Top-spin analysis of new scalar and tensor interactions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>collisions with beam polarization

Ananthanarayan, B.; Patra, Monalisa; Rindani, Saurabh D.

doi:10.1103/physrevd.83.016010

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…The discussion closely parallels the discussion that was recently provided for measuring the helicity of the top-quark in tt production given in Ref. [24]. So far we have assumed that it would be possible to isolate a sample of events where the Z has a definite helicity, which in practice is not possible as one can only measure polarization at a statistical level.…”

Section: Utilizing Final-state Z and γ Helicitiesmentioning

confidence: 64%

“…Eq. (24). Because of this boost factor we get limit on Reλ 2 which is well under the ambit of linear approximation and thus we will retain it for further consideration in A ′γ − (θ 0 ).…”

Section: B Numerical Analysismentioning

confidence: 99%

“…Recently, it was shown, in the context of tt production with beyond the SM interactions parametrized in terms of effective four-Fermi interactions, that the measurement of final-state helicity can help in disentangling the contributions of scalar and tensor like four-Fermi interactions when the beams are transversely polarized [24].…”

Section: Introductionmentioning

confidence: 99%

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IsolatingCP-violatingγZZcoupling ine+e−
Ananthanarayan
¹
,
Garg
²
,
Patra
³

et al. 2012
Phys. Rev. D
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We revisit the process e + e − → γZ at the ILC with transverse beam polarization in the presence of anomalous CP-violating γZZ coupling λ1 and γγZ coupling λ2. We point out that if the finalstate spins are resolved, then it becomes possible to fingerprint the anomalous coupling Reλ1. 90% confidence level limit on Reλ1 achievable at ILC with center-of-mass energy of 500 GeV or 800 GeV with realistic initial beam polarization and integrated luminosity is of the order of few times of 10 −2 when the helicity of Z is used and 10 −3 when the helicity of γ is used. The resulting corrections at quadratic order to the cross section and its influence on these limits are also evaluated and are shown to be small. The benefits of such polarization programmes at the ILC are compared and contrasted for the process at hand. We also discuss possible methods by which one can isolate events with a definite helicity for one of the final-state particles.

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Section: Utilizing Final-state Z and γ Helicitiesmentioning

confidence: 64%

Section: B Numerical Analysismentioning

confidence: 99%

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IsolatingCP-violatingγZZcoupling ine+e−
Ananthanarayan
¹
,
Garg
²
,
Patra
³

et al. 2012
Phys. Rev. D
Self Cite
20
0
42
0
View full text Add to dashboard Cite

show abstract

Generalized top-spin analysis and new physics ine+e−collisions with beam polarization

et al. 2012

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A generalized top-spin analysis proposed some time ago in the context of Standard Model and subsequently studied in varying contexts is now applied primarily to the case of e + e − → tt with transversely polarized beams. This extends our recent work with new physics couplings of scalar (S) and tensor (T ) types. We carry out a comprehensive analysis assuming only the electron beam to be transversely polarized, which is sufficient to probe these interactions, and also eliminates any azimuthal angular dependence due to standard model or new physics of vector (V ) and axial-vector (A) type interactions. We then consider new physics of general four-Fermi type of V and A type with both beams transversely polarized and discuss implications with longitudinal polarization as well. The generalized spin bases are all investigated in the presence of either longitudinal or transverse beam polarization to look for appreciable deviation from the SM prediction in case of the new physics. 90% confidence level limits are obtained on the interactions for the generalized spin bases with realistic integrated luminosity. In order to achieve this we present a general discussion based on helicity amplitudes and derive a general transformation matrix that enables us to treat the spin basis. We find that beamline basis combined with transverse polarization provides an excellent window of opportunity both for S, T and V , A new physics, followed by the off diagonal basis. The helicity basis is shown to be the best in case of longitudinal polarization to look for new physics effects due to V and A.

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Inclusive spin–momentum analysis and new physics at a polarized electron–positron collider

Ananthanarayan

Rindani

2018

Eur. Phys. J. C

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We consider the momentum distribution and the polarization of an inclusive heavy fermion in a process assumed to arise from standard-model (SM) s-channel exchange of a virtual γ or Z with a further contribution from physics beyond the standard model involving s-channel exchanges. The interference of the new physics amplitude with the SM γ or Z exchange amplitude is expressed entirely in terms of the space-time signature of such new physics. Transverse as well as longitudinal polarizations of the electron and positron beams are taken into account. Similarly, we consider the cases of the polarization of the observed final-state fermion along longitudinal and two transverse spin-quantization axes which are required for a full reconstruction of the spin dependence of the process. We show how these model-independent distributions can be used to deduce some general properties of the nature of the interaction and some of their properties in prior work which made use of spin-momentum correlations.

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Top-spin analysis of new scalar and tensor interactions ine+e−collisions with beam polarization

Cited by 3 publications

References 23 publications

IsolatingCP-violatingγZZcoupling ine+e−
Ananthanarayan
¹
,
Garg
²
,
Patra
³

et al. 2012
Phys. Rev. D
Self Cite
20
0
42
0
View full text Add to dashboard Cite

IsolatingCP-violatingγZZcoupling ine+e−
Ananthanarayan
¹
,
Garg
²
,
Patra
³

et al. 2012
Phys. Rev. D
Self Cite
20
0
42
0
View full text Add to dashboard Cite

Generalized top-spin analysis and new physics ine+e−collisions with beam polarization

Inclusive spin–momentum analysis and new physics at a polarized electron–positron collider

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Top-spin analysis of new scalar and tensor interactions ine+e−collisions with beam polarization

Cited by 3 publications

References 23 publications

IsolatingCP-violatingγZZcoupling ine+e−Ananthanarayan1, Garg2, Patra3 et al. 2012Phys. Rev. DSelf Cite200420View full textAdd to dashboardCite

IsolatingCP-violatingγZZcoupling ine+e−Ananthanarayan1, Garg2, Patra3 et al. 2012Phys. Rev. DSelf Cite200420View full textAdd to dashboardCite

Generalized top-spin analysis and new physics ine+e−collisions with beam polarization

Inclusive spin–momentum analysis and new physics at a polarized electron–positron collider

Contact Info

Product

Resources

About

IsolatingCP-violatingγZZcoupling ine+e−
Ananthanarayan
¹
,
Garg
²
,
Patra
³

et al. 2012
Phys. Rev. D
Self Cite
20
0
42
0
View full text Add to dashboard Cite

IsolatingCP-violatingγZZcoupling ine+e−
Ananthanarayan
¹
,
Garg
²
,
Patra
³

et al. 2012
Phys. Rev. D
Self Cite
20
0
42
0
View full text Add to dashboard Cite