共查询到6条相似文献,搜索用时 15 毫秒
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We investigate the physics potential of the annihilation decays
in the standard model and beyond. In a naive factorization approach, the branching ratios are estimated to be
and
. In the framework of QCD factorization, we compute the non-factorizable corrections and get
,
. Future measurements of these decays would be useful for testing the factorization frameworks. The smallness of these decays in the SM makes them sensitive probes of new physics. As an example, we will consider the possible admixture of the (V + A) charge current to the standard (V-A) current. This admixture will give a significant contribution to the decays.Received: 29 August 2003, Revised: 17 January 2004, Published online: 19 March 2004Corresponding author: Y.D. Yang 相似文献
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P. Huovinen 《The European Physical Journal A - Hadrons and Nuclei》2008,37(1):121-128
We study the effect of separate chemical and kinetic freeze-outs to the ideal hydrodynamical flow in Au + Au collisions at
RHIC ( energy). Unlike earlier studies we explore how these effects can be counteracted by changes in the initial state of the hydrodynamical
evolution. We conclude that the reproduction of pion, proton and antiproton yields necessitates a chemical freeze-out temperature
of T ≈ 150MeV instead of T = 160–170 MeV motivated by thermal models. Contrary to previous reports, this lower temperature makes it possible to reproduce
the p
T spectra of hadrons if one assumes very small initial time, τ
0 = 0.2 fm/c. However, the p
T differential elliptic flow, v
2(p
T) remains badly reproduced. This points to the need to include dissipative effects (viscosity) or some other refinement to
the model. 相似文献
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International Journal of Theoretical Physics - At high energy hadron collider, the dominant production mechanism for heavy baryons is actually the fragmentation. We analytically have computed the... 相似文献
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Abe F Albrow M Amidei D Anway-Wiese C Apollinari G Atac M Auchincloss P Azzi P Bacchetta N Baden AR Badgett W Bailey MW Bamberger A de Barbaro P Barbaro-Galtieri A Barnes VE Barnett BA Bauer G Baumann T Bedeschi F Behrends S Belforte S Bellettini G Bellinger J Benjamin D Benlloch J Bensinger J Beretvas A Berge JP Bertolucci S Biery K Bhadra S Binkley M Bisello D Blair R Blocker C Bodek A Bolognesi V Booth AW Boswell C Brandenburg G Brown D Buckley-Geer E Budd HS Busetto G Byon-Wagner A 《Physical review D: Particles and fields》1994,50(7):4252-4257
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Abe F Albrow M Amidei D Anway-Wiese C Apollinari G Areti H Auchincloss P Azfar F Azzi P Bacchetta N Badgett W Bailey MW Bao J de Barbaro P Barbaro-Galtieri A Barnes VE Barnett BA Bartalini P Bauer G Baumann T Bedeschi F Behrends S Belforte S Bellettini G Bellinger J Benjamin D Benlloch J Benton D Beretvas A Berge JP Bertolucci S Bhatti A Biery K Binkley M Bird F Bisello D Blair RE Blocker C Bodek A Bolognesi V Bortoletto D Boswell C Boulos T Brandenburg G Buckley-Geer E Budd HS Burkett K 《Physical review letters》1994,73(2):220-224