Λₙᵇ⁰→J/ψΛ(Σ⁰)和Ξₙᵇ⁰→J/ψΞ⁰(Λ)衰变中的同位旋振幅
Isospin Amplitudes in Λ_{b}^{0}→J/ψΛ(Σ^{0}) and Ξ_{b}^{0}→J/ψΞ^{0}(Λ) Decays.
作者信息
Aaij R, Abellán Beteta C, Ackernley T, Adeva B, Adinolfi M, Afsharnia H, Aidala C A, Aiola S, Ajaltouni Z, Akar S, Albicocco P, Albrecht J, Alessio F, Alexander M, Alfonso Albero A, Alkhazov G, Alvarez Cartelle P, Alves A A, Amato S, Amhis Y, An L, Anderlini L, Andreassi G, Andreotti M, Archilli F, Arnau Romeu J, Artamonov A, Artuso M, Arzymatov K, Aslanides E, Atzeni M, Audurier B, Bachmann S, Back J J, Baker S, Balagura V, Baldini W, Baranov A, Barlow R J, Barsuk S, Barter W, Bartolini M, Baryshnikov F, Bassi G, Batozskaya V, Batsukh B, Battig A, Bay A, Becker M, Bedeschi F, Bediaga I, Beiter A, Bel L J, Belavin V, Belin S, Beliy N, Bellee V, Belous K, Belyaev I, Bencivenni G, Ben-Haim E, Benson S, Beranek S, Berezhnoy A, Bernet R, Berninghoff D, Bernstein H C, Bertella C, Bertholet E, Bertolin A, Betancourt C, Betti F, Bettler M O, Bezshyiko Ia, Bhasin S, Bhom J, Bieker M S, Bifani S, Billoir P, Bizzeti A, Bjørn M, Blago M P, Blake T, Blanc F, Blusk S, Bobulska D, Bocci V, Boente Garcia O, Boettcher T, Boldyrev A, Bondar A, Bondar N, Borghi S, Borisyak M, Borsato M, Borsuk J T, Bowcock T J V, Bozzi C, Bradley M J, Braun S, Brea Rodriguez A, Brodski M, Brodzicka J, Brossa Gonzalo A, Brundu D, Buchanan E, Buonaura A, Burr C, Bursche A, Butter J S, Buytaert J, Byczynski W, Cadeddu S, Cai H, Calabrese R, Calero Diaz L, Cali S, Calladine R, Calvi M, Calvo Gomez M, Camargo Magalhaes P, Camboni A, Campana P, Campora Perez D H, Capriotti L, Carbone A, Carboni G, Cardinale R, Cardini A, Carniti P, Carvalho Akiba K, Casais Vidal A, Casse G, Cattaneo M, Cavallero G, Celani S, Cenci R, Cerasoli J, Chapman M G, Charles M, Charpentier Ph, Chatzikonstantinidis G, Chefdeville M, Chekalina V, Chen C, Chen S, Chernov A, Chitic S-G, Chobanova V, Chrzaszcz M, Chubykin A, Ciambrone P, Cicala M F, Cid Vidal X, Ciezarek G, Cindolo F, Clarke P E L, Clemencic M, Cliff H V, Closier J, Cobbledick J L, Coco V, Coelho J A B, Cogan J, Cogneras E, Cojocariu L, Collins P, Colombo T, Comerma-Montells A, Contu A, Cooke N, Coombs G, Coquereau S, Corti G, Costa Sobral C M, Couturier B, Craik D C, Crkovska J, Crocombe A, Cruz Torres M, Currie R, Da Silva C L, Dall'Occo E, Dalseno J, D'Ambrosio C, Danilina A, d'Argent P, Davis A, De Aguiar Francisco O, De Bruyn K, De Capua S, De Cian M, De Miranda J M, De Paula L, De Serio M, De Simone P, de Vries J A, Dean C T, Dean W, Decamp D, Del Buono L, Delaney B, Dembinski H-P, Demmer M, Dendek A, Denysenko V, Derkach D, Deschamps O, Desse F, Dettori F, Dey B, Di Canto A, Di Nezza P, Didenko S, Dijkstra H, Dobishuk V, Dordei F, Dorigo M, Dos Reis A C, Douglas L, Dovbnya A, Dreimanis K, Dudek M W, Dufour L, Dujany G, Durante P, Durham J M, Dutta D, Dziewiecki M, Dziurda A, Dzyuba A, Easo S, Egede U, Egorychev V, Eidelman S, Eisenhardt S, Ekelhof R, Ek-In S, Eklund L, Ely S, Ene A, Epple E, Escher S, Esen S, Evans T, Falabella A, Fan J, Farley N, Farry S, Fazzini D, Fedin P, Féo M, Fernandez Declara P, Fernandez Prieto A, Ferrari F, Ferreira Lopes L, Ferreira Rodrigues F, Ferreres Sole S, Ferrillo M, Ferro-Luzzi M, Filippov S, Fini R A, Fiorini M, Firlej M, Fischer K M, Fitzpatrick C, Fiutowski T, Fleuret F, Fontana M, Fontanelli F, Forty R, Franco Lima V, Franco Sevilla M, Frank M, Frei C, Friday D A, Fu J, Fuehring M, Funk W, Gabriel E, Gallas Torreira A, Galli D, Gallorini S, Gambetta S, Gan Y, Gandelman M, Gandini P, Gao Y, Garcia Martin L M, García Pardiñas J, Garcia Plana B, Garcia Rosales F A, Garra Tico J, Garrido L, Gascon D, Gaspar C, Gerick D, Gersabeck E, Gersabeck M, Gershon T, Gerstel D, Ghez Ph, Gibson V, Gioventù A, Girard O G, Gironella Gironell P, Giubega L, Giugliano C, Gizdov K, Gligorov V V, Göbel C, Golubkov D, Golutvin A, Gomes A, Gorbounov P, Gorelov I V, Gotti C, Govorkova E, Grabowski J P, Graciani Diaz R, Grammatico T, Granado Cardoso L A, Graugés E, Graverini E, Graziani G, Grecu A, Greim R, Griffith P, Grillo L, Gruber L, Gruberg Cazon B R, Gu C, Gushchin E, Guth A, Guz Yu, Gys T, Günther P, Hadavizadeh T, Haefeli G, Haen C, Haines S C, Hamilton P M, Han Q, Han X, Hancock T H, Hansmann-Menzemer S, Harnew N, Harrison T, Hart R, Hasse C, Hatch M, He J, Hecker M, Heijhoff K, Heinicke K, Heister A, Hennequin A M, Hennessy K, Henry L, Heuel J, Hicheur A, Hill D, Hilton M, Hopchev P H, Hu J, Hu W, Huang W, Hulsbergen W, Humair T, Hunter R J, Hushchyn M, Hutchcroft D, Hynds D, Ibis P, Idzik M, Ilten P, Inglessi A, Inyakin A, Ivshin K, Jacobsson R, Jakobsen S, Jans E, Jashal B K, Jawahery A, Jevtic V, Jiang F, John M, Johnson D, Jones C R, Jost B, Jurik N, Kandybei S, Karacson M, Kariuki J M, Kazeev N, Kecke M, Keizer F, Kelsey M, Kenzie M, Ketel T, Khanji B, Kharisova A, Kim K E, Kirn T, Kirsebom V S, Klaver S, Klimaszewski K, Koliiev S, Kondybayeva A, Konoplyannikov A, Kopciewicz P, Kopecna R, Koppenburg P, Kostiuk I, Kot O, Kotriakhova S, Kravchuk L, Krawczyk R D, Kreps M, Kress F, Kretzschmar S, Krokovny P, Krupa W, Krzemien W, Kucewicz W, Kucharczyk M, Kudryavtsev V, Kuindersma H S, Kunde G J, Kvaratskheliya T, Lacarrere D, Lafferty G, Lai A, Lancierini D, Lane J J, Lanfranchi G, Langenbruch C, Lantwin O, Latham T, Lazzari F, Lazzeroni C, Le Gac R, Lefèvre R, Leflat A, Leroy O, Lesiak T, Leverington B, Li H, Li X, Li Y, Li Z, Liang X, Lindner R, Lisovskyi V, Liu G, Liu X, Loh D, Loi A, Lomba Castro J, Longstaff I, Lopes J H, Loustau G, Lovell G H, Lu Y, Lucchesi D, Lucio Martinez M, Luo Y, Lupato A, Luppi E, Lupton O, Lusiani A, Lyu X, Maccolini S, Machefert F, Maciuc F, Macko V, Mackowiak P, Maddrell-Mander S, Madhan Mohan L R, Maev O, Maevskiy A, Maisuzenko D, Majewski M W, Malde S, Malecki B, Malinin A, Maltsev T, Malygina H, Manca G, Mancinelli G, Manera Escalero R, Manuzzi D, Marangotto D, Maratas J, Marchand J F, Marconi U, Mariani S, Marin Benito C, Marinangeli M, Marino P, Marks J, Marshall P J, Martellotti G, Martinazzoli L, Martinelli M, Martinez Santos D, Martinez Vidal F, Massafferri A, Materok M, Matev R, Mathad A, Mathe Z, Matiunin V, Matteuzzi C, Mattioli K R, Mauri A, Maurice E, McCann M, Mcconnell L, McNab A, McNulty R, Mead J V, Meadows B, Meaux C, Meier G, Meinert N, Melnychuk D, Meloni S, Merk M, Merli A, Mikhasenko M, Milanes D A, Millard E, Minard M-N, Mineev O, Minzoni L, Mitchell S E, Mitreska B, Mitzel D S, Mödden A, Mogini A, Moise R D, Mombächer T, Monroy I A, Monteil S, Morandin M, Morello G, Morello M J, Moron J, Morris A B, Morris A G, Mountain R, Mu H, Muheim F, Mukherjee M, Mulder M, Müller D, Müller K, Müller V, Murphy C H, Murray D, Muzzetto P, Naik P, Nakada T, Nandakumar R, Nandi A, Nanut T, Nasteva I, Needham M, Neri N, Neubert S, Neufeld N, Newcombe R, Nguyen T D, Nguyen-Mau C, Niel E M, Nieswand S, Nikitin N, Nolte N S, Nunez C, Oblakowska-Mucha A, Obraztsov V, Ogilvy S, O'Hanlon D P, Oldeman R, Onderwater C J G, Osborn J D, Ossowska A, Otalora Goicochea J M, Ovsiannikova T, Owen P, Oyanguren A, Pais P R, Pajero T, Palano A, Palutan M, Panshin G, Papanestis A, Pappagallo M, Pappalardo L L, Pappenheimer C, Parker W, Parkes C, Passaleva G, Pastore A, Patel M, Patrignani C, Pearce A, Pellegrino A, Pepe Altarelli M, Perazzini S, Pereima D, Perret P, Pescatore L, Petridis K, Petrolini A, Petrov A, Petrucci S, Petruzzo M, Pietrzyk B, Pietrzyk G, Pili M, Pinci D, Pinzino J, Pisani F, Piucci A, Placinta V, Playfer S, Plews J, Plo Casasus M, Polci F, Poli Lener M, Poliakova M, Poluektov A, Polukhina N, Polyakov I, Polycarpo E, Pomery G J, Ponce S, Popov A, Popov D, Poslavskii S, Prasanth K, Promberger L, Prouve C, Pugatch V, Puig Navarro A, Pullen H, Punzi G, Qian W, Qin J, Quagliani R, Quintana B, Raab N V, Rabadan Trejo R I, Rachwal B, Rademacker J H, Rama M, Ramos Pernas M, Rangel M S, Ratnikov F, Raven G, Reboud M, Redi F, Reiss F, Remon Alepuz C, Ren Z, Renaudin V, Ricciardi S, Richards S, Rinnert K, Robbe P, Robert A, Rodrigues A B, Rodrigues E, Rodriguez Lopez J A, Roehrken M, Roiser S, Rollings A, Romanovskiy V, Romero Lamas M, Romero Vidal A, Roth J D, Rotondo M, 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机构信息
Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
出版信息
Phys Rev Lett. 2020 Mar 20;124(11):111802. doi: 10.1103/PhysRevLett.124.111802.
Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb^{-1}, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A_{1}(Λ_{b}^{0}→J/ψΣ^{0})/A_{0}(Λ_{b}^{0}→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξ_{b}^{0}→J/ψΛ decay is observed for the first time, allowing for the measurement |A_{0}(Ξ_{b}^{0}→J/ψΛ)/A_{1/2}(Ξ_{b}^{0}→J/ψΞ^{0})|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.
强子衰变中同位旋振幅的比值是研究弱相互作用和强相互作用之间相互作用的有用探针，并且有助于寻找超出标准模型的物理现象。我们给出了b重子衰变中同位旋振幅的首批结果，使用的是对应于8.5 fb⁻¹积分亮度的数据，这些数据是在大型强子对撞机底夸克探测器（LHCb探测器）于质心能量为7、8和13 TeV的质子-质子碰撞中收集的。同位旋振幅比|A₁(Λb⁰→J/ψΣ⁰)/A₀(Λb⁰→J/ψΛ)|（其中A的下标表示末态同位旋）在95%置信水平下测得小于1/21.8。首次观测到卡比博压低的Ξb⁰→J/ψΛ衰变，从而得以测量|A₀(Ξb⁰→J/ψΛ)/A₁/₂(Ξb⁰→J/ψΞ⁰)| = 0.37±0.06±0.02，其中不确定性分别为统计不确定性和系统不确定性。
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