The contribution of Σ ∗ → Λ π to measured Λ polarization †
نویسندگان
چکیده
Calculations of the polarization of Λ and ¯ Λ particles after fragmentation of a polarized quark produced in processes like Z-decay and deep inelas-tic polarized lepton scattering must include Λ and ¯ Λ produced as decay products of Σ 0 and Σ * as well as those produced directly. These decay contributions are significant and not feasibly included in theoretical calculations based on QCD without additional input from other experimental data. Furthermore these contributions depend on the spin structure of the Σ 0 or Σ * and are not directly related to the structure function of the Λ
منابع مشابه
Kei Moriya IU Properties of the Λ(1405) Hyperon Studied at CLAS Using Photoproduction
The internal structure of the Λ(1405) hyperon has remained an unresolved mystery in hadron physics for decades. Observed as a resonance in Σπ just below the N-K threshold , it is the first excited Λ state; yet the nature of this resonance, where it belongs in the hierarchy of hyperons, and some of its basic properties, remain unsettled. In previous experiments, the invariant mass spectrum (line...
متن کاملA ug 2 00 6 STAR results on longitudinal spin dynamics
We present preliminary results on the double longitudinal spin asymmetries A LL in inclusive jet production and the longitudinal spin transfer asymmetries D LL in inclusive Λ and ¯ Λ hyperon production. The data amount to 0.5 pb −1 collected at RHIC in 2003 and 2004 with beam polarizations up to 45%. The jet A LL asymmetries, measured over 5 < p T < 17 GeV/c, are consistent with evaluations bas...
متن کاملبررسی برهمکنش کائون- دوترون و ساختار تشدید (1405) Λ با استفاده از روش فدیف
In this paper, we have investigated the kaon-deuteron interaction at an incident momentum of 1 GeV/c using the relativistic and non-relativistic Faddeev method for different phenomenological and chiral potentials. By calculating the π∑ invariant mass spectra on different particle channels, we have shown that the trace of Λ(1405) resonance is visible in such spectra. In the present work, the st...
متن کاملA Class of Dirichlet Series Integrals
In this note we extend the solution to a recent Monthly problem to analyze a broad class of Dirichlet series and illustrate the result in action in various ways. More precisely, in [6] the following integral evaluation is obtained: ∞ 0 3 − 2 √ 2 cos (t log 2) |ζ (1/2 + it)| 2 t 2 + 1/4 dt = π log 2. (1) This somewhat recondite-looking result transpires to be a case of a rather pretty class of e...
متن کاملSpin and flavor dependent parton distribution and fragmentation functions for octet baryons
I discuss the quark parton structure of octet baryons and the fragmentation of quarks into baryons in a spectator diquark model. The hyperfine interaction, responsible for the ∆-N and Σ-Λ mass splittings, leads not only to sizable SU(3) and SU(6) symmetry breaking in the quark distributions among the octet baryons but also to significant polarized non-strange quark distributions for the Λ. The ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000