Charged Higgs boson search at the Fermilab Tevatron upgrade using τ polarization

Raychaudhuri, Sreerup; Roy, D. P.

doi:10.1103/physrevd.52.1556

Cited by 45 publications

(57 citation statements)

References 29 publications

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“…A detailed measurement of the decay pion energy distribution [60] or a simpler measurement of the inclusive single pion spectrum [61], can yield information on τ polarisation. Discussions exist in literature on how this can be utilized to sharpen search strategies for charged Higgs boson [60][61][62][63][64][65][66] or supersymmetric partners [67] and even for the measurement of SUSY parameters [68,69]. In a similar vein, one can also construct observables using the final state τ polarisation to probe ZZH couplings.…”

Section: Use Of Final State τ Polarization With Unpolarised Beamsmentioning

confidence: 99%

Role of polarization in probing anomalous gauge interactions of the Higgs boson

et al. 2009

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We explore the use of polarized e + /e − beams and/or the information on final state decay lepton polarizations in probing the interaction of the Higgs boson with a pair of vector bosons. A model independent analysis of the process e + e − → ffH, where f is any light fermion, is carried out through the construction of observables having identical properties under the discrete symmetry transformations as different individual anomalous interactions. This allows us to probe an individual anomalous term independent of the others. We find that initial state beam polarization can significantly improve the sensitivity to CP -odd couplings of the Z boson with the Higgs boson (ZZH). Moreover, an ability to isolate events with a particular τ helicity, with even 40% efficiency, can improve sensitivities to certain ZZH couplings by as much as a factor of 3. In addition, the contamination from the ZZH vertex contributions present in the measurement of the trilinear Higgs-W (W W H) couplings can be reduced to a great extent by employing polarised beams. The effects of initial state radiation (ISR) and beamstrahlung, which can be relevant for higher values of the beam energy are also included in the analysis.

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Section: Use Of Final State τ Polarization With Unpolarised Beamsmentioning

confidence: 99%

Role of polarization in probing anomalous gauge interactions of the Higgs boson

et al. 2009

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“…The discovery reach of the τ channel for H ± search at Tevatron and LHC can be significantly enhanced by exploiting the opposite polarization of τ coming from the H ± → τ ν(P τ = +1) and W ± → τ ν(P τ = −1) decays [17]. Let us briefly describe this simple but very powerful method.…”

Section: τ Polarization Effectmentioning

confidence: 99%

Looking for the Charged Higgs Boson

Roy

2004

Mod. Phys. Lett. A

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This review article starts with a brief introduction to the charged Higgs boson (H ± ) in the Minimal Supersymmetric Standard Model (MSSM). It then discusses the prospects of a relatively light H ± boson search via top quark decay at Tevatron/LHC, and finally a heavy H ± boson search at LHC. The viable channels for H ± search are identified in both the cases, with particular emphasis on the H ± → τ ν decay channel. The effects of NLO QCD correction in the SM as well as the MSSM are discussed briefly.

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“…Since we are treating the case of the light charged Higgs, there are essentially only two decay modes which are important: H + → τ + ν τ and H + → cs. The branching ratio of interest to us B(H + → τ + ν τ ) is given by [18,19]:…”

Section: Production Cross Sectionsmentioning

confidence: 99%

“…Polarisation of the τ ± influences the energy distributions in the subsequent decays of the τ ± . Strategies to enhance the H ± -induced effects in the decay t → b(W + , H + ) → b(τ + ν τ ), based on the polarisation of the τ + have been discussed at length, starting from the pioneering work [13][14][15][16] to the production and decays of a tt pair at the hadron colliders Tevatron and the LHC [17][18][19][20][21][22]. Also the effects of the (QED and QCD) radiative corrections on such distributions in the dominant (one-charged prong) decay channels τ + → π + ν τ , ρ + ν τ , a + 1 ν τ and +ν ν τ have been worked out [23].…”

Section: Introductionmentioning

confidence: 99%

Improved sensitivity to charged Higgs searches in top quark decays t→bH +→b(τ + ν τ ) at the LHC using τ polarisation and multivariate techniques

2011

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We present an analysis with improved sensitivity to the light charged Higgs (m H + < m t − m b ) searches in the top quark decays t → bH + → b(τ + ν τ ) + c.c. in the tt and single t/t production processes at the LHC. In the Minimal Supersymmetric Standard Model (MSSM), one anticipates the branching ratio B(H + → τ + ν τ ) 1 over almost the entire allowed tan β range. Noting that the τ + arising from the decay H + → τ + ν τ are predominantly rightpolarized, as opposed to the τ + from the dominant background W + → τ + ν τ , which are left-polarized, a number of H + /W + → τ + ν τ discriminators have been proposed and studied in the literature. We consider hadronic decays of the τ ± , concentrating on the dominant one-prong decay channel τ ± → ρ ± ν τ . The energy and p T of the charged prongs normalised to the corresponding quantities of the ρ ± are convenient variables which serve as τ ± polariser. We use the distributions in these variables and several other kinematic quantities to train a boosted decision tree (BDT). Using the BDT classifier, and a variant of it called BDTD, which makes use of decorrelated variables, we have calculated the BDT(D)-response functions to estimate the signal efficiency vs. the rejection of the background. We argue that this chain of analysis has a high sensitivity to light charged Higgs searches up to a mass of 150 GeV in the decays t → bH + (and charge conjugate) at the LHC. For the case of single top production, we also study the transverse mass of the system determined using Lagrange multipliers. a

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Charged Higgs boson search at the Fermilab Tevatron upgrade using τ polarization

Cited by 45 publications

References 29 publications

Role of polarization in probing anomalous gauge interactions of the Higgs boson

Role of polarization in probing anomalous gauge interactions of the Higgs boson

Looking for the Charged Higgs Boson

Improved sensitivity to charged Higgs searches in top quark decays t→bH +→b(τ + ν τ ) at the LHC using τ polarisation and multivariate techniques

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