Recent Results on Heavy Flavours with ALEPH

نویسنده

  • Fabrizio Palla
چکیده

The large sample of Z collected by ALEPH during the LEP1 consists of about 4.5 million hadronic decays. Out of them, about 1 million of bb̄ events allow to investigate rare processes which could help constraining the CKM mixing matrix, before the start of the new experiments at the B factories and hadronic colliders. In this report I will present the measurements of the B(b → ulνX) [1] which allows a measurement of the |Vub| CKM matrix element, the B(b → sγ) [2] and a study on the width difference between mass eigenstates in the Bs system.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Fragmentation Functions from Flavour-inclusive and Flavour-tagged e+e− Annihilations

Fitting Z-pole data from ALEPH and SLD, and TPC data at a lower c.m.s. energy, we fix the boundary condition for NLO parton→hadron (hadron= π, K, ∑ h h ) fragmentation functions (FFs) at the low resolution scale of the radiative parton model of Glück, Reya and Vogt (GRV). Perturbative LO↔NLO stability is investigated. The emphasis of the fit is on information on the fragmentation process for in...

متن کامل

Ep Physics with Heavy Flavours

Recent results from H1 and ZEUS on heavy flavour production at HERA are reviewed.

متن کامل

Heavy Flavours at Colliders

I review some topics in the production and decays of heavy flavours that are relevant for collider physics. In particular, I discuss the present status and some recent progress related to masses, parton densities and fragmentation functions of heavy quarks, as well as threshold resummation, polarized onium production at high transverse momentum, and a factorization theorem for B → ππ decays.

متن کامل

Heavy-Quark Effective Theory and Weak Matrix Elements

Recent developments in the theory of weak decays of heavy flavours are reviewed. Applications to exclusive semileptonic B decays, the semileptonic branching ratio and charm counting, beauty lifetimes, and hadronic B decays are discussed. Invited talk presented at the International Europhysics Conference on High Energy Physics Jerusalem, Israel, 19–26 August 1997 CERN-TH/98-2 January 1998 19: He...

متن کامل

Comparison of Information Retrieval Capabilities in Library Software of Payam, Voyager and Aleph

The purpose of this study was comparing Information Retrieval Capabilities in Web-based Library Software of Payam, with Voyager and ALEPH. A checklist designed and included six main trait for evaluation and comparing 73 scales. Data collected by experts' observing of the software's OPAC. Data analyzed by the descriptive statistics methods. Findings shows the preferences in search capabilities i...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1999