How to find a Higgs boson with a mass between 155 and 180 GeV at the CERN LHC

M. Dittmar; H. Dreiner

doi:10.1103/PhysRevD.55.167

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How to find a Higgs boson with a mass between 155 and 180 GeV at the CERN LHC

M. Dittmar

H. Dreiner

Institute for Particle Physics (IPP), ETH Zürich, CH-8093 Zürich, Switzerland

Rutherford Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom

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Phys. Rev. D 55, 167 – Published 1 January, 1997

DOI: https://doi.org/10.1103/PhysRevD.55.167

Abstract

We reconsider the signature of events with two charged leptons and missing energy as a signal for the detection of the standard model Higgs boson in the mass region $M (Higgs)$ =155–180 GeV. It is shown that a few simple experimental criteria allow us to distinguish events originating from the Higgs boson decaying to $H \to W^{+} W^{-}$ from the nonresonant production of $W^{+} W^{-} X$ at the CERN LHC. With this set of cuts, signal to background ratios of about one to one are obtained, allowing a 5–10 $σ$ detection with about 5 ${fb}^{- 1}$ of luminosity. This corresponds to less than one year of running at the initial lower luminosity $L {= 10}^{33} {cm}^{- 2} s^{- 1}$ . This is significantly better than for the hitherto considered Higgs boson detection mode $H \to Z^{0} Z^{0 *} \to 2 l^{+} 2 l^{-}$ , where in this mass range about 100 ${fb}^{- 1}$ of integrated luminosity are required for a $5 σ$ signal.

References (20)

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CDF Collaboration, F. Abe et al., Phys. Rev. Lett. 74, 2626 (1995); D0 Collaboration, S. Abachi et al., 74, 2632 (1995).
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M. Spira (private communication).
The reaction $pp \to Wtb$ has been simulated using PYTHIA. As the cross section of this process is estimated neglecting top quark mass effects (T. Sjöstrand, private communication) we instead use the ratio to the $t \bar{t}$ cross section at $\sqrt{s}$ =16 TeV as estimated by R. J. N. Phillips, P. M. Zerwas, and J. Zunft, Proceedings of the ECFA Large Hadron Collider Workshop [4]; R. J. N. Phillips (private communication).
For the simulations we have used the structure functions CTEQ2 and the EHLQ as implemented within the PYTHIA 5.7 frame and the MRS(A) set as implemented within the PDFLIB. For details and further references see H. Plothow-Besch, Comput. Phys Commun. 75, 396 (1993); PDFLIB (version 6.06) W5051 CERN Computer library.

[c1] A. Blondel, talk given at the 28th ICHEP Conference, Warsaw (unpublished).

[c2] CDF Collaboration, F. Abe et al., Phys. Rev. Lett. 74, 2626 (1995); D0 Collaboration, S. Abachi et al., 74, 2632 (1995).

[c3] M. Carena et al., in Higgs Physics at LEP-II, Proceedings (CERN Report No. 96-01, Geneva, Switzerland, 1996), Report No. hep-ph/9602250 (unpublished).

[c4] D. Froidevaux, in Proceedings of the ECFA Large Hadron Collider Workshop, Aachen, Germany, 1990, edited by G. Jarlshog and D. Rein (CERN Report No. 90-10, Geneva, Switzerland, 1990), Vol. II.

[c5] CMS Collaboration, G. L. Bayatian et al., CERN Report No. CERN/LHCC 94-38, LHCC/P1, 1994 (unpublished).

[c6] ATLAS Collaboration, W. W. Armstrong et al., CERN Report No. CERN/LHCC 94-43, LHCC/P2, 1994 (unpublished).

[c7] Z. Kunszt and J. Stirling, Proceedings of the ECFA Large Hadron Collider Workshop [4].

[c8] S. Dawson, J. F. Gunion, H. E. Haber, and G. L. Kane, The Higgs Hunter’s Guide (Addison-Wesley, Reading, MA, 1990).

[c9] T. Rizzo, Phys. Rev. D22, 722 (1980); W.-Y. Keung and W. J. Marciano, 30, 248 (1984).

[c10] J. Fleischer and F. Jegerlehner, Phys. Rev. D23, 2001 (1981); B. A. Kniehl, Nucl. Phys.B357, 439 (1991).

[c11] J. F. Gunion, Z. Kunszt, and M. Soldate, Phys. Lett.163B, 389 (1985); 168B, 427(E) (1986); S. D. Ellis, J. Stirling, and R. Kleiss, Phys. Lett.163B, 261 (1985).

[c12] Particle Data Group, A. Barnett et al., Phys. Rev. D54, 1 (1996).

[c13] E. W. N. Glover, J. Ohnemus, and S. D. Willenbrock, Phys. Rev. D37, 3193 (1988).

[c14] V. Barger, G. Bhattacharya, T. Han, and B. A. Kniehl, Phys. Rev. D43, 779 (1991).

[c15] T. Sjöstrand, Comput. Phys. Commun.82, 74(1994).

[c16] C. A. Nelson, Phys. Rev. D37, 1220 (1988).

[c17] D. Graudenz, M. Spira, and P. Zerwas, Phys. Rev. Lett.70, 1372 (1993); S. Dawson, Nucl. Phys.B368, 283 (1991); A. Djouadi, M. Spira, and P. Zerwas, Phys. Lett. B264, 440 (1991).

[c18] M. Spira (private communication).

[c19] The reaction $pp \to Wtb$ has been simulated using PYTHIA. As the cross section of this process is estimated neglecting top quark mass effects (T. Sjöstrand, private communication) we instead use the ratio to the $t \bar{t}$ cross section at $\sqrt{s}$ =16 TeV as estimated by R. J. N. Phillips, P. M. Zerwas, and J. Zunft, Proceedings of the ECFA Large Hadron Collider Workshop [4]; R. J. N. Phillips (private communication).

[c20] For the simulations we have used the structure functions CTEQ2 and the EHLQ as implemented within the PYTHIA 5.7 frame and the MRS(A) set as implemented within the PDFLIB. For details and further references see H. Plothow-Besch, Comput. Phys Commun. 75, 396 (1993); PDFLIB (version 6.06) W5051 CERN Computer library.

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How to find a Higgs boson with a mass between 155 and 180 GeV at the CERN LHC

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