Fermion polarization in sfermion decays as a probe of CP phases in the MSSM

Gajdosik, Thomas; Godbole, Rohini M.; Kraml, S.

doi:10.1088/1126-6708/2004/09/051

Cited by 34 publications

(32 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measurement of P t ′ , revealing phases or being consistent with vanishing phases, may also constrain |A b |. For a more detailed report of our investigations see [21].…”

Section: Discussionmentioning

confidence: 79%

“…[17], demonstrates that it may be possible to determine the real and imaginary parts of A t (A τ ) to a precision of 2-3% (10-20 % for low tan β and 3-7% at large tan β) from a fit of the MSSM Lagrange parameters to masses, cross sections and branching ratios at a future LC. In this project [21] we have explored the the longitudinal polarization of fermions produced in sfermion decays, i.e.f → fχ 0 andf → f ′χ± with f (f ) a third generation (s)quark or (s)lepton, as a probe of CP phases.…”

Section: Probing the Light Higgs Window Via Charged Higgs Decay At Lhmentioning

confidence: 99%

“…(2), depends only on couplings but not on masses. For the numerical analysis we therefore use M 1 , M 2 , µ, tan β, θf and ϕf as input parameters, assuming φ µ ≈ 0 to satisfy EDM constraints more easily: assuming cancellations for the 1-loop contributions and the CP-odd Higgs mass parameter m A > 300 GeV, 1-loop and 2-loop contributions to the electron EDM (eEDM), as well as their sum, stay below the experimental limit [24,21] In order not to vary too many parameters, we use, moreover, the GUT relation…”

Section: Probing the Light Higgs Window Via Charged Higgs Decay At Lhmentioning

confidence: 99%

“…The latter, however, are the only ones that can offer direct evidence of CP violation [16]. A recent summary of the progress in the area can be found in [20,21] and references therein. …”

mentioning

confidence: 99%

See 3 more Smart Citations

Working group report: High energy and collider physics

et al. 2004

Self Cite

View full text Add to dashboard Cite

This is a summary of the projects undertaken by the Working Group I on High Energy Collider Physics at the Eighth Workshop on High Energy Physics Phenomenology (WHEPP8) held at the Indian Institute of Technology, Mumbai, January 5-16, 2004. The topics covered are (i) Higgs searches (ii) supersymmetry searches (iii) extra dimensions and (iv) linear collider.The projects undertaken in the Working Group I on High Energy and Collider Physics can be classified into the categories (i) Higgs searches (ii) supersymmetry searches (iii) extra dimensions and (iv) linear collider. The reports on the projects are given below under these headings.1 Higgs searches Potential of Associated Higgs Production in LHC throughτ -pair modeParticipants: P.Agrawal and K.Mazumdar 1 At LHC, the Standard Model Higgs production in association with W-boson, pp → W H is very interesting, though in general the total production rate is dominated by gluon-gluon fusion process. There is a strong indication that the Higgs boson is not very heavy and the experimental search for Higgs mass, m H ≤ 150 GeV/c 2 is comparatively more difficult. In any case it is desirable to study all possibilities for detection of Higgs boson in this mass range to strengthen the significance of discovery via 'golden' modes. This has motivated us to probe less studied modes of Higgs boson decays via WH production. Once the Higgs boson is discovered at LHC these final states will have to be studied for confirmation anyway.The LHC experiments, both CMS and ATLAS, have special trigger algorithm at the first level (LEVEL 1) based on calorimetric information for selecting hadronic decays of τ in the final state [1]. The tau-decay modes of Supersymmetric Higgs bosons have been particularly studied for this purpose. The narrowness of a jet as in the case of hadronic tau decays has been utilised in discrimenating the transverse profile of jets. The tracker information is used at a later stage for decision at a higher level and hence leptonic decays of τ cannot be used for trigger. Of course the leptonic decays of W-boson (only electron and muon final states) can be chosen for trigger in inclusive isolated electron/muon mode. But the background is likely to be overwhelming in that case. Hence we try the possibility of triggering the signal with the taus from the Higgs decay. This situation can be effectively utilised for the decay mode H → τ + τ − in the Higgs boson mass range m H ≤ 140 GeV/c 2 where the branching ratio is not too small, though below 10%. According to the 'trigger menu' of CMS experiment there are two possibilities for events with at least one τ in the final state. For 95% efficiency of signal selection (SUSY Higgs decay to tau final state) the kinematic thresholds are as follows. 1.Inclusive τ -jet with jet transverse energy ≥ 86 GeV. 2. Double τ -jets with the transverse energy of each jet ≥ 59 GeV. It remains to be checked through simulation the efficiency in the signal channel after these requirements. We need to study the spectrum of transverse momen...

show abstract

“…The measurement of P t ′ , revealing phases or being consistent with vanishing phases, may also constrain |A b |. For a more detailed report of our investigations see [21].…”

Section: Discussionmentioning

confidence: 79%

Section: Probing the Light Higgs Window Via Charged Higgs Decay At Lhmentioning

confidence: 99%

Section: Probing the Light Higgs Window Via Charged Higgs Decay At Lhmentioning

confidence: 99%

“…The latter, however, are the only ones that can offer direct evidence of CP violation [16]. A recent summary of the progress in the area can be found in [20,21] and references therein. …”

mentioning

confidence: 99%

See 2 more Smart Citations

Working group report: High energy and collider physics

et al. 2004

Self Cite

View full text Add to dashboard Cite

show abstract

“…We use the narrow width approximation 30) for the propagators 31) which is justified for Γ j /m j ≪ 1, which holds in our case for particle widths Γ j < ∼ O(1 GeV), and masses m j ≈ O(100 GeV). Note, however, that the naive O(Γ/m)-expectation of the error can easily receive large off-shell corrections of an order of magnitude and more, in particular at threshold, or due to interferences with other resonant or non-resonant processes.…”

Section: Kinematics and Phase Spacementioning

confidence: 99%

CP violation in sbottom decays

Deppisch

Kittel

2010

J. High Energ. Phys.

View full text Add to dashboard Cite

We study CP asymmetries in two-body decays of bottom squarks into charginos and tops. These asymmetries probe the SUSY CP phases of the sbottom and the chargino sector in the Minimal Supersymmetric Standard Model. We identify the MSSM parameter space where the CP asymmetries are sizeable, and analyze the feasibility of their observation at the LHC. As a result, potentially detectable CP asymmetries in sbottom decays are found, which motivates further detailed experimental studies for probing the SUSY CP phases.

show abstract

Top polarisation studies in H − t and W t production

Godbole

Hartgring

Niessen³

et al. 2012

J. High Energ. Phys.

View full text Add to dashboard Cite

The polarisation of top quarks produced in high energy processes can be a very sensitive probe of physics beyond the Standard Model. The kinematical distributions of the decay products of the top quark can provide clean information on the polarisation of the produced top and thus can probe new physics effects in the top quark sector. We study some of the recently proposed polarisation observables involving the decay products of the top quark in the context of H − t and W t production. We show that the effect of the top polarisation on the decay lepton azimuthal angle distribution, studied recently for these processes at leading order in QCD, is robust with respect to the inclusion of next-to-leading order and parton shower corrections. We also consider the leptonic polar angle, as well as recently proposed energy-related distributions of the top decay products. We construct asymmetry parameters from these observables, which can be used to distinguish the new physics signal from the W t background and discriminate between different values of tan β and m H − in a general type II two-Higgs doublet model. Finally, we show that similar observables may be useful in separating a Standard Model W t signal from the much larger QCD induced top pair production background.

show abstract

Fermion polarization in sfermion decays as a probe of CP phases in the MSSM

Cited by 34 publications

References 59 publications

Working group report: High energy and collider physics

Working group report: High energy and collider physics

CP violation in sbottom decays

Top polarisation studies in H − t and W t production

Contact Info

Product

Resources

About