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Search for Charged Higgs Bosons at Centre-of-mass Energies of 189-209 GeV at LEP.
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2001 |
| Genre | : |
| ISBN | : |
A search for charged Higgs bosons at the Large Electron and Positron Collider (LEP) at CERN is presented. Specifically the decay of the charged Higgs boson (H^+/- ) into a CP-odd Higgs boson (A^0) and a virtual W boson (W^*) has been investigated at the OPAL detector. This decay channel can be very important depending on the theoretical model. The A^0 boson decays into b-quarks while the W^* boson can decay into two quarks or into a lepton and neutrino. Since charged Higgs bosons are assumed to be pair-produced at the LEP collider, the channel has at least eight jets. A decay of one of the charged Higgs bosons into a tau-lepton and its neutrino is also possible. This channel has at least four jets. Higgs boson mass limits are obtained in the context of Two-Higgs-Doublet-Models as a function of the model-parameters, tan(beta), m(H^+/- ) and m(A^0). The results are combined with those obtained from searches in which the charged Higgs boson decays only into cs or tau-lepton + neutrino. A lower limit of m(H^+/- )>60 GeV/c^2, independent of m(A^0), is obtained at tan(beta)=100. The largest excluded charged Higgs mass is 89 GeV/c^2 for m(A^0) around 45 GeV/c^2. Furthermore, results of the charged Higgs boson search of the four LEP experiments (ALEPH, DELPHI, L3 and OPAL) are combined, excluding the decay H^+/- -> W^* A^0. A lower mass limit of m(H^+/- )>79.8 GeV/c^2 is thereby achieved.
Search for charged Higgs bosons at LEP 2 collider
| Author | : Samo Stanič |
| Publisher | : |
| Total Pages | : 100 |
| Release | : 1999 |
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V Standardnem modelu močnih in elektrošibkih interakcij igrajo Higgsovi bozoni ključno vlogo, saj so glavni manjkajoči gradniki v sicer skladni zgradbi Standardnega modela osnovnih delcev in sil v naravi. Vsi osnovni delci, leptoni, kvarki in umeritveni bozoni dobijo mase preko sklopitev s Higgsovimi bozoni. Standardni model ima en sam nevtralen Higgsov bozon, nadgrajene različice pa zahtevajo poleg nevtralnih tudi nabite Higgsove bozone. Noben od modelov ne napoveduje mas Higgsovih bozonov, kar otežuje njihovo odkritje. V meritvah trkov elektronov in pozitronov pri težiščni energiji 183 GeV trkalniku LEP smo iskali razpade nabitih Higgsovih bozonov. Meritve so bile izvedene s spektrometrom DELPHI. Po nadgrajeni različici Standardnega modela parĹ nabiti Higgsovih bozonov pri trkih elektronov in pozitronov nastanejo preko izmenjave fotona ali nevtralnega šibkega bozona. Razpadejo bodisi hadronsko v pare kvarkov cs[s črto] ali leptonsko v delce [tau] in odgovarjajoče nevtrine. Ločevanje signala od ozadjaje bilo optimizirano s pomočjo simuliranih vzorcev razpadov nabitih Higgsovih bozonov in simuliranih vzorcev ostalih reakcij, ki predstavljajo ozadje. Glede na razpadna načina H[na]+ in H[na]- so bili izmerjeni podatki razvrščeni v hadronski, mešani in leptonski razpadni kanal. V različnih kanalih je analiza meritev potekala ločeno. Po izbiri kandidatov za razpade nabitih Higgsovih bozonov smo izmerjene reakcije primerjali s simuliranimi rekacijami, ki predstavljajo ozadje. Ker v nobenem izmed treh razpadnih kanalov ni bilo statistično signifikantnega presežka izmerjenih kandidatov nad pričakovanim ozadjem, smo izračunali zgornje meje za produkcijski presek para H[na]+ H[na]-, utežene z neznanimi vrednostmi razpadnih razvejitvenih razmerij. Meritve v vseh treh kanalih smo uporabili pri izračunu spodnje meje na masi nabitega Higgsovega bozona m[spodaj]H[plus minus], ki je s 95% odstotno stopnjo zanesljivosti večja od 53.5 GeV/c[na]2.
Perspectives On Supersymmetry Ii
| Author | : Gordon Kane |
| Publisher | : World Scientific |
| Total Pages | : 604 |
| Release | : 2010-04-14 |
| Genre | : Science |
| ISBN | : 9814464864 |
Supersymmetry is at an exciting stage of development. It extends the Standard Model of particle physics into a more powerful theory that both explains more and allows more questions to be addressed. Most importantly, it opens a window for studying and testing fundamental theories at the Planck scale. Experimentally we are finally entering the intensity and energy and sensitivity regions where superpartners and supersymmetric dark matter candidates are likely to be detected, and then studied. There has been progress in understanding the remarkable physics implications of supersymmetry, including the derivation of the Higgs mechanism, the unification of the Standard Model forces, cosmological connections such as a candidate for the cold dark matter of the universe and consequences for understanding the cosmological history of the universe, and more.This volume begins with an excellent pedagogical introduction to the physics and methods and formalism of supersymmetry which is accessible to anyone with a basic knowledge of the Standard Model of particle physics. Next is an overview of open questions, followed by chapters on topics such as how to detect superpartners and tools for studying them, the current limits on superpartner masses as we enter the LHC era, the lightest superpartner as a dark matter candidate in thermal and non-thermal cosmological histories, and associated Z' physics. Most chapters have been extended and updated from the earlier edition and some are new.This superb book will allow interested physicists to understand the coming experimental and theoretical progress in supersymmetry and the implications of discoveries of superpartners, and will also help students and workers to quickly learn new aspects of supersymmetry they want to pursue.
Lepton And Photon Interactions At High Energies: Lepton-photon 2003 - Proceedings Of The Xxi International Symposium
| Author | : Harry W K Cheung |
| Publisher | : World Scientific |
| Total Pages | : 575 |
| Release | : 2004-02-20 |
| Genre | : Science |
| ISBN | : 9814483516 |
This volume contains contributions to the XXI International Symposium on Lepton and Photon Interactions at High Energies, held at the Fermi National Accelerator Laboratory. It gives up-to-date reviews of all aspects of particle physics, written by leading practitioners in the field. The review nature of all the articles makes this volume more accessible to students and researchers in other fields of physics. In addition to new experimental data and advances in theory, the future directions and prospects for the field are covered.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings® (ISTP® / ISI Proceedings)• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)• CC Proceedings — Engineering & Physical Sciences
Proceedings Of The 29th International Conference On High Energy Physics: Ichep '98 (In 2 Volumes)
| Author | : Alan Astbury |
| Publisher | : World Scientific |
| Total Pages | : 1899 |
| Release | : 1999-06-11 |
| Genre | : Science |
| ISBN | : 9814644919 |
These proceedings consist of plenary rapporteur talks covering topics of major interest to the high energy physics community and parallel sessions papers which describe recent research results and future plans.
Search for Charged Higgs Bosons Decaying Via ${H^+ \to \T_{lep.} + \nu}$ in ${t\bar{t}}$ Events at ${\sqrt{s}
| Author | : William Dmitri Morgan Breaden Madden |
| Publisher | : |
| Total Pages | : 150 |
| Release | : 2012 |
| Genre | : Higgs bosons |
| ISBN | : |
