Test of lepton universality with $Λ^{0}_{b} \to p K^- \ell^+ \ell^-$ decays
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Beteta, C. Abellán
name: Ackernley, T.
name: Adeva, B.
name: Adinolfi, M.
name: Afsharnia, H.
name: Aidala, C. A.
name: Aiola, S.
name: Ajaltouni, Z.
name: Akar, S.
name: Albicocco, P.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Albero, A. Alfonso
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andreassi, G.
name: Andreotti, M.
name: Archilli, F.
name: Romeu, J. Arnau
name: Artamonov, A.
name: Artuso, M.
name: Arzymatov, K.
name: Aslanides, E.
name: Atzeni, M.
name: Audurier, B.
name: Bachmann, S.
name: Back, J. J.
name: Baker, S.
name: Balagura, V.
name: Baldini, W.
name: Baranov, A.
name: Barlow, R. J.
name: Barsuk, S.
name: Barter, W.
name: Bartolini, M.
name: Baryshnikov, F.
name: Bassi, G.
name: Batozskaya, V.
name: Batsukh, B.
name: Battig, A.
name: Bay, A.
name: Becker, M.
name: Bedeschi, F.
name: Bediaga, I.
name: Beiter, A.
name: Bel, L. J.
name: Belavin, V.
name: Belin, S.
name: Beliy, N.
name: Bellee, V.
name: Belous, K.
name: Belyaev, I.
name: Bencivenni, G.
name: Ben-Haim, E.
name: Benson, S.
name: Beranek, S.
name: Berezhnoy, A.
name: Bernet, R.
name: Berninghoff, D.
name: Bernstein, H. C.
name: Bertella, C.
name: Bertholet, E.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bettler, M. O.
name: Bezshyiko, Ia.
name: Bhasin, S.
name: Bhom, J.
name: Bieker, M. S.
name: Bifani, S.
name: Billoir, P.
name: Bizzeti, A.
name: Bjørn, M.
name: Blago, M. P.
name: Blake, T.
name: Blanc, F.
name: Blusk, S.
name: Bobulska, D.
name: Bocci, V.
name: Garcia, O. Boente
name: Boettcher, T.
name: Boldyrev, A.
name: Bondar, A.
name: Bondar, N.
name: Borghi, S.
name: Borisyak, M.
name: Borsato, M.
name: Borsuk, J. T.
name: Bowcock, T. J. V.
name: Bozzi, C.
name: Bradley, M. J.
name: Braun, S.
name: Rodriguez, A. Brea
name: Brodski, M.
name: Brodzicka, J.
name: Gonzalo, A. Brossa
name: Brundu, D.
name: Buchanan, E.
name: Büchler-Germann, A.
name: Buonaura, A.
name: Burr, C.
name: Bursche, A.
name: Butter, J. S.
name: Buytaert, J.
name: Byczynski, W.
name: Cadeddu, S.
name: Cai, H.
name: Calabrese, R.
name: Diaz, L. Calero
name: Cali, S.
name: Calladine, R.
name: Calvi, M.
name: Gomez, M. Calvo
name: Magalhaes, P. Camargo
name: Camboni, A.
name: Campana, P.
name: Perez, D. H. Campora
name: Capriotti, L.
name: Carbone, A.
name: Carboni, G.
name: Cardinale, R.
name: Cardini, A.
name: Carniti, P.
name: Akiba, K. Carvalho
name: Vidal, A. Casais
name: Casse, G.
name: Cattaneo, M.
name: Cavallero, G.
name: Celani, S.
name: Cenci, R.
name: Cerasoli, J.
name: Chapman, M. G.
name: Charles, M.
name: Charpentier, Ph.
name: Chatzikonstantinidis, G.
name: Chefdeville, M.
name: Chekalina, V.
name: Chen, C.
name: Chen, S.
name: Chernov, A.
name: Chitic, S. -G.
name: Chobanova, V.
name: Chrzaszcz, M.
name: Chubykin, A.
name: Ciambrone, P.
name: Cicala, M. F.
name: Vidal, X. Cid
name: Ciezarek, G.
name: Cindolo, F.
name: Clarke, P. E. L.
name: Clemencic, M.
name: Cliff, H. V.
name: Closier, J.
name: Cobbledick, J. L.
name: Coco, V.
name: Coelho, J. A. B.
name: Cogan, J.
name: Cogneras, E.
name: Cojocariu, L.
name: Collins, P.
name: Colombo, T.
name: Comerma-Montells, A.
name: Contu, A.
name: Cooke, N.
name: Coombs, G.
name: Coquereau, S.
name: Corti, G.
name: Sobral, C. M. Costa
name: Couturier, B.
name: Craik, D. C.
name: Crkovská, J.
name: Crocombe, A.
name: Torres, M. Cruz
name: Currie, R.
name: Da Silva, C. L.
name: Dall'Occo, E.
name: Dalseno, J.
name: D'Ambrosio, C.
name: Danilina, A.
name: d'Argent, P.
name: Davis, A.
name: Francisco, O. De Aguiar
name: De Bruyn, K.
name: De Capua, S.
name: De Cian, M.
name: De Miranda, J. M.
name: De Paula, L.
name: De Serio, M.
name: De Simone, P.
name: de Vries, J. A.
name: Dean, C. T.
name: Dean, W.
name: Decamp, D.
name: Del Buono, L.
name: Delaney, B.
name: Dembinski, H. -P.
name: Demmer, M.
name: Dendek, A.
name: Denysenko, V.
name: Derkach, D.
name: Deschamps, O.
name: Desse, F.
name: Dettori, F.
name: Dey, B.
name: Di Canto, A.
name: Di Nezza, P.
name: Didenko, S.
name: Dijkstra, H.
name: Dobishuk, V.
name: Dordei, F.
name: Dorigo, M.
name: Reis, A. C. dos
name: Douglas, L.
name: Dovbnya, A.
name: Dreimanis, K.
name: Dudek, M. W.
name: Dufour, L.
name: Dujany, G.
name: Durante, P.
name: Durham, J. M.
name: Dutta, D.
name: Dziewiecki, M.
name: Dziurda, A.
name: Dzyuba, A.
name: Easo, S.
name: Egede, U.
name: Egorychev, V.
name: Eidelman, S.
name: Eisenhardt, S.
name: Ekelhof, R.
name: Ek-In, S.
name: Eklund, L.
name: Ely, S.
name: Ene, A.
name: Epple, E.
name: Escher, S.
name: Esen, S.
name: Evans, T.
name: Falabella, A.
name: Fan, J.
name: Farley, N.
name: Farry, S.
name: Fazzini, D.
name: Fedin, P.
name: Féo, M.
name: Declara, P. Fernandez
name: Prieto, A. Fernandez
name: Ferrari, F.
name: Lopes, L. Ferreira
name: Rodrigues, F. Ferreira
name: Sole, S. Ferreres
name: Ferrillo, M.
name: Ferro-Luzzi, M.
name: Filippov, S.
name: Fini, R. A.
name: Fiorini, M.
name: Firlej, M.
name: Fischer, K. M.
name: Fitzpatrick, C.
name: Fiutowski, T.
name: Fleuret, F.
name: Fontana, M.
name: Fontanelli, F.
name: Forty, R.
name: Lima, V. Franco
name: Sevilla, M. Franco
name: Frank, M.
name: Frei, C.
name: Friday, D. A.
name: Fu, J.
name: Fuehring, Q.
name: Funk, W.
name: Gabriel, E.
name: Torreira, A. Gallas
name: Galli, D.
name: Gallorini, S.
name: Gambetta, S.
name: Gan, Y.
name: Gandelman, M.
name: Gandini, P.
name: Gao, Y.
name: Martin, L. M. Garcia
name: Pardiñas, J. García
name: Plana, B. Garcia
name: Rosales, F. A. Garcia
name: Tico, J. Garra
name: Garrido, L.
name: Gascon, D.
name: Gaspar, C.
name: Gerick, D.
name: Gersabeck, E.
name: Gersabeck, M.
name: Gershon, T.
name: Gerstel, D.
name: Ghez, Ph.
name: Gibson, V.
name: Gioventù, A.
name: Girard, O. G.
name: Gironell, P. Gironella
name: Giubega, L.
name: Giugliano, C.
name: Gizdov, K.
name: Gligorov, V. V.
name: Göbel, C.
name: Golobardes, E.
name: Golubkov, D.
name: Golutvin, A.
name: Gomes, A.
name: Gorbounov, P.
name: Gorelov, I. V.
name: Gotti, C.
name: Govorkova, E.
name: Grabowski, J. P.
name: Diaz, R. Graciani
name: Grammatico, T.
name: Cardoso, L. A. Granado
name: Graugés, E.
name: Graverini, E.
name: Graziani, G.
name: Grecu, A.
name: Greim, R.
name: Griffith, P.
name: Grillo, L.
name: Gruber, L.
name: Cazon, B. R. Gruberg
name: Gu, C.
name: Gushchin, E.
name: Guth, A.
name: Guz, Yu.
name: Gys, T.
name: Günther, P. A.
name: Hadavizadeh, T.
name: Haefeli, G.
name: Haen, C.
name: Haines, S. C.
name: Hamilton, P. M.
name: Han, Q.
name: Han, X.
name: Hancock, T. H.
name: Hansmann-Menzemer, S.
name: Harnew, N.
name: Harrison, T.
name: Hart, R.
name: Hasse, C.
name: Hatch, M.
name: He, J.
name: Hecker, M.
name: Heijhoff, K.
name: Heinicke, K.
name: Heister, A.
name: Hennequin, A. M.
name: Hennessy, K.
name: Henry, L.
name: Heuel, J.
name: Hicheur, A.
name: Hill, D.
name: Hilton, M.
name: Hopchev, P. H.
name: Hu, J.
name: Hu, W.
name: Huang, W.
name: Hulsbergen, W.
name: Humair, T.
name: Hunter, R. J.
name: Hushchyn, M.
name: Hutchcroft, D.
name: Hynds, D.
name: Ibis, P.
name: Idzik, M.
name: Ilten, P.
name: Inglessi, A.
name: Inyakin, A.
name: Ivshin, K.
name: Jacobsson, R.
name: Jakobsen, S.
name: Jans, E.
name: Jashal, B. K.
name: Jawahery, A.
name: Jevtic, V.
name: Jiang, F.
name: John, M.
name: Johnson, D.
name: Jones, C. R.
name: Jost, B.
name: Jurik, N.
name: Kandybei, S.
name: Karacson, M.
name: Kariuki, J. M.
name: Kazeev, N.
name: Kecke, M.
name: Keizer, F.
name: Kelsey, M.
name: Kenzie, M.
name: Ketel, T.
name: Khanji, B.
name: Kharisova, A.
name: Kim, K. E.
name: Kirn, T.
name: Kirsebom, V. S.
name: Klaver, S.
name: Klimaszewski, K.
name: Koliiev, S.
name: Kondybayeva, A.
name: Konoplyannikov, A.
name: Kopciewicz, P.
name: Kopecna, R.
name: Koppenburg, P.
name: Korolev, M.
name: Kostiuk, I.
name: Kot, O.
name: Kotriakhova, S.
name: Kravchuk, L.
name: Krawczyk, R. D.
name: Kreps, M.
name: Kress, F.
name: Kretzschmar, S.
name: Krokovny, P.
name: Krupa, W.
name: Krzemien, W.
name: Kucewicz, W.
name: Kucharczyk, M.
name: Kudryavtsev, V.
name: Kuindersma, H. S.
name: Kunde, G. J.
name: Kvaratskheliya, T.
name: Lacarrere, D.
name: Lafferty, G.
name: Lai, A.
name: Lancierini, D.
name: Lane, J. J.
name: Lanfranchi, G.
name: Langenbruch, C.
name: Lantwin, O.
name: Latham, T.
name: Lazzari, F.
name: Lazzeroni, C.
name: Gac, R. Le
name: Lefèvre, R.
name: Leflat, A.
name: Leroy, O.
name: Lesiak, T.
name: Leverington, B.
name: Li, H.
name: Li, X.
name: Li, Y.
name: Li, Z.
name: Liang, X.
name: Lindner, R.
name: Lisovskyi, V.
name: Liu, G.
name: Liu, X.
name: Loh, D.
name: Loi, A.
name: Castro, J. Lomba
name: Longstaff, I.
name: Lopes, J. H.
name: Loustau, G.
name: Lovell, G. H.
name: Lu, Y.
name: Lucchesi, D.
name: Martinez, M. Lucio
name: Luo, Y.
name: Lupato, A.
name: Luppi, E.
name: Lupton, O.
name: Lusiani, A.
name: Lyu, X.
name: Maccolini, S.
name: Machefert, F.
name: Maciuc, F.
name: Macko, V.
name: Mackowiak, P.
name: Maddrell-Mander, S.
name: Mohan, L. R. Madhan
name: Maev, O.
name: Maevskiy, A.
name: Maisuzenko, D.
name: Majewski, M. W.
name: Malde, S.
name: Malecki, B.
name: Malinin, A.
name: Maltsev, T.
name: Malygina, H.
name: Manca, G.
name: Mancinelli, G.
name: Escalero, R. Manera
name: Manuzzi, D.
name: Marangotto, D.
name: Maratas, J.
name: Marchand, J. F.
name: Marconi, U.
name: Mariani, S.
name: Benito, C. Marin
name: Marinangeli, M.
name: Marino, P.
name: Marks, J.
name: Marshall, P. J.
name: Martellotti, G.
name: Martinazzoli, L.
name: Martinelli, M.
name: Santos, D. Martinez
name: Vidal, F. Martinez
name: Massafferri, A.
name: Materok, M.
name: Matev, R.
name: Mathad, A.
name: Mathe, Z.
name: Matiunin, V.
name: Matteuzzi, C.
name: Mattioli, K. R.
name: Mauri, A.
name: Maurice, E.
name: McCann, M.
name: Mcconnell, L.
name: McNab, A.
name: McNulty, R.
name: Mead, J. V.
name: Meadows, B.
name: Meaux, C.
name: Meier, G.
name: Meinert, N.
name: Melnychuk, D.
name: Meloni, S.
name: Merk, M.
name: Merli, A.
name: Mikhasenko, M.
name: Milanes, D. A.
name: Millard, E.
name: Minard, M. -N.
name: Mineev, O.
name: Minzoni, L.
name: Mitchell, S. E.
name: Mitreska, B.
name: Mitzel, D. S.
name: Mödden, A.
name: Mogini, A.
name: Moise, R. D.
name: Mombächer, T.
name: Monroy, I. A.
name: Monteil, S.
name: Morandin, M.
name: Morello, G.
name: Morello, M. J.
name: Moron, J.
name: Morris, A. B.
name: Morris, A. G.
name: Mountain, R.
name: Mu, H.
name: Muheim, F.
name: Mukherjee, M.
name: Mulder, M.
name: Müller, D.
name: Müller, K.
name: Müller, V.
name: Murphy, C. H.
name: Murray, D.
name: Muzzetto, P.
name: Naik, P.
name: Nakada, T.
name: Nandakumar, R.
name: Nandi, A.
name: Nanut, T.
name: Nasteva, I.
name: Needham, M.
name: Neri, N.
name: Neubert, S.
name: Neufeld, N.
name: Newcombe, R.
name: Nguyen, T. D.
name: Nguyen-Mau, C.
name: Niel, E. M.
name: Nieswand, S.
name: Nikitin, N.
name: Nolte, N. S.
name: Nunez, C.
name: Oblakowska-Mucha, A.
name: Obraztsov, V.
name: Ogilvy, S.
name: O'Hanlon, D. P.
name: Oldeman, R.
name: Onderwater, C. J. G.
name: Osborn, J. D.
name: Ossowska, A.
name: Goicochea, J. M. Otalora
name: Ovsiannikova, T.
name: Owen, P.
name: Oyanguren, A.
name: Pais, P. R.
name: Pajero, T.
name: Palano, A.
name: Palutan, M.
name: Panshin, G.
name: Papanestis, A.
name: Pappagallo, M.
name: Pappalardo, L. L.
name: Pappenheimer, C.
name: Parker, W.
name: Parkes, C.
name: Passaleva, G.
name: Pastore, A.
name: Patel, M.
name: Patrignani, C.
name: Pearce, A.
name: Pellegrino, A.
name: Altarelli, M. Pepe
name: Perazzini, S.
name: Pereima, D.
name: Perret, P.
name: Pescatore, L.
name: Petridis, K.
name: Petrolini, A.
name: Petrov, A.
name: Petrucci, S.
name: Petruzzo, M.
name: Pietrzyk, B.
name: Pietrzyk, G.
name: Pili, M.
name: Pinci, D.
name: Pinzino, J.
name: Pisani, F.
name: Piucci, A.
name: Placinta, V.
name: Playfer, S.
name: Plews, J.
name: Casasus, M. Plo
name: Polci, F.
name: Lener, M. Poli
name: Poliakova, M.
name: Poluektov, A.
name: Polukhina, N.
name: Polyakov, I.
name: Polycarpo, E.
name: Pomery, G. J.
name: Ponce, S.
name: Popov, A.
name: Popov, D.
name: Poslavskii, S.
name: Prasanth, K.
name: Promberger, L.
name: Prouve, C.
name: Pugatch, V.
name: Navarro, A. Puig
name: Pullen, H.
name: Punzi, G.
name: Qian, W.
name: Qin, J.
name: Quagliani, R.
name: Quintana, B.
name: Raab, N. V.
name: Trejo, R. I. Rabadan
name: Rachwal, B.
name: Rademacker, J. H.
name: Rama, M.
name: Pernas, M. Ramos
name: Rangel, M. S.
name: Ratnikov, F.
name: Raven, G.
name: Reboud, M.
name: Redi, F.
name: Reiss, F.
name: Alepuz, C. Remon
name: Ren, Z.
name: Renaudin, V.
name: Ricciardi, S.
name: Richards, S.
name: Rinnert, K.
name: Robbe, P.
name: Robert, A.
name: Rodrigues, A. B.
name: Rodrigues, E.
name: Lopez, J. A. Rodriguez
name: Roehrken, M.
name: Roiser, S.
name: Rollings, A.
name: Romanovskiy, V.
name: Lamas, M. Romero
name: Vidal, A. Romero
name: Roth, J. D.
name: Rotondo, M.
name: Rudolph, M. S.
name: Ruf, T.
name: Vidal, J. Ruiz
name: Ryzka, J.
name: Silva, J. J. Saborido
name: Sagidova, N.
name: Saitta, B.
name: Gras, C. Sanchez
name: Mayordomo, C. Sanchez
name: Santacesaria, R.
name: Rios, C. Santamarina
name: Santimaria, M.
name: Santovetti, E.
name: Sarpis, G.
name: Sarti, A.
name: Satriano, C.
name: Satta, A.
name: Saur, M.
name: Savrina, D.
name: Smead, L. G. Scantlebury
name: Schael, S.
name: Schellenberg, M.
name: Schiller, M.
name: Schindler, H.
name: Schmelling, M.
name: Schmelzer, T.
name: Schmidt, B.
name: Schneider, O.
name: Schopper, A.
name: Schreiner, H. F.
name: Schubiger, M.
name: Schulte, S.
name: Schune, M. H.
name: Schwemmer, R.
name: Sciascia, B.
name: Sciubba, A.
name: Sellam, S.
name: Semennikov, A.
name: Sergi, A.
name: Serra, N.
name: Serrano, J.
name: Sestini, L.
name: Seuthe, A.
name: Seyfert, P.
name: Shangase, D. M.
name: Shapkin, M.
name: Shchutska, L.
name: Shears, T.
name: Shekhtman, L.
name: Shevchenko, V.
name: Shmanin, E.
name: Shupperd, J. D.
name: Siddi, B. G.
name: Coutinho, R. Silva
name: de Oliveira, L. Silva
name: Simi, G.
name: Simone, S.
name: Skiba, I.
name: Skidmore, N.
name: Skwarnicki, T.
name: Slater, M. W.
name: Smeaton, J. G.
name: Smetkina, A.
name: Smith, E.
name: Smith, I. T.
name: Smith, M.
name: Snoch, A.
name: Soares, M.
name: Lavra, L. Soares
name: Sokoloff, M. D.
name: Soler, F. J. P.
name: De Paula, B. Souza
name: Spaan, B.
name: Norella, E. Spadaro
name: Spradlin, P.
name: Stagni, F.
name: Stahl, M.
name: Stahl, S.
name: Stefko, P.
name: Steinkamp, O.
name: Stemmle, S.
name: Stenyakin, O.
name: Stepanova, M.
name: Stevens, H.
name: Stone, S.
name: Stracka, S.
name: Stramaglia, M. E.
name: Straticiuc, M.
name: Strokov, S.
name: Sun, J.
name: Sun, L.
name: Sun, Y.
name: Svihra, P.
name: Swientek, K.
name: Szabelski, A.
name: Szumlak, T.
name: Szymanski, M.
name: Taneja, S.
name: Tang, Z.
name: Tekampe, T.
name: Tellarini, G.
name: Teubert, F.
name: Thomas, E.
name: Thomson, K. A.
name: Tilley, M. J.
name: Tisserand, V.
name: T'Jampens, S.
name: Tobin, M.
name: Tolk, S.
name: Tomassetti, L.
name: Tonelli, D.
name: Machado, D. Torres
name: Tou, D. Y.
name: Tournefier, E.
name: Traill, M.
name: Tran, M. T.
name: Trippl, C.
name: Trisovic, A.
name: Tsaregorodtsev, A.
name: Tuci, G.
name: Tully, A.
name: Tuning, N.
name: Ukleja, A.
name: Usachov, A.
name: Ustyuzhanin, A.
name: Uwer, U.
name: Vagner, A.
name: Vagnoni, V.
name: Valassi, A.
name: Valenti, G.
name: van Beuzekom, M.
name: Van Hecke, H.
name: van Herwijnen, E.
name: Van Hulse, C. B.
name: van Veghel, M.
name: Gomez, R. Vazquez
name: Regueiro, P. Vazquez
name: Sierra, C. Vázquez
name: Vecchi, S.
name: Velthuis, J. J.
name: Veltri, M.
name: Venkateswaran, A.
name: Vernet, M.
name: Veronesi, M.
name: Vesterinen, M.
name: Barbosa, J. V. Viana
name: Vieira, D.
name: Diaz, M. Vieites
name: Viemann, H.
name: Vilasis-Cardona, X.
name: Vitkovskiy, A.
name: Vollhardt, A.
name: Bruch, D. Vom
name: Vorobyev, A.
name: Vorobyev, V.
name: Voropaev, N.
name: Waldi, R.
name: Walsh, J.
name: Wang, J.
name: Wang, J.
name: Wang, J.
name: Wang, M.
name: Wang, Y.
name: Wang, Z.
name: Ward, D. R.
name: Wark, H. M.
name: Watson, N. K.
name: Websdale, D.
name: Weiden, A.
name: Weisser, C.
name: Westhenry, B. D. C.
name: White, D. J.
name: Whitehead, M.
name: Wiedner, D.
name: Wilkinson, G.
name: Wilkinson, M.
name: Williams, I.
name: Williams, M.
name: Williams, M. R. J.
name: Williams, T.
name: Wilson, F. F.
name: Wislicki, W.
name: Witek, M.
name: Witola, L.
name: Wormser, G.
name: Wotton, S. A.
name: Wu, H.
name: Wyllie, K.
name: Xiang, Z.
name: Xiao, D.
name: Xie, Y.
name: Xing, H.
name: Xu, A.
name: Xu, L.
name: Xu, M.
name: Xu, Q.
name: Xu, Z.
name: Xu, Z.
name: Yang, Z.
name: Yang, Z.
name: Yao, Y.
name: Yeomans, L. E.
name: Yin, H.
name: Yu, J.
name: Yuan, X.
name: Yushchenko, O.
name: Zarebski, K. A.
name: Zavertyaev, M.
name: Zdybal, M.
name: Zeng, M.
name: Zhang, D.
name: Zhang, L.
name: Zhang, S.
name: Zhang, W. C.
name: Zhang, Y.
name: Zhelezov, A.
name: Zheng, Y.
name: Zhou, X.
name: Zhou, Y.
name: Zhu, X.
name: Zhukov, V.
name: Zonneveld, J. B.
name: Zucchelli, S.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The ratio of branching fractions of the decays $Λ^{0}_{b}\to pK^{-}e^{+}e^{-}$ and $Λ^{0}_{b}\to pK^{-}μ^{+}μ^{-}$, $R^{-1}_{pK}$, 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 $0.1 &lt; q^{2} &lt; 6.0$ $GeV^{2}/c^{4}$ and the $pK^{-}$ mass range $m(pK^{-}) &lt; 2600$ $MeV/c^{2}$, the ratio of branching fractions is measured to be $R^{-1}_{pK} = 1.17 ^{+0.18}_{-0.16} \pm 0.07$, 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 $Λ^{0}_{b}\to pK^{-}e^{+}e^{-}$.
description: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-040.html (LHCb public pages)