C Chen, S Chen, S-G Chitic, V Chobanova, M Chrzaszcz, A Chubykin, P Ciambrone, X Cid Vidal, G Ciezarek, F Cindolo, PEL Clarke, M Clemencic, HV Cliff, J Closier, V Coco, JAB Coelho, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Comerma-Montells, A Contu, G Coombs, S Coquereau, G Corti, M Corvo, CM Costa Sobral, B Couturier, GA Cowan, DC Craik, A Crocombe, M Cruz Torres, R Currie, F Da Cunha Marinho, CL Da Silva, E Dall'Occo, J Dalseno, C D'Ambrosio, A Danilina, P d'Argent, A Davis, O De Aguiar Francisco, K De Bruyn, S De Capua, De Cian, JM De Miranda, L De Paula, M De Serio, P De Simone, JA de Vries, CT Dean, D Decamp, L Del Buono, B Delaney, H-P Dembinski, M Demmer, A Dendek, D Derkach, O Deschamps, F Desse, F Dettori, B Dey, A Di Canto, P Di Nezza, S Didenko, H Dijkstra, F Dordei, M Dorigo, AC dos Reis, A Dosil Suarez, L Douglas, A Dovbnya, K Dreimanis, L Dufour, G Dujany, P Durante, JM Durham, D Dutta, R Dzhelyadin, M Dziewiecki, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, U Eitschberger, R Ekelhof, L Eklund, S Ely, A Ene, S Escher, S Esen, T Evans, A Falabella, C Faerber, N Farley, S Farry, D Fazzini, L Federici, M Feo, P Fernandez Declara, A Fernandez Prieto, F Ferrari, L Ferreira Lopes, F Ferreira Rodrigues, M Ferro-Luzzi, S Filippov, RA Fini, M Fiorini, M Firlej, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, R Forty, V Franco Lima, M Frank, C Frei, J Fu, W Funk, E Gabriel, A Gallas Torreira, D Galli, S Gallorini, S Gambetta, Y Gan, M Gandelman, P Gandini, Y Gao, LM Garcia Martin, J Garcia Pardinas, B Garcia Plana, J Garra Tico, L Garrido, D Gascon, C Gaspar, L Gavardi, G Gazzoni, D Gerick, E Gersabeck, M Gersabeck, T Gershon, D Gerstel, Ph Ghez, S Giani, V Gibson, OG Girard, L Giubega, K Gizdov, VV Gligorov, C Gobel, D Golubkov, A Golutvin, A Gomes, IV Gorelov, C Gotti, E Govorkova, JP Grabowski, R Graciani Diaz, LA Granado Cardoso, E Grauges, E Graverini, G Graziani, A Grecu, R Greim, P Griffith, L Grillo, L Gruber, BR Gruberg Cazon, O Gruenberg, C Gu, E Gushchin, Yu Guz, T Gys, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, SC Haines, B Hamilton, X Han, TH Hancock, S Hansmann-Menzemer, N Harnew, ST Harnew, T Harrison, C Hasse, M Hatch, J He, M Hecker, K Heinicke, A Heister, K Hennessy, L Henry, M Hess, A Hicheur, R Hidalgo Charman, D Hill, M Hilton, PH Hopchev, W Hu, W Huang, ZC Huard, W Hulsbergen, T Humair, M Hushchyn, D Hutchcroft, D Hynds, P Ibis, M Idzik, P Ilten, A Inyakin, K Ivshin, R Jacobsson, J Jalocha, E Jans, BK Jashal, A Jawahery, F Jiang, M John, D Johnson, CR Jones, C Joram, B Jost, N Jurik, S Kandybei, M Karacson, JM Kariuki, S Karodia, N Kazeev, M Kecke, F Keizer, M Kelsey, M Kenzie, T Ketel, E Khairullin, B Khanji, C Khurewathanakul, KE Kim, T Kim, S Klaver, K Klimaszewski, T Klimkovich, S Koliiev, M Kolpin, R Kopecna, P Koppenburg, I Kostiuk, S Kotriakhova, M Kozeiha, L Kravchuk, M Kreps, F Kress, P Krokovny, W Krupa, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, AK Kuonen, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, D Lancierini, G Lanfranchi, C Langenbruch, T Latham, C Lazzeroni, R Le Gac, R Lefevre, A Leflat, J Lefrancois, F Lemaitre, O Leroy, T Lesiak, B Leverington, P-R Li, T Li, Z Li, X Liang, T Likhomanenko, R Lindner, F Lionetto, V Lisovskyi, X Liu, D Loh, A Loi, I Longstaff, JH Lopes, GH Lovell, D Lucchesi, M Lucio Martinez, A Lupato, E Luppi, O Lupton, A Lusiani, X Lyu, F Machefert, F Maciuc, V Macko, P Mackowiak, S Maddrell-Mander, O Maev, K Maguire, D Maisuzenko, MW Majewski, S Malde, B Malecki, A Malinin, T Maltsev, G Manca, G Mancinelli, D Marangotto, J Maratas, JF Marchand, U Marconi, C Marin Benito, M Marinangeli, P Marino, J Marks, PJ Marshall, G Martellotti, M Martin, M Martinelli, D Martinez Santos, F Martinez Vidal, A Massafferri, M Materok, R Matev, A Mathad, Z Mathe, C Matteuzzi, A Mauri, E Maurice, B Maurin, A Mazurov, M McCann, A McNab, R McNulty, JV Mead, B Meadows, C Meaux, F Meier, N Meinert, D Melnychuk, M Merk, A Merli, E Michielin, DA Milanes, E Millard, M-N Minard, L Minzoni, DS Mitzel, A Moedden, A Mogini, J Molina Rodriguez, T Mombaecher, IA Monroy, S Monteil, M Morandin, G Morello, MJ Morello, O Morgunova, J Moron, AB Morris, R Mountain, F Muheim, M Mulder, D Mueller, J Mueller, K Mueller, V Mueller, CH Murphy, D Murray, P Naik, T Nakada, R Nandakumar, A Nandi, T Nanut, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, M Neuner, R Newcombe, TD Nguyen, C Nguyen-Mau, S Nieswand, R Niet, N Nikitin, A Nogay, NS Nolte, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, DP O'Hanlon, R Oldeman, CJG Onderwater, A Ossowska, JM Otalora Goicochea, P Owen, A Oyanguren, PR Pais, T Pajero, A Palano, M Palutan, G Panshin, A Papanestis, M Pappagallo, LL Pappalardo, W Parker, C Parkes, G Passaleva, A Pastore, M Patel, C Patrignani, A Pearce, A Pellegrino, G Penso, M Pepe Altarelli, S Perazzini, D Pereima, P Perret, L Pescatore, K Petridis, A Petrolini, A Petrov, S Petrucci, M Petruzzo, B Pietrzyk, G Pietrzyk, M Pikies, M Pili, D Pinci, J Pinzino, F Pisani, A Piucci, V Placinta, S Playfer, J Plews, M Plo Casasus, F Polci, M Poli Lener, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, GJ Pomery, S Ponce, A Popov, D Popov, S Poslavskii, C Potterat, E Price, J Prisciandaro, C Prouve, V Pugatch, A Puig Navarro, H Pullen, G Punzi, W Qian, J Qin, R Quagliani, B Quintana, NV Raab, B Rachwal, JH Rademacker, M Rama, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Ravonel Salzgeber, M Reboud, F Redi, S Reichert, F Reiss, C Remon Alepuz, Z Ren, V Renaudin, S Ricciardi, S Richards, K Rinnert, P Robbe, A Robert, AB Rodrigues, E Rodrigues, JA Rodriguez Lopez, M Roehrken, S Roiser, A Rollings, V Romanovskiy, A Romero Vidal, M Rotondo, MS Rudolph, T Ruf, J Ruiz Vidal, JJ Saborido Silva, N Sagidova, B Saitta, V Salustino Guimaraes, C Sanchez Gras, C Sanchez Mayordomo, B Sanmartin Sedes, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, G Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, S Schael, M Schellenberg, M Schiller, H Schindler, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, HF Schreiner, M Schubiger, MH Schune, R Schwemmer, B Sciascia, A Sciubba, A Semennikov, ES Sepulveda, A Sergi, N Serra, J Serrano, L Sestini, A Seuthe, P Seyfert, M Shapkin, Y Shcheglov, T Shears, L Shekhtman, V Shevchenko, E Shmanin, BG Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, S Simone, I Skiba, N Skidmore, T Skwarnicki, MW Slater, JG Smeaton, E Smith, IT Smith, M Smith, M Soares, I Soares Lavra, MD Sokoloff, FJP Soler, B Souza De Paula, B Spaan, E Spadaro Norella, P Spradlin, F Stagni, M Stahl, S Stahl, P Stefko, S Stefkova, O Steinkamp, S Stemmle, O Stenyakin, M Stepanova, H Stevens, A Stocchi, S Stone, B Storaci, S Stracka, ME Stramaglia, M Straticiuc, U Straumann, S Strokov, J Sun, L Sun, K Swientek, T Szumlak, M Szymanski, Z Tang, A Tayduganov, T Tekampe, G Tellarini, F Teubert, E Thomas, MJ Tilley, V Tisserand, S T'Jampens, M Tobin, S Tolk, L Tomassetti, D Tonelli, DY Tou, R Tourinho Jadallah Aoude, E Tournefier, M Traill, MT Tran, A Trisovic, A Tsaregorodtsev, G Tuci, A Tully, N Tuning, A Ukleja, A Usachov, A Ustyuzhanin, U Uwer, A Vagner, V Vagnoni, A Valassi, S Valat, G Valenti, M van Beuzekom, E van Herwijnen, J van Tilburg, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, C Vazquez Sierra, S Vecchi, JJ Velthuis, M Veltri, G Veneziano, A Venkateswaran, TA Verlage, M Vernet, M Veronesi, M Vesterinen, JV Viana Barbosa, D Vieira, M Vieites Diaz, H Viemann, X Vilasis-Cardona, A Vitkovskiy, M Vitti, V Volkov, A Vollhardt, D Vom Bruch, B Voneki, A Vorobyev, V Vorobyev, N Voropaev, R Waldi, J Walsh, J Wang, M Wang, Y Wang, Z Wang, DR Ward, HM Wark, NK Watson, D Websdale, A Weiden, C Weisser, M Whitehead, J Wicht, G Wilkinson, M Wilkinson, I Williams, M Williams, MRJ Williams, T Williams, FF Wilson, J Wimberley, M Winn, J Wishahi, W Wislicki, M Witek, G Wormser, SA Wotton, K Wyllie, D Xiao, Y Xie, A Xu, M Xu, Q Xu, Z Xu, Z Yang, Y Yao, LE Yeomans, H Yin, J Yu, X Yuan, O Yushchenko, KA Zarebski, M Zavertyaev, D Zhang, L Zhang, WC Zhang, Y Zhang, A Zhelezov, Y Zheng, X Zhu, V Zhukov, JB Zonneveld, S Zucchelli
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Evidence for an ηc(1S)π−resonance in B0→ηc(1S)K+π−decays

European Physical Journal C SpringerOpen (part of Springer Nature) 78:12 (2018)

Authors:

R Aaij, CA Beteta, B Adeva, Mikkel Bjoern, Barak R Gruberg Cazon, Thomas Hadavizadeh, Thomas H Hancock, Neville Harnew, Donal Hill, Malcolm John, Nathan Jurik, Sneha Malde, Colm Murphy, Martina Pili, Hannah Pullen, Alexandra Rollings, Mika Vesterinen, Guy Wilkinson

Abstract:

A Dalitz plot analysis of B0→ηc(1S)K+π− decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of s√=7, 8 and 13TeV, corresponding to a total integrated luminosity of 4.7 fb −1. A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(1S)π− resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20 +18−22MeV and 152±58 +60−35MeV, respectively. The spin-parity assignments JP=0+ and JP=1− are both consistent with the data. In addition, the first measurement of the B0→ηc(1S)K+π− branching fraction is performed and gives B(B0→ηc(1S)K+π−)=(5.73±0.24±0.13±0.66)×10−4, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.
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Search for lepton-flavour-violating decays of Higgs-like bosons

European Physical Journal C SpringerOpen 78 (2018) 1008

Authors:

R Aaij, CA Beteta, B Adeva, M Adinolfi, CA Aidala, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, PA Cartelle, AAA Jr, S Amato, S Amerio, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, JE Andrews, RB Appleby, F Archilli, P D'Argent, JA Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, JJ Back, Stephen Baker, V Balagura, W Baldini, A Baranov, RJ Barlow, S Barsuk, W Barter, F Baryshnikov, V Batozskaya, B Batsukh, V Battista, A Bay, J Beddow, F Bedeschi, I Bediaga

Abstract:

A search is presented for a Higgs-like boson with mass in the range 45 to 195 GeV/c2 decaying into a muon and a tau lepton. The dataset consists of proton-proton interactions at a centre-of-mass energy of 8 TeV , collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb −1 . The tau leptons are reconstructed in both leptonic and hadronic decay channels. An upper limit on the production cross-section multiplied by the branching fraction at 95% confidence level is set and ranges from 22 pb for a boson mass of 45 GeV/c2 to 4 pb for a mass of 195 GeV/c2 .
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