[La recherche du boson de Higgs]
Au cours de ses douze années de fonctionnement, LEP a revolutionné la connaissance de la brisure de symétrie électrofaible dans le cadre du modèle standard. La découverte directe du boson de Higgs en aurait été le couronnement. Les recherches au pic du Z et au-delà du seuil de production de paires de W ont permis d'exclure de manière non ambiguë toute masse en dessous de 114.1 GeV·c−2. Après des années d'efforts, les performances de LEP ont fini par dépasser les limites de ce que l'on croyait possible. Alors, les premiers signes de ce qui pourrait bien être un boson de Higgs de 115 GeV·c−2 commencèrent à apparaı̂re en juin 2000, furent confirmés en septembre, et confirmés à nouveau en novembre. Le cas échéant, six mois de plus auraient suffi pour transformer ces indices en une découverte d'importance fondamentale.
For twelve years, LEP revolutionized the knowledge of electroweak symmetry breaking within the standard model, and the direct discovery of the Higgs boson would have been the crowning achievement. Searches at the Z resonance and above the W+W− threshold allowed an unambiguous lower limit on the mass of the standard model Higgs boson to set be at 114.1 GeV·c−2. After years of efforts to push the LEP performance far beyond the design limits, hints of what could be the first signs of the existence of a 115 GeV·c−2 Higgs boson appeared in June 2000, were confirmed in September, and were then confirmed again in November. An additional six-month period of LEP operation was enough to provide a definite answer, with an opportunity to make a fundamental discovery of prime importance.
Accepté le :
Publié le :
Mot clés : boson de Higgs, recherche, limite, 115 GeV·c−2, LEP, CERN
Patrick Janot 1 ; Marumi Kado 2
@article{CRPHYS_2002__3_9_1193_0, author = {Patrick Janot and Marumi Kado}, title = {Direct search for the {Standard} {Model} {Higgs} boson}, journal = {Comptes Rendus. Physique}, pages = {1193--1202}, publisher = {Elsevier}, volume = {3}, number = {9}, year = {2002}, doi = {10.1016/S1631-0705(02)01399-3}, language = {en}, }
Patrick Janot; Marumi Kado. Direct search for the Standard Model Higgs boson. Comptes Rendus. Physique, Volume 3 (2002) no. 9, pp. 1193-1202. doi : 10.1016/S1631-0705(02)01399-3. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/S1631-0705(02)01399-3/
[1] High precision tests and determination of the top quark and Higgs boson masses, C. R. Physique, Volume 3 (2002), p. 1183
[2] Phys. Lett. B, 435 (1998), p. 427
[3] Looking for New Physics beyond the Standard Model, C. R. Physique, Volume 3 (2002), p. 1235
[4] The Higgs Hunter's Guide, Addison-Wesley, 1990
[5] P.J. Franzini, et al., in: G. Altarelli, R. Kleiss, C. Verzegnassi (Eds.), Z Physics at LEP, CERN-89-08, Vol. II, p. 59
[6] Phys. Lett. B, 222 (1989), p. 533
[7] et al. Phys. Lett. B, 235 (1990), p. 356
[8] Phys. Rev. D, 40 (1989), p. 712
[9] et al. CUSB Collaboration, Proc. of the XXIVth Int. Conf. on High Energy Physics, Munich, August 4–10, 1988
[10] Phys. Lett. B, 219 (1989), p. 503
[11] Phys. Lett. B, 229 (1989), p. 150
[12] The Standard Model of particle physics, C. R. Physique, Volume 3 (2002), p. 1097
[13] et al. ALEPH Collaboration, Phys. Lett. B, Volume 245 (1990), p. 289
[14] et al. OPAL Collaboration, Phys. Lett. B, Volume 251 (1990), p. 211
[15] et al. L3 Collaboration, Phys. Lett. B, Volume 252 (1990), p. 518
[16] et al. DELPHI Collaboration, Nucl. Phys. B, Volume 243 (1990), p. 341
[17] et al. ALEPH Collaboration, Phys. Lett. B, Volume 313 (1993), p. 312
[18] et al. ALEPH Collaboration, Phys. Lett. B, Volume 334 (1994), p. 244
[19] et al. ALEPH Collaboration, Phys. Lett. B, Volume 384 (1996), p. 427
[20] et al. OPAL Collaboration, Z. Phys. C, Volume 73 (1997), p. 189
[21] et al. L3 Collaboration, Phys. Lett. B, Volume 385 (1996), p. 454
[22] et al. DELPHI Collaboration, Nucl. Phys. B, Volume 421 (1994), p. 3
[23] Nucl. Phys. B, 38 (1995) no. Proc. Suppl., p. 264
[24] Priorities for LEP in 2000, Proc. of the Workshop on LEP/SPS performance, Chamonix, 17–21 January 2000, CERN-SL-2000-007 DI, 2000
[25] et al. ALEPH Collaboration, Phys. Lett. B, Volume 499 (2001), p. 53
[26] et al. DELPHI Collaboration, Eur. Phys. J., Volume 23 (2002), p. 409
[27] et al. L3 Collaboration, Phys. Lett. B, Volume 508 (2001), p. 225
[28] The LEP Higgs working group, CERN-EP/2000-055, 2000
[29] The LEP Higgs working group, CERN-EP/2001-055, 2001, contribution to EPS 2001 and LP'01 Summer Conferences
[30] et al. ALEPH Collaboration, Phys. Lett. B, Volume 495 (2000), p. 1
[31] The LEP Higgs working group, Standard Model Higgs boson at LEP: Results with the 2000 data, Request for running in 2001. See http://alephwww.cern.ch/~janot/LEPCO/lephwg.ps
[32] The LEP Higgs working group, Frequently asked questions (and their answers). See http://alephwww.cern.ch/~janot/LEPCO/qanda.ps
[33] et al. ALEPH Collaboration, Phys. Lett. B, Volume 526 (2002), p. 191
[34] et al. DELPHI Collaboration, Phys. Lett. B, Volume 499 (2001), p. 23
[35] et al. L3 Collaboration, Phys. Lett. B, Volume 495 (2000), p. 18
[36] et al. L3 Collaboration, Phys. Lett. B, Volume 517 (2001), p. 319
[37] et al. OPAL Collaboration, Phys. Lett. B, Volume 499 (2001), p. 38
Cité par Sources :
Commentaires - Politique