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Measurement of the helicity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>W</mml:mi></mml:math>bosons in top-quark decays
A. Abulencia, D. Acosta, J. Adelman, A. A. Affolder, T. Akimoto, M. G. Albrow, D. Ambrose, S. Amerio, D. Amidei, A. Anastassov, K. Anikeev, A. Annovi, J. Antoš, M. Aoki, G. Apollinari, J-F. Arguin, T. Arisawa, A. Artikov, W. Ashmanskas, A. Attal, F. Azfar, P. Azzi, P. Azzurri, H. Bachacou, W. Badgett, A. Barbaro‐Galtieri, V. E. Barnes, B. A. Barnett, S. Baroiant, V. Bartsch, G. Bauer, F. Bedeschi, S. Behari, S. Belforte, G. Bellettini, J. Bellinger, A. Belloni, E. Ben-Haim, D. Benjamin, A. Beretvas, J. Beringer, T. Berry, A. Bhatti, M. Binkley, D. Bisello, M. Bishai, R. E. Blair, C. Blocker, K. Bloom, B. Blumenfeld, A. Bocci, A. Bodek, V. Boisvert, G. Bolla, A. Bolshov, D. Bortoletto, J. Boudreau, S. Bourov, A. Boveia, B. Brau, C. Bromberg, E. Brubaker, J. Budagov, H. S. Budd, S. Budd, K. Burkett, G. Busetto, P. Bussey, K. L. Byrum, M. Campanelli, M. Campbell, F. Canelli, A. Canepa, D. Carlsmith, R. Carosi, S. Carron, M. Casarsa, A. Castro, P. Catastini, D. Cauz, F. Šforza, A. Cerri, Spencer Chang, J. D. Chapman, Y. C. Chen, M. Chertok, G. Chiarelli, G. Chlachidze, F. Chlebana, I. Cho, K. Cho, D. Chokheli, J. P. Chou, P.-H. Chu, S. H. Chuang, K. Chung, W. H. Chung, Y. S. Chung, M. Ciljak, C. I. Ciobanu, M. A. Ciocci, A. Clark, D. Clark, M. Coca, A. Connolly, M. E. Convery, J. Conway, B. D. Cooper, K. Copic, M. Cordelli, G. Cortiana, A. Cruz, J. Cuevas, R. Culbertson, D. Cyr, S. DaRonco, S. D’Auria, M. D’Onofrio, D. Dagenhart, P. de Barbaro, S. De Cecco, A. Deisher, G. De Lentdecker, M. Dell’Orso, S. Demers, L. Demortier, J. Deng, M. Deninno, D. De Pedis, P. F. Derwent, C. Dionisi, J. Dittmann, P. DiTuro, C. Dörr, A. Dominguez, S. Donati, M. Donegà, P. Dong, J. Donini, T. Dorigo, S. Dube, K. Ebina, J. Efron, J. Ehlers, R. Erbacher, D. Errede, S. Errede, R. Eusebi, H. C. Fang, S. M. Farrington, I. Fedorko, W. Fedorko, R. G. Feild, M. Feindt, J. P. Fernández, Richard Field, G. Flanagan, L. R. Flores Castillo, A. Foland, S. Forrester, G. W. Foster, M. Franklin, J. Freeman, Y. Fujii, I. K. Furic, A. Gajjar, M. Gallinaro, J. Galyardt, F. García, M. Garcia Sciveres, A. F. Garfinkel, C. Gay, H. Gerberich, E. Gerchtein, D. W. Gerdes, S. Giagu, P. Giannetti, S. M. Gibson, K. Gibson, C. M. Ginsburg, K. Giolo, M. P. Giordani, M. Giunta, G. Giurgiu, V. Glagolev, D. Glenzinski, M. Gold, N. Goldschmidt, J. Goldstein, G. Gómez, G. Gomez Ceballos, M. Goncharov, I. Gorelov, A. T. Goshaw, Y. Gotra, K. Goulianos, A. Gresele, M. Griffiths, S. Grinstein, C. Grosso-Pilcher, U. Grundler, J. Guimarães da Costa, C. Haber, S. R. Hahn, K. I. Hahn, E. Halkiadakis, A. Hamilton, B.-Y. Han, R. Handler, F. Happacher, K. Hara, M. Hare, S. Harper, R. Harr, R. M. Harris, K. Hatakeyama, C. P. Hays, H. S. Hayward, A. Heijboer, B. Heinemann, J. J. Heinrich, M. Hennecke, M. Herndon, X. He, D. Hidas, C. S. Hill, D. Hirschbuehl, A. Höcker, A. Holloway, S. Hou, M. Houlden, S.‐C. Hsu, T. B. Huffman, R. E. Hughes, J. Huston, K. Ikado, J. Incandela, G. Introzzi, M. Iori, Y. Ishizawa, A. Ivanov, B. Iyutin, E. James, D. Jang, B. Jayatilaka, D. Jeans, H. Jensen, E. J. Jeon, M. Jones, K. K. Joo, S. Y. Jun, T. R. Junk, T. Kamon, J. S. Kang, M. Karagoz-Unel, P. E. Karchin, Y. Kato, Y. Kemp, R. Kephart, U. Kerzel, V. Khotilovich, B. Kilminster, D. H. Kim, H. S. Kim, J. E. Kim, M. J. Kim, M. S. Kim, S. B. Kim, S. H. Kim, Y. K. Kim, M. Kirby, L. Kirsch, S. Klimenko, M. Klute, B. Knuteson, B. R. Ko, H. Kobayashi, K. Kondo, D. J. Kong, J. Konigsberg, K. Kordas, A. Korytov, A. V. Kotwal, A. Kovalev, J. Kraus, Ilya Kravchenko, M. Kreps, A. Kreymer, J. Kroll, N. Krumnack, M. Kruse, V. Krutelyov, S. E. Kuhlmann, Y. Kusakabe, S. Kwang, A. T. Laasanen, S. Lai, S. Lami, S. Lammel, M. Lancaster, R. L. Lander, K. Lannon, A. Lath, G. Latino, I. Lazzizzera, C. Lecci, T. LeCompte, J. Lee, S. W. Lee, R. Lefèvre, N. Leonardo, S. Leone, S. Levy, J. D. Lewis, K. Li, C. Lin, C. S. Lin, M. Lindgren, E. Lipeles, T. M. Liss, A. Lister, D. O. Litvintsev, T. Liu, Y. Liu, A. Loginov, M. Loreti, P. Loverre, R.-S. Lu, D. Lucchesi, P. Lujan, P. Lukens, G. Lungu, L. Lyons, J. Lys, R. Lysák, E. Lytken, P. Mack, D. MacQueen, R. Madrak, K. Maeshima, P. Maksimovic, G. Manca, F. Margaroli, R. Marginean, C. P. Marino, A. J. Martin, M. Aldaya Martin, V. Martin, M. Martı́nez, T. Maruyama, H. Matsunaga, M. E. Mattson, R. Mazini, P. Mazzanti, K. S. McFarland, D. McGivern, P. McIntyre, Peter McNamara, B. Meadows, A. Mehta, S. Menzemer, A. Menzione, P. Merkel, C. Mesropian, A. Messina, M. von der Mey, T. Miao, N. Miladinovic, J. Miles, Robert F. Miller, J. S. Miller, C. Mills, M. Milnik, R. Miquel, S. Miscetti, G. Mitselmakher, A. Miyamoto, N. Moggi, B. Mohr, R. W. Moore, M. J. Morello, P. Movilla Fernandez, J. Mülmenstädt, A. Mukherjee, M. Mulhearn, T. Müller, R. Mumford, P. Murat, J. Nachtman, S. Nahn, I. Nakano, A. Napier, D. Naumov, V. Necula, C. Neu, M. S. Neubauer, J. Nielsen, T. Nigmanov, L. Nodulman, O. Norniella, T. Ogawa, S. H. Oh, Y. D. Oh, T. Okusawa, R. Oldeman, R. Orava, K. Österberg, C. Pagliarone, R. Paoletti, V. Papadimitriou, A. Papikonomou, A. Paramonov, B. Parks, S. Pashapour, J. Patrick, G. Pauletta, M. Paulini, C. Paus, D. E. Pellett, A. Penzo, T. J. Phillips, G. Piacentino, K. Pitts, C. Plager, L. Pondrom, G. Pope, X. Portell, O. Poukhov, N. Pounder, F. Prakoshyn, A. Pronko, J. Proudfoot, F. Ptohos, G. Punzi, J. Pursley, J. Rademacker, A. Rahaman, A. Rakitin, S. Rappoccio, F. Ratnikov, B. Reisert, V. Reković, N. van Remortel, P. Renton, M. Rescigno, S. Richter, F. Rimondi, L. Ristori, W. J. Robertson, A. Robson, T. Rodrigo, E. Rogers, S. Rolli, R. Roser, M. Rossi, R. Rossin, C. Rott, A. Ruiz-Jimeno, J. Russ, V. Rusu, D. Ryan, H. Saarikko, S. Sabik, A. Safonov, W. K. Sakumoto, G. Salamanna, O. Saltó, D. Saltzberg, C. Sánchez, L. Santi, S. Sarkar, K. Satô, P. Savard, A. Savoy-Navarro, T. Scheidle, P. Schlabach, E. E. Schmidt, M. P. Schmidt, M. Schmitt, Thomas Schwarz, L. Scodellaro, A. L. Scott, A. Scribano, F. Scuri, A. Sedov, S. C. Seidel, Y. Seiya, A. Semenov, F. Semeria, L. Sexton-Kennedy, I. Sfiligoi, M. Shapiro, T. Shears, P. F. Shepard, D. Sherman, M. Shimojima, M. J. Shochet, Y. Shon, I. Shreyber, A. Sidoti, A. Sill, A. Sisakyan, J. Sjölin, A. Skiba, A. J. Slaughter, K. Śliwa, D. Smirnov, J. R. Smith, F. D. Snider, R. Snihur, M. Söderberg, A. Soha, S. Somalwar, V. Sorı́n, J. Spalding, F. Spinella, P. Squillacioti, M. Stanitzki, A. Staveris-Polykalas, R. St. Denis, B. Stelzer, O. Stelzer-Chilton, D. Stentz, J. Strologas, D. Stuart, J. S. Suh, A. Sukhanov, K. Sumorok, H. Sun, T. Suzuki, A. Taffard, R. Tafirout, R. Takashima, Y. Takeuchi, K. Takikawa, M. Tanaka, R. Tanaka, M. Tecchio, P. K. Teng, K. Terashi, S. Tether, J. Thom, A. S. Thompson, E. Thomson, P. Tipton, V. Tiwari, S. Tkaczyk, D. Toback, K. Tollefson, T. Tomura, D. Tonelli, M. Tönnesmann, S. Torre, D. Torretta, S. Tourneur, W. Trischuk, R. Tsuchiya, S. Tsuno, N. Turini, F. Ukegawa, T. Unverhau, S. Uozumi, D. Usynin, L. Vacavant, A. Vaiciulis, S. Vallecorsa, A. Varganov, E. Vataga, G. Velev, G. Veramendi, V. Veszpremi, T. Vickey, R. Vidal, I. Vila, I. Vollrath, I. Volobouev, F. Würthwein, P. Wagner, R. G. Wagner, R. L. Wagner, W. Wagner, R. Wallny, T. Walter, Z. Wan, M. J. Wang, S. M. Wang, A. Warburton, B. F. L. Ward, S. Waschke, D. Waters, T. Watts, M. Weber, W. C. Wester, B. Whitehouse, M. J. White, A. B. Wicklund, E. Wicklund, H. H. Williams, P. Wilson, B. L. Winer, P. Wittich, S. Wolbers, C. Wolfe, S. D. Worm, T. Wright, X. Wu, S. M. Wynne, A. Yagil, K. Yamamoto, J. Yamaoka, Y. Yamashita, C. Yang, U. K. Yang, W.-M. Yao, G. P. Yeh, J. Yoh, K. Yorita, T. Yoshida, I. Yu, S. S. Yu, J. C. Yun, L. Zanello, A. Zanetti, Ingyin Zaw, F. Zetti, X. Zhang, J. Zhou, S. Zucchelli
Bibliographic record
VenuePhysical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2006
Typearticle
Languageen
FieldPhysics and Astronomy
TopicParticle physics theoretical and experimental studies
Canadian institutionsMcGill UniversityInstitute of Particle PhysicsUniversity of Toronto
FundersScience and Technology Facilities Council
KeywordsMathematicsPhysicsAlgorithmParticle physics
Abstract
We measure the branching fraction of the top quark to longitudinally and right-handed polarized $W$ bosons, ${F}_{0}$ and ${F}_{+}$, using approximately $200\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of $\overline{p}p$ collisions collected by the CDF II detector. We analyze two quantities sensitive to the $W$ helicity: the invariant mass of the charged lepton and the bottom-quark jet in the decay $t\ensuremath{\rightarrow}Wb\ensuremath{\rightarrow}\ensuremath{\ell}\ensuremath{\nu}b$ (where $\ensuremath{\ell}=e$ or $\ensuremath{\mu}$), and the transverse momentum of the charged lepton. Constrained fits yield ${F}_{0}={0.74}_{\ensuremath{-}0.34}^{+0.22}$, and ${F}_{+}<0.27$ at the 95% confidence level. These measurements are consistent with the standard model predictions.
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)0.001
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 score0.006
Threshold uncertainty score0.012
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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 head0.295
Teacher spread0.277 · 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".
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Citations35
Published2006
Admission routes1
Has abstractyes