Investigation of Quark–Antiquark Interaction Properties using Leading Particle Measurements in ee Annihilation
نویسنده
چکیده
Measurements of heavy quark production in electron–positron collisions are used to analyse the strong interactions between quarks and anti-quarks. A scaling behaviour is observed in distributions of the rapidity change of D, B, and B mesons. From these distributions information is obtained on the hadron formation time, effective quark masses, and the potential between quark–antiquark pairs. Predictions for fragmentation functions are presented. PACS: 13.65.+i
منابع مشابه
Determination of the Quark–Antiquark Interactions using Leading Particle Measurements
Measurements of heavy quark production in electron–positron collisions are used to analyse the strong interactions between quarks and anti-quarks. A scaling behaviour is observed in distributions of the rapidity change of D, B, and B mesons. From these distributions information is obtained on the hadron formation time, effective quark masses, and the potential between quark–antiquark pairs. Pre...
متن کاملMultiple Parton Scattering in Nuclei: Quark-quark Scattering
Modifications to quark and antiquark fragmentation functions due to quark-quark (antiquark) double scattering in nuclear medium are studied systematically up to order O(αs) in deeply inelastic scattering (DIS) off nuclear targets. At the order O(αs), twist-four contributions from quark-quark (antiquark) rescattering also exhibit the Landau-Pomeranchuck-Midgal (LPM) interference feature similar ...
متن کاملLeptoquark/Squark Interpretation of HERA Events: Virtual Effects in e+e− Annihilation to Hadrons
In reference to the recently observed high Q, large x events in deep-inelastic positron–proton scattering at HERA, various leptoquark and supersymmetric scenarios are discussed. We study the impact of virtual leptoquark or R-parity breaking squark exchange as well as generic contact interaction on the production of quark–antiquark pairs in ee annihilation, in particular at LEP2. ∗ Supported by ...
متن کاملO ct 1 99 8 A heavy quark effective field lagrangian keeping particle and antiparticle mixed sectors ∗
A heavy quark effective field lagrangian keeping particle and antiparticle mixed sectors * Abstract We examine the applicability of the heavy-quark effective field theory (HQEFT) to heavy quark-antiquark pair annihilation or creation processes. To this end, we keep the particle-antiparticle sector in the inverse heavy-quark mass expansion of the HQEFT Lagrangian. We show that by removing the la...
متن کاملNew Physics at HERA: Implications for e+e− Scattering at LEP2
The impact of virtual leptoquark or R-parity breaking squark exchange as well as generic contact interactions on the production of quark–antiquark pairs in ee annihilation, in particular at LEP2, is summarized. An exciting possibility of sneutrino formation in ee scattering is also mentioned. Talk presented at the 5th International Workshop on “Deep Inelastic Scattering and QCD” (DIS ’97), Chic...
متن کامل