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Brisure CP/T via les produits triples dans les desintegrations des hadrons a saveur de beaute (French and English text).

机译:CP / T在美味强子的衰变中突破了三重产物(法文和英文文本)。

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摘要

This thesis is comprised of four articles, all of which have been published. The main subject is the study, in and beyond the standard model of particle physics, of CP/T-violation via triple products in decays of hadrons containing a b quark (B mesons or Λ b hyperons).; In the first article, we study, within the standard model (SM), the inclusive mode bsuū. We look for triple product asymmetries (TP's), which break T (time reversal symmetry). We then mention possible applications at the hadron level. Only two TP's give non-negligible asymmetries. We find an asymmetry of about 5% for p&ar;u˙ s&ar;u×s&ar; u&d1; or p&ar;u&d1; ˙s&ar;u ×s&ar;u&d1; , and between 1% and 3% for s&ar;b˙ p&ar;u×p&ar; s . The asymmetries are negligible for all other triple products. These results allow one to test the SM and to search for evidence of physics beyond the SM (“new physics”).; In the second article, we calculate, within the standard model, T-violating triple product asymmetries in charmless Λb decays using the factorization model. We focus on modes where the Λ b decays into a light spin-1/2 baryon (F) with either a pseudoscalar (P) or a vector (V) boson. We find a large asymmetry (18%) for the decay Λ bpK, whose inclusive mode is bsuū. The asymmetry for the other modes of the class Λb FP is at most 5%.; The third article of this thesis consists of the search for T-violating signals via triple products within the context of new physics. We constructed an effective lagrangian for charmless Λb decays, with all possible dimension-6 terms. Using factorization, we calculated the contribution of these terms to the asymmetries. This allowed us to see which operator (hence which new-physics model) leads to large asymmetries.; The fourth article is a complement to the main subject of this thesis. It studies polarization and forward-backward asymmetries (which are not CP/T-violating) in the decay b → sτ+ τ, with both leptons polarized. Of a total of 31 asymmetries, 9 are measurable, that is, they exceed 10%. This study allows one to exhaustively test the SM exhaustively and to probe new physics by extracting the Wilson coefficients and the b-quark mass. (Abstract shortened by UMI.)
机译:本文由四篇文章组成,所有文章均已发表。主要课题是在粒子物理学的标准模型内外,通过含 b 夸克( B 的强子衰变中的三元积)研究CP / T违反介子或Λ b 超子)。在第一篇文章中,我们在标准模型(SM)中研究包容模式 b su&umacr; 。我们寻找三元乘积不对称(TP's),它会破坏T(时间反转对称)。然后,我们提到强子级的可能应用。只有两个TP给出了不可忽略的不对称性。我们发现 p &ar; u &dot; < fen lp =“ par”> s &ar; u × s &ar; u &d1; p &ar; < a> u &d1; &dot; s &ar; u × s &ar; u &d1; ,且介于1%对于 s &ar; b &dot; p &ar; u × p &ar ; s 。对于所有其他三元乘积,不对称性可以忽略不计。这些结果使人们能够测试SM并寻找SM以外的物理证据(“新物理学”)。在第二篇文章中,我们在标准模型中使用分解模型计算在无魅力的^ b 衰减中T违反三重乘积不对称性。我们关注的模式是Λ b 衰减为具有伪标量(P)或矢量(V)玻色子的轻旋1/2重子(F)。我们发现衰减Λ b pK -的不对称性很大(18%),其包含模式为 b su&umacr; 。类别^ b FP 的其他模式的不对称性最大为5%。本文的第三篇文章是在新物理学的背景下,通过三重乘积来寻找T违规信号。我们构建了一个有效的拉格朗日函数,用于无奇异的Λ b 衰变,具有所有可能的6维项。使用分解,我们计算了这些项对不对称性的贡献。这使我们能够看到哪个算子(因此,哪个新物理模型)会导致较大的不对称性。第四篇文章是对本文主要主题的补充。研究衰变 b →sτ + τ-中的极化和前后对称性(不违反CP / T)。两个轻子都极化了。在总共31个不对称中,有9个是可测量的,即超过10%。这项研究允许人们详尽地测试SM,并通过提取Wilson系数和 b 夸克质量来探究新的物理学。 (摘要由UMI缩短。)

著录项

  • 作者

    Bensalem, Wafia.;

  • 作者单位

    Universite de Montreal (Canada).;

  • 授予单位 Universite de Montreal (Canada).;
  • 学科 Physics Elementary Particles and High Energy.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 p.5007
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高能物理学;
  • 关键词

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