Supersymmetry spectroscopy in stop-chargino production at CERN LHC

Beccaria, Matteo; Macorini, Guido; Panizzi, Luca; Renard, F.M.; Verzegnassi, C.

doi:10.1103/physrevd.74.093009

Cited by 29 publications

(59 citation statements)

References 12 publications

(2 reference statements)

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“…This makes it increasingly difficult to satisfy Eq. (26). Since there is no separation cut imposed on the neutrino in t → bℓν, the ∆R cut is affecting the decay t → bjj more significantly.…”

Section: Att Productionmentioning

confidence: 99%

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Weak boson emission in hadron collider processes

Baur

2007

Phys. Rev. D

102

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The O(α) virtual weak radiative corrections to many hadron collider processes are known to become large and negative at high energies, due to the appearance of Sudakov-like logarithms. At the same order in perturbation theory, weak boson emission diagrams contribute. Since the W and Z bosons are massive, the O(α) virtual weak radiative corrections and the contributions from weak boson emission are separately finite. Thus, unlike in QED or QCD calculations, there is no technical reason for including gauge boson emission diagrams in calculations of electroweak radiative corrections. In most calculations of the O(α) electroweak radiative corrections, weak boson emission diagrams are therefore not taken into account. Another reason for not including these diagrams is that they lead to final states which differ from that of the original process. However, in experiment, one usually considers partially inclusive final states. Weak boson emission diagrams thus should be included in calculations of electroweak radiative corrections. In this paper, I examine the role of weak boson emission in those processes at the Fermilab Tevatron and the CERN LHC for which the one-loop electroweak radiative corrections are known to become large at high energies (inclusive jet, isolated photon, Z + 1 jet, Drell-Yan, di-boson,tt, and single top production). In general, I find that the cross section for weak boson emission is substantial at high energies and that weak boson emission and the O(α) virtual weak radiative corrections partially cancel. *

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Section: Att Productionmentioning

confidence: 99%

“…[26] as a function of the parton center of mass energy, √ŝ . For a top quark transverse momentum of p T (t) = 200 GeV (400 GeV), the average parton center of mass energy is √ŝ ≈ 1 TeV (1.7 TeV).…”

Section: B T-channel Single Top Productionmentioning

confidence: 99%

Weak boson emission in hadron collider processes

Baur

2007

Phys. Rev. D

102

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“…The first concerns g + b → W − + t which has been studied in either SM or MSSM, to one-loop leading logarithmic order [3]. For transverse W − , it of course obeys the HC rule (2) [1].…”

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confidence: 99%

Addendum to "Helicity conservation in gauge boson scattering at high energy"

Gounaris

Renard

2006

Phys. Rev. D

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In a previous paper we have established that for any two-body process involving even numbers of transverse vector bosons and gauginos, the dominant asymptotic amplitudes obey helicity conservation (HC); i.e. the sum of the helicities of the two incoming particles equals to the sum of the helicities of the two outgoing ones. This HC has been proved to all orders in MSSM, provided (s, |t|, |u|) are much larger than all masses in the model; but only to leading 1-loop logarithmic order in SM. In the present addendum, the validity of HC is extended to all two-body processes. Renormalizability is crucial for the HC validity, while all known anomalous couplings violate it.

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“…A priori, this possibility cannot be excluded. From a partial analysis performed for the dominant t-channel process in the MSSM it was found that for "asymptotic" accelerator energies large negative effects on the rate , of order ten percent (or more) were generated by the supposedly leading negative double Sudakov weak logarithms produced by a subset of weak one-loop diagrams [5]. A more complete one-loop calculation is however nowadays requested.…”

Section: Pos(2008lhc)062mentioning

confidence: 99%

“…An identical prejudice exists of a partial sizeable negative oneloop asymptotic Sudakov effect [5]. The complete one-loop calculation has been performed in the mSUGRA MSSM [8].…”

Section: Tw Production and S-channelmentioning

confidence: 99%