مقالۀ پژوهشی: واپاشی مستقیم بوزون هیگز به مزون آپسیلون بطریق ترکش

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار، گروه فیزیک، دانشکده علوم، دانشگاه رازی، کرمانشاه، ایران

چکیده

یکی از مدهای غالب واپاشی بوزن هیگز مدل استاندارد، واپاشی آن به جفت    است که پس از این هریک از کوارک­های b و یا  می­توانند بطور مستقیم به مزون آپسیلون ترکش کنند. در این مقاله نسبت­های واپاشی مستقیم بوزون هیگز مدل استاندارد به مزون آپسیلون به روش ترکش مستقیم کوارک­های b و  محاسبه شده است. نتایج بدست آمده از محاسبات ما برای نسبت واپاشی بوزون هیگز به جفت آپسیلون برابر  است که سازگاری بسیار خوبی با مقدار اندازه­گیری شده آن در CMS که برابر  می­باشد، دارد. علاوه بر این نسبت انشعاب واپاشی مستقیم بوزون هگیز به جفت آپسیلون با قطبش طولی بدست آمده از محاسبات ما در مقایسه با واپاشی آن به جفت آپسلیون بدون قطبش13 درصد کاهش را نشان می­دهد که قابل مقایسه با 22 درصد کاهش گزارش شده توسط گروه CMS است. از این رو می­توان نتیجه گرفت که سهم غالب در واپاشی بوزون هیگز به مزون آپسیلون ترکش مستقیم کوارک  b و پادکوارک  می­باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Research Paper: Direct Decay of The Higgs Boson into Upsilon Meson via Fragmentation

نویسنده [English]

  • Tawfigh Osati
Assistant Professor, Department of Physics, Faculty of Science, Razi University, Kermanshah, Iran
چکیده [English]

One of the dominant modes of decay of the standard model Higgs boson is its decay into b  pair. Subsequently, either b or  can fragment directly into the upsilon meson. In this paper, the direct branching fractions of the standard model Higgs boson to the upsilon meson are calculated via direct fragmentation b and  quarks. The results obtained from our calculations show that, the decay ratio of the Higgs boson to the upsilon pair is equal to , which is a very good agreement with the value reported by CMS Collaboration which is equal to  . In addition, the direct decay branching fraction of the Higgs boson to the pair upsilon with longitudinal polarization from our calculations, compare to its decay to the unpolarization upsilon pair, it shows a 13% reduction, which is comparable to the 22% decrease is reported by the CMS Collaboration. Therefore, it can be concluded that the dominant contribution in the decay of the Higgs boson to the upsilon, is the direct fragmentation of the quark b and antiquark .  

کلیدواژه‌ها [English]

  • higgs boson
  • branching fraction
  • decay rate
  • fragmentation
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