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Observation and Properties of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>Decaying to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">T</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi></mml:math>
V. M. Abazov, B. Abbott, M. Abolins, B. S. Acharya, D. L. Adams, M. Adams, T. Adams, M. Agelou, J.-L. Agram, S. N. Ahmed, S. H. Ahn, G. D. Alexeev, G. Alkhazov, G. Alverson, G. A. Alves, S. Anderson, B. Andrieu, Y. Arnoud, Andrew Askew, B. Åsman, C. Autermann, C. Ávila, L. Babukhadia, T. C. Bacon, A. Baden, S. Baffioni, B. Baldin, P. W. Balm, S. Banerjee, E. Barberis, P. Bargassa, P. Baringer, C. Barnes, J. Barreto, J. F. Bartlett, U. Bassler, D. Bauer, A. Bean, S. Beauceron, F. Beaudette, M. Begel, S. B. Beri, G. Bernardi, I. A. Bertram, M. Besançon, Anne Besson, R. Beuselinck, V. A. Bezzubov, P. C. Bhat, V. Bhatnagar, M. Bhattacharjee, M. Binder, A. Bischoff, K. M. Black, I. Blackler, G. Blazey, F. Blekman, D. Blöch, U. Blumenschein, A. Boehnlein, T. A. Bolton, P. Bonamy, F. Borcherding, G. Borissov, K. Bos, T. Bose, C. Boswell, A. Brandt, G. Briskin, R. Brock, G. Brooijmans, A. Bross, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, T. H. Burnett, K. Satô, J. M. Butler, J. Bystrický, F. Canelli, W. Carvalho, D. Casey, N. M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K. M. Chan, A. Chandra, D. Chapin, F. Charles, E. Cheu, L. Chevalier, D. K. Cho, S. Choi, S. Chopra, T. Christiansen, L. Christofek, D. R. Claes, A. R. Clark, C. Clément, Y. Coadou, D. J. Colling, L. Coney, B. Connolly, W. E. Cooper, D. Coppage, M. Corcoran, J. Coss, A. Cothenet, M.-C. Cousinou, S. Crépé-Renaudin, M. Cristetiu, M.A.C. Cummings, D. Cutts, H. da Motta, Brian Davies, G. Davies, G. A. Davis, K. De, S. J. de Jong, E. De La Cruz–Burelo, C. De Oliveira Martins, S. Dean, K. Del Signore, F. Déliot, P. A. Delsart, M. Demarteau, R. Demina, P. Demine, D. Denisov, S. P. Denisov, S. Desai, H. T. Diehl, M. Diesburg, Mark Doidge, H. Dong, S. Doulas, L. Duflot, S. R. Dugad, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, T. Edwards, J. Ellison, J. Elmsheuser, J. T. Eltzroth, V. D. Elvira, S. C. Eno, P. Ermolov, O. V. Eroshin, J. Estrada, D. Evans, H. Evans, A. Evdokimov, В. Н. Евдокимов, J. Fast, S. N. Fatakia, D. Fein, L. Feligioni, T. Ferbel, F. Fiedler, F. Filthaut, H. E. Fisk, F. Fleuret, M. Fortner, H. Fox, W. Freeman, S. Fu, S. Fuess, Cristina Galea, E. Gallas, E. Galyaev, M. Gao, C. Garcı́a, A. Garcia-Bellido, J. Gardner, V. Gavrilov, D. Gelé, R. Gelhaus, K. Genser, C. E. Gerber, Y. Gershtein, G. Geurkov, G. Ginther, K. Goldmann, T. Golling, B. Gómez, K. Gounder, A. G. Goussiou, Gerard J. Graham, P. D. Grannis, S. Greder, J. A. Green, H. Greenlee, Z. D. Greenwood, E. M. Gregores, S. Grinstein, J.-F. Grivaz, L. Groer, S. Grünendahl, M. Grünewald, W. X. Gu, S. N. Gurzhiev, G. Reales Gutiérrez, P. Gutierrez, A. Haas, N. J. Hadley, H. Haggerty, S. Hagopian, I. Hall, R. E. Hall, C. Han, L. Han, K. Hanagaki, P. Hanlet, K. Harder, J. M. Hauptman, Reiner Hauser, C. P. Hays, J. Hays, C. Hébert, D. Hedin, J. M. Heinmiller, A. P. Heinson, U. Heintz, C. Hensel, G. Hesketh, M. D. Hildreth, R. Hirosky, J. D. Hobbs, B. Hoeneisen, M. Hohlfeld, S. J. Hong, R. Hooper, S. Hou, Y. Hu, J. S. Huang, Y. Huang, I. Iashvili, R. Illingworth, A. S. Ito, S. Jabeen, M. Jaffré, Sa. Jain, V. Jain, K. Jakobs, A. Jenkins, R. Jesik, Y. Jiang, K. A. Johns, M. Johnson, Pamela Johnson, A. Jonckheere, P. Jonsson, H. Jöstlein, M. M. Kado, D. Käfer, W. Kahl, S. J. Kahn, E. Kajfasz, A. Kalinin, J. M. Kalk, D. Karmanov, J. Kasper, D. Kau, Zunjian Ke, R. Kehoe, S. Kermiche, S. Kesisoglou, A. Khanov, A. Kharchilava, Y. M. Kharzheev, K. H. Kim, B. Klima, M. Klute, J. M. Kohli, M. Kopál, V. M. Korablev, J. Kotcher, B. Kothari, A. Kotwal, A. Koubarovsky, A. Kouchner, O. Kouznetsov, A. V. Kozelov, J. Kozminski, J. Krane, M. R. Krishnaswamy, S. Krzywdziński, M. Kubantsev, S. Kuleshov, Y. Kulik, S. Kunori, A. Kupčo, Tibor Kurca, В. Е. Кузнецов, S. Lager, N. Lahrichi, G. Landsberg, J. Lazo-Flores, A.-C. Le Bihan, P. Lebrun, S. W. Lee, W. M. Lee, A. Leflat, C. Leggett, F. Lehner, C. Leonidopoulos, P. Lewis, J. Li, Q. Z. Li, X. Li, J. G. R. Lima, D. Lincoln, S. L. Linn, J. Linnemann, R. Lipton, L. Lobo, A. Lobodenko, M. Lokajı́ček, A. Lounis, J. D. Lu, H. J. Lubatti, A. Lucotte, L. Lueking, C. L. Luo, M. Lynker, A. L. Lyon, A. K. A. Maciel, R. J. Madaras, P. Mättig, A.-M. Magnan, M. Maity, P. Mal, S. Malik, V. L. Malyshev, V. Manankov, H. S. Mao, Y. Maravin, T. Marshall, M. Martens, M. I. Martin, S. E. K. Mattingly, A. A. Mayorov, R. McCarthy, R. McCroskey, T. R. McMahon, D. Meder, H. L. Melanson, A. Melnitchouk, X. Meng, M. Merkin, K. W. Merritt, A. Meyer, C. Miao, H. Miettinen, D. Mihalcea, C. S. Mishra, J. Mitrevski, N. Mokhov, J. Molina, N. K. Mondal, Hugh Montgomery, R. W. Moore, M. Mostafá, G. S. Muanza, M. Mulders, Y. D. Mutaf, F. Nang, M. Narain, V. S. Narasimham, N. A. Naumann, H. A. Neal, J. P. Negret, S. Nelson, P. Neustroev, C. Noeding, A. Nomerotski, S. F. Novaes, T. Nunnemann, E. Nurse, V. O’Dell, D. C. O’Neil, V. Oguri, N. Oliveira, N. Oshima, G. J. Otero y Garzón, P. Padley, K. Papageorgiou, N. Parashar, J. Park, S. K. Park, J. A. Parsons, R. Partridge, N. Parua, A. Patwa, P. M. Perea, E. Perez, O. Peters, P. Pétroff, M. Petteni, L. Phaf, R. Piegaia, P. L. M. Podesta-Lerma, V. M. Podstavkov, B. G. Pope, E. Popkov, W. L. Prado da Silva, H. Prosper, S. Protopopescu, M. Przybycień, J. Qian, A. Quadt, B. Quinn, K. J. Rani, P. A. Rapidis, P. N. Ratoff, N. W. Reay, J.-F. Renardy, S. Reucroft, J. Rha, M. Ridel, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, C. Royon, P. Rubinov, R. Ruchti, B. Sabirov, G. Sajot, A. Sánchez-Hernández, M. P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, R. D. Schamberger, H. Schellman, P. Schieferdecker, C. Schmitt, A. A. Schukin, R. Schwienhorst, Soumitra SenGupta, E. Shabalina, V. Shary, W. D. Shephard, D. Shpakov, R. A. Sidwell, V. Šimák, V. Sirotenko, D. Skow, P. Slattery, R. P. Smith, K. Smolek, G. R. Snow, J. Snow, S. Söldner‐Rembold, X. Song, Y. Song, L. Sonnenschein, A. Sopczak, V. Sorı́n, M. Sosebee, K. Soustružnı́k, M. Souza, N. R. Stanton, J. Stark, J. Steele, G. Steinbrück, K. Stevenson, V. Stolin, A. Stone, D. A. Stoyanova, J. Strandberg, M. A. Strang, M. Strauss, R. Ströhmer, M. Strovink, L. Stutte, A. Sznajder, M. Talby, P. Tamburello, W. Taylor, P. Telford, J. Temple, S. Tentindo-Repond, E. Thomas, B. Thooris, M. Tomoto, T. Toole, J. Torborg, S. Towers, T. Trefzger, S. Trincaz-Duvoid, T. G. Trippe, B. Tuchming, C. Tully, A. S. Turcot, P. M. Tuts, S. Uvarov, S. Uzunyan, B. Vachon, R. Van Kooten, W. M. van Leeuwen, N. Varelas, E. W. Varnes, Igor Vasilyev, M. Vaupel, P. Verdier, L. S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, J.-R. Vlimant, E. von Toerne, M. Vreeswijk, T. Vu Anh, H. D. Wahl, R. Walker, N. B. Wallace, Z.-M. Wang, J. Warchol, M. Warsinsky, G. Watts, M. Wayne, M. Weber, H. Weerts, M. Wegner, M. J. White, V. White, D. Whiteson, D. Wicke, D. A. Wijngaarden, G. Wilson, S. J. Wimpenny, J. Wittlin, T. Wlodek, M. Wobisch, J. Womersley, D. Wood, Z. Wu, T. R. Wyatt, Q. Xu, N. Xuan, R. Yamada, T. Yasuda, Y. A. Yatsunenko, Y. Yen, K. Yip, S. W. Youn, J. Yu, A. Yurkewicz, A. Zabi, A. Zatserklyaniy, M. Zdrazil, C. Zeitnitz, B. Zhang, D. Zhang, X. Zhang, T. Zhao, Z. Zhao, Hao Zheng, B. Zhou, Z. Zhou, J. Zhu, M. Zieliński, D. Ziemińska, A. Ziemiński, R. Zitoun, V. Zutshi, E. G. Zverev, A. Zylberstejn
Bibliographic record
VenuePhysical Review Letters · 2004
Typearticle
Languagelv
FieldPhysics and Astronomy
TopicParticle physics theoretical and experimental studies
Canadian institutionsSimon Fraser UniversityUniversity of Alberta
Fundersnot available
KeywordsX(3872)PhysicsParticle physicsState (computer science)HadronAnalytical Chemistry (journal)AlgorithmChemistryComputer science
Abstract
We report the observation of the $X(3872)$ in the $J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ channel, with $J/\ensuremath{\psi}$ decaying to ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{T}\mathrm{e}\mathrm{V}$. Using approximately $230\text{ }\text{ }{\mathrm{p}\mathrm{b}}^{\ensuremath{-}1}$ of data collected with the Run II D0 detector, we observe $522\ifmmode\pm\else\textpm\fi{}100$ $X(3872)$ candidates. The mass difference between the $X(3872)$ state and the $J/\ensuremath{\psi}$ is measured to be $774.9\ifmmode\pm\else\textpm\fi{}3.1(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\ifmmode\pm\else\textpm\fi{}3.0(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$. We have investigated the production and decay characteristics of the $X(3872)$ and find them to be similar to those of the $\ensuremath{\psi}(2S)$ state.
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)0.002
metaresearch head score (Gemma)0.012
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: none
GenreCandidate signal: Empirical · Consensus signal: none
Teacher disagreement score0.040
Threshold uncertainty score0.133
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.012 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.002 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.005 | 0.011 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.040 | 0.021 |
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 head0.020
GPT teacher head0.249
Teacher spread0.229 · 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
Citations554
Published2004
Admission routes1
Has abstractyes