Amplitude analysis of $B^{-} \to D^{+} \pi^{-} \pi^{-}$ decays

(2016)

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, O Aquines Gutierrez, 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, W Baldini, RJ Barlow, C Barschel, S Barsuk, W Barter, 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, J Benton, A Berezhnoy, R Bernet, A Bertolin, F Betti, M-O Bettler, M van Beuzekom, I 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, 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, D Campora Perez, 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, Ch Cauet, G Cavallero, R Cenci, 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, 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, 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, M De Serio, P De Simone, C-T Dean, D Decamp, M Deckenhoff, L Del Buono, M Demmer, 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, Ch Elsasser, S Ely, S Esen, HM Evans, T Evans, A Falabella, N Farley, S Farry, R Fay, D Fazzini, D Ferguson, V Fernandez Albor, 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, 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 Gianí, V Gibson, OG Girard, L Giubega, K Gizdov, VV Gligorov, D Golubkov, A Golutvin, A Gomes, IV Gorelov, C Gotti, M Grabalosa Gándara, 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, S Hall, 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, JA Hernando Morata, E van Herwijnen, M Heß, A Hicheur, D Hill, C Hombach, W Hulsbergen, T Humair, M Hushchyn, N Hussain, 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, W Kanso, M Karacson, JM Kariuki, S Karodia, M Kecke, M Kelsey, IR Kenyon, 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 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, D Lambert, G Lanfranchi, C Langenbruch, T Latham, C Lazzeroni, R Le Gac, J van Leerdam, J-P Lees, A Leflat, J Lefrançois, R Lefèvre, F Lemaitre, E Lemos Cid, O Leroy, T Lesiak, B Leverington, Y Li, T Likhomanenko, 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, 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, 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, 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, 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, AD Nguyen, C Nguyen-Mau, S Nieswand, R Niet, N Nikitin, T Nikodem, 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, F Palombo, M Palutan, J Panman, 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, 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, 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, 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, A Shires, 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, MD Sokoloff, FJP Soler, D Souza, 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, 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, C Thomas, 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, S Valat, G Valenti, A Vallier, R Vazquez Gomez, P Vazquez Regueiro, S Vecchi, M van Veghel, JJ Velthuis, M Veltri, G Veneziano, A Venkateswaran, M Vernet, M Vesterinen, B Viaud, D Vieira, M Vieites Diaz, X Vilasis-Cardona, V Volkov, A Vollhardt, B Voneki, D Voong, 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, S Wright, K Wyllie, Y Xie, Z Xing, Z Xu, Z Yang, H Yin, J Yu, X Yuan, O Yushchenko, M Zangoli, KA Zarebski, M Zavertyaev, L Zhang, Y Zhang, Y Zhang, A Zhelezov, Y Zheng, A Zhokhov, X Zhu, V Zhukov, S Zucchelli

Measurement of the CP asymmetry in B0s - B-0s mixing.

Physical Review Letters American Physics Society 117:6 (2016) 061803

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 CP asymmetry in the mixing of B0s and B¯0s mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−1, recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV. Semileptonic B0s and B¯0s decays are studied in the inclusive mode D∓s μ± ν-μX with the D∓s mesons reconstructed in the K+K−π∓ final state. Correcting the observed charge asymmetry for detection and background effects, the CP asymmetry is found to be assl=(0.39 ± 0.26 ± 0.20)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of assl to date. It is consistent with the prediction from the standard model and will constrain new models of particle physics.

Model-independent evidence for J/ψp contributions to Λb0 → J/ψpK- decays.

Physical Review Letters American Physical Society 117:8 (2016) 082002

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 data sample of Λb0 → J/ψpK- decays acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity of 3  fb^-1, is inspected for the presence of J/ψp or J/ψK- contributions with minimal assumptions about K-p contributions. It is demonstrated at more than nine standard deviations that Λ0b → J/ψpK- decays cannot be described with K-p contributions alone, and that J/ψp contributions play a dominant role in this incompatibility. These model-independent results support the previously obtained model-dependent evidence for P+c → J/ψp charmonium-pentaquark states in the same data sample.

Production of associated Y and open charm hadrons in pp collisions at √s=7 and 8 TeV via double parton scattering

Journal of High Energy Physics Springer Verlag 2016:52 (2016) 1-35

Authors:

SF Cheung, T Evans, P Gandini, R Gauld, E Greening, T Hadavizadeh, N Harnew, D Hill, N Hussain, J Jalocha, M John, N Harnew, O Lupton, S Malde, A Nandi, E Smith, S Stevenson, C Thomas, S Topp-Joergensen, N Torr, G Wilkinson, N Harnew

Abstract:

Associated production of bottomonia and open charm hadrons in pp collisions at s=7 and 8 TeV is observed using data corresponding to an integrated luminosity of 3 fb−1 accumulated with the LHCb detector. The observation of five combinations, Y(1S)D0, Y(2S)D0, Y(1S)D+, Y(2S)D+ and Y(1S)Ds+, is reported. Production crosssections are measured for Y(1S)D0 and Y(1S)D+ pairs in the forward region. The measured cross-sections and the differential distributions indicate the dominance of double parton scattering as the main production mechanism.

The TORCH time-of-flight detector

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 824 (2016) 106-110

Authors:

N Harnew, N Brook, L Castillo García, D Cussans, K Föhl, R Forty, C Frei, R Gao, T Gys, D Piedigrossi, J Rademacker, A Ros Garcia, M Van Dijk

Abstract:

© 2015 The Authors. The TORCH time-of-flight detector is being developed to provide particle identification between 2 and 10 GeV/c momentum over a flight distance of 10 m. TORCH is designed for large-area coverage, up to 30 m2, and has a DIRC-like construction. The goal is to achieve a 15 ps time-of-flight resolution per incident particle by combining arrival times from multiple Cherenkov photons produced within quartz radiator plates of 10 mm thickness. A four-year R&D programme is underway with an industrial partner (Photek, UK) to produce 53×53 mm2 Micro-Channel Plate (MCP) detectors for the TORCH application. The MCP-PMT will provide a timing accuracy of 40 ps per photon and it will have a lifetime of up to at least 5 Ccm-2 of integrated anode charge by utilizing an Atomic Layer Deposition (ALD) coating. The MCP will be read out using charge division with customised electronics incorporating the NINO chipset. Laboratory results on prototype MCPs are presented. The construction of a prototype TORCH module and its simulated performance are also described.