/ hep-ex FERMILAB-PUB-16-038-E


Observation of a new $B_s^0 \pi^\pm$ state


Abazov, V.M. (Dubna, JINR) ; Abbott, B. (Oklahoma U.) ; Acharya, B.S. (Tata Inst.) ; Adams, M. (Illinois U., Chicago) ; Adams, T. (Florida State U.) ; Agnew, J.P. (Manchester U., Comp. Sci. Dept.) ; Alexeev, G.D. (Dubna, JINR) ; Alkhazov, G. (St. Petersburg, INP) ; Alton, A. (Michigan U.) ; Askew, A. (Florida State U.) ; Atkins, S. (Louisiana Tech. U.) ; Augsten, K. (Prague, Tech. U.) ; Aushev, V. (Taras Shevchenko U.) ; Aushev, Y. (Taras Shevchenko U.) ; Avila, C. (Los Andes U.) ; Badaud, F. (Clermont-Ferrand U.) ; Bagby, L. (Fermilab) ; Baldin, B. (Fermilab) ; Bandurin, D.V. (Virginia U.) ; Banerjee, S. (Tata Inst.) ; Barberis, E. (Northeastern U.) ; Baringer, P. (Kansas U.) ; Bartlett, J.F. (Fermilab) ; Bassler, U. (DAPNIA, Saclay) ; Bazterra, V. (Illinois U., Chicago) ; Bean, A. (Kansas U.) ; Begalli, M. (Rio de Janeiro State U.) ; Bellantoni, L. (Fermilab) ; Beri, S.B. (Panjab U.) ; Bernardi, G. (Paris U., VI-VII) ; Bernhard, R. (Freiburg U.) ; Bertram, I. (Lancaster U.) ; Besancon, M. (DAPNIA, Saclay) ; Beuselinck, R. (Imperial Coll., London) ; Bhat, P.C. (Fermilab) ; Bhatia, S. (Mississippi U.) ; Bhatnagar, V. (Panjab U.) ; Blazey, G. (Northern Illinois U.) ; Blessing, S. (Florida State U.) ; Bloom, K. (Nebraska U.) ; Boehnlein, A. (Fermilab) ; Boline, D. (SUNY, Stony Brook) ; Boos, E.E. (Moscow State U.) ; Borissov, G. (Lancaster U.) ; Borysova, M. (Taras Shevchenko U.) ; Brandt, A. (Texas U., Arlington) ; Brandt, O. (Gottingen U., Zweites Phys. Inst.) ; Brochmann, M. (Washington U., Seattle) ; Brock, R. (Michigan State U.) ; Bross, A. (Fermilab) ; Brown, D. (Paris U., VI-VII) ; Bu, X.B. (Fermilab) ; Buehler, M. (Fermilab) ; Buescher, V. (Mainz U., Inst. Phys.) ; Bunichev, V. (Moscow State U.) ; Burdin, S. (Lancaster U.) ; Buszello, C.P. (Uppsala U.) ; Camacho-Perez, E. (CINVESTAV, IPN) ; Casey, B.C.K. (Fermilab) ; Castilla-Valdez, H. (CINVESTAV, IPN) ; Caughron, S. (Michigan State U.) ; Chakrabarti, S. (SUNY, Stony Brook) ; Chan, K.M. (Notre Dame U.) ; Chandra, A. (Rice U.) ; Chapon, E. (DAPNIA, Saclay) ; Chen, G. (Kansas U.) ; Cho, S.W. (Korea U.) ; Choi, S. (Korea U.) ; Choudhary, B. (Ramjas Coll.) ; Cihangir, S. (Fermilab) ; Claes, D. (Nebraska U.) ; Clutter, J. (Kansas U.) ; Cooke, M. (Fermilab) ; Cooper, W.E. (Fermilab) ; Corcoran, M. (Rice U.) ; Couderc, F. (DAPNIA, Saclay) ; Cousinou, M.C. (Marseille, CPPM) ; Cuth, J. (Mainz U., Inst. Phys.) ; Cutts, D. (Brown U.) ; Das, A. (Southern Methodist U.) ; Davies, G. (Imperial Coll., London) ; de Jong, S., J. (Nijmegen U.) ; De La Cruz-Burelo, E. (CINVESTAV, IPN) ; Deliot, F. (DAPNIA, Saclay) ; Demina, R. (Rochester U.) ; Denisov, D. (Fermilab) ; Denisov, S.P. (Serpukhov, IHEP) ; Desai, S. (Fermilab) ; Deterre, C. (Manchester U., Comp. Sci. Dept.) ; DeVaughan, K. (Nebraska U.) ; Diehl, H.T. (Fermilab) ; Diesburg, M. (Fermilab) ; Ding, P.F. (Manchester U., Comp. Sci. Dept.) ; Dominguez, A. (Nebraska U.) ; Drutskoy, A. (Moscow, ITEP) ; Dubey, A. (Ramjas Coll.) ; Dudko, L.V. (Moscow State U.) ; Duperrin, A. (Marseille, CPPM) ; Dutt, S. (Panjab U.) ; Eads, M. (Northern Illinois U.) ; Edmunds, D. (Michigan State U.) ; Ellison, J. (UC, Riverside) ; Elvira, V.D. (Fermilab) ; Enari, Y. (Paris U., VI-VII) ; Evans, H. (Indiana U.) ; Evdokimov, A. (Illinois U., Chicago) ; Evdokimov, V.N. (Serpukhov, IHEP) ; Faure, A. (DAPNIA, Saclay) ; Feng, L. (Northern Illinois U.) ; Ferbel, T. (Rochester U.) ; Fiedler, F. (Mainz U., Inst. Phys.) ; Filthaut, F. (Nijmegen U.) ; Fisher, W. (Michigan State U.) ; Fisk, H.E. (Fermilab) ; Fortner, M. (Northern Illinois U.) ; Fox, H. (Lancaster U.) ; Franc, J. (Prague, Tech. U.) ; Fuess, S. (Fermilab) ; Garbincius, P.H. (Fermilab) ; Garcia-Bellido, A. (Rochester U.) ; Garcia-Gonzalez, J.A. (CINVESTAV, IPN) ; Gavrilov, V. (Moscow, ITEP) ; Geng, W. (Michigan State U.) ; Gerber, C.E. (Illinois U., Chicago) ; Gershtein, Y. (Rutgers U., Piscataway) ; Ginther, G. (Fermilab) ; Gogota, O. (Taras Shevchenko U.) ; Golovanov, G. (Dubna, JINR) ; Grannis, P.D. (SUNY, Stony Brook) ; Greder, S. (Louis Pasteur U., Strasbourg I) ; Greenlee, H. (Fermilab) ; Grenier, G. (Lyon U.) ; Gris, Ph. (Clermont-Ferrand U.) ; Grivaz, J.F. (Orsay) ; Grohsjean, A. (DAPNIA, Saclay) ; Grunendahl, S. (Fermilab) ; Grunewald, M.W. (University Coll., Dublin) ; Guillemin, T. (Orsay) ; Gutierrez, G. (Fermilab) ; Gutierrez, P. (Oklahoma U.) ; Haley, J. (Oklahoma State U.) ; Han, L. (Hefei, CUST) ; Harder, K. (Manchester U., Comp. Sci. Dept.) ; Harel, A. (Rochester U.) ; Hauptman, J.M. (Iowa State U.) ; Hays, J. (Imperial Coll., London) ; Head, T. (Manchester U., Comp. Sci. Dept.) ; Hebbeker, T. (Aachen, Tech. Hochsch.) ; Hedin, D. (Northern Illinois U.) ; Hegab, H. (Oklahoma State U.) ; Heinson, A.P. (UC, Riverside) ; Heintz, U. (Brown U.) ; Hensel, C. (Rio de Janeiro, CBPF) ; La Cruz, I.Heredia-De (CINVESTAV, IPN) ; Herner, K. (Fermilab) ; Hesketh, G. (Manchester U., Comp. Sci. Dept.) ; Hildreth, M.D. (Notre Dame U.) ; Hirosky, R. (Virginia U.) ; Hoang, T. (Florida State U.) ; Hobbs, J.D. (SUNY, Stony Brook) ; Hoeneisen, B. (San Francisco de Quito U.) ; Hogan, J. (Rice U.) ; Hohlfeld, M. (Mainz U., Inst. Phys.) ; Holzbauer, J.L. (Mississippi U.) ; Howley, I. (Texas U., Arlington) ; Hubacek, Z. (DAPNIA, Saclay) ; Hynek, V. (Prague, Tech. U.) ; Iashvili, I. (SUNY, Buffalo) ; Ilchenko, Y. (Southern Methodist U.) ; Illingworth, R. (Fermilab) ; Ito, A.S. (Fermilab) ; Jabeen, S. (Fermilab) ; Jaffre, M. (Orsay) ; Jayasinghe, A. (Oklahoma U.) ; Jeong, M.S. (Korea U.) ; Jesik, R. (Imperial Coll., London) ; Jiang, P. (Hefei, CUST) ; Johns, K. (Arizona U.) ; Johnson, E. (Michigan State U.) ; Johnson, M. (Fermilab) ; Jonckheere, A. (Fermilab) ; Jonsson, P. (Imperial Coll., London) ; Joshi, J. (UC, Riverside) ; Jung, A.W. (Fermilab) ; Juste, A. (Barcelona, IFAE) ; Kajfasz, E. (Marseille, CPPM) ; Karmanov, D. (Moscow State U.) ; Katsanos, I. (Nebraska U.) ; Kaur, M. (Panjab U.) ; Kehoe, R. (Southern Methodist U.) ; Kermiche, S. (Marseille, CPPM) ; Khalatyan, N. (Fermilab) ; Khanov, A. (Oklahoma State U.) ; Kharchilava, A. (SUNY, Buffalo) ; Kharzheev, Y.N. (Dubna, JINR) ; Kiselevich, I. (Moscow, ITEP) ; Kohli, J.M. (Panjab U.) ; Kozelov, A.V. (Serpukhov, IHEP) ; Kraus, J. (Mississippi U.) ; Kumar, A. (SUNY, Buffalo) ; Kupco, A. (Prague, Inst. Plasma Phys.) ; Kurca, T. (Lyon U.) ; Kuzmin, V.A. (Moscow State U.) ; Lammers, S. (Indiana U.) ; Lebrun, P. (Lyon U.) ; Lee, H.S. (Korea U.) ; Lee, S.W. (Iowa State U.) ; Lee, W.M. (Fermilab) ; Lei, X. (Arizona U.) ; Lellouch, J. (Paris U., VI-VII) ; Li, D. (Paris U., VI-VII) ; Li, H. (Virginia U.) ; Li, L. (UC, Riverside) ; Li, Q.Z. (Fermilab) ; Lim, J.K. (Korea U.) ; Lincoln, D. (Fermilab) ; Linnemann, J. (Michigan State U.) ; Lipaev, V.V. (Serpukhov, IHEP) ; Lipton, R. (Fermilab) ; Liu, H. (Southern Methodist U.) ; Liu, Y. (Hefei, CUST) ; Lobodenko, A. (St. Petersburg, INP) ; Lokajicek, M. (Prague, Inst. Plasma Phys.) ; Lopes de Sa, R. (Fermilab) ; Luna-Garcia, R. (CINVESTAV, IPN) ; Lyon, A.L. (Fermilab) ; Maciel, A.K.A. (Rio de Janeiro, CBPF) ; Madar, R. (Freiburg U.) ; Magana-Villalba, R. (CINVESTAV, IPN) ; Malik, S. (Nebraska U.) ; Malyshev, V.L. (Dubna, JINR) ; Mansour, J. (Gottingen U., Zweites Phys. Inst.) ; Martinez-Ortega, J. (CINVESTAV, IPN) ; McCarthy, R. (SUNY, Stony Brook) ; McGivern, C.L. (Manchester U., Comp. Sci. Dept.) ; Meijer, M.M. (Nijmegen U.) ; Melnitchouk, A. (Fermilab) ; Menezes, D. (Northern Illinois U.) ; Mercadante, P.G. (ABC Federal U.) ; Merkin, M. (Moscow State U.) ; Meyer, A. (Aachen, Tech. Hochsch.) ; Meyer, J. (Gottingen U., Zweites Phys. Inst.) ; Miconi, F. (Louis Pasteur U., Strasbourg I) ; Mondal, N.K. (Tata Inst.) ; Mulhearn, M. (Virginia U.) ; Nagy, E. (Marseille, CPPM) ; Narain, M. (Brown U.) ; Nayyar, R. (Arizona U.) ; Neal, H.A. (Michigan U.) ; Negret, J.P. (Los Andes U.) ; Neustroev, P. (St. Petersburg, INP) ; Nguyen, H.T. (Virginia U.) ; Nunnemann, T. (Munich U.) ; Orduna, J. (Brown U.) ; Osman, N. (Marseille, CPPM) ; Pal, A. (Texas U., Arlington) ; Parashar, N. (Purdue U.) ; Parihar, V. (Brown U.) ; Park, S.K. (Korea U.) ; Partridge, R. (Brown U.) ; Parua, N. (Indiana U.) ; Patwa, A. (Brookhaven) ; Penning, B. (Imperial Coll., London) ; Perfilov, M. (Moscow State U.) ; Peters, Y. (Manchester U., Comp. Sci. Dept.) ; Petridis, K. (Manchester U., Comp. Sci. Dept.) ; Petrillo, G. (Rochester U.) ; Petroff, P. (Orsay) ; Pleier, M.A. (Brookhaven) ; Podstavkov, V.M. (Fermilab) ; Popov, A.V. (Serpukhov, IHEP) ; Prewitt, M. (Rice U.) ; Price, D. (Manchester U., Comp. Sci. Dept.) ; Prokopenko, N. (Serpukhov, IHEP) ; Qian, J. (Michigan U.) ; Quadt, A. (Gottingen U., Zweites Phys. Inst.) ; Quinn, B. (Mississippi U.) ; Ratoff, P.N. (Lancaster U.) ; Razumov, I. (Serpukhov, IHEP) ; Ripp-Baudot, I. (Louis Pasteur U., Strasbourg I) ; Rizatdinova, F. (Oklahoma State U.) ; Rominsky, M. (Fermilab) ; Ross, A. (Lancaster U.) ; Royon, C. (Prague, Inst. Plasma Phys.) ; Rubinov, P. (Fermilab) ; Ruchti, R. (Notre Dame U.) ; Sajot, G. (LPSC, Grenoble) ; Sanchez-Hernandez, A. (CINVESTAV, IPN) ; Sanders, M.P. (Munich U.) ; Santos, A.S. (Rio de Janeiro, CBPF) ; Savage, G. (Fermilab) ; Savitskyi, M. (Taras Shevchenko U.) ; Sawyer, L. (Louisiana Tech. U.) ; Scanlon, T. (Imperial Coll., London) ; Schamberger, R.D. (SUNY, Stony Brook) ; Scheglov, Y. (St. Petersburg, INP) ; Schellman, H. (Northwestern U.) ; Schott, M. (Mainz U., Inst. Phys.) ; Schwanenberger, C. (Manchester U., Comp. Sci. Dept.) ; Schwienhorst, R. (Michigan State U.) ; Sekaric, J. (Kansas U.) ; Severini, H. (Oklahoma U.) ; Shabalina, E. (Gottingen U., Zweites Phys. Inst.) ; Shary, V. (DAPNIA, Saclay) ; Shaw, S. (Manchester U., Comp. Sci. Dept.) ; Shchukin, A.A. (Serpukhov, IHEP) ; Simak, V. (Prague, Tech. U.) ; Skubic, P. (Oklahoma U.) ; Slattery, P. (Rochester U.) ; Snow, G.R. (Nebraska U.) ; Snow, J. (Langston U.) ; Snyder, S. (Brookhaven) ; Soldner-Rembold, S. (Manchester U., Comp. Sci. Dept.) ; Sonnenschein, L. (Aachen, Tech. Hochsch.) ; Soustruznik, K. (Charles U., Prague) ; Stark, J. (LPSC, Grenoble) ; Stefaniuk, N. (Taras Shevchenko U.) ; Stoyanova, D.A. (Serpukhov, IHEP) ; Strauss, M. (Oklahoma U.) ; Suter, L. (Manchester U., Comp. Sci. Dept.) ; Svoisky, P. (Virginia U.) ; Titov, M. (DAPNIA, Saclay) ; Tokmenin, V.V. (Dubna, JINR) ; Tsai, Y.T. (Rochester U.) ; Tsybychev, D. (SUNY, Stony Brook) ; Tuchming, B. (DAPNIA, Saclay) ; Tully, C. (Princeton U.) ; Uvarov, L. (St. Petersburg, INP) ; Uvarov, S. (St. Petersburg, INP) ; Uzunyan, S. (Northern Illinois U.) ; Van Kooten, R. (Indiana U.) ; W. van Leeuwen, M. (NIKHEF, Amsterdam) ; Varelas, N. (Illinois U., Chicago) ; Varnes, E.W. (Arizona U.) ; Vasilyev, I.A. (Serpukhov, IHEP) ; Verkheev, A.Y. (Dubna, JINR) ; Vertogradov, L.S. (Dubna, JINR) ; Verzocchi, M. (Fermilab) ; Vesterinen, M. (Manchester U., Comp. Sci. Dept.) ; Vilanova, D. (DAPNIA, Saclay) ; Vokac, P. (Prague, Tech. U.) ; Wahl, H.D. (Florida State U.) ; Wang, M.H.L.S. (Fermilab) ; Warchol, J. (Notre Dame U.) ; Watts, G. (Washington U., Seattle) ; Wayne, M. (Notre Dame U.) ; Weichert, J. (Mainz U., Inst. Phys.) ; Welty-Rieger, L. (Northwestern U.) ; Williams, M.R.J. (Indiana U.) ; Wilson, G.W. (Kansas U.) ; Wobisch, M. (Louisiana Tech. U.) ; Wood, D.R. (Northeastern U.) ; Wyatt, T.R. (Manchester U., Comp. Sci. Dept.) ; Xie, Y. (Fermilab) ; Yamada, R. (Fermilab) ; Yang, S. (Hefei, CUST) ; Yasuda, T. (Fermilab) ; Yatsunenko, Y.A. (Dubna, JINR) ; Ye, W. (SUNY, Stony Brook) ; Ye, Z. (Fermilab) ; Yin, H. (Fermilab) ; Yip, K. (Brookhaven) ; Youn, S.W. (Fermilab) ; Yu, J.M. (Michigan U.) ; Zennamo, J. (SUNY, Buffalo) ; Zhao, T.G. (Manchester U., Comp. Sci. Dept.) ; Zhou, B. (Michigan U.) ; Zhu, J. (Michigan U.) ; Zielinski, M. (Rochester U.) ; Zieminska, D. (Indiana U.) ; Zivkovic, L. (Paris U., VI-VII)

Published in: Phys.Rev.Lett.
Pages: 8

Abstract: We report the observation of a narrow structure, $X(5568)$, in the decay sequence $X(5568) \rightarrow B_s^0 \pi^{\pm}$, $B_s^0 \rightarrow J/\psi \phi$, $J/\psi\rightarrow \mu^+ \mu^-$, $\phi \rightarrow K^+K^-$. This is the first observation of a hadronic state with valence quarks of four different flavors. The mass and natural width of the new state are measured to be $m = 5567.8 \pm 2.9 {\rm \thinspace (stat)} ^{+0.9}_{-1.9} {\rm \thinspace (syst)}$ MeV/$c^2$ and $\Gamma = 21.9 \pm 6.4 {\rm \thinspace (stat)} ^{+5.0}_{-2.5} {\rm \thinspace (syst)} $ MeV/$c^2$, and the significance including look-elsewhere effect and systematic uncertainties is 5.1$\sigma$. The observation is based on$10.4~\rm{fb^{-1}}$ of $p \overline p $ collision data at $\sqrt{s}$ = 1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider.

Web-Page: http://inspirehep.net/record/1423301/files/fig_Bs_mass.png; http://inspirehep.net/record/1423301/files/Fig_bgrds_2.png; http://inspirehep.net/record/1423301/files/fig_Bspi_noconecut.png; http://inspirehep.net/record/1423301/files/fig_Bspi_conecut.png; http://inspirehep.net/record/1423301/files/fig_Bspi_BsFit_cone_new.png; http://inspirehep.net/record/1423301/files/arXiv:1602.07588.pdf; http://www.symmetrymagazine.org/article/fermilab-scientists-discover-new-four-flavor-particle; http://news.fnal.gov/2016/02/dzero-discovers-a-new-particle-consistent-with-a-tetraquark/


Note: 8 pages, 4 figures, submitted to Phys. Rev. Lett

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