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

Guy Wilkinson

Professor of Physics

Sub department

  • Particle Physics

Research groups

  • LHCb
Guy.Wilkinson@physics.ox.ac.uk
Telephone: 01865 (2)83110
Denys Wilkinson Building, room 608a
  • About
  • Publications

Measurement of forward W and Z boson production in association with jets in proton-proton collisions at √s = 8 TeV

Journal of High Energy Physics Springer 2016:131 (2016)

Authors:

Shu-Faye Cheung, Tim Evans, Paolo Gandini, Barak R Gruberg Cadzon, Thomas Hadavizadeh, Neville Harnew, Donal Hill, Pawel G Jalocha, Malcolm John, Oliver J Lupton, Sneha S Malde, Anita K Nandi, Stig Topp-Jorgenson, Guy R Wilkinson

Abstract:

The production of W and Z bosons in association with jets 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 boson is identified using its decay to a muon and a neutrino, while the Z boson is identified through its decay to a muon pair. Total cross-sections are measured and combined into charge ratios, asymmetries, and ratios of W +jet and Z+jet production cross-sections. Differential measurements are also performed as a function of both boson and jet kinematic variables. All results are in agreement with Standard Model predictions.
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Measurement of the B0s→D(*)+sD(*)− branching fractions

Physical Review D American Physical Society 93:9 (2016) 092008

Authors:

Shu-Faye Cheung, Tim Evans, Paolo Gandini, Thomas Hadavizadeh, Neville Harnew, Donal Hill, Pawel G Jalocha, Malcolm John, Oliver J Lupton, Sneha S Malde, Anita K Nandi, Stig Topp-Jorgenson, Guy R Wilkinson

Abstract:

The branching fraction of the decay Bs0 → Ds(∗)+ Ds(∗)- is measured using pp collision data corresponding to an integrated luminosity of 1.0 fb^-1, collected using the LHCb detector at a center-of-mass energy of 7 TeV. It is found to be B(Bs0 → Ds(∗)+ Ds(∗)-) = (3.05 ± 0.10 ± 0.20 ± 0.34)%, where the uncertainties are statistical, systematic, and due to the normalization channel, respectively. The branching fractions of the individual decays corresponding to the presence of one or two Ds∗± are also measured. The individual branching fractions are found to be B(Bs0 → Ds∗± Ds∓) = (1.35 ± 0.06 ± 0.09 ± 0.15)%, B(Bs0 → Ds∗+ Ds∗-) = (1.27 ± 0.08 ± 0.10 ± 0.14)%. All three results are the most precise determinations to date.
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Measurement of the Bs0→Ds(*)+Ds(*)- branching fractions

Physical Review D American Physical Society (APS) 93:9 (2016) 092008

Authors:

R Aaij, C Abellán Beteta, B Adeva, M Adinolfi, A Affolder, 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, O Aquines Gutierrez, F Archilli, P d’Argent, A Artamonov, M Artuso, E Aslanides, G Auriemma, M Baalouch, S Bachmann, JJ Back, A Badalov, C Baesso, W Baldini, RJ Barlow, C Barschel, S Barsuk, W Barter, V Batozskaya, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, LJ Bel, V Bellee, N Belloli, I Belyaev, E Ben-Haim, G Bencivenni, S Benson, J Benton, A Berezhnoy, R Bernet, A Bertolin, M-O Bettler, M van Beuzekom, S Bifani, P Billoir, T Bird, A Birnkraut, A Bizzeti, T Blake, F Blanc, J Blouw, S Blusk, V Bocci, A Bondar, N Bondar, W Bonivento, S Borghi, M Borisyak, M Borsato, TJV Bowcock, E Bowen, C Bozzi, S Braun, M Britsch, T Britton, J Brodzicka, NH Brook, E Buchanan, C Burr, A Bursche, J Buytaert, S Cadeddu, R Calabrese, M Calvi, M Calvo Gomez, P Campana, D 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, Ch Cauet, G Cavallero, R Cenci, M Charles, Ph Charpentier, M Chefdeville, S Chen, S-F Cheung, N Chiapolini, 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, M Coombes, S Coquereau, G Corti, M Corvo, B Couturier, GA Cowan, DC Craik, A Crocombe, M Cruz Torres, S Cunliffe, R Currie, C D’Ambrosio, E Dall’Occo, J Dalseno, PNY David, A Davis, O De Aguiar Francisco, K De Bruyn, S De Capua, M De Cian, JM De Miranda, L De Paula, P De Simone, C-T Dean, D Decamp, M Deckenhoff, L Del Buono, N Déléage, M Demmer, D Derkach, O Deschamps, F Dettori, B Dey, A Di Canto, F Di Ruscio, H Dijkstra, S Donleavy, 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, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, U Eitschberger, R Ekelhof, L Eklund, I El Rifai, Ch Elsasser, S Ely, S Esen, HM Evans, T Evans, A Falabella, C Färber, N Farley, S Farry, R Fay, D Ferguson, V Fernandez Albor, F Ferrari, F Ferreira Rodrigues, M Ferro-Luzzi, S Filippov, M Fiore, M Fiorini, M Firlej, C Fitzpatrick, T Fiutowski, F Fleuret, K Fohl, P Fol, M Fontana, F Fontanelli, DC Forshaw, R Forty, M Frank, C Frei, M Frosini, J Fu, E Furfaro, A Gallas Torreira, D Galli, S Gallorini, S Gambetta, M Gandelman, P Gandini, Y Gao, J García Pardiñas, J Garra Tico, L Garrido, D Gascon, C Gaspar, R Gauld, L Gavardi, G Gazzoni, D Gerick, E Gersabeck, M Gersabeck, T Gershon, Ph Ghez, S Gianì, V Gibson, OG Girard, L Giubega, VV Gligorov, C Göbel, D Golubkov, A Golutvin, A Gomes, C Gotti, M Grabalosa Gándara, R Graciani Diaz, LA Granado Cardoso, E Graugés, E Graverini, G Graziani, A Grecu, E Greening, P Griffith, L Grillo, O Grünberg, B Gui, E Gushchin, Yu Guz, T Gys, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, SC Haines, S Hall, B Hamilton, X Han, S Hansmann-Menzemer, N Harnew, ST Harnew, J Harrison, J He, T Head, V Heijne, A Heister, K Hennessy, P Henrard, L Henry, JA Hernando Morata, E van Herwijnen, M Heß, A Hicheur, D Hill, M Hoballah, C Hombach, W Hulsbergen, T Humair, M Hushchyn, N Hussain, D Hutchcroft, D Hynds, M Idzik, P Ilten, R Jacobsson, A Jaeger, J Jalocha, E Jans, A Jawahery, M John, D Johnson, CR Jones, C Joram, B Jost, N Jurik, S Kandybei, W Kanso, M Karacson, TM Karbach, S Karodia, M Kecke, M Kelsey, IR Kenyon, M Kenzie, T Ketel, E Khairullin, B Khanji, C Khurewathanakul, T Kirn, S Klaver, K Klimaszewski, O Kochebina, M Kolpin, I Komarov, RF Koopman, P Koppenburg, 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, D Lambert, G Lanfranchi, C Langenbruch, B Langhans, T Latham, C Lazzeroni, R Le Gac, J van Leerdam, J-P Lees, R Lefèvre, A Leflat, J Lefrançois, E Lemos Cid, O Leroy, T Lesiak, B Leverington, Y Li, T Likhomanenko, M Liles, R Lindner, C Linn, F Lionetto, B Liu, X Liu, D Loh, I Longstaff, JH Lopes, D Lucchesi, M Lucio Martinez, H Luo, A Lupato, E Luppi, O Lupton, N Lusardi, A Lusiani, F Machefert, F Maciuc, O Maev, K Maguire, S Malde, A Malinin, G Manca, G Mancinelli, P Manning, A Mapelli, J Maratas, JF Marchand, U Marconi, C Marin Benito, 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, B Maurin, A Mazurov, M McCann, J McCarthy, A McNab, R McNulty, B Meadows, F Meier, M Meissner, D Melnychuk, M Merk, E Michielin, DA Milanes, M-N Minard, DS Mitzel, J Molina Rodriguez, IA Monroy, S Monteil, M Morandin, P Morawski, A Mordà, MJ Morello, J Moron, AB Morris, R Mountain, F Muheim, D Müller, J Müller, K Müller, V Müller, M Mussini, B Muster, P Naik, T Nakada, R Nandakumar, A Nandi, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, M Neuner, AD Nguyen, TD Nguyen, C Nguyen-Mau, V Niess, R Niet, N Nikitin, T Nikodem, A Novoselov, DP O’Hanlon, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, O Okhrimenko, R Oldeman, CJG Onderwater, B Osorio Rodrigues, JM Otalora Goicochea, A Otto, P Owen, A Oyanguren, A Palano, F Palombo, M Palutan, J Panman, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, W Parker, C Parkes, G Passaleva, 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, M Petruzzo, E Picatoste Olloqui, B Pietrzyk, M Pikies, D Pinci, A Pistone, A Piucci, S Playfer, M Plo Casasus, T Poikela, F Polci, A Poluektov, I Polyakov, E Polycarpo, A Popov, D Popov, B Popovici, 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, N Rauschmayr, G Raven, F Redi, S Reichert, AC dos Reis, 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, S Roiser, V Romanovsky, A Romero Vidal, JW Ronayne, M Rotondo, T Ruf, P Ruiz Valls, JJ Saborido Silva, 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 Schiller, H Schindler, M Schlupp, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, 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, A Shires, BG Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, M Sirendi, N Skidmore, T Skwarnicki, E Smith, E Smith, IT Smith, J Smith, M Smith, H Snoek, MD Sokoloff, FJP Soler, F Soomro, D Souza, B Souza De Paula, B Spaan, P Spradlin, S Sridharan, F Stagni, M Stahl, S Stahl, S Stefkova, O Steinkamp, O Stenyakin, S Stevenson, S Stoica, S Stone, B Storaci, S Stracka, M Straticiuc, U Straumann, L Sun, W Sutcliffe, K Swientek, S Swientek, V Syropoulos, M Szczekowski, T Szumlak, S T’Jampens, A Tayduganov, T Tekampe, G Tellarini, F Teubert, C Thomas, E Thomas, J van Tilburg, V Tisserand, M Tobin, J Todd, S Tolk, L Tomassetti, D Tonelli, S Topp-Joergensen, N Torr, E Tournefier, S Tourneur, K Trabelsi, M Traill, MT Tran, M Tresch, A Trisovic, A Tsaregorodtsev, P Tsopelas, N Tuning, A Ukleja, A Ustyuzhanin, U Uwer, C Vacca, V Vagnoni, G Valenti, A Vallier, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, M van Veghel, JJ Velthuis, M Veltri, G Veneziano, M Vesterinen, B Viaud, D Vieira, M Vieites Diaz, X Vilasis-Cardona, V Volkov, A Vollhardt, D Voong, A Vorobyev, V Vorobyev, C Voß, JA de Vries, R Waldi, C Wallace, R Wallace, J Walsh, J Wang, DR Ward, 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, S Wright, K Wyllie, Y Xie, Z Xu, Z Yang, J Yu, X Yuan, O Yushchenko, M Zangoli, M Zavertyaev, L Zhang, Y Zhang, A Zhelezov, A Zhokhov, L Zhong, V Zhukov, S Zucchelli
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Measurement of the properties of the Ξ∗0b baryon

Journal of High Energy Physics Springer 2016:5 (2016) 161

Authors:

Neville Harnew, Shu-Faye Cheung, Tim Evans, Paolo Gandini, Thomas Hadavizadeh, Donal Hill, Pawel G Jalocha, Malcolm John, Oliver J Lupton, Sneha S Malde, Anita K Nandi, Stig Topp-Jorgenson, Guy R Wilkinson

Abstract:

We perform a search for near-threshold Ξb0 resonances decaying to Ξb−π+ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected by the LHCb experiment. We observe one resonant state, with the following properties: m(Ξ∗0b) − m(Ξ−b) − m(π+) = 15.727 ± 0.068(stat) ± 0.023(syst) MeV/c2 Γ(Ξ∗0b) = 0.90 ± 0.16(stat) ± 0.08(syst) MeV. This confirms the previous observation by the CMS collaboration. The state is consistent with the JP = 3/2+  Ξb∗ 0 resonance expected in the quark model. This is the most precise determination of the mass and the first measurement of the natural width of this state. We have also measured the ratio σ(pp→Ξ∗0bX)B(Ξ∗0b→Ξ−bπ+)/σ(pp → Ξ−bX) =0.28 ± 0.03(stat.) ± 0.01(syst.).
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Observation of the Λ0b → Λφ decay

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics Elsevier 759 (2016) 282-292

Authors:

Shu-Faye Cheung, Tim Evans, Paolo Gandini, Barak R Gruberg Cadzon, Thomas Hadavizadeh, Neville Harnew, Donal Hill, Pawel G Jalocha, Malcolm John, Oliver J Lupton, Sneha S Malde, Anita K Nandi, Stig Topp-Jorgenson, Guy R Wilkinson

Abstract:

The Λ0b → Λφ decay is observed using data corresponding to an integrated luminosity of 3.0 fb^-1 recorded by the LHCb experiment. The decay proceeds at leading order via a b → sss loop transition and is therefore sensitive to the possible presence of particles beyond the Standard Model. A first observation is reported with a significance of 5.9 standard deviations. The value of the branching fraction is measured to be (5.18 ± 1.04 ± 0.35^+0.67-0.62) X 10^-6, where the first uncertainty is statistical, the second is systematic, and the third is related to external inputs. Triple-product asymmetries are measured to be consistent with zero.
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