نتایج جستجو برای: s mass production p
تعداد نتایج: 2718530 فیلتر نتایج به سال:
Studies of hadronic systems involving double strangeness (S = -2) are practically limited to searches for the Hparticle, a system of B = 2, S = -2, first proposed by Jaffe [1] which up to now was not observed. Apart from this exotic object the measurement of the interaction in hadronic systems with double strangeness is of general QCD interest and will result in a better understanding of the st...
The nucleosynthesis of proton-rich isotopes is calculated for multi-dimensional Chandrasekhar-mass models of Type Ia supernovae with different metallicities. The predicted abundances of the short-lived radioactive isotopes Nb, Tc, and Sm are given in this framework. The abundance seeds are obtained by calculating s-process nucleosynthesis in the material accreted onto a carbon-oxygen white dwar...
This document describes the search for 2 nd-generation leptoquarks (LQ 2) in about 104 pb£ 1 of p ¯ p collisions, recorded with the DØ detector between September 2002 and June 2003 at a center-of-mass energy of ¤ s ¥ 1¦ 96 TeV. The predictions of the Standard Model and models including scalar leptoquark production are compared to the data for various kinematic distributions. Since no excess of ...
It is shown that the striking energy variation in the p d → 3He η cross section near threshold is probably due to a final state interaction associated with a large (complex) η − 3He scattering length. The consequences of this hypothesis are studied for the production of the meson in the η − 4He and η − 7Be channels. PACS number(s): 25.40.Ve, 13.75.-n, 25.10.+s The cross sections for the product...
Article history: Received 12 October 2015 Received in revised form 12 November 2015 Accepted 21 December 2015 Available online 31 December 2015 Editor: L. Rolandi The production of electrons from heavy-flavour hadron decays was measured as a function of transverse momentum (pT) in minimum-bias p–Pb collisions at √ sNN = 5.02 TeV using the ALICE detector at the LHC. The measurement covers the pT...
The enzyme-substrate complex is inherently transient, rendering its detection difficult. In our framework designed for bisubstrate systems-isotope-labeled, activity-based identification and tracking (IsoLAIT)-the common substrate, such as S-adenosyl-l-methionine (AdoMet) for methyltransferases, is replaced by an analogue (e.g., S-adenosyl-l-vinthionine) that, as a probe, creates a tightly bound...
We present a search for electroweak production of single top quarks in ≈90 pb −1 of data collected with the DØ detector at the Fermilab Tevatron collider. Using arrays of neural networks to separate signals from backgrounds, we set upper limits on the cross sections of 17 pb for the s-channel process p¯ p → tb + X, and 22 pb for the t-channel process p¯ p → tqb + X, both at the 95% confidence l...
A search for charginos and neutralinos, predicted by supersymmetric theories, is performed using a data sample of 182.1 pb−1 taken at a centre-of-mass energy of 189 GeV with the OPAL detector at LEP. No evidence for chargino or neutralino production is found. Upper limits on chargino and neutralino pair production (χ̃1 χ̃ − 1 , χ̃ 0 1χ̃ 0 2) cross-sections are obtained as a function of the chargino...
We report on QCD radiative corrections to the process p¯ p → Zb ¯ b in the approximation in which the b quark is considered massless. The implementation of this process in the general purpose Monte Carlo program MCFM is discussed in some detail. These results are used to investigate backgrounds to Higgs boson production in the ZH channel. We investigate the Higgs mass range (100 GeV < m H < 130...
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