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. 2015 Aug 14;115(7):072001.
doi: 10.1103/PhysRevLett.115.072001. Epub 2015 Aug 12.

Observation of J/ψp Resonances Consistent with Pentaquark States in Λ_{b}^{0}→J/ψK^{-}p Decays

R Aaij  1 B Adeva  2 M Adinolfi  3 A Affolder  4 Z Ajaltouni  5 S Akar  6 J Albrecht  7 F Alessio  1 M Alexander  8 S Ali  9 G Alkhazov  10 P Alvarez Cartelle  11 A A Alves  12 S Amato  13 S Amerio  14 Y Amhis  15 L An  16 L Anderlini  17 J Anderson  18 G Andreassi  19 M Andreotti  20 J E Andrews  21 R B Appleby  22 O Aquines Gutierrez  23 F Archilli  1 P d'Argent  24 A Artamonov  25 M Artuso  26 E Aslanides  6 G Auriemma  27 M Baalouch  5 S Bachmann  24 J J Back  28 A Badalov  29 C Baesso  30 W Baldini  20   1 R J Barlow  22 C Barschel  1 S Barsuk  15 W Barter  1 V Batozskaya  31 V Battista  19 A Bay  19 L Beaucourt  32 J Beddow  8 F Bedeschi  33 I Bediaga  34 L J Bel  9 V Bellee  19 N Belloli  35 I Belyaev  36 E Ben-Haim  37 G Bencivenni  38 S Benson  1 J Benton  3 A Berezhnoy  39 R Bernet  18 A Bertolin  14 M-O Bettler  1 M van Beuzekom  9 A Bien  24 S Bifani  40 P Billoir  37 T Bird  22 A Birnkraut  7 A Bizzeti  17 T Blake  28 F Blanc  19 J Blouw  23 S Blusk  26 V Bocci  27 A Bondar  41 N Bondar  10   1 W Bonivento  42 S Borghi  22 M Borsato  15 T J V Bowcock  4 E Bowen  18 C Bozzi  20 S Braun  24 M Britsch  23 T Britton  26 J Brodzicka  22 N H Brook  3 A Bursche  18 J Buytaert  1 S Cadeddu  42 R Calabrese  20 M Calvi  35 M Calvo Gomez  29 P Campana  38 D Campora Perez  1 L Capriotti  22 A Carbone  43 G Carboni  44 R Cardinale  45 A Cardini  42 P Carniti  35 L Carson  46 K Carvalho Akiba  13   1 G Casse  4 L Cassina  35 L Castillo Garcia  1 M Cattaneo  1 Ch Cauet  7 G Cavallero  45 R Cenci  33 M Charles  37 Ph Charpentier  1 M Chefdeville  32 S Chen  22 S-F Cheung  47 N Chiapolini  18 M Chrzaszcz  18 X Cid Vidal  1 G Ciezarek  9 P E L Clarke  46 M Clemencic  1 H V Cliff  48 J Closier  1 V Coco  1 J Cogan  6 E Cogneras  5 V Cogoni  42 L Cojocariu  49 G Collazuol  14 P Collins  1 A Comerma-Montells  24 A Contu  42   1 A Cook  3 M Coombes  3 S Coquereau  37 G Corti  1 M Corvo  20 B Couturier  1 G A Cowan  46 D C Craik  28 A Crocombe  28 M Cruz Torres  30 S Cunliffe  11 R Currie  11 C D'Ambrosio  1 E Dall'Occo  9 J Dalseno  3 P N Y David  9 A Davis  12 K De Bruyn  9 S De Capua  22 M De Cian  24 J M De Miranda  34 L De Paula  13 P De Simone  38 C-T Dean  8 D Decamp  32 M Deckenhoff  7 L Del Buono  37 N Déléage  32 M Demmer  7 D Derkach  47 O Deschamps  5 F Dettori  1 B Dey  50 A Di Canto  1 F Di Ruscio  44 H Dijkstra  1 S Donleavy  4 F Dordei  24 M Dorigo  19 A Dosil Suárez  2 D Dossett  28 A Dovbnya  51 K Dreimanis  4 L Dufour  9 G Dujany  22 F Dupertuis  19 P Durante  1 R Dzhelyadin  25 A Dziurda  52 A Dzyuba  10 S Easo  1   53 U Egede  11 V Egorychev  36 S Eidelman  41 S Eisenhardt  46 U Eitschberger  7 R Ekelhof  7 L Eklund  8 I El Rifai  5 Ch Elsasser  18 S Ely  26 S Esen  24 H M Evans  48 T Evans  47 A Falabella  43 C Färber  1 N Farley  40 S Farry  4 R Fay  4 D Ferguson  46 V Fernandez Albor  2 F Ferrari  43 F Ferreira Rodrigues  34 M Ferro-Luzzi  1 S Filippov  54 M Fiore  20   1 M Fiorini  20 M Firlej  55 C Fitzpatrick  19 T Fiutowski  55 K Fohl  1 P Fol  11 M Fontana  42 F Fontanelli  45 R Forty  1 O Francisco  13 M Frank  1 C Frei  1 M Frosini  17 J Fu  50 E Furfaro  44 A Gallas Torreira  2 D Galli  43 S Gallorini  14   1 S Gambetta  46 M Gandelman  13 P Gandini  47 Y Gao  16 J García Pardiñas  2 J Garra Tico  48 L Garrido  29 D Gascon  29 C Gaspar  1 R Gauld  47 L Gavardi  7 G Gazzoni  5 A Geraci  50 D Gerick  24 E Gersabeck  24 M Gersabeck  22 T Gershon  28 Ph Ghez  32 A Gianelle  14 S Gianì  19 V Gibson  48 O G Girard  19 L Giubega  49 V V Gligorov  1 C Göbel  30 D Golubkov  36 A Golutvin  36   1   11 A Gomes  34 C Gotti  35 M Grabalosa Gándara  5 R Graciani Diaz  29 L A Granado Cardoso  1 E Graugés  29 E Graverini  18 G Graziani  17 A Grecu  49 E Greening  47 S Gregson  48 P Griffith  40 L Grillo  24 O Grünberg  56 B Gui  26 E Gushchin  54 Yu Guz  25   1 T Gys  1 T Hadavizadeh  47 C Hadjivasiliou  26 G Haefeli  19 C Haen  1 S C Haines  48 S Hall  11 B Hamilton  21 X Han  24 S Hansmann-Menzemer  24 N Harnew  47 S T Harnew  3 J Harrison  22 J He  1 T Head  19 V Heijne  9 K Hennessy  4 P Henrard  5 L Henry  37 J A Hernando Morata  2 E van Herwijnen  1 M Heß  56 A Hicheur  13 D Hill  47 M Hoballah  5 C Hombach  22 W Hulsbergen  9 T Humair  11 N Hussain  47 D Hutchcroft  4 D Hynds  8 M Idzik  55 P Ilten  57 R Jacobsson  1 A Jaeger  24 J Jalocha  47 E Jans  9 A Jawahery  21 F Jing  16 M John  47 D Johnson  1 C R Jones  48 C Joram  1 B Jost  1 N Jurik  26 S Kandybei  51 W Kanso  6 M Karacson  1 T M Karbach  1 S Karodia  8 M Kecke  24 M Kelsey  26 I R Kenyon  40 M Kenzie  1 T Ketel  58 B Khanji  35   1 C Khurewathanakul  19 S Klaver  22 K Klimaszewski  31 O Kochebina  15 M Kolpin  24 I Komarov  19 R F Koopman  58 P Koppenburg  1   9 M Kozeiha  5 L Kravchuk  54 K Kreplin  24 M Kreps  28 G Krocker  24 P Krokovny  41 F Kruse  7 W Krzemien  31 W Kucewicz  52 M Kucharczyk  52 V Kudryavtsev  41 A K Kuonen  19 K Kurek  31 T Kvaratskheliya  36 D Lacarrere  1 G Lafferty  22 A Lai  42 D Lambert  46 G Lanfranchi  38 C Langenbruch  28 B Langhans  1 T Latham  28 C Lazzeroni  40 R Le Gac  6 J van Leerdam  9 J-P Lees  32 R Lefèvre  5 A Leflat  39   1 J Lefrançois  15 O Leroy  6 T Lesiak  52 B Leverington  24 Y Li  15 T Likhomanenko  59   60 M Liles  4 R Lindner  1 C Linn  1 F Lionetto  18 B Liu  42 X Liu  16 D Loh  28 I Longstaff  8 J H Lopes  13 D Lucchesi  14 M Lucio Martinez  2 H Luo  46 A Lupato  14 E Luppi  20 O Lupton  47 N Lusardi  50 A Lusiani  33 F Machefert  15 F Maciuc  49 O Maev  10 K Maguire  22 S Malde  47 A Malinin  59 G Manca  15 G Mancinelli  6 P Manning  26 A Mapelli  1 J Maratas  5 J F Marchand  32 U Marconi  43 C Marin Benito  29 P Marino  33   1 J Marks  24 G Martellotti  27 M Martin  6 M Martinelli  19 D Martinez Santos  2 F Martinez Vidal  61 D Martins Tostes  13 A Massafferri  34 R Matev  1 A Mathad  28 Z Mathe  1 C Matteuzzi  35 A Mauri  18 B Maurin  19 A Mazurov  40 M McCann  11 J McCarthy  40 A McNab  22 R McNulty  62 B Meadows  12 F Meier  7 M Meissner  24 D Melnychuk  31 M Merk  9 D A Milanes  63 M-N Minard  32 D S Mitzel  24 J Molina Rodriguez  30 I A Monroy  63 S Monteil  5 M Morandin  14 P Morawski  55 A Mordà  6 M J Morello  33 J Moron  55 A B Morris  46 R Mountain  26 F Muheim  46 J Müller  7 K Müller  18 V Müller  7 M Mussini  43 B Muster  19 P Naik  3 T Nakada  19 R Nandakumar  53 A Nandi  47 I Nasteva  13 M Needham  46 N Neri  50 S Neubert  24 N Neufeld  1 M Neuner  24 A D Nguyen  19 T D Nguyen  19 C Nguyen-Mau  19 V Niess  5 R Niet  7 N Nikitin  39 T Nikodem  24 D Ninci  33 A Novoselov  25 D P O'Hanlon  28 A Oblakowska-Mucha  55 V Obraztsov  25 S Ogilvy  8 O Okhrimenko  64 R Oldeman  42 C J G Onderwater  65 B Osorio Rodrigues  34 J M Otalora Goicochea  13 A Otto  1 P Owen  11 A Oyanguren  61 A Palano  66 F Palombo  50 M Palutan  38 J Panman  1 A Papanestis  53 M Pappagallo  8 L L Pappalardo  20 C Pappenheimer  12 C Parkes  22 G Passaleva  17 G D Patel  4 M Patel  11 C Patrignani  45 A Pearce  53   22 A Pellegrino  9 G Penso  27 M Pepe Altarelli  1 S Perazzini  43 P Perret  5 L Pescatore  40 K Petridis  3 A Petrolini  45 M Petruzzo  50 E Picatoste Olloqui  29 B Pietrzyk  32 T Pilař  28 D Pinci  27 A Pistone  45 A Piucci  24 S Playfer  46 M Plo Casasus  2 T Poikela  1 F Polci  37 A Poluektov  41   28 I Polyakov  36 E Polycarpo  13 A Popov  25 D Popov  23   1 B Popovici  49 C Potterat  13 E Price  3 J D Price  4 J Prisciandaro  19 A Pritchard  4 C Prouve  3 V Pugatch  64 A Puig Navarro  19 G Punzi  33 W Qian  32 R Quagliani  15   3 B Rachwal  52 J H Rademacker  3 M Rama  33 M S Rangel  13 I Raniuk  51 N Rauschmayr  1 G Raven  58 F Redi  11 S Reichert  22 M M Reid  28 A C Dos Reis  34 S Ricciardi  53 S Richards  3 M Rihl  1 K Rinnert  4 V Rives Molina  29 P Robbe  15   1 A B Rodrigues  34 E Rodrigues  22 J A Rodriguez Lopez  63 P Rodriguez Perez  22 S Roiser  1 V Romanovsky  25 A Romero Vidal  2 J W Ronayne  62 M Rotondo  14 J Rouvinet  19 T Ruf  1 P Ruiz Valls  61 J J Saborido Silva  2 N Sagidova  10 P Sail  8 B Saitta  42 V Salustino Guimaraes  13 C Sanchez Mayordomo  61 B Sanmartin Sedes  2 R Santacesaria  27 C Santamarina Rios  2 M Santimaria  38 E Santovetti  44 A Sarti  38 C Satriano  27 A Satta  44 D M Saunders  3 D Savrina  36   39 M Schiller  1 H Schindler  1 M Schlupp  7 M Schmelling  23 T Schmelzer  7 B Schmidt  1 O Schneider  19 A Schopper  1 M Schubiger  19 M-H Schune  15 R Schwemmer  1 B Sciascia  38 A Sciubba  27 A Semennikov  36 N Serra  18 J Serrano  6 L Sestini  14 P Seyfert  35 M Shapkin  25 I Shapoval  20   51 Y Shcheglov  10 T Shears  4 L Shekhtman  41 V Shevchenko  59 A Shires  7 B G Siddi  20 R Silva Coutinho  28 G Simi  14 M Sirendi  48 N Skidmore  3 I Skillicorn  8 T Skwarnicki  26 E Smith  53   47 E Smith  11 I T Smith  46 J Smith  48 M Smith  22 H Snoek  9 M D Sokoloff  1   12 F J P Soler  8 F Soomro  19 D Souza  3 B Souza De Paula  13 B Spaan  7 P Spradlin  8 S Sridharan  1 F Stagni  1 M Stahl  24 S Stahl  1 S Stefkova  11 O Steinkamp  18 O Stenyakin  25 S Stevenson  47 S Stoica  49 S Stone  26 B Storaci  18 S Stracka  33 M Straticiuc  49 U Straumann  18 L Sun  12 W Sutcliffe  11 K Swientek  55 S Swientek  7 V Syropoulos  58 M Szczekowski  31 P Szczypka  1   19 T Szumlak  55 S T'Jampens  32 A Tayduganov  6 T Tekampe  7 M Teklishyn  15 G Tellarini  20 F Teubert  1 C Thomas  47 E Thomas  1 J van Tilburg  9 V Tisserand  32 M Tobin  19 J Todd  12 S Tolk  58 L Tomassetti  20 D Tonelli  1 S Topp-Joergensen  47 N Torr  47 E Tournefier  32 S Tourneur  19 K Trabelsi  19 M T Tran  19 M Tresch  18 A Trisovic  1 A Tsaregorodtsev  6 P Tsopelas  9 N Tuning  1   9 A Ukleja  31 A Ustyuzhanin  59   60 U Uwer  24 C Vacca  42 V Vagnoni  43 G Valenti  43 A Vallier  15 R Vazquez Gomez  38 P Vazquez Regueiro  2 C Vázquez Sierra  2 S Vecchi  20 J J Velthuis  3 M Veltri  17 G Veneziano  19 M Vesterinen  24 B Viaud  15 D Vieira  13 M Vieites Diaz  2 X Vilasis-Cardona  29 A Vollhardt  18 D Volyanskyy  23 D Voong  3 A Vorobyev  10 V Vorobyev  41 C Voß  56 J A de Vries  9 R Waldi  56 C Wallace  28 R Wallace  62 J Walsh  33 S Wandernoth  24 J Wang  26 D R Ward  48 N K Watson  40 D Websdale  11 A Weiden  18 M Whitehead  28 G Wilkinson  1   47 M Wilkinson  26 M Williams  1 M P Williams  40 M Williams  57 T Williams  40 F F Wilson  53 J Wimberley  21 J Wishahi  7 W Wislicki  31 M Witek  52 G Wormser  15 S A Wotton  48 S Wright  48 K Wyllie  1 Y Xie  67 Z Xu  19 Z Yang  16 J Yu  67 X Yuan  41 O Yushchenko  25 M Zangoli  43 M Zavertyaev  23 L Zhang  16 Y Zhang  16 A Zhelezov  24 A Zhokhov  36 L Zhong  16 S Zucchelli  43 LHCb Collaboration
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Free article

Observation of J/ψp Resonances Consistent with Pentaquark States in Λ_{b}^{0}→J/ψK^{-}p Decays

R Aaij et al. Phys Rev Lett. .
Free article

Abstract

Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ_{b}^{0}→J/ψK^{-}p decays are presented. The data sample corresponds to an integrated luminosity of 3 fb^{-1} acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis of the three-body final state reproduces the two-body mass and angular distributions. To obtain a satisfactory fit of the structures seen in the J/ψp mass spectrum, it is necessary to include two Breit-Wigner amplitudes that each describe a resonant state. The significance of each of these resonances is more than 9 standard deviations. One has a mass of 4380±8±29 MeV and a width of 205±18±86 MeV, while the second is narrower, with a mass of 4449.8±1.7±2.5 MeV and a width of 39±5±19 MeV. The preferred J^{P} assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.

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  • Observation of the Λ b 0 J / ψ Ξ - K + decay.
    CMS Collaboration; Hayrapetyan A, Tumasyan A, Adam W, Andrejkovic JW, Bergauer T, Chatterjee S, Damanakis K, Dragicevic M, Valle AED, Hussain PS, Jeitler M, Krammer N, Liko D, Mikulec I, Schieck J, Schöfbeck R, Schwarz D, Sonawane M, Templ S, Waltenberger W, Wulz CE, Darwish MR, Janssen T, Mechelen PV, Bols ES, D'Hondt J, Dansana S, De Moor A, Delcourt M, El Faham H, Lowette S, Makarenko I, Müller D, Sahasransu AR, Tavernier S, Tytgat M, Van Putte S, Vannerom D, Clerbaux B, De Lentdecker G, Favart L, Hohov D, Jaramillo J, Khalilzadeh A, Lee K, Mahdavikhorrami M, Malara A, Paredes S, Pétré L, Postiau N, Thomas L, Bemden MV, Velde CV, Vanlaer P, De Coen M, Dobur D, Hong Y, Knolle J, Lambrecht L, Mestdach G, Rendón C, Samalan A, Skovpen K, Bossche NVD, Wezenbeek L, Benecke A, Bruno G, Caputo C, Delaere C, Donertas IS, Giammanco A, Jaffel K, Jain S, Lemaitre V, Lidrych J, Mastrapasqua P, Mondal K, Tran TT, Wertz S, Alves GA, Coelho E, Hensel C, De Oliveira TM, Moraes A, Teles PR, Soeiro M, Júnior WLA, Pereira MAG, Filho MBF, Malbouisson HB, Carvalho W, Chinellato J, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Souza SF, Martins J, Herrera CM, Amarilo KM, Mundim L, Nogima H, Sant… See abstract for full author list ➔ CMS Collaboration, et al. Eur Phys J C Part Fields. 2024;84(10):1062. doi: 10.1140/epjc/s10052-024-13114-9. Epub 2024 Oct 15. Eur Phys J C Part Fields. 2024. PMID: 39422214 Free PMC article.
  • Masses of Hadrons, Tetraquarks, and Pentaquarks Through a Tsallis-Entropy Approach in the MIT Bag Model.
    Fernández V, Corral GH, Astorga MAM, Sáenz JM. Fernández V, et al. Entropy (Basel). 2025 Jun 26;27(7):681. doi: 10.3390/e27070681. Entropy (Basel). 2025. PMID: 40724397 Free PMC article.
  • Evidence for an η c ( 1 S ) π - resonance in B 0 η c ( 1 S ) K + π - decays.
    Aaij R, Beteta CA, Adeva B, Adinolfi M, Aidala CA, Ajaltouni Z, Akar S, Albicocco P, Albrecht J, Alessio F, Alexander M, Albero AA, Alkhazov G, Alvarez Cartelle P, Alves AA Jr, Amato S, Amerio S, Amhis Y, An L, Anderlini L, Andreassi G, Andreotti M, Andrews JE, Appleby RB, Archilli F, d'Argent P, Arnau Romeu J, Artamonov A, Artuso M, Arzymatov K, Aslanides E, Atzeni M, Audurier B, Bachmann S, Back JJ, Baker S, Balagura V, Baldini W, Baranov A, Barlow RJ, Barsuk S, Barter W, Baryshnikov F, Batozskaya V, Batsukh B, Battig A, Battista V, Bay A, Beddow J, Bedeschi F, Bediaga I, Beiter A, Bel LJ, Belin S, Beliy N, Bellee V, Belloli N, Belous K, Belyaev I, Ben-Haim E, Bencivenni G, Benson S, Beranek S, Berezhnoy A, Bernet R, Berninghoff D, Bertholet E, Bertolin A, Betancourt C, Betti F, Bettler MO, van Beuzekom M, Bezshyiko I, Bhasin S, Bhom J, Bifani S, Billoir P, Birnkraut A, Bizzeti A, Bjørn M, Blago MP, Blake T, Blanc F, Blusk S, Bobulska D, Bocci V, Garcia OB, Boettcher T, Bondar A, Bondar N, Borghi S, Borisyak M, Borsato M, Bossu F, Boubdir M, Bowcock TJV, Bozzi C, Braun S, Brodski M, Brodzicka J, Gonzalo AB, Brundu D, Buchanan E, Buonaura A, Burr C, Bursche A, Buytaert J, Byczyns… See abstract for full author list ➔ Aaij R, et al. Eur Phys J C Part Fields. 2018;78(12):1019. doi: 10.1140/epjc/s10052-018-6447-z. Epub 2018 Dec 17. Eur Phys J C Part Fields. 2018. PMID: 30872960 Free PMC article.
  • Study of the doubly charmed tetraquark T c c + .
    LHCb collaboration. LHCb collaboration. Nat Commun. 2022 Jun 16;13(1):3351. doi: 10.1038/s41467-022-30206-w. Nat Commun. 2022. PMID: 35710739 Free PMC article.
  • Searching for the rules that govern hadron construction.
    Shepherd MR, Dudek JJ, Mitchell RE. Shepherd MR, et al. Nature. 2016 Jun 23;534(7608):487-93. doi: 10.1038/nature18011. Nature. 2016. PMID: 27337337