Ref Arxiv: 1204.5315
Ref. & Cit.: NASA ADS
Résumé:

We consider the Z polarization asymmetry A_Z=(sigma(Z_R)-sigma(Z_L))/(sigma(Z_R)+sigma(Z_L)) in the process of associated bZ production at the LHC. We show that in the Standard Model (SM) this quantity is essentially given by its Born approximation, remaining almost unaffected by QCD scales and parton distribution functions variations as well as by electroweak corrections. The theoretical quantity that appears in A_Z is the same that provides the LEP1 Z -> b bbar forward-backward asymmetry, the only measured observable still in some contradiction with the SM prediction. In this sense, A_Z would provide the possibility of an independent verification of the possible SM discrepancy, which could reach, if consistency with LEP1 measurements is imposed, values of the relative ten percent size.

Commentaires: 10 pages, 5 eps figures

Ref HAL: hal-00777655_v1
Ref Arxiv: 1204.4121
DOI: 10.1103/PhysRevD.86.063524
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
6 citations
Commentaires: 6 pages, 3 figures. V2: minor changes to match the published version Journal: Phys. Rev. D 86, 063524 (2012)

Ref HAL: in2p3-00686368_v1
Ref Arxiv: 1204.1448
DOI: 10.1103/PhysRevD.85.114007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
7 citations
Commentaires: 14 pages, 7 figures, 3 tables

Ref HAL: hal-00682132_v1
Ref Arxiv: 1203.5048
Ref INSPIRE: 1094584
DOI: 10.1155/2012/625389
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
93 citations
Commentaires: 20 pages, 14 figures

Ref HAL: in2p3-00677468_v1
Ref Arxiv: 1203.1488
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Commentaires: 243 pages, report of the Les Houches 2011 New Physics Group

Ref HAL: hal-00608687_v1
Ref Arxiv: 1105.1925
DOI: 10.1103/PhysRevD.84.095005
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
111 citations
Commentaires: 55 pages, 9 figures, no major changes, references added, a comment added to sec 3.1, typos corrected

Ref Arxiv: 1004.5333
DOI: 10.1016/j.physletb.2010.09.007
Ref. & Cit.: NASA ADS
56 citations
Résumé:

We extract (for the first time) the ratio of the gluon condensate < g^3f_{abc}G^3 >/< alpha_s G^2 > expressed in terms of the liquid instanton radius rho_c from charmonium moments sum rules by examining the effects of < alpha_s G^2 > in the determinations of both rho_c and the running MS mass m_c(m_c). Using a global analysis of selected ratios of moments at different Q^2=0, 4m_c^2 and 8m_c^2 and taking < alpha_s G^2 > from 0.06 GeV^4, where the estimate of rho_c is almost independent of < alpha_s G^2 >, we deduce: rho_c=0.98(21) GeV^{-1} which corresponds to < g^3f_{abc}G^3 > = (31+- 13) GeV^2 < alpha_s G^2 >. The value of m_c(m_c) is less affected (within the errors) by the variation of < alpha_s G^2 >, where a common solution from different moments are reached for < alpha_s G^2 > greater than 0.02 GeV^4. Using the values of < alpha_s G^2 >=0.06(2) GeV^4 from some other channels and the previous value of < g^3f_{abc}G^3 >, we deduce: m_c(m_c)=1260(18) MeV and m_b(m_b)=4173(10) MeV, where an estimate of the 4-loops contribution has been included. Our analysis indicates that the errors in the determinations of the charm quark mass without taking into account the ones of the gluon condensates have been underestimated. To that accuracy, one can deduce the running light and heavy quark masses and their ratios evaluated at M_Z, where it is remarkable to notice the approximate equalities: m_s/m_u= m_b/m_s= m_t/m_b= 51(4), which might reveal some eventual underlying novel symmetry of the quark mass matrix in some Grand Unified Theories.

Commentaires: 8 pages, 2 figures, 5 tables. Due to a bug in the program, values of m_b(m_b) in Table 5 have been changed and are in excellent agreement with the ones from Q^2-moments (arXiv:1105.2922[hep-ph]) and exponential sum rules (arXiv:1105.5070[hep-ph]) within stability criteria. These changes will be published as an erratum in PLB Journal: Phys.Lett.B693:559-566,2010