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  Observation of structure in the J/ψ-pair mass spectrum

LHCb Collaboration, Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C. A., et al. (2020). Observation of structure in the J/ψ-pair mass spectrum. Science Bulletin, 65(23), 1983-1993. doi:10.1016/j.scib.2020.08.032.

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LHCb Collaboration, Author              
Aaij, R., Author
Abellan Beteta, C.1, Author
Adeva, B.1, Author
Adinolfi, M.1, Author
Aidala, C. A.1, Author
Ajaltouni, Z.1, Author
Akar, S.1, Author
Albicocco, P.1, Author
Albrecht, J.1, Author
Alessio, F.1, Author
Alexander, M.1, Author
Albero, A. Alfonso1, Author
Alkhazov, G.1, Author
Cartelle, P. Alvarez1, Author
Alves Jr., A. A.1, Author
Amato, S.1, Author
Amerio, S.1, Author
Amhis, Y.1, Author
An, L.1, Author
Anderlini, L.1, AuthorAndreassi, G.1, AuthorAndreotti, M.1, AuthorAndrews, J. E.1, AuthorArchilli, F.1, Authord'Argent, P.1, AuthorRomeu, J. Arnau1, AuthorArtamonov, A.1, AuthorArtuso, M.1, AuthorArzymatov, K.1, AuthorAslanides, E.1, AuthorAtzeni, M.1, AuthorAudurier, B.1, AuthorBachmann, S.1, AuthorBack, J. J.1, AuthorBaker, S.1, AuthorBalagura, V.1, AuthorBaldini, W.1, AuthorBaranov, A.1, AuthorBarlow, R. J.1, AuthorBarrand, G. C.1, AuthorBarsuk, S.1, AuthorBarter, W.1, AuthorBartolini, M.1, AuthorBaryshnikov, F.1, AuthorBatozskaya, V.1, AuthorBatsukh, B.1, AuthorBattig, A.1, AuthorBattista, V.1, AuthorBay, A.1, AuthorBeddow, J.1, AuthorBedeschi, F.1, AuthorBediaga, I.1, AuthorBeiter, A.1, AuthorBel, L. J.1, AuthorBelin, S.1, AuthorBeliy, N.1, AuthorBellee, V.1, AuthorBelloli, N.1, AuthorBelous, K.1, AuthorBelyaev, I.1, AuthorBen-Haim, E.1, AuthorBencivenni, G.1, AuthorBenson, S.1, AuthorBeranek, S.1, AuthorBerezhnoy, A.1, AuthorBernet, R.1, AuthorBerninghoff, D.1, AuthorBertholet, E.1, AuthorBertolin, A.1, AuthorBetancourt, C.1, AuthorBetti, F.1, AuthorBettler, M. O.1, Authorvan Beuzekom, M.1, AuthorBezshyiko, Ia.1, AuthorBhasin, S.1, AuthorBhom, J.1, AuthorBifani, S.1, AuthorBilloir, P.1, AuthorBirnkraut, A.1, AuthorBizzeti, A.1, AuthorBjorn, M.1, AuthorBlago, M. P.1, AuthorBlake, T.1, AuthorBlanc, F.1, AuthorBlusk, S.1, AuthorBobulska, D.1, AuthorBocci, V.1, AuthorBoente Garcia, O.1, AuthorBoettcher, T.1, AuthorBondar, A.1, AuthorBondar, N.1, AuthorBorghi, S.1, AuthorBorisyak, M.1, AuthorBorsato, M.1, AuthorBossu, F.1, AuthorBoubdir, M.1, AuthorBowcock, T. J. V.1, AuthorBozzi, C.1, AuthorBraun, S.1, AuthorBrodski, M.1, AuthorBrodzicka, J.1, AuthorGonzalo, A. Brossa1, AuthorBrundu, D.1, AuthorBuchanan, E.1, AuthorBuonaura, A.1, AuthorBurr, C.1, AuthorBursche, A.1, AuthorBuytaert, J.1, AuthorByczynski, W.1, AuthorCadeddu, S.1, AuthorCai, H.1, AuthorCalabrese, R.1, AuthorCalladine, R.1, AuthorCalvi, M.1, AuthorCalvo Gomez, M.1, AuthorCamboni, A.1, AuthorCampana, P.1, AuthorPerez, D. H. Campora1, AuthorCapriotti, L.1, AuthorCarbone, A.1, AuthorCarboni, G.1, AuthorCardinale, R.1, AuthorCardini, A.1, AuthorCarniti, P.1, AuthorCarvalho Akiba, K.1, AuthorCasse, G.1, AuthorCassina, L.1, AuthorCattaneo, M.1, AuthorCavallero, G.1, AuthorCenci, R.1, AuthorChamont, D.1, AuthorChapman, M. G.1, AuthorCharles, M.1, AuthorCharpentier, Ph.1, AuthorChatzikonstantinidis, G.1, AuthorChefdeville, M.1, AuthorChekalina, V.1, AuthorChen, C.1, AuthorChen, S.1, AuthorChitic, S. -G.1, AuthorChobanova, V.1, AuthorChrzaszcz, M.1, AuthorChubykin, A.1, AuthorCiambrone, P.1, AuthorCid Vidal, X.1, AuthorCiezarek, G.1, AuthorCindolo, F.1, AuthorClarke, P. E. L.1, AuthorClemencic, M.1, AuthorCliff, H. V.1, AuthorClosier, J.1, AuthorCoco, V.1, AuthorCoelho, J. A. B.1, AuthorCogan, J.1, AuthorCogneras, E.1, AuthorCojocariu, L.1, AuthorCollins, P.1, AuthorColombo, T.1, AuthorComerma-Montells, A.1, AuthorContu, A.1, AuthorCoombs, G.1, AuthorCoquereau, S.1, AuthorCorti, G.1, AuthorCorvo, M.1, AuthorSobral, C. M. Costa1, AuthorCouturier, B.1, AuthorCowan, G. A.1, AuthorCraik, D. C.1, AuthorCrocombe, A.1, AuthorCruz Torres, M.1, AuthorCurrie, R.1, AuthorD'Ambrosio, C.1, AuthorDa Cunha Marinho, F.1, AuthorDa Silva, C. L.1, AuthorDall'Occo, E.1, AuthorDalseno, J.1, AuthorDanilina, A.1, AuthorDavis, A.1, AuthorFrancisco, O. De Aguiar1, AuthorDe Bruyn, K.1, AuthorDe Capua, S.1, AuthorDe Cian, M.1, AuthorDe Miranda, J. M.1, AuthorDe Paula, L.1, AuthorDe Serio, M.1, AuthorDe Simone, P.1, AuthorDean, C. T.1, AuthorDecamp, D.1, AuthorDel Buono, L.1, AuthorDelaney, B.1, AuthorDembinski, H. -P.1, AuthorDemmer, M.1, AuthorDendek, A.1, AuthorDerkach, D.1, AuthorDeschamps, O.1, AuthorDesse, F.1, AuthorDettori, F.1, AuthorDey, B.1, AuthorDi Canto, A.1, AuthorDi Nezza, P.1, AuthorDidenko, S.1, AuthorDijkstra, H.1, AuthorDordei, F.1, AuthorDorigo, M.1, AuthorDosil Suarez, A.1, AuthorDouglas, L.1, AuthorDovbnya, A.1, AuthorDreimanis, K.1, AuthorDufour, L.1, AuthorDujany, G.1, AuthorDurante, P.1, AuthorDurham, J. M.1, AuthorDutta, D.1, AuthorDzhelyadin, R.1, AuthorDziewiecki, M.1, AuthorDziurda, A.1, AuthorDzyuba, A.1, AuthorEaso, S.1, AuthorEgede, U.1, AuthorEgorychev, V.1, AuthorEidelman, S.1, AuthorEisenhardt, S.1, AuthorEitschberger, U.1, AuthorEkelhof, R.1, AuthorEklund, L.1, AuthorEly, S.1, AuthorEne, A.1, AuthorEscher, S.1, AuthorEsen, S.1, AuthorEvans, T.1, AuthorFalabella, A.1, AuthorFarley, N.1, AuthorFarry, S.1, AuthorFazzini, D.1, AuthorDeclara, P. Fernandez1, AuthorFernandez Prieto, A.1, AuthorFerrari, F.1, AuthorLopes, L. Ferreira1, AuthorFerreira Rodrigues, F.1, AuthorFerro-Luzzi, M.1, AuthorFilippov, S.1, AuthorFini, R. A.1, AuthorFiorini, M.1, AuthorFirlej, M.1, AuthorFitzpatrick, C.1, AuthorFiutowski, T.1, AuthorFleuret, F.1, AuthorFontana, M.1, AuthorFontanelli, F.1, AuthorForty, R.1, AuthorLima, V. Franco1, AuthorFrank, M.1, AuthorFrei, C.1, AuthorFu, J.1, AuthorFunk, W.1, AuthorFarber, C.1, AuthorFeo, M.1, AuthorGabriel, E.1, AuthorGallas Torreira, A.1, AuthorGalli, D.1, AuthorGallorini, S.1, AuthorGambetta, S.1, AuthorGan, Y.1, AuthorGandelman, M.1, AuthorGandini, P.1, AuthorGao, Y.1, AuthorGarcia Martin, L. M.1, AuthorGarcia Plana, B.1, AuthorPardinas, J. Garcia1, AuthorTico, J. Garra1, AuthorGarrido, L.1, AuthorGascon, D.1, AuthorGaspar, C.1, AuthorGavardi, L.1, AuthorGazzoni, G.1, AuthorGerick, D.1, AuthorGersabeck, E.1, AuthorGersabeck, M.1, AuthorGershon, T.1, AuthorGerstel, D.1, AuthorGhez, Ph.1, AuthorGibson, V.1, AuthorGirard, O. G.1, AuthorGironella Gironell, P.1, AuthorGiubega, L.1, AuthorGizdov, K.1, AuthorGligorov, V. V.1, AuthorGolubkov, D.1, AuthorGolutvin, A.1, AuthorGomes, A.1, AuthorGorelov, I. V.1, AuthorGotti, C.1, AuthorGovorkova, E.1, AuthorGrabowski, J. P.1, AuthorGraciani Diaz, R.1, AuthorCardoso, L. A. Granado1, AuthorGrauges, E.1, AuthorGraverini, E.1, AuthorGraziani, G.1, AuthorGrecu, A.1, AuthorGreim, R.1, AuthorGriffith, P.1, AuthorGrillo, L.1, AuthorGruber, L.1, AuthorCazon, B. R. Gruberg1, AuthorGruenberg, O.1, AuthorGu, C.1, AuthorGushchin, E.1, AuthorGuth, A.1, AuthorGuz, Yu.1, AuthorGys, T.1, AuthorGobel, C.1, AuthorHadavizadeh, T.1, AuthorHadjivasiliou, C.1, AuthorHaefeli, G.1, AuthorHaen, C.1, AuthorHaines, S. C.1, AuthorHamilton, B.1, AuthorHan, X.1, AuthorHancock, T. H.1, AuthorHansmann-Menzemer, S.1, AuthorHarnew, N.1, AuthorHarrison, T.1, AuthorHasse, C.1, AuthorHatch, M.1, AuthorHe, J.1, AuthorHecker, M.1, AuthorHeinicke, K.1, AuthorHeister, A.1, AuthorHennessy, K.1, AuthorHenry, L.1, Authorvan Herwijnen, E.1, AuthorHeuel, J.1, AuthorHess, M.1, AuthorHicheur, A.1, AuthorCharman, R. Hidalgo1, AuthorHill, D.1, AuthorHilton, M.1, AuthorHopchev, P. H.1, AuthorHu, J.1, AuthorHu, W.1, AuthorHuang, W.1, AuthorHuard, Z. C.1, AuthorHulsbergen, W.1, AuthorHumair, T.1, AuthorHushchyn, M.1, AuthorHutchcroft, D.1, AuthorHynds, D.1, AuthorIbis, P.1, AuthorIdzik, M.1, AuthorIlten, P.1, AuthorInglessi, A.1, AuthorInyakin, A.1, AuthorIvshin, K.1, AuthorJacobsson, R.1, AuthorJalocha, J.1, AuthorJans, E.1, AuthorJashal, B. K.1, AuthorJawahery, A.1, AuthorJiang, F.1, AuthorJohn, M.1, AuthorJohnson, D.1, AuthorJones, C. R.1, AuthorJoram, C.1, AuthorJost, B.1, AuthorJurik, N.1, AuthorKandybei, S.1, AuthorKaracson, M.1, AuthorKariuki, J. M.1, AuthorKarodia, S.1, AuthorKazeev, N.1, AuthorKecke, M.1, AuthorKeizer, F.1, AuthorKelsey, M.1, AuthorKenzie, M.1, AuthorKetel, T.1, AuthorKhairullin, E.1, AuthorKhanji, B.1, AuthorKhurewathanakul, C.1, AuthorKim, K. E.1, AuthorKirn, T.1, AuthorKirsebom, V. S.1, AuthorKlaver, S.1, AuthorKlimaszewski, K.1, AuthorKlimkovich, T.1, AuthorKoliiev, S.1, AuthorKolpin, M.1, AuthorKopecna, R.1, AuthorKoppenburg, P.1, AuthorKostiuk, I.1, AuthorKotriakhova, S.1, AuthorKozeiha, M.1, AuthorKravchuk, L.1, AuthorKreps, M.1, AuthorKress, F.1, AuthorKrokovny, P.1, AuthorKrupa, W.1, AuthorKrzemien, W.1, AuthorKucewicz, W.1, AuthorKucharczyk, M.1, AuthorKudryavtsev, V.1, AuthorKuonen, A. K.1, AuthorKvaratskheliya, T.1, AuthorLacarrere, D.1, AuthorLafferty, G.1, AuthorLai, A.1, AuthorLancierini, D.1, AuthorLanfranchi, G.1, AuthorLangenbruch, C.1, AuthorLatham, T.1, AuthorLazzeroni, C.1, AuthorLe Gac, R.1, AuthorAt, Le1, AuthorLefevre, R.1, AuthorLemaitre, F.1, AuthorLeroy, O.1, AuthorLesiak, T.1, AuthorLeverington, B.1, AuthorLi, P. -R.1, AuthorLi, Y.1, AuthorLi, Z.1, AuthorLiang, X.1, AuthorLikhomanenko, T.1, AuthorLindner, R.1, AuthorLionetto, F.1, AuthorLisovskyi, V.1, AuthorLiu, G.1, AuthorLiu, X.1, AuthorLoh, D.1, AuthorLoi, A.1, AuthorLongstaff, I.1, AuthorLopes, J. H.1, AuthorLovell, G. H.1, AuthorLucchesi, D.1, AuthorLucio Martinez, M.1, AuthorLupato, A.1, AuthorLuppi, E.1, AuthorLupton, O.1, AuthorLusiani, A.1, AuthorLyu, X.1, AuthorMachefert, F.1, AuthorMaciuc, F.1, AuthorMacko, V.1, AuthorMackowiak, P.1, AuthorMaddrell-Mander, S.1, AuthorMaev, O.1, AuthorMaguire, K.1, AuthorMaisuzenko, D.1, AuthorMajewski, M. W.1, AuthorMalde, S.1, AuthorMalecki, B.1, AuthorMalinin, A.1, AuthorMaltsev, T.1, AuthorManca, G.1, AuthorMancinelli, G.1, AuthorMarangotto, D.1, AuthorMaratas, J.1, AuthorMarchand, J. F.1, AuthorMarconi, U.1, AuthorBenito, C. Marin1, AuthorMarinangeli, M.1, AuthorMarino, P.1, AuthorMarks, J.1, AuthorMarshall, P. J.1, AuthorMartellotti, G.1, AuthorMartinelli, M.1, AuthorMartinez Santos, D.1, AuthorMartinez Vidal, F.1, AuthorMassafferri, A.1, AuthorMaterok, M.1, AuthorMatev, R.1, AuthorMathad, A.1, AuthorMathe, Z.1, AuthorMatteuzzi, C.1, AuthorMauri, A.1, AuthorMaurice, E.1, AuthorMaurin, B.1, AuthorMcCann, M.1, AuthorMcnab, A.1, AuthorMcNulty, R.1, AuthorMead, J. V.1, AuthorMeadows, B.1, AuthorMeaux, C.1, AuthorMeinert, N.1, AuthorMelnychuk, D.1, AuthorMerk, M.1, AuthorMerli, A.1, AuthorMichielin, E.1, AuthorMilanes, D. A.1, AuthorMillard, E.1, AuthorMinard, M. -N.1, AuthorMinzoni, L.1, AuthorMitzel, D. S.1, AuthorMogini, A.1, AuthorMoise, R. D.1, AuthorMombaecher, T.1, AuthorMonroy, I. A.1, AuthorMonteil, S.1, AuthorMorandin, M.1, AuthorMorello, G.1, AuthorMorello, M. J.1, AuthorMorgunova, O.1, AuthorMoron, J.1, AuthorMorris, A. B.1, AuthorMountain, R.1, AuthorMuheim, F.1, AuthorMukherjee, M.1, AuthorMulder, M.1, AuthorMurphy, C. H.1, AuthorMurray, D.1, AuthorMoedden, A.1, AuthorMueller, D.1, AuthorMueller, J.1, AuthorMueller, K.1, AuthorMueller, V.1, AuthorNaik, P.1, AuthorNakada, T.1, AuthorNandakumar, R.1, AuthorNandi, A.1, AuthorNanut, T.1, AuthorNasteva, I.1, AuthorNeedham, M.1, AuthorNeri, N.1, AuthorNeubert, S.1, AuthorNeufeld, N.1, AuthorNewcombe, R.1, AuthorNguyen, T. D.1, AuthorNguyen-Mau, C.1, AuthorNieswand, S.1, AuthorNiet, R.1, AuthorNikitin, N.1, AuthorNogay, A.1, AuthorNolte, N. S.1, AuthorO'Hanlon, D. P.1, AuthorOblakowska-Mucha, A.1, AuthorObraztsov, V.1, AuthorOldeman, R.1, AuthorOnderwater, C. J. G.1, AuthorOssowska, A.1, AuthorOtalora Goicochea, J. M.1, AuthorOvsiannikova, T.1, AuthorOwen, P.1, AuthorOyanguren, A.1, AuthorPais, P. R.1, AuthorPajero, T.1, AuthorPalano, A.1, AuthorPalutan, M.1, AuthorPanshin, G.1, AuthorPapanestis, A.1, AuthorPappagallo, M.1, AuthorPappalardo, L. L.1, AuthorParker, W.1, AuthorParkes, C.1, AuthorPassaleva, G.1, AuthorPastore, A.1, AuthorPatel, M.1, AuthorPatrignani, C.1, AuthorPearce, A.1, AuthorPellegrino, A.1, AuthorPenso, G.1, AuthorAltarelli, M. Pepe1, AuthorPerazzini, S.1, AuthorPereima, D.1, AuthorPerret, P.1, AuthorPescatore, L.1, AuthorPetridis, K.1, AuthorPetrolini, A.1, AuthorPetrov, A.1, AuthorPetrucci, S.1, AuthorPetruzzo, M.1, AuthorPietrzyk, B.1, AuthorPietrzyk, G.1, AuthorPikies, M.1, AuthorPili, M.1, AuthorPinci, D.1, AuthorPinzino, J.1, AuthorPisani, F.1, AuthorPiucci, A.1, AuthorPlacinta, V.1, AuthorPlayfer, S.1, AuthorPlews, J.1, AuthorPlo Casasus, M.1, AuthorPolci, F.1, AuthorLener, M. Poli1, AuthorPoluektov, A.1, AuthorPolukhina, N.1, AuthorPolyakov, I.1, AuthorPolycarpo, E.1, AuthorPomery, G. J.1, AuthorPonce, S.1, AuthorPopov, A.1, AuthorPopov, D.1, AuthorPoslavskii, S.1, AuthorPrice, E.1, AuthorPrisciandaro, J.1, AuthorProuve, C.1, AuthorPugatch, V.1, AuthorNavarro, A. Puig1, AuthorPullen, H.1, AuthorPunzi, G.1, AuthorQian, W.1, AuthorQin, J.1, AuthorQuagliani, R.1, AuthorQuintana, B.1, AuthorRaab, N. V.1, AuthorRachwal, B.1, AuthorRademacker, J. H.1, AuthorRama, M.1, AuthorRamos Pernas, M.1, AuthorRangel, M. S.1, AuthorRatnikov, F.1, AuthorRaven, G.1, AuthorSalzgeber, M. Ravonel1, AuthorReboud, M.1, AuthorRedi, F.1, AuthorReichert, S.1, Authordos Reis, A. C.1, AuthorReiss, F.1, AuthorRemon Alepuz, C.1, AuthorRen, Z.1, AuthorRenaudin, V.1, AuthorRicciardi, S.1, AuthorRichards, S.1, AuthorRinnert, K.1, AuthorRobbe, P.1, AuthorRobert, A.1, AuthorRodrigues, A. B.1, AuthorRodrigues, E.1, AuthorRodriguez Lopez, J. A.1, AuthorRoehrken, M.1, AuthorRoiser, S.1, AuthorRollings, A.1, AuthorRomanovskiy, V.1, AuthorRomero Vidal, A.1, AuthorRotondo, M.1, AuthorRudolph, M. S.1, AuthorRuf, T.1, AuthorRuiz Vidal, J.1, AuthorSaborido Silva, J. J.1, AuthorSagidova, N.1, AuthorSaitta, B.1, AuthorSalustino Guimaraes, V.1, AuthorGras, C. Sanchez1, AuthorSanchez Mayordomo, C.1, AuthorSanmartin Sedes, B.1, AuthorSantacesaria, R.1, AuthorSantamarina Rios, C.1, AuthorSantimaria, M.1, AuthorSantovetti, E.1, AuthorSarpis, G.1, AuthorSarti, A.1, AuthorSatriano, C.1, AuthorSatta, A.1, AuthorSaur, M.1, AuthorSavrina, D.1, AuthorSchael, S.1, AuthorSchellenberg, M.1, AuthorSchiller, M.1, AuthorSchindler, H.1, AuthorSchmelling, M.2, Author           Schmelzer, T.1, AuthorSchmidt, B.1, AuthorSchneider, O.1, AuthorSchopper, A.1, AuthorSchreiner, H. F.1, AuthorSchubiger, M.1, AuthorSchulte, S.1, AuthorSchune, M. H.1, AuthorSchwemmer, R.1, AuthorSciascia, B.1, AuthorSciubba, A.1, AuthorSemennikov, A.1, AuthorSepulveda, E. S.1, AuthorSergi, A.1, AuthorSerra, N.1, AuthorSerrano, J.1, AuthorSestini, L.1, AuthorSeuthe, A.1, AuthorSeyfert, P.1, AuthorShapkin, M.1, AuthorShcheglov, Y.1, AuthorShears, T.1, AuthorShekhtman, L.1, AuthorShevchenko, V.1, AuthorShmanin, E.1, AuthorSiddi, B. G.1, AuthorCoutinho, R. Silva1, Authorde Silva Oliveira, L.1, AuthorSimi, G.1, AuthorSimone, S.1, AuthorSkiba, I.1, AuthorSkidmore, N.1, AuthorSkwarnicki, T.1, AuthorSlater, M. W.1, AuthorSmeaton, J. G.1, AuthorSmith, E.1, AuthorSmith, I. T.1, AuthorSmith, M.1, AuthorSoares, M.1, AuthorSoares Lavra, L.1, AuthorSokoloff, M. D.1, AuthorSoler, F. J. P.1, AuthorDe Souza Paula, B.1, AuthorSpaan, B.1, AuthorNorella, E. Spadaro1, AuthorSpradlin, P.1, AuthorStagni, F.1, AuthorStahl, M.1, AuthorStahl, S.1, AuthorStefko, P.1, AuthorStefkova, S.1, AuthorSteinkamp, O.1, AuthorStemmle, S.1, AuthorStenyakin, O.1, AuthorStepanova, M.1, AuthorStevens, H.1, AuthorStocchi, A.1, AuthorStone, S.1, AuthorStoraci, B.1, AuthorStracka, S.1, AuthorStramaglia, M. E.1, AuthorStraticiuc, M.1, AuthorStraumann, U.1, AuthorStrokov, S.1, AuthorSun, J.1, AuthorSun, L.1, AuthorSun, Y.1, AuthorSwientek, K.1, AuthorSzabelski, A.1, AuthorSzumlak, T.1, AuthorSzymanski, M.1, AuthorT'Jampens, S.1, AuthorTang, Z.1, AuthorTayduganov, A.1, AuthorTekampe, T.1, AuthorTellarini, G.1, AuthorTeubert, F.1, AuthorThomas, E.1, Authorvan Tilburg, J.1, AuthorTilley, M. J.1, AuthorTisserand, V.1, AuthorTobin, M.1, AuthorTolk, S.1, AuthorTomassetti, L.1, AuthorTonelli, D.1, AuthorTou, D. Y.1, AuthorTourinho Jadallah Aoude, R.1, AuthorTournefier, E.1, AuthorTraill, M.1, AuthorTran, M. T.1, AuthorTrisovic, A.1, AuthorTsaregorodtsev, A.1, AuthorTuci, G.1, AuthorTully, A.1, AuthorTuning, N.1, AuthorUkleja, A.1, AuthorUsachov, A.1, AuthorUstyuzhanin, A.1, AuthorUwer, U.1, AuthorVagner, A.1, AuthorVagnoni, V.1, AuthorValassi, A.1, AuthorValat, S.1, AuthorValenti, G.1, AuthorGomez, R. Vazquez1, AuthorVazquez Regueiro, P.1, AuthorVecchi, S.1, Authorvan Veghel, M.1, AuthorVelthuis, J. J.1, AuthorVeltri, M.1, AuthorVeneziano, G.1, AuthorVenkateswaran, A.1, AuthorVernet, M.1, AuthorVeronesi, M.1, AuthorVesterinen, M.1, AuthorBarbosa, J. V. Viana1, AuthorVieira, D.1, AuthorVieites Diaz, M.1, AuthorViemann, H.1, AuthorVilasis-Cardona, X.1, AuthorVitkovskiy, A.1, AuthorVitti, M.1, AuthorVolkov, V.1, AuthorVollhardt, A.1, AuthorBruch, D. Vom1, AuthorVoneki, B.1, AuthorVorobyev, A.1, AuthorVorobyev, V.1, AuthorVoropaev, N.1, Authorde Vries, J. A.1, AuthorSierra, C. Vazquez1, AuthorWaldi, R.1, AuthorWalsh, J.1, AuthorWang, J.1, AuthorWang, M.1, AuthorWang, Y.1, AuthorWang, Z.1, AuthorWard, D. R.1, AuthorWark, H. M.1, AuthorWatson, N. K.1, AuthorWebsdale, D.1, AuthorWeiden, A.1, AuthorWeisser, C.1, AuthorWhitehead, M.1, AuthorWilkinson, G.1, AuthorWilkinson, M.1, AuthorWilliams, I.1, AuthorWilliams, M. R. J.1, AuthorWilliams, M.1, AuthorWilliams, T.1, AuthorWilson, F. F.1, AuthorWinn, M.1, AuthorWislicki, W.1, AuthorWitek, M.1, AuthorWormser, G.1, AuthorWotton, S. A.1, AuthorWyllie, K.1, AuthorXiao, D.1, AuthorXie, Y.1, AuthorXu, A.1, AuthorXu, M.1, AuthorXu, Q.1, AuthorXu, Z.1, AuthorXu, Z.1, AuthorYang, Z.1, AuthorYang, Z.1, AuthorYao, Y.1, AuthorYeomans, L. E.1, AuthorYin, H.1, AuthorYu, J.1, AuthorYuan, X.1, AuthorYushchenko, O.1, AuthorZarebski, K. A.1, AuthorZavertyaev, M.1, AuthorZhang, D.1, AuthorZhang, L.1, AuthorZhang, W. C.1, AuthorZhang, Y.1, AuthorZhelezov, A.1, AuthorZheng, Y.1, AuthorZhu, X.1, AuthorZhukov, V.1, AuthorZonneveld, J. 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Affiliations:
1external, ou_persistent22              
2Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society, ou_2074298              

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 MPINP: LHCb - Abteilung Hinton
 Abstract: Using proton-proton collision data at centre-of-mass energies of root s = 7, 8 and 13 TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb(-1), the invariant mass spectrum of J/psi pairs is studied. A narrow structure around 6.9 GeV/c(2) matching the line-shape of a resonance and a broad structure just above twice the J/psi mass are observed. The deviation of the data from nonresonant J/psi-pair production is above five standard deviations in the mass region between 6.2 and 7.4 GeV/c(2), covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X(6900) structure are measured assuming a Breit-Wigner lineshape. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press.

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 Dates: 2020-11
 Publication Status: Issued
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 Identifiers: DOI: 10.1016/j.scib.2020.08.032
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Title: Science Bulletin
  Abbreviation : Sci. Bull.
Source Genre: Journal
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Publ. Info: Elsevier B.V.
Pages: - Volume / Issue: 65 (23) Sequence Number: - Start / End Page: 1983 - 1993 Identifier: ISSN: 2095-9273
CoNE: https://pure.mpg.de/cone/journals/resource/2095-9273