نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فیزیک، دانشگاه صنعتی اصفهان، صندوق پستی: 8415683111، اصفهان ـ ایران

چکیده

حالتِ تشدیدیِ (1405)‎Λ‎ (یا به اختصار Λ*‎) چند دهه است که هم از لحاظ نظری و هم از لحاظ تجربی مورد بررسی و بازنگری بوده است. هدف این مقاله بررسی نظری جرم و پهنای ذره‌ی ‎Λ*‎‎ از طریق محاسبات ماتریسِ گذار ‎T‎با استفاده از یک پتانسیل پدیده‌شناسی جداپذیر است. در محاسبات حاضر، احتمال تشکیلِ حالتِ Λ*‎‎ در واکنش‎K-d→Λ*‎+‎n→ (Σπ)0+n ‎ بررسی و نتایج محاسبات با داده‌های تجربی اولیه آزمایشِ 31‎E-‎ شتاب‌دهنده‌ی J-PARC‎، که مربوط به برخورد کائون منفی با تکانه GeV/c 1 با دوترون می‌باشد برازش، شده است. با توجه به نتیجه بهترین برازش، جرم و پهنای این حالت تشدیدی به ترتیب 2MeV/c 4/2±1419‎MΛ*=‎ و ‎ MeV‎ به‌دست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

Calculating formation cross section of Λ (1405) in Kaon-deuteron reaction: comparison to E31 data

نویسندگان [English]

  • M. Hassanvand
  • S. Shirinzadeh Varaghooli

Department of Nuclear Physics, Isfahan University of Technology, P.O.Box: 8415683111, Isfahan –Iran

چکیده [English]

The Λ*‎ resonance has been studied and investigated both theoretically and experimentally for decades‎. ‎The purpose of this paper is to study the mass and width of Λ* resonance state theoretically by calculating the T-matrix using a generalized optical potential with a Yukawa-type separable potential‎. ‎In the current calculation, the formation of Λ* in the K-d → Λ*‎ + ‎n → (Σπ)0 + n reaction is studied and the results of the analysis are fitted to the experimental data of E-31 carried out at J-PARC accelerator which is related to the collision of negative kaon of 1GeV/c momentum with liquid deuteron and according to the best fit‎, ‎mass and width of this resonant state calculated as MΛ* =1419 ± 2.4 MeV/c2 and , ‎respectively.

کلیدواژه‌ها [English]

  • Kaonic nuclear system‎
  • Λ (1405) resonance state‎
  • ‎Experimental data
  • E-31‎
  • ‎ J-PARC
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