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Observation of a Narrow Meson State Decaying to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>D</mml:mi><mml:mi>s</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>at a Mass of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2.32</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">G</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi><mml:mo>/</mml:mo><mml:msup><mml:mi>c</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>
B. Aubert, R. Barate, D. Boutigny, J.-M. Gaillard, A. Hicheur, Y. Karyotakis, J. P. Lees, P. Robbe, V. Tisserand, A. Zghiche, A. Palano, A. Pompili, J. C. Chen, N. D. Qi, G. Rong, P Wang, Y. S. Zhu, G. Eigen, I. Ofte, B. Stugu, G. S. Abrams, A. W. Borgland, A. B. Breon, D. N. Brown, J. Button‐Shafer, R. N. Cahn, E. Charles, C. T. Day, M. S. Gill, A. V. Gritsan, Y. Groysman, R. G. Jacobsen, R. W. Kadel, J. A. Kadyk, L. T. Kerth, Yu. G. Kolomensky, J.F. Kral, G. Kukartsev, C. LeClerc, M. E. Levi, G. Lynch, L. M. Mir, P. J. Oddone, T. J. Orimoto, M. Pripstein, N. A. Roe, A. Romosan, M. T. Ronan, V. Shelkov, A. V. Telnov, W.A. Wenzel, K. E. Ford, T. Harrison, C. M. Hawkes, D. J. Knowles, S. E. Morgan, R. C. Penny, A. T. Watson, N. K. Watson, T. Deppermann, K. Goetzen, H. Koch, B. Lewandowski, M. Pelizaeus, Κ. Peters, H. Schmuecker, M. Steinke, N. Barlow, J. Boyd, N. Chevalier, W. N. Cottingham, M. Kelly, T. Latham, C. K. Mackay, F. F. Wilson, K. Abe, T. Çuhadar-Dönszelmann, C. Hearty, T. S. Mattison, J. A. McKenna, D. Thiessen, P. Kyberd, A. K. McKemey, V. E. Blinov, A. D. Bukin, В. Б. Голубев, V. Ivanchenko, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, A. N. Yushkov, David Best, M. Chao, D. Kirkby, A. J. Lankford, M. Mandelkern, S. J. McMahon, R. K. Mommsen, W. Roethel, D. P. Stoker, C. Buchanan, D. Del Re, H. K. Hadavand, E. J. Hill, D. B. MacFarlane, H. P. Paar, S. Rahatlou, U. Schwanke, V. Sharma, J. Berryhill, C. Campagnari, B. Dahmes, N. Kuznetsova, S. L. Levy, O. Long, A. Lu, M. A. Mazur, J. D. Richman, W. Verkerke, T. W. Beck, J. Beringer, A. M. Eisner, C. A. Heusch, W. S. Lockman, T. Schalk, R. E. Schmitz, B. A. Schumm, A. Seiden, M. Turri, W. Walkowiak, D. C. Williams, M. G. Wilson, J. Albert, E. Chen, G. P. Dubois-Felsmann, A. Dvoretskii, D. G. Hitlin, I. Narsky, F. C. Porter, A. Rýd, A. Samuel, S. Yang, S. Jayatilleke, G. Mancinelli, B. Meadows, M. D. Sokoloff, K. Abe, T. Barillari, F. Blanc, P. C. Bloom, P. J. Clark, W. T. Ford, U. Nauenberg, A. Olivas, P. Rankin, J. Roy, J. G. Smith, W.C. van Hoek, L Zhang, J. L. Harton, J. F. Hu, A. Soffer, W. H. Toki, R. J. Wilson, J. Zhang, D. D. Altenburg, T. Brandt, J. Brose, T. Colberg, M. Dickopp, R. S. Dubitzky, H. M. Lacker, E. Maly, R. Müller-Pfefferkorn, R. Nogowski, S. Otto, K. R. Schubert, R. Schwierz, B. Spaan, L. Wilden, D. Bernard, G. R. Bonneaud, F. Brochard, J. Cohen-Tanugi, Ch. Thiebaux, G. Vasileiadis, M. Verderi, A. Khan, D. Lavin, S. Playfer, J. E. Swain, J. Tinslay, M. Andreotti, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Luppi, M. Negrini, L. Piemontese, A. Sarti, E. Treadwell, F. Anulli, R. Baldini-Ferroli, A. Calcaterra, R. de Sangro, D. Falciai, G. Finocchiaro, P. Patteri, I. M. Peruzzi, M. Piccolo, A. Zallo, A. Buzzo, R. Contri, M. Lo Vetere, M. Macrı́, M. R. Monge, S. Passaggio, F. Pastore, C. Patrignani, E. Robutti, A. Santroni, S. Tosi, S. Bailey, M. Morii, M. L. Aspinwall, W. Bhimji, D. A. Bowerman, P. D. Dauncey, U. Egede, I. Eschrich, G. W. Morton, J. Nash, P. Sanders, G. P. Taylor, G. J. Grenier, S.-J. Lee, U. Mallik, J. Cochran, H. B. Crawley, J. Lamsa, W. T. Meyer, S. Prell, E. I. Rosenberg, J. I. Yi, M. Davier, G. Grosdidier, A. Höcker, S. Laplace, F. Le Diberder, V. Lepeltier, A. M. Lutz, T. C. Petersen, S. Plaszczynski, M. H. Schune, L. Tantot, G. Wormser, V. Brigljević, C. H. Cheng, D. J. Lange, D. Wright, A. J. Bevan, J. P. Coleman, J. R. Fry, E. Gabathuler, R. Gamet, M. Kay, R. J. Parry, D. J. Payne, R. J. Sloane, C. Touramanis, J. J. Back, P. F. Harrison, H. W. Shorthouse, P. Strother, P.B. Vidal, C. L. Brown, G. Cowan, R. L. Flack, H. U. Flaecher, Simon George, M. G. Green, A. Kurup, C. E. Marker, T. R. McMahon, S. Ricciardi, F. Salvatore, G. Vaitsas, M. A. Winter, D. N. Brown, C. L. Davis, J. Allison, R. J. Barlow, A. Forti, P. A. Hart, F. Jackson, G. Lafferty, A. J. Lyon, J. H. Weatherall, J. C. Williams, A. Farbin, A. Jawahery, D. Kovalskyi, C. K. Lae, V. Lillard, D. A. Roberts, G. Blaylock, C. Dallapiccola, K. T. Flood, S. S. Hertzbach, R. Kofler, V. B. Koptchev, T. B. Moore, S. Saremi, H. Staengle, S. Willocq, R. Cowan, G. Sciolla, F. Ë. Taylor, R. K. Yamamoto, D. Mangeol, M. Milek, P. M. Patel, A. Lazzaro, F. Palombo, J. M. Bauer, L. Cremaldi, V. Eschenburg, R. Godang, R. Kroeger, J. Reidy, D. A. Sanders, D. J. Summers, H. W. Zhao, C. Hast, P. Taras, H. Nicholson, C. Cartaro, N. Cavallo, G. De Nardo, F. Fabozzi, C. Gatto, L. Lista, P. Paolucci, D. Piccolo, C. Sciacca, M. Baak, G. Raven, J. M. LoSecco, T.A. Gabriel, B. Brau, T. Pulliam, J. E. Brau, R. Frey, C. T. Potter, N. B. Sinev, D. Strom, E. Torrence, F. Colecchia, A. Dorigo, F. Galeazzi, M. Margoni, M. Morandin, M. Posocco, M. Rotondo, F. Simonetto, R. Stroili, G. Tiozzo, C. Voci, M. Benayoun, H. Briand, J. Chauveau, P. David, Ch. de la Vaissière, L. Del Buono, O. Hamon, M. John, Ph. Leruste, J. Ocariz, M. Pivk, L. Roos, J. Stark, S. T’Jampens, P.F. Manfredi, V. Re, L. Gladney, Q. H. Guo, J. Panetta, C. Angelini, G. Batignani, S. Bettarini, M. Bondioli, F. Bucci, G. Calderini, M. Carpinelli, F. Forti, M. A. Giorgi, A. Lusiani, G. Marchiori, F. Martínez-Vidal, M. Morganti, N. Néri, E. Paoloni, M. Rama, G. Rizzo, F. Sandrelli, J. Walsh, M. Haire, D. Judd, K. Paick, D. E. Wagoner, N. Danielson, P. Elmer, Cai-Dian Lü, V. Miftakov, J. Olsen, A. J. S. Smith, E. W. Varnes, F. Bellini, G. Cavoto, R. Faccini, F. Ferrarotto, F. Ferroni, M. Gaspero, M. A. Mazzoni, S. Morganti, M. Pierini, G. Piredda, F. Safai Tehrani, C. Voena, S. Christ, G. Wagner, R. Waldi, T. Adye, N. De Groot, B. Franek, N. I. Geddes, G. P. Gopal, E. O. Olaiya, S. Xella, R. Aleksan, S. Emery, A. Gaidot, S. F. Ganzhur, P-F Giraud, G. Hamel de Monchenault, W. Kozanecki, M. Langer, G. W. London, B. Mayer, G. Schott, G. Vasseur, Ch. Yéche, M. Zito, M. V. Purohit, A. W. Weidemann, F. X. Yumiceva, D. Aston, J. Bartelt, R. Bartoldus, N. Berger, A. M. Boyarski, O. L. Buchmueller, M. R. Convery, D. P. Coupal, D. Dong, J. Dorfan, D. Dujmić, W. Dunwoodie, R. C. Field, T. Glanzman, S. J. Gowdy, E. Graugés, T. Hadig, V. Halyo, T. Hryn’ova, W. R. Innes, C. P. Jessop, M. Kelsey, P Kim, M. L. Kocian, U. Langenegger, D. W. G. S. Leith, S. Luitz, V. Lüth, H. L. Lynch, H. Marsiske, S. Menke, R. Messner, D. R. Müller, C. P. O’Grady, V. E. Ozcan, A. Perazzo, M. Perl, S. Petrak, B. N. Ratcliff, S. H. Robertson, A. Roodman, A. A. Salnikov, R. H. Schindler, J. Schwiening, G. Simi, A. Snyder, A. Soha, J. Stelzer, D. Su, M. K. Sullivan, H.A. Tanaka, J. Va’vra, S. R. Wagner, M. Weaver, A. J. Weinstein, W. J. Wisniewski, D. H. Wright, C. C. Young, P. R. Burchat, A. J. Edwards, T. I. Meyer, C. Roat, S. Ahmed, M. S. Alam, J. Ernst, M. Saleem, F. Wappler, W. Bugg, M. Krishnamurthy, S. M. Spanier, R. Eckmann, Hyun Chan Kim, J. L. Ritchie, R. F. Schwitters, J. M. Izen, I. Kitayama, X. C. Lou, S. Ye, F. Bianchi, M. Bóna, F. Gallo, D. Gamba, C. Borean, L. Bosisio, G. Della Ricca, S. Dittongo, S. Grancagnolo, L. Lanceri, P. Poropat, L. Vitale, G. Vuagnin, R. S. Panvini, Sw. Banerjee, C. M. Brown, D. Fortin, P. Jackson, R. Kowalewski, J. M. Roney, H. R. Band, S. Dasu, M. Datta, A. M. Eichenbaum, H. Hu, J. R. Johnson, P. E. Kutter, H. Li, R. Liu, F. Di Lodovico, A. Mihályi, A. Mohapatra, Y. Pan, R. Prepost, S. J. Sekula, J. H. von Wimmersperg-Toeller, J. Wu, S. L. Wu, Z. Yu, H. Neal
Bibliographic record
VenuePhysical Review Letters · 2003
Typearticle
Languagelv
FieldPhysics and Astronomy
TopicParticle physics theoretical and experimental studies
Canadian institutionsUniversity of VictoriaUniversité de MontréalMcGill UniversityUniversity of British Columbia
FundersSLAC National Accelerator LaboratoryInstitut National de Physique Nucléaire et de Physique des ParticulesInstitute of High Energy PhysicsNatural Sciences and Engineering Research Council of CanadaCentre National de la Recherche ScientifiqueBundesministerium für Bildung und ForschungDeutsche ForschungsgemeinschaftU.S. Department of EnergyNational Science Foundation
KeywordsPhysicsLuminosityAnnihilationParticle physicsNuclear physicsMesonIsospinInvariant massState (computer science)AlgorithmQuantum mechanics
Abstract
We have observed a narrow state near $2.32\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ in the inclusive ${D}_{s}^{+}{\ensuremath{\pi}}^{0}$ invariant mass distribution from ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data at energies near 10.6 GeV. The observed width is consistent with the experimental resolution. The small intrinsic width and the quantum numbers of the final state indicate that the decay violates isospin conservation. The state has natural spin-parity and the low mass suggests a ${J}^{P}={0}^{+}$ assignment. The data sample corresponds to an integrated luminosity of $91\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ recorded by the BABAR detector at the SLAC PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ storage ring.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: Bench or experimental
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.023
Threshold uncertainty score0.077
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.023 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
Opus teacher head0.018
GPT teacher head0.251
Teacher spread0.233 · how far apart the two teachers sit on this one work
Validation status
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
The models applied no category: nothing in the taxonomy fit this work.
Study designBench or experimental
Domainnot available
GenreEmpirical
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".
Quick stats
Citations706
Published2003
Admission routes2
Has abstractyes