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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 $B_{c}^{+} \rightarrow D^{0} K^{+}$ decays

(2017)

Authors:

LHCb collaboration, R Aaij, B Adeva, M Adinolfi, Z Ajaltouni, S Akar, J Albrecht, F Alessio, M Alexander, S Ali, 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, P d'Argent, J Arnau Romeu, A Artamonov, M Artuso, E Aslanides, G Auriemma, M Baalouch, I Babuschkin, S Bachmann, JJ Back, A Badalov, C Baesso, S Baker, V Balagura, W Baldini, RJ Barlow, C Barschel, S Barsuk, W Barter, F Baryshnikov, M Baszczyk, V Batozskaya, B Batsukh, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, LJ Bel, V Bellee, N Belloli, K Belous, I Belyaev, E Ben-Haim, G Bencivenni, S Benson, A Berezhnoy, R Bernet, A Bertolin, C Betancourt, F Betti, M-O Bettler, M van Beuzekom, Ia Bezshyiko, S Bifani, P Billoir, T Bird, A Birnkraut, A Bitadze, A Bizzeti, T Blake, F Blanc, J Blouw, S Blusk, V Bocci, T Boettcher, A Bondar, N Bondar, W Bonivento, I Bordyuzhin, A Borgheresi, S Borghi, M Borisyak, M Borsato, F Bossu, M Boubdir, TJV Bowcock, E Bowen, C Bozzi, S Braun, M Britsch, T Britton, J Brodzicka, E Buchanan, C Burr, A Bursche, J Buytaert, S Cadeddu, R Calabrese, M Calvi, M Calvo Gomez, A Camboni, P Campana, DH Campora Perez, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, P Carniti, L Carson, K Carvalho Akiba, G Casse, L Cassina, L Castillo Garcia, M Cattaneo, G Cavallero, R Cenci, D Chamont, M Charles, Ph Charpentier, G Chatzikonstantinidis, M Chefdeville, S Chen, S-F Cheung, V Chobanova, M Chrzaszcz, X Cid Vidal, G Ciezarek, PEL Clarke, M Clemencic, HV Cliff, J Closier, V Coco, J Cogan, E Cogneras, V Cogoni, L Cojocariu, G Collazuol, P Collins, A Comerma-Montells, A Contu, A Cook, G Coombs, S Coquereau, G Corti, M Corvo, CM Costa Sobral, B Couturier, GA Cowan, DC Craik, A Crocombe, M Cruz Torres, S Cunliffe, R Currie, C D'Ambrosio, F Da Cunha Marinho, E Dall'Occo, J Dalseno, PNY David, A Davis, K De Bruyn, S De Capua, M De Cian, JM De Miranda, L De Paula, M De Serio, P De Simone, CT Dean, D Decamp, M Deckenhoff, L Del Buono, M Demmer, A Dendek, D Derkach, O Deschamps, F Dettori, B Dey, A Di Canto, H Dijkstra, F Dordei, M Dorigo, A Dosil Suárez, A Dovbnya, K Dreimanis, L Dufour, G Dujany, K Dungs, P Durante, R Dzhelyadin, A Dziurda, A Dzyuba, N Déléage, S Easo, M Ebert, U Egede, V Egorychev, S Eidelman, S Eisenhardt, U Eitschberger, R Ekelhof, L Eklund, S Ely, S Esen, HM Evans, T Evans, A Falabella, N Farley, S Farry, R Fay, D Fazzini, D Ferguson, A Fernandez Prieto, F Ferrari, F Ferreira Rodrigues, M Ferro-Luzzi, S Filippov, RA Fini, M Fiore, M Fiorini, M Firlej, C Fitzpatrick, T Fiutowski, F Fleuret, K Fohl, M Fontana, F Fontanelli, DC Forshaw, R Forty, V Franco Lima, M Frank, C Frei, J Fu, W Funk, E Furfaro, C Färber, A Gallas Torreira, D Galli, S Gallorini, S Gambetta, M Gandelman, P Gandini, Y Gao, LM Garcia Martin, J García Pardiñas, J Garra Tico, L Garrido, PJ Garsed, D Gascon, C Gaspar, L Gavardi, G Gazzoni, D Gerick, E Gersabeck, M Gersabeck, T Gershon, Ph Ghez, S Gianì, V Gibson, OG Girard, L Giubega, K Gizdov, VV Gligorov, D Golubkov, A Golutvin, A Gomes, IV Gorelov, C Gotti, R Graciani Diaz, LA Granado Cardoso, E Graugés, E Graverini, G Graziani, A Grecu, P Griffith, L Grillo, BR Gruberg Cazon, O Grünberg, E Gushchin, Yu Guz, T Gys, C Göbel, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, SC Haines, B Hamilton, X Han, S Hansmann-Menzemer, N Harnew, ST Harnew, J Harrison, M Hatch, J He, T Head, A Heister, K Hennessy, P Henrard, L Henry, E van Herwijnen, M Heß, A Hicheur, D Hill, C Hombach, H Hopchev, W Hulsbergen, T Humair, M Hushchyn, D Hutchcroft, M Idzik, P Ilten, R Jacobsson, A Jaeger, J Jalocha, E Jans, A Jawahery, F Jiang, M John, D Johnson, CR Jones, C Joram, B Jost, N Jurik, S Kandybei, M Karacson, JM Kariuki, S Karodia, M Kecke, M Kelsey, M Kenzie, T Ketel, E Khairullin, B Khanji, C Khurewathanakul, T Kirn, S Klaver, K Klimaszewski, S Koliiev, M Kolpin, I Komarov, RF Koopman, P Koppenburg, A Kosmyntseva, A Kozachuk, M Kozeiha, L Kravchuk, K Kreplin, M Kreps, P Krokovny, F Kruse, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, AK Kuonen, K Kurek, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, G Lanfranchi, C Langenbruch, T Latham, C Lazzeroni, R Le Gac, J van Leerdam, A Leflat, J Lefrançois, R Lefèvre, F Lemaitre, E Lemos Cid, O Leroy, T Lesiak, B Leverington, T Li, Y Li, T Likhomanenko, R Lindner, C Linn, F Lionetto, X Liu, D Loh, I Longstaff, JH Lopes, D Lucchesi, M Lucio Martinez, H Luo, A Lupato, E Luppi, O Lupton, A Lusiani, X Lyu, F Machefert, F Maciuc, O Maev, K Maguire, S Malde, A Malinin, T Maltsev, G Manca, G Mancinelli, P Manning, J Maratas, JF Marchand, U Marconi, C Marin Benito, M Marinangeli, P Marino, J Marks, G Martellotti, M Martin, M Martinelli, D Martinez Santos, F Martinez Vidal, D Martins Tostes, LM Massacrier, A Massafferri, R Matev, A Mathad, Z Mathe, C Matteuzzi, A Mauri, E Maurice, B Maurin, A Mazurov, M McCann, A McNab, R McNulty, B Meadows, F Meier, M Meissner, D Melnychuk, M Merk, A Merli, E Michielin, DA Milanes, M-N Minard, DS Mitzel, A Mogini, J Molina Rodriguez, IA Monroy, S Monteil, M Morandin, P Morawski, A Mordà, MJ Morello, O Morgunova, J Moron, AB Morris, R Mountain, F Muheim, M Mulder, M Mussini, D Müller, J Müller, K Müller, V Müller, P Naik, T Nakada, R Nandakumar, A Nandi, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, M Neuner, TD Nguyen, C Nguyen-Mau, S Nieswand, R Niet, N Nikitin, T Nikodem, A Nogay, A Novoselov, DP O'Hanlon, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, R Oldeman, CJG Onderwater, JM Otalora Goicochea, A Otto, P Owen, A Oyanguren, PR Pais, A Palano, M Palutan, A Papanestis, M Pappagallo, LL Pappalardo, W Parker, C Parkes, G Passaleva, A Pastore, GD Patel, M Patel, C Patrignani, A Pearce, A Pellegrino, G Penso, M Pepe Altarelli, S Perazzini, P Perret, L Pescatore, K Petridis, A Petrolini, A Petrov, M Petruzzo, E Picatoste Olloqui, B Pietrzyk, M Pikies, D Pinci, A Pistone, A Piucci, V Placinta, S Playfer, M Plo Casasus, T Poikela, F Polci, A Poluektov, I Polyakov, E Polycarpo, GJ Pomery, A Popov, D Popov, B Popovici, S Poslavskii, C Potterat, E Price, JD Price, J Prisciandaro, A Pritchard, C Prouve, V Pugatch, A Puig Navarro, G Punzi, W Qian, R Quagliani, B Rachwal, JH Rademacker, M Rama, M Ramos Pernas, MS Rangel, I Raniuk, F Ratnikov, G Raven, F Redi, S Reichert, AC dos Reis, C Remon Alepuz, V Renaudin, S Ricciardi, S Richards, M Rihl, K Rinnert, V Rives Molina, P Robbe, AB Rodrigues, E Rodrigues, JA Rodriguez Lopez, P Rodriguez Perez, A Rogozhnikov, S Roiser, A Rollings, V Romanovskiy, A Romero Vidal, JW Ronayne, M Rotondo, MS Rudolph, T Ruf, P Ruiz Valls, JJ Saborido Silva, E Sadykhov, N Sagidova, B Saitta, V Salustino Guimaraes, C Sanchez Mayordomo, B Sanmartin Sedes, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, A Sarti, C Satriano, A Satta, DM Saunders, D Savrina, S Schael, M Schellenberg, M Schiller, H Schindler, M Schlupp, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, K Schubert, M Schubiger, M-H Schune, R Schwemmer, B Sciascia, A Sciubba, A Semennikov, A Sergi, N Serra, J Serrano, L Sestini, P Seyfert, M Shapkin, I Shapoval, Y Shcheglov, T Shears, L Shekhtman, V Shevchenko, BG Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, S Simone, M Sirendi, N Skidmore, T Skwarnicki, E Smith, IT Smith, J Smith, M Smith, H Snoek, L Soares Lavra, MD Sokoloff, FJP Soler, B Souza De Paula, B Spaan, P Spradlin, S Sridharan, F Stagni, M Stahl, S Stahl, P Stefko, S Stefkova, O Steinkamp, S Stemmle, O Stenyakin, H Stevens, S Stevenson, S Stoica, S Stone, B Storaci, S Stracka, M Straticiuc, U Straumann, L Sun, W Sutcliffe, K Swientek, V Syropoulos, M Szczekowski, T Szumlak, S T'Jampens, A Tayduganov, T Tekampe, G Tellarini, F Teubert, E Thomas, J van Tilburg, MJ Tilley, V Tisserand, M Tobin, S Tolk, L Tomassetti, D Tonelli, S Topp-Joergensen, F Toriello, E Tournefier, S Tourneur, K Trabelsi, M Traill, MT Tran, M Tresch, A Trisovic, A Tsaregorodtsev, P Tsopelas, A Tully, N Tuning, A Ukleja, A Ustyuzhanin, U Uwer, C Vacca, V Vagnoni, A Valassi, S Valat, G Valenti, R Vazquez Gomez, P Vazquez Regueiro, S Vecchi, M van Veghel, JJ Velthuis, M Veltri, G Veneziano, A Venkateswaran, M Vernet, M Vesterinen, JV Viana Barbosa, B Viaud, D Vieira, M Vieites Diaz, H Viemann, X Vilasis-Cardona, M Vitti, V Volkov, A Vollhardt, B Voneki, A Vorobyev, V Vorobyev, C Voß, JA de Vries, C Vázquez Sierra, R Waldi, C Wallace, R Wallace, J Walsh, J Wang, DR Ward, HM Wark, NK Watson, D Websdale, A Weiden, M Whitehead, J Wicht, G Wilkinson, M Wilkinson, M Williams, MP Williams, M Williams, T Williams, FF Wilson, J Wimberley, J Wishahi, W Wislicki, M Witek, G Wormser, SA Wotton, K Wraight, K Wyllie, Y Xie, Z Xing, Z Xu, Z Yang, Y Yao, H Yin, J Yu, X Yuan, O Yushchenko, KA Zarebski, M Zavertyaev, L Zhang, Y Zhang, Y Zhang, A Zhelezov, Y Zheng, X Zhu, V Zhukov, S Zucchelli
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First experimental study of photon polarization in radiative B0s decays.

Physical Review Letters American Physical Society 118:2 (2017) 021801

Authors:

R Aaij, B Adeva, M Adinolfi, Tim Evans, Paolo Gandini, Barak R Gruberg Cazon, Thomas Hadavizadeh, Neville Harnew, Donal R Hill, Pawel G Jalocha, Malcolm JJ John, Nathan P Jurik, Sneha Malde, Anita K Nandi, Alexandra Rollings, Stigg Topp-Joergensen, Guy R Wilkinson

Abstract:

The polarization of photons produced in radiative B_{s}^{0} decays is studied for the first time. The data are recorded by the LHCb experiment in pp collisions corresponding to an integrated luminosity of 3  fb^{-1} at center-of-mass energies of 7 and 8 TeV. A time-dependent analysis of the B_{s}^{0}→ϕγ decay rate is conducted to determine the parameter A^{Δ}, which is related to the ratio of right- over left-handed photon polarization amplitudes in b→sγ transitions. A value of A^{Δ}=-0.98_{-0.52}^{+0.46}_{-0.20}^{+0.23} is measured. This result is consistent with the standard model prediction within 2 standard deviations.
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Measurement of forward tt, W + bb and W + cc production in pp collisions at √s = 8 TeV

Physics Letters B Elsevier 767 (2017) 110-120

Authors:

R Aaij, B Adeva, M Adinolfi, Tim Evans, Paolo Gandini, Barak R Gruberg Cazon, Thomas Hadavizadeh, Neville Harnew, Donal Hill, Pawel G Jalocha, Malcolm JJ John, N Jurik, Sneha Malde, Anita K Nandi, Alexandra Rollings, Stig Topp-Joergensen, Guy Wilkinson

Abstract:

+The production of tt‾, W+bb‾ and W+cc‾ is studied in the forward region of proton–proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98±0.02 fb −1 . The W bosons are reconstructed in the decays W→ℓν, where ℓ denotes muon or electron, while the b and c quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions.
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Measurement of matter–antimatter differences in beauty baryon decays

Nature Physics Nature Publishing Group 13:4 (2017) 391-396

Authors:

R Aaij, B Adeva, M Adinolfi, Tim Evans, Paolo Gandini, Barak R Gruberg Cazon, Thomas Hadavizadeh, Neville Harnew, Donal R Hill, Pawel G Jalocha, Malcolm JJ John, Nathan P Jurik, Sneha Malde, Anita K Nandi, Alexandra Rollings, Stigg Topp-Joergensen, Guy R Wilkinson

Abstract:

Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λ b 0 baryons decaying to pπ - π + π - and pπ - K + K - final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λ b 0 to pπ - π + π - decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector.
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Observation of the decay B0s to φπ+π- and evidence for B0 to φπ+π-

Physical Review D American Physical Society 95 (2017) 012006

Authors:

Neville Harnew, Tim Evans, Paolo Gandini, Barak R Gruberg Cazon, Thomas Hadavizadeh, Donal Hill, Pawel G Jalocha, Malcolm JJ John, Oliver Lupton, Sneha Malde, Anita K Nandi, Stig Topp-Joergenson, Guy R Wilkinson

Abstract:

The first observation of the rare decay B0s to φπ+π- and evidence for B0 to φπ+π- are reported, using pp collision data recorded by the LHCb detector at centre-of-mass energies √s = 7 and 8 TeV, corresponding to an integrated luminosity of 3fb^-1. The branching fractions in the π+π- invariant mass range 400 < m(π+π-) < 1600 MeV/c2 are [3.48 ± 0.23 ± 0.17 ± 0.35] X 10^-6 and [1.82 ± 0.25 ± 0.41 ± 0.14] X 10^-7 for B0s to φπ+π- and B0 to φπ+π- respectively, where the uncertainties are statistical, systematic and from the normalisation mode B0s to φπ+π-. A combined analysis of the π+π- mass spectrum and the decay angles of the final-state particles identifies the exclusive decays B0s to φf0(980), B0s to φf2(1270), and B0s →ϕρ0 with branching fractions of [1.12 ± 0.16^+0.09-0.08 ± 0.11] X 10^-6, [0.61 ± 0.13^+0.12-0.05 ± 0.06] X 10^-6 and [2.7 ± 0.7 ± 0.2 ± 0.2] X 10^-7, respectively.
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