Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}.
Physical review letters 124:22 (2020) 222001
Authors:
R Aaij, C Abellán Beteta, T Ackernley, B Adeva, M Adinolfi, H Afsharnia, CA Aidala, S Aiola, Z Ajaltouni, S Akar, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, F Archilli, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, JJ Back, S Baker, V Balagura, W Baldini, J Baptista Leite, RJ Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, JM Basels, G Bassi, V Batozskaya, B Batsukh, A Battig, A Bay, M Becker, F Bedeschi, I Bediaga, A Beiter, V Belavin, S Belin, V Bellee, K Belous, I Belyaev, G Bencivenni, E Ben-Haim, S Benson, A Berezhnoy, R Bernet, D Berninghoff, HC Bernstein, C Bertella, E Bertholet, A Bertolin, C Betancourt, F Betti, MO Bettler, Ia Bezshyiko, S Bhasin, J Bhom, MS Bieker, S Bifani, P Billoir, A Bizzeti, M Bjørn, MP Blago, T Blake, F Blanc, S Blusk, D Bobulska, V Bocci, O Boente Garcia, T Boettcher, A Boldyrev, A Bondar, N Bondar, S Borghi, M Borisyak, M Borsato, JT Borsuk, TJV Bowcock, A Boyer, C Bozzi, MJ Bradley, S Braun, A Brea Rodriguez, M Brodski, J Brodzicka, A Brossa Gonzalo, D Brundu, E Buchanan, A Büchler-Germann, A Buonaura, C Burr, A Bursche, A Butkevich, JS Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, L Calero Diaz, S Cali, R Calladine, M Calvi, M Calvo Gomez, P Camargo Magalhaes, A Camboni, P Campana, DH Campora Perez, AF Campoverde Quezada, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, I Carli, P Carniti, K Carvalho Akiba, A Casais Vidal, G Casse, M Cattaneo, G Cavallero, S Celani, R Cenci, J Cerasoli, MG Chapman, M Charles, Ph Charpentier, G Chatzikonstantinidis, M Chefdeville, V Chekalina, C Chen, S Chen, A Chernov, S-G Chitic, V Chobanova, S Cholak, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, MF Cicala, X Cid Vidal, G Ciezarek, F Cindolo, PEL Clarke, M Clemencic, HV Cliff, J Closier, JL Cobbledick, V Coco, JAB Coelho, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Contu, N Cooke, G Coombs, S Coquereau, G Corti, CM Costa Sobral, B Couturier, DC Craik, J Crkovská, A Crocombe, M Cruz Torres, R Currie, 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, M De Cian, JM De Miranda, L De Paula, M De Serio, P De Simone, JA de Vries, CT Dean, W Dean, D Decamp, L Del Buono, B Delaney, H-P Dembinski, A Dendek, V Denysenko, D Derkach, O Deschamps, F Desse, F Dettori, B Dey, A Di Canto, P Di Nezza, S Didenko, H Dijkstra, V Dobishuk, F Dordei, M Dorigo, AC Dos Reis, L Douglas, A Dovbnya, K Dreimanis, MW Dudek, L Dufour, P Durante, JM Durham, D Dutta, M Dziewiecki, 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, A Falabella, J Fan, Y Fan, N Farley, S Farry, D Fazzini, P Fedin, M Féo, P Fernandez Declara, A Fernandez Prieto, 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, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, R Forty, V Franco Lima, M Franco Sevilla, M Frank, C Frei, DA Friday, J Fu, Q Fuehring, W Funk, E Gabriel, T Gaintseva, A Gallas Torreira, D Galli, S Gallorini, S Gambetta, Y Gan, M Gandelman, P Gandini, Y Gao, LM Garcia Martin, J García Pardiñas, B Garcia Plana, FA Garcia Rosales, L Garrido, D Gascon, C Gaspar, D Gerick, E Gersabeck, M Gersabeck, T Gershon, D Gerstel, Ph Ghez, V Gibson, A Gioventù, P Gironella Gironell, L Giubega, C Giugliano, K Gizdov, VV Gligorov, C Göbel, E Golobardes, D Golubkov, A Golutvin, A Gomes, P Gorbounov, IV Gorelov, C Gotti, E Govorkova, JP Grabowski, R Graciani Diaz, T Grammatico, LA Granado Cardoso, E Graugés, E Graverini, G Graziani, A Grecu, R Greim, P Griffith, L Grillo, L Gruber, BR Gruberg Cazon, C Gu, M Guarise, E Gushchin, A Guth, Yu Guz, T Gys, PA Günther, T Hadavizadeh, G Haefeli, C Haen, SC Haines, PM Hamilton, Q Han, X Han, TH Hancock, S Hansmann-Menzemer, N Harnew, T Harrison, R Hart, C Hasse, M Hatch, J He, M Hecker, K Heijhoff, K Heinicke, AM Hennequin, K Hennessy, L Henry, J Heuel, A Hicheur, D Hill, M Hilton, PH Hopchev, J Hu, J Hu, W Hu, W Huang, W Hulsbergen, T Humair, RJ Hunter, M Hushchyn, D Hutchcroft, D Hynds, P Ibis, M Idzik, P Ilten, A Inglessi, K Ivshin, R Jacobsson, S Jakobsen, E Jans, BK Jashal, A Jawahery, V Jevtic, F Jiang, M John, D Johnson, CR Jones, B Jost, N Jurik, S Kandybei, M Karacson, JM Kariuki, N Kazeev, M Kecke, F Keizer, M Kelsey, M Kenzie, T Ketel, B Khanji, A Kharisova, KE Kim, T Kirn, VS Kirsebom, S Klaver, K Klimaszewski, S Koliiev, A Kondybayeva, A Konoplyannikov, P Kopciewicz, R Kopecna, P Koppenburg, M Korolev, I Kostiuk, O Kot, S Kotriakhova, L Kravchuk, RD Krawczyk, M Kreps, F Kress, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, HS Kuindersma, GJ Kunde, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, D Lancierini, JJ Lane, G Lanfranchi, C Langenbruch, O Lantwin, T Latham, F Lazzari, R Le Gac, SH Lee, R Lefèvre, A Leflat, O Leroy, T Lesiak, B Leverington, H Li, L Li, X Li, Y Li, Z Li, X Liang, T Lin, R Lindner, V Lisovskyi, G Liu, X Liu, D Loh, A Loi, J Lomba Castro, I Longstaff, JH Lopes, G Loustau, GH Lovell, Y Lu, D Lucchesi, M Lucio Martinez, Y Luo, A Lupato, E Luppi, O Lupton, A Lusiani, X Lyu, S Maccolini, F Machefert, F Maciuc, V Macko, P Mackowiak, S Maddrell-Mander, LR Madhan Mohan, O Maev, A Maevskiy, D Maisuzenko, MW Majewski, S Malde, B Malecki, A Malinin, T Maltsev, H Malygina, G Manca, G Mancinelli, R Manera Escalero, D Manuzzi, D Marangotto, J Maratas, JF Marchand, U Marconi, S Mariani, C Marin Benito, M Marinangeli, P Marino, J Marks, PJ Marshall, G Martellotti, L Martinazzoli, M Martinelli, D Martinez Santos, F Martinez Vidal, A Massafferri, M Materok, R Matev, A Mathad, Z Mathe, V Matiunin, C Matteuzzi, KR Mattioli, A Mauri, E Maurice, M McCann, L Mcconnell, A McNab, R McNulty, JV Mead, B Meadows, C Meaux, G Meier, N Meinert, D Melnychuk, S Meloni, M Merk, A Merli, L Meyer Garcia, M Mikhasenko, DA Milanes, E Millard, M-N Minard, O Mineev, L Minzoni, SE Mitchell, B Mitreska, DS Mitzel, A Mödden, A Mogini, RD Moise, 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 Mukherjee, M Mulder, D Müller, K Müller, CH Murphy, D Murray, P Muzzetto, P Naik, T Nakada, R Nandakumar, T Nanut, I Nasteva, M Needham, I Neri, N Neri, S Neubert, N Neufeld, R Newcombe, TD Nguyen, C Nguyen-Mau, EM Niel, S Nieswand, N Nikitin, NS Nolte, C Nunez, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, DP O'Hanlon, R Oldeman, CJG Onderwater, JD Osborn, A Ossowska, JM Otalora Goicochea, T Ovsiannikova, P Owen, A Oyanguren, PR Pais, T Pajero, A Palano, M Palutan, G Panshin, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, W Parker, C Parkes, CJ Parkinson, G Passaleva, A Pastore, M Patel, C Patrignani, A Pearce, A Pellegrino, M Pepe Altarelli, S Perazzini, D Pereima, P Perret, K Petridis, A Petrolini, A Petrov, S Petrucci, M Petruzzo, B Pietrzyk, G Pietrzyk, M Pili, D Pinci, J Pinzino, F Pisani, A Piucci, V Placinta, S Playfer, J Plews, M Plo Casasus, F Polci, M Poli Lener, M Poliakova, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, GJ Pomery, S Ponce, A Popov, D Popov, S Poslavskii, K Prasanth, L Promberger, C Prouve, V Pugatch, A Puig Navarro, H Pullen, G Punzi, W Qian, J Qin, R Quagliani, B Quintana, NV Raab, RI Rabadan Trejo, B Rachwal, JH Rademacker, M Rama, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Reboud, F Redi, F Reiss, C Remon Alepuz, Z Ren, V Renaudin, S Ricciardi, DS Richards, S Richards, K Rinnert, P Robbe, A Robert, AB Rodrigues, E Rodrigues, JA Rodriguez Lopez, M Roehrken, A Rollings, V Romanovskiy, M Romero Lamas, A Romero Vidal, JD Roth, M Rotondo, MS Rudolph, T Ruf, J Ruiz Vidal, A Ryzhikov, J Ryzka, JJ Saborido Silva, N Sagidova, N Sahoo, B Saitta, C Sanchez Gras, C Sanchez Mayordomo, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, G Sarpis, M Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, LG Scantlebury Smead, S Schael, M Schellenberg, M Schiller, H Schindler, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, HF Schreiner, M Schubiger, S Schulte, MH Schune, R Schwemmer, B Sciascia, A Sciubba, S Sellam, A Semennikov, A Sergi, N Serra, J Serrano, L Sestini, A Seuthe, P Seyfert, DM Shangase, M Shapkin, L Shchutska, T Shears, L Shekhtman, V Shevchenko, E Shmanin, JD Shupperd, BG Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, S Simone, I Skiba, N Skidmore, T Skwarnicki, MW Slater, JG Smeaton, A Smetkina, E Smith, IT Smith, M Smith, A Snoch, M Soares, L 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, O Steinkamp, S Stemmle, O Stenyakin, M Stepanova, H Stevens, S Stone, S Stracka, ME Stramaglia, M Straticiuc, S Strokov, J Sun, L Sun, Y Sun, P Svihra, K Swientek, A Szabelski, T Szumlak, M Szymanski, S Taneja, Z Tang, T Tekampe, F Teubert, E Thomas, KA Thomson, MJ Tilley, V Tisserand, S T'Jampens, M Tobin, S Tolk, L Tomassetti, D Torres Machado, DY Tou, E Tournefier, M Traill, MT Tran, E Trifonova, C Trippl, A Tsaregorodtsev, G Tuci, A Tully, N Tuning, A Ukleja, A Usachov, A Ustyuzhanin, U Uwer, A Vagner, V Vagnoni, A Valassi, G Valenti, M van Beuzekom, H Van Hecke, E van Herwijnen, CB Van Hulse, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, JJ Velthuis, M Veltri, A Venkateswaran, M Veronesi, M Vesterinen, JV Viana Barbosa, D Vieira, M Vieites Diaz, H Viemann, X Vilasis-Cardona, G Vitali, A Vitkovskiy, A Vollhardt, D Vom Bruch, A Vorobyev, V Vorobyev, N Voropaev, R Waldi, J Walsh, J Wang, J Wang, J Wang, M Wang, Y Wang, Z Wang, DR Ward, HM Wark, NK Watson, D Websdale, A Weiden, C Weisser, BDC Westhenry, DJ White, M Whitehead, D Wiedner, G Wilkinson, M Wilkinson, I Williams, M Williams, MRJ Williams, T Williams, FF Wilson, W Wislicki, M Witek, L Witola, G Wormser, SA Wotton, H Wu, K Wyllie, Z Xiang, D Xiao, Y Xie, H Xing, A Xu, J Xu, L Xu, M Xu, Q Xu, Z Xu, Z Xu, Z Yang, Z Yang, Y Yao, LE Yeomans, H Yin, J Yu, X Yuan, O Yushchenko, KA Zarebski, M Zavertyaev, M Zdybal, M Zeng, D Zhang, L Zhang, S Zhang, WC Zhang, Y Zhang, A Zhelezov, Y Zheng, X Zhou, Y Zhou, X Zhu, V Zhukov, JB Zonneveld, S Zucchelli, LHCb CollaborationAbstract:
The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed with a large significance and their masses and natural widths are measured to be m[Ξ_{c}(2923)^{0}]=2923.04±0.25±0.20±0.14 MeV, Γ[Ξ_{c}(2923)^{0}]=7.1±0.8±1.8 MeV, m[Ξ_{c}(2939)^{0}]=2938.55±0.21±0.17±0.14 MeV, Γ[Ξ_{c}(2939)^{0}]=10.2±0.8±1.1 MeV, m[Ξ_{c}(2965)^{0}]=2964.88±0.26±0.14±0.14 MeV, Γ[Ξ_{c}(2965)^{0}]=14.1±0.9±1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ_{c}^{+} mass. The Ξ_{c}(2923)^{0} and Ξ_{c}(2939)^{0} baryons are new states. The Ξ_{c}(2965)^{0} state is in the vicinity of the known Ξ_{c}(2970)^{0} baryon; however, their masses and natural widths differ significantly.Test of lepton universality with Λ b 0 → pK − ℓ + ℓ − decays
Journal of High Energy Physics Springer 2020:5 (2020) 40
Authors:
R Aaij, C Abellán Beteta, T Ackernley, B Adeva, M Adinolfi, H Afsharnia, CA Aidala, S Aiola, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, Y Amhis, L An, L Anderlini, G Andreassi, M AndreottiAbstract:
The ratio of branching fractions of the decays Λb0 → pK−e+e− and Λb0 → pK−μ+μ−, RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2< 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pK−e+e−.Search for the Rare Decays B_{s}^{0}→e^{+}e^{-} and B^{0}→e^{+}e^{-}.
Physical review letters 124:21 (2020) 211802
Authors:
R Aaij, C Abellán Beteta, T Ackernley, B Adeva, M Adinolfi, H Afsharnia, CA Aidala, S Aiola, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, F Archilli, 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, M Bartolini, F Baryshnikov, JM Basels, G Bassi, V Batozskaya, B Batsukh, A Battig, A Bay, M Becker, F Bedeschi, I Bediaga, A Beiter, V Belavin, S Belin, V Bellee, K Belous, I Belyaev, G Bencivenni, E Ben-Haim, S Benson, A Berezhnoy, R Bernet, D Berninghoff, HC Bernstein, C Bertella, E Bertholet, A Bertolin, C Betancourt, F Betti, MO Bettler, Ia Bezshyiko, S Bhasin, J Bhom, MS Bieker, S Bifani, P Billoir, A Bizzeti, M Bjørn, MP Blago, T Blake, F Blanc, S Blusk, D Bobulska, V Bocci, O Boente Garcia, T Boettcher, A Boldyrev, A Bondar, N Bondar, S Borghi, M Borisyak, M Borsato, JT Borsuk, TJV Bowcock, C Bozzi, MJ Bradley, S Braun, A Brea Rodriguez, M Brodski, J Brodzicka, A Brossa Gonzalo, D Brundu, E Buchanan, A Büchler-Germann, A Buonaura, C Burr, A Bursche, A Butkevich, JS Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, L Calero Diaz, S Cali, R Calladine, M Calvi, M Calvo Gomez, P Camargo Magalhaes, A Camboni, P Campana, DH Campora Perez, AF Campoverde Quezada, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, I Carli, P Carniti, K Carvalho Akiba, A Casais Vidal, G Casse, M Cattaneo, G Cavallero, S Celani, R Cenci, J Cerasoli, MG Chapman, M Charles, Ph Charpentier, G Chatzikonstantinidis, M Chefdeville, V Chekalina, C Chen, S Chen, A Chernov, S-G Chitic, V Chobanova, S Cholak, M Chrzaszcz, A Chubykin, V Chulikov, P Ciambrone, MF Cicala, X Cid Vidal, G Ciezarek, F Cindolo, PEL Clarke, M Clemencic, HV Cliff, J Closier, JL Cobbledick, V Coco, JAB Coelho, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Contu, N Cooke, G Coombs, S Coquereau, G Corti, CM Costa Sobral, B Couturier, DC Craik, J Crkovská, A Crocombe, M Cruz Torres, R Currie, 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, M De Cian, JM De Miranda, L De Paula, M De Serio, P De Simone, JA de Vries, CT Dean, W Dean, D Decamp, L Del Buono, B Delaney, H-P Dembinski, A Dendek, V Denysenko, D Derkach, O Deschamps, F Desse, F Dettori, B Dey, A Di Canto, P Di Nezza, S Didenko, H Dijkstra, V Dobishuk, F Dordei, M Dorigo, AC Dos Reis, L Douglas, A Dovbnya, K Dreimanis, MW Dudek, L Dufour, P Durante, JM Durham, D Dutta, M Dziewiecki, 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, A Falabella, J Fan, Y Fan, N Farley, S Farry, D Fazzini, P Fedin, M Féo, P Fernandez Declara, A Fernandez Prieto, 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, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, R Forty, V Franco Lima, M Franco Sevilla, M Frank, C Frei, DA Friday, J Fu, Q Fuehring, 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 García Pardiñas, B Garcia Plana, FA Garcia Rosales, L Garrido, D Gascon, C Gaspar, D Gerick, E Gersabeck, M Gersabeck, T Gershon, D Gerstel, Ph Ghez, V Gibson, A Gioventù, P Gironella Gironell, L Giubega, C Giugliano, K Gizdov, VV Gligorov, C Göbel, E Golobardes, D Golubkov, A Golutvin, A Gomes, P Gorbounov, IV Gorelov, C Gotti, E Govorkova, JP Grabowski, R Graciani Diaz, T Grammatico, LA Granado Cardoso, E Graugés, E Graverini, G Graziani, A Grecu, R Greim, P Griffith, L Grillo, L Gruber, BR Gruberg Cazon, C Gu, E Gushchin, A Guth, Yu Guz, T Gys, PA Günther, T Hadavizadeh, G Haefeli, C Haen, SC Haines, PM Hamilton, Q Han, X Han, TH Hancock, S Hansmann-Menzemer, N Harnew, T Harrison, R Hart, C Hasse, M Hatch, J He, M Hecker, K Heijhoff, K Heinicke, AM Hennequin, K Hennessy, L Henry, J Heuel, A Hicheur, D Hill, M Hilton, PH Hopchev, J Hu, J Hu, W Hu, W Huang, W Hulsbergen, T Humair, RJ Hunter, M Hushchyn, D Hutchcroft, D Hynds, P Ibis, M Idzik, P Ilten, A Inglessi, K Ivshin, R Jacobsson, S Jakobsen, E Jans, BK Jashal, A Jawahery, V Jevtic, F Jiang, M John, D Johnson, CR Jones, B Jost, N Jurik, S Kandybei, M Karacson, JM Kariuki, N Kazeev, M Kecke, F Keizer, M Kelsey, M Kenzie, T Ketel, B Khanji, A Kharisova, KE Kim, T Kirn, VS Kirsebom, S Klaver, K Klimaszewski, S Koliiev, A Kondybayeva, A Konoplyannikov, P Kopciewicz, R Kopecna, P Koppenburg, M Korolev, I Kostiuk, O Kot, S Kotriakhova, L Kravchuk, RD Krawczyk, M Kreps, F Kress, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, HS Kuindersma, GJ Kunde, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, D Lancierini, JJ Lane, G Lanfranchi, C Langenbruch, O Lantwin, T Latham, F Lazzari, R Le Gac, SH Lee, R Lefèvre, A Leflat, O Leroy, T Lesiak, B Leverington, H Li, L Li, X Li, Y Li, Z Li, X Liang, T Lin, R Lindner, V Lisovskyi, G Liu, X Liu, D Loh, A Loi, J Lomba Castro, I Longstaff, JH Lopes, G Loustau, GH Lovell, Y Lu, D Lucchesi, M Lucio Martinez, Y Luo, A Lupato, E Luppi, O Lupton, A Lusiani, X Lyu, S Maccolini, F Machefert, F Maciuc, V Macko, P Mackowiak, S Maddrell-Mander, LR Madhan Mohan, O Maev, A Maevskiy, D Maisuzenko, MW Majewski, S Malde, B Malecki, A Malinin, T Maltsev, H Malygina, G Manca, G Mancinelli, R Manera Escalero, D Manuzzi, D Marangotto, J Maratas, JF Marchand, U Marconi, S Mariani, C Marin Benito, M Marinangeli, P Marino, J Marks, PJ Marshall, G Martellotti, L Martinazzoli, M Martinelli, D Martinez Santos, F Martinez Vidal, A Massafferri, M Materok, R Matev, A Mathad, Z Mathe, V Matiunin, C Matteuzzi, KR Mattioli, A Mauri, E Maurice, M McCann, L Mcconnell, A McNab, R McNulty, JV Mead, B Meadows, C Meaux, G Meier, N Meinert, D Melnychuk, S Meloni, M Merk, A Merli, M Mikhasenko, DA Milanes, E Millard, M-N Minard, O Mineev, L Minzoni, SE Mitchell, B Mitreska, DS Mitzel, A Mödden, A Mogini, RD Moise, 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 Mukherjee, M Mulder, D Müller, K Müller, CH Murphy, D Murray, P Muzzetto, P Naik, T Nakada, R Nandakumar, T Nanut, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, R Newcombe, TD Nguyen, C Nguyen-Mau, EM Niel, S Nieswand, N Nikitin, NS Nolte, C Nunez, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, DP O'Hanlon, R Oldeman, CJG Onderwater, JD Osborn, A Ossowska, JM Otalora Goicochea, T Ovsiannikova, P Owen, A Oyanguren, PR Pais, T Pajero, A Palano, M Palutan, G Panshin, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, W Parker, C Parkes, G Passaleva, A Pastore, M Patel, C Patrignani, A Pearce, A Pellegrino, 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 Pili, D Pinci, J Pinzino, F Pisani, A Piucci, V Placinta, S Playfer, J Plews, M Plo Casasus, F Polci, M Poli Lener, M Poliakova, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, GJ Pomery, S Ponce, A Popov, D Popov, S Poslavskii, K Prasanth, L Promberger, C Prouve, V Pugatch, A Puig Navarro, H Pullen, G Punzi, W Qian, J Qin, R Quagliani, B Quintana, NV Raab, RI Rabadan Trejo, B Rachwal, JH Rademacker, M Rama, M Ramos Pernas, MS Rangel, F Ratnikov, G Raven, M Reboud, F Redi, F Reiss, C Remon Alepuz, Z Ren, V Renaudin, S Ricciardi, DS Richards, S Richards, K Rinnert, P Robbe, A Robert, AB Rodrigues, E Rodrigues, JA Rodriguez Lopez, M Roehrken, A Rollings, V Romanovskiy, M Romero Lamas, A Romero Vidal, JD Roth, M Rotondo, MS Rudolph, T Ruf, J Ruiz Vidal, A Ryzhikov, J Ryzka, JJ Saborido Silva, N Sagidova, N Sahoo, B Saitta, C Sanchez Gras, C Sanchez Mayordomo, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, G Sarpis, M Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, LG Scantlebury Smead, S Schael, M Schellenberg, M Schiller, H Schindler, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, HF Schreiner, M Schubiger, S Schulte, MH Schune, R Schwemmer, B Sciascia, A Sciubba, S Sellam, A Semennikov, A Sergi, N Serra, J Serrano, L Sestini, A Seuthe, P Seyfert, DM Shangase, M Shapkin, L Shchutska, T Shears, L Shekhtman, V Shevchenko, E Shmanin, JD Shupperd, BG Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, S Simone, I Skiba, N Skidmore, T Skwarnicki, MW Slater, JG Smeaton, A Smetkina, E Smith, IT Smith, M Smith, A Snoch, M Soares, L 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, O Steinkamp, S Stemmle, O Stenyakin, M Stepanova, H Stevens, S Stone, S Stracka, ME Stramaglia, M Straticiuc, S Strokov, J Sun, L Sun, Y Sun, P Svihra, K Swientek, A Szabelski, T Szumlak, M Szymanski, S Taneja, Z Tang, T Tekampe, F Teubert, E Thomas, KA Thomson, MJ Tilley, V Tisserand, S T'Jampens, M Tobin, S Tolk, L Tomassetti, D Torres Machado, DY Tou, E Tournefier, M Traill, MT Tran, E Trifonova, C Trippl, A Tsaregorodtsev, G Tuci, A Tully, N Tuning, A Ukleja, A Usachov, A Ustyuzhanin, U Uwer, A Vagner, V Vagnoni, A Valassi, G Valenti, M van Beuzekom, H Van Hecke, E van Herwijnen, CB Van Hulse, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, JJ Velthuis, M Veltri, A Venkateswaran, M Veronesi, M Vesterinen, JV Viana Barbosa, D Vieira, M Vieites Diaz, H Viemann, X Vilasis-Cardona, G Vitali, A Vitkovskiy, A Vollhardt, D Vom Bruch, A Vorobyev, V Vorobyev, N Voropaev, R Waldi, J Walsh, J Wang, J Wang, J Wang, M Wang, Y Wang, Z Wang, DR Ward, HM Wark, NK Watson, D Websdale, A Weiden, C Weisser, BDC Westhenry, DJ White, M Whitehead, D Wiedner, G Wilkinson, M Wilkinson, I Williams, M Williams, MRJ Williams, T Williams, FF Wilson, W Wislicki, M Witek, L Witola, G Wormser, SA Wotton, H Wu, K Wyllie, Z Xiang, D Xiao, Y Xie, H Xing, A Xu, J Xu, L Xu, M Xu, Q Xu, Z Xu, Z Yang, Z Yang, Y Yao, LE Yeomans, H Yin, J Yu, X Yuan, O Yushchenko, KA Zarebski, M Zavertyaev, M Zdybal, M Zeng, D Zhang, L Zhang, S Zhang, WC Zhang, Y Zhang, A Zhelezov, Y Zheng, X Zhou, Y Zhou, X Zhu, V Zhukov, JB Zonneveld, S Zucchelli, LHCb CollaborationAbstract:
A search for the decays B_{s}^{0}→e^{+}e^{-} and B^{0}→e^{+}e^{-} is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and 2 fb^{-1}, respectively. No signal is observed. Assuming no contribution from B^{0}→e^{+}e^{-} decays, an upper limit on the branching fraction B(B_{s}^{0}→e^{+}e^{-})<9.4(11.2)×10^{-9} is obtained at 90(95)% confidence level. If no B_{s}^{0}→e^{+}e^{-} contribution is assumed, a limit of B(B^{0}→e^{+}e^{-})<2.5(3.0)×10^{-9} is determined at 90(95)% confidence level. These upper limits are more than one order of magnitude lower than the previous values.Phase I Upgrade of the Readout System of the Vertex Detector at the LHCb Experiment
IEEE Transactions on Nuclear Science Institute of Electrical and Electronics Engineers (IEEE) 67:4 (2020) 732-739
Authors:
Antonio Fernandez Prieto, Pablo Vazquez Regueiro, Karol Hennessy, Jan Buytaert, Martin van Beuzekom, Edgar Lemos Cid, Lars Eklund, Kristof de Bruyn, Sneha Naik, Manuel Schiller, Donal Murray, Alexander Leflat, Oscar Boente Garcia, Abraham Gallas Torreira, Beatriz Garcia Plana, Themis Bowcock, Francesco Dettori, Karlis Dreimanis, Vinicius Franco Lima, David Hutchcroft, Kurt Rinnert, Tara Shears, Oscar Augusto, Victor Coco, Paula Collins, Tim Evans, Massi Ferro-Luzzi, Wolfgang Funk, Heinrich Schindler, Kazu Akiba, Elena Dall'Occo, Cristina Sanchez Graz, Wouter Hulsbergen, Daniel Hynds, Igor Kostiuk, Marcel Merk, Aleksandra Snoch, Dana Seman Bobulska, Silvia Borghi, Stefano de Capua, Deepanwita Dutta, Marco Gersabeck, Chris Parkes, Peter Svihra, Mark Williams, Galina Bogdanova, Vladimir Volkov, Pawel Kopciewicz, Maciej Majewski, Agnieszka Oblakowska-Mucha, Bartlomej Rachwal, Tomasz Szumlak, Lucas Meyer Garcia, Franciole Marinho, Larissa Helena Mendes, Irina Nasteva, Juan Otalora, Gabriel Rodrigues, Jaap Velthuis, Pawel Jalocha, Malcolm John, Nathan Jurik, Luke Scantlebury-Smead, John Back, Tim Gershon, Tom Latham, Andrew MorrisMeasurement of |Vcb| with Bs0→Ds(*)-μ+νμ decays
Physical Review D American Physical Society (APS) 101:7 (2020) 072004