对两个新的激发态Ξₓᵇ⁰衰变为Λₓᵇ⁰K⁻π⁺的观测
Observation of Two New Excited Ξ_{b}^{0} States Decaying to Λ_{b}^{0}K^{-}π^{+}.
作者信息
Aaij R, Abdelmotteleb A S W, Abellán Beteta C, Ackernley T, Adeva B, Adinolfi M, Afsharnia H, Agapopoulou C, Aidala C A, Aiola S, Ajaltouni Z, Akar S, Albrecht J, Alessio F, Alexander M, Alfonso Albero A, Aliouche Z, Alkhazov G, Alvarez Cartelle P, Amato S, Amey J L, Amhis Y, An L, Anderlini L, Andreianov A, Andreotti M, Archilli F, Artamonov A, Artuso M, Arzymatov K, Aslanides E, Atzeni M, Audurier B, Bachmann S, Bachmayer M, Back J J, Baladron Rodriguez P, Balagura V, Baldini W, Baptista Leite J, Barbetti M, Barlow R J, Barsuk S, Barter W, Bartolini M, Baryshnikov F, Basels J M, Bashir S, Bassi G, Batsukh B, Battig A, Bay A, Beck A, Becker M, Bedeschi F, Bediaga I, Beiter A, Belavin V, Belin S, Bellee V, Belous K, Belov I, Belyaev I, Bencivenni G, Ben-Haim E, Berezhnoy A, Bernet R, Berninghoff D, Bernstein H C, Bertella C, Bertolin A, Betancourt C, Betti F, Bezshyiko Ia, Bhasin S, Bhom J, Bian L, Bieker M S, Bifani S, Billoir P, Birch M, Bishop F C R, Bitadze A, Bizzeti A, Bjørn M, Blago M P, Blake T, Blanc F, Blusk S, Bobulska D, Boelhauve J A, Boente Garcia O, Boettcher T, Boldyrev A, Bondar A, Bondar N, Borghi S, Borisyak M, Borsato M, Borsuk J T, Bouchiba S A, Bowcock T J V, Boyer A, Bozzi C, Bradley M J, Braun S, Brea Rodriguez A, Brodski M, Brodzicka J, Brossa Gonzalo A, Brundu D, Buonaura A, Buonincontri L, Burke A T, Burr C, Bursche A, Butkevich A, Butter J S, Buytaert J, Byczynski W, Cadeddu S, Cai H, Calabrese R, Calefice L, Calero Diaz L, Cali S, Calladine R, Calvi M, Calvo Gomez M, Camargo Magalhaes P, Campana P, Campoverde Quezada A F, Capelli S, Capriotti L, Carbone A, Carboni G, Cardinale R, Cardini A, Carli I, Carniti P, Carus L, Carvalho Akiba K, Casais Vidal A, Casse G, Cattaneo M, Cavallero G, Celani S, Cerasoli J, Cervenkov D, Chadwick A J, Chapman M G, Charles M, Charpentier Ph, Chatzikonstantinidis G, Chavez Barajas C A, Chefdeville M, Chen C, Chen S, Chernov A, Chobanova V, Cholak S, Chrzaszcz M, Chubykin A, Chulikov V, Ciambrone P, Cicala M F, Cid Vidal X, Ciezarek G, 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, Congedo L, Contu A, Cooke N, Coombs G, Corredoira I, Corti G, Costa Sobral C M, Couturier B, Craik D C, Crkovská J, Cruz Torres M, Currie R, Da Silva C L, Dadabaev S, Dai L, Dall'Occo E, Dalseno J, D'Ambrosio C, Danilina A, d'Argent P, Davies J E, 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 D, De Simone P, de Vries J A, Dean C T, Decamp D, Dedu V, Del Buono L, Delaney B, Dembinski H-P, Dendek A, Denysenko V, Derkach D, Deschamps O, Desse F, Dettori F, Dey B, Di Cicco A, Di Nezza P, Didenko S, Dieste Maronas L, Dijkstra H, Dobishuk V, Dong C, Donohoe A M, Dordei F, Dos Reis A C, Douglas L, Dovbnya A, Downes A G, Dudek M W, Dufour L, Duk V, Durante P, Durham J M, Dutta D, Dziurda A, Dzyuba A, Easo S, Egede U, Egorychev V, Eidelman S, Eisenhardt S, Ek-In S, Eklund L, Ely S, Ene A, Epple E, Escher S, Eschle J, Esen S, Evans T, Falabella A, Fan J, Fan Y, Fang B, Farry S, Fazzini D, Féo M, Fernandez Prieto A, Fernez A D, 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, Fitzgerald D S, Fitzpatrick C, Fiutowski T, Fkiaras A, Fleuret F, Fontana M, Fontanelli F, Forty R, Foulds-Holt D, Franco Lima V, Franco Sevilla M, Frank M, Franzoso E, Frau G, Frei C, Friday D A, Fu J, Fuehring Q, Gabriel E, Gallas Torreira A, Galli D, Gambetta S, Gan Y, Gandelman M, Gandini P, Gao Y, Garau M, Garcia Martin L M, Garcia Moreno P, García Pardiñas J, Garcia Plana B, Garcia Rosales F A, Garrido L, Gaspar C, Geertsema R E, Gerick D, Gerken L L, Gersabeck E, Gersabeck M, Gershon T, Gerstel D, Ghez Ph, Giambastiani L, Gibson V, Giemza H K, Gilman A L, Giovannetti M, Gioventù A, Gironella Gironell P, Giubega L, Giugliano C, Gizdov K, Gkougkousis E L, Gligorov V V, Göbel C, Golobardes E, Golubkov D, Golutvin A, Gomes A, Gomez Fernandez S, Goncalves Abrantes F, Goncerz M, Gong G, Gorbounov P, Gorelov I V, Gotti C, Govorkova E, Grabowski J P, Grammatico T, Granado Cardoso L A, Graugés E, Graverini E, Graziani G, Grecu A, Greeven L M, Grieser N A, Grillo L, Gromov S, Gruberg Cazon B R, Gu C, Guarise M, Guittiere M, Günther P A, Gushchin E, Guth A, Guz Y, Gys T, Hadavizadeh T, Haefeli G, Haen C, Haimberger J, Halewood-Leagas T, Hamilton P M, Hammerich J P, Han Q, Han X, Hancock T H, Hansmann-Menzemer S, Harnew N, Harrison T, Hasse C, Hatch M, He J, Hecker M, Heijhoff K, Heinicke K, Hennequin A M, Hennessy K, Henry L, Heuel J, Hicheur A, Hill D, Hilton M, Hollitt S E, Hou R, Hou Y, Hu J, Hu J, Hu W, Hu X, Huang W, Huang X, Hulsbergen W, Hunter R J, Hushchyn M, Hutchcroft D, Hynds D, Ibis P, Idzik M, Ilin D, Ilten P, Inglessi A, Ishteev A, Ivshin K, Jacobsson R, Jage H, Jakobsen S, Jans E, Jashal B K, Jawahery A, Jevtic V, Jiang F, John M, Johnson D, Jones C R, Jones T P, Jost B, Jurik N, Kalavan Kadavath S H, Kandybei S, Kang Y, Karacson M, Karpov M, Keizer F, Keller D M, Kenzie M, Ketel T, Khanji B, Kharisova A, Kholodenko S, Kirn T, Kirsebom V S, Kitouni O, Klaver S, Kleijne N, Klimaszewski K, Kmiec M R, Koliiev S, Kondybayeva A, Konoplyannikov A, Kopciewicz P, Kopecna R, Koppenburg P, Korolev M, Kostiuk I, Kot O, Kotriakhova S, Kravchenko P, 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, Lampis A, Lancierini D, Lane J J, Lane R, Lanfranchi G, Langenbruch C, Langer J, Lantwin O, Latham T, Lazzari F, Le Gac R, Lee S H, Lefèvre R, Leflat A, Legotin S, Leroy O, Lesiak T, Leverington B, Li H, Li P, Li S, Li Y, Li Y, Li Z, Liang X, Lin T, Lindner R, Lisovskyi V, Litvinov R, Liu G, Liu H, Liu Q, Liu S, Lobo Salvia A, Loi A, Lomba Castro J, Longstaff I, Lopes J H, Lopez Solino S, Lovell G H, Lu Y, Lucarelli C, Lucchesi D, Luchuk S, Lucio Martinez M, Lukashenko V, Luo Y, Lupato A, Luppi E, Lupton O, Lusiani A, Lyu X, Ma L, Ma R, Maccolini S, Machefert F, Maciuc F, Macko V, Mackowiak P, Maddrell-Mander S, Madejczyk O, Madhan Mohan L R, Maev O, Maevskiy A, Maisuzenko D, Majewski M W, Malczewski J J, Malde S, Malecki B, Malinin A, Maltsev T, Malygina H, Manca G, Mancinelli G, Manuzzi D, Marangotto D, Maratas J, Marchand J F, Marconi U, Mariani S, Marin Benito C, Marinangeli M, Marks J, Marshall A M, Marshall P J, Martelli G, 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, Mauricio J, Mazurek M, McCann M, Mcconnell L, Mcgrath T H, Mchugh N T, McNab A, McNulty R, Mead J V, Meadows B, Meier G, Meinert N, Melnychuk D, Meloni S, Merk M, Merli A, Meyer Garcia L, Mikhasenko M, Milanes D A, Millard E, Milovanovic M, Minard M-N, Minotti A, Minzoni L, Mitchell S E, Mitreska B, Mitzel D S, Mödden A, Mohammed R 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, Mulder M, Müller D, Müller K, Murphy C H, Murray D, Muzzetto P, Naik P, Nakada T, Nandakumar R, Nanut T, Nasteva I, Needham M, Neri I, Neri N, Neubert S, Neufeld N, Newcombe R, Nguyen T D, Nguyen-Mau C, Niel E M, Nieswand S, Nikitin N, Nolte N S, Normand C, Nunez C, Oblakowska-Mucha A, Obraztsov V, Oeser T, O'Hanlon D P, Okamura S, Oldeman R, Oliva F, Olivares M E, Onderwater C J G, O'Neil R H, Ossowska A, Otalora Goicochea J M, Ovsiannikova T, Owen P, Oyanguren A, Padeken K O, Pagare B, Pais P R, Pajero T, Palano A, Palutan M, Pan Y, Panshin G, Papanestis A, Pappagallo M, Pappalardo L L, Pappenheimer C, Parker W, Parkes C, Passalacqua B, Passaleva G, Pastore A, Patel M, Patrignani C, Pawley C J, Pearce A, Pellegrino A, Pepe Altarelli M, Perazzini S, Pereima D, Pereiro Castro A, Perret P, Petric M, Petridis K, Petrolini A, Petrov A, Petrucci S, Petruzzo M, Pham T T H, Philippov A, Pica L, Piccini M, Pietrzyk B, Pietrzyk G, Pili M, Pinci D, Pisani F, Pizzichemi M, P K Resmi, Placinta V, Plews J, Plo Casasus M, Polci F, Poli Lener M, Poliakova M, Poluektov A, Polukhina N, Polyakov I, Polycarpo E, Ponce S, Popov D, Popov S, Poslavskii S, Prasanth K, Promberger L, Prouve C, Pugatch V, Puill V, Pullen H, Punzi G, Qi H, Qian W, Qin J, Qin N, 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, Ribatti R, Ricciardi S, Rinnert K, Robbe P, Robertson G, Rodrigues A B, Rodrigues E, Rodriguez Lopez J A, Rodriguez Rodriguez E R R, Rollings A, Roloff P, Romanovskiy V, Romero Lamas M, Romero Vidal A, Roth J D, Rotondo M, Rudolph M S, Ruf T, Ruiz Fernandez R A, Ruiz Vidal J, Ryzhikov A, 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机构信息
Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Department of Physics, University of Warwick, Coventry, United Kingdom.
出版信息
Phys Rev Lett. 2022 Apr 22;128(16):162001. doi: 10.1103/PhysRevLett.128.162001.
Two narrow resonant states are observed in the Λ_{b}^{0}K^{-}π^{+} mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb^{-1}. The minimal quark content of the Λ_{b}^{0}K^{-}π^{+} system indicates that these are excited Ξ_{b}^{0} baryons. The masses of the Ξ_{b}(6327)^{0} and Ξ_{b}(6333)^{0} states are m[Ξ_{b}(6327)^{0}]=6327.28_{-0.21}^{+0.23}±0.12±0.24 and m[Ξ_{b}(6333)^{0}]=6332.69_{-0.18}^{+0.17}±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41_{-0.27}^{+0.26}±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λ_{b}^{0} mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξ_{b}(6327)^{0}]<2.20(2.56) and Γ[Ξ_{b}(6333)^{0}]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξ_{b}^{0} resonances.
利用大型强子对撞机底夸克实验（LHCb实验）收集的质心能量为13 TeV的质子 - 质子碰撞数据样本，其对应积分亮度为6 fb⁻¹，在Λb⁰K⁻π⁺质量谱中观测到两个窄共振态。Λb⁰K⁻π⁺系统的最小夸克含量表明这些是激发态的Ξb⁰重子。Ξb(6327)⁰和Ξb(6333)⁰态的质量分别为m[Ξb(6327)⁰]=6327.28₋₀.₂₁⁺₀.₂₃±0.12±0.24 MeV和m[Ξb(6333)⁰]=6332.69₋₀.₁₈⁺₀.₁₇±0.03±0.22 MeV，质量分裂为Δm = 5.41₋₀.₂₇⁺₀.₂₆±0.12 MeV，其中不确定性包括统计不确定性、系统不确定性以及由于Λb⁰质量测量引起的不确定性。这些态的测量自然宽度与零一致，在90%（95%）置信水平下，Γ[Ξb(6327)⁰]<2.20(2.56) MeV且Γ[Ξb(6333)⁰]<1.60(1.92) MeV。与无峰（单峰）假设相比，双峰假设的显著性大于九个（五个）高斯标准偏差。新态的质量、宽度和共振结构与一维Ξb⁰共振双重态的预期高度吻合。
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