Higgs boson searches at the Tevatron

Abstract

This article reviews the Higgs searches at the Tevatron, as presented over the summer of 2012; both standard model (SM) and beyond the standard model (BSM) results are discussed as detailed (arXiv: 1207.0449; Phys. Rev. Lett., 2012, 109: 071804; Phys. Rev. D, 2012, 85: 032005).We discuss the combination of searches by the CDF and D0 Collaborations for the standard model Higgs boson in the mass range 100-200 GeV/c² produced in the the gg→H, WH, ZH, t\overline{t}H, and vector boson fusion production modes, and decaying in the H\to b\overline{b}, H→W ⁺ W^-, H→ZZ, H→τ⁺τ^-, and H→γγ modes. The data, collected at the Fermilab Tevatron collider inp\overline{p} collisions at \sqrt{s} = 1.96 TeV, correspond to integrated luminosities of up to 10 fb^-1. In the absence of signal, we expect to exclude the regions 100<m_H<120 GeV/c² and 139<m_H<184 GeV/c². We exclude, at the 95% C.L., two regions: 100<m_H<103 GeV/c², and 147<m_H<180 GeV/c². We observe a signi.cant excess of events in the mass range between 115 and 140 GeV/c². The local signi.cance corresponds to 3.0 standard deviations at m_H =120 GeV/c²; the global signi.cance (incorporating the lookelsewhere e.ect) for such an excess anywhere in the full mass range investigated is approximately 2.5 standard deviations. Furthermore, we separately combine searches for H\to b\overline{b}, H→W ⁺ W^-and H→γγ. We find that the excess is concentrated in the H→bbˉ channel, appearing in the searches over a broad range of m_H; the maximum local significance of 3.3 standard deviations corresponds to a global significance of approximately 3.1 standard deviations. The observed signal strengths in all channels are consistent with the expectation for a standard model Higgs boson at m_H = 125 GeV/c². The production of neutral Higgs bosons in association with b-quarks can be significantly enhanced in various beyond the standard model scenarios, including Supersymmetry. The recent combination of such searches from the two collaborations is discussed.

Keywords

Higgs / Tevatron

References

[1] T. Aaltonen, . [CDF and D0 Collaborations], arXiv: 1207.0449, 2012

[2] T. Aaltonen, . [CDF and D0 Collaborations], Phys. Rev. Lett., 2012, 109: 071804

[3] T. Aaltonen, . [CDF and D0 Collaborations], Phys. Rev. D, 2012, 85: 032005

[4] S. L. Glashow, Nucl. Phys., 1961, 22(4): 579

[5] S. Weinberg, Phys. Rev. Lett., 1967, 19(21): 1264

[6] A. Salam, Elementary Particle Theory, edited by N. Svartholm, Stockholm: Almqvist & Wiksell, 1968: 367

[7] F. Englert and R. Brout, Phys. Rev. Lett., 1964, 13(9): 321

[8] P. W. Higgs, Phys. Rev. Lett., 1964, 13(16): 508

[9] G. S. Guralnik, C. R. Hagen, and T. W. B. Kibble, Phys. Rev. Lett., 1964, 13(20): 585

[10] P. W. Higgs, Phys. Rev., 1966, 145(4): 1156

[11] T. Aaltonen, . [CDF and D0 Collaborations], arXiv: 1204.0042, 2012

[12] T. Aaltonen, . [CDF and D0 Collaborations], Phys. Rev. D, 2012, 86: 092003

[13] The ALEPH, CDF, D0, DELPHI, L3, OPAL, and SLD Collaborations, the LEP ElectroweakWorking Group, the Tevatron Electroweak Working Group, and the SLD Electroweak and Heavy Flavor Working Groups, arXiv: 1012.2367v2, 2011

[14] The ALEPH, DELPHI, L3 and OPAL Collaborations, and the LEP Working Group for Higgs Boson Searches, Phys. Lett. B, 2003, 565: 61

[15] G. Aad, . [ATLAS Collaboration], Phys. Lett. B, 2012, 716: 1

[16] S. Chatrchyan, . [CMS Collaboration], Phys. Lett. B, 2012, 716: 30

[17] G. Aad, . [ATLAS Collaboration], arXiv: 1207.0210, 2012; submitted to Phys. Lett. B.

[18] S. Chatrchyan, . [CMS Collaboration], Phys. Lett. B, 2012, 710: 284

[19] CDF and D0 use cylindrical coordinate systems with origins in the centers of the detectors, where θ and ϕ are the polar and azimuthal angles, respectively, and pseudora pidity is η= .ln tan(θ/2). The missing E_T (E⇀T) is defined by E⇀T = -ΣiETin^i, i = calorimeter tower number, where n^i is a unit vector perpendicular to the beam axis and pointing at the ith calorimeter tower. E⇀T is corrected for high-energy muons and also jet energy corrections.We define E⇀T = |E⇀T|.The transverse momentum pTis defined to be psin θ.

[20] T. Sjöstrand, S. Mrenna, and P. Skands, J. High Energy Phys., 2006, 05: 026. We use pythia version 6.216 to generate the Higgs boson signals.

[21] H. L. Lai, J. Huston, S. Kuhlmann, J. Morfin, F. Olness, J. F. Owens, J. Pumplin, and W. K. Tung, Eur. Phys. J. C, 2000, 12(3): 375

[22] J. Pumplin, , J. High Energy Phys., 2002, 07: 012

[23] C. Anastasiou, R. Boughezal, and F. Petriello, J. High Energy Phys., 2009, 04: 003

[24] D. de Florian and M. Grazzini, Phys. Lett. B, 2009, 674(4-5): 291

[25] J. Baglio and A. Djouadi, J. High Energy Phys., 2010, 10: 064

[26] O. Brein, R. V. Harlander, M. Weisemann, and T. Zirke, Eur. Phys. J. C, 2012, 72(2): 1868

[27] P. Bolzoni, F. Maltoni, S. O. Moch, and M. Zaro, Phys. Rev. Lett., 2010, 105(1): 011801

[28] M. Ciccolini, A. Denner, and S. Dittmaier, Phys. Rev. Lett., 2007, 99(16): 161803

[29] M. Ciccolini, A. Denner, and S. Dittmaier, Phys. Rev. D, 2008, 77(1): 013002

[30] A. D. Martin, W. J. Stirling, R. S. Thorne, and G. Watt, Eur. Phys. J. C, 2009, 63(2): 189

[31] S. Alekhin, . [PDF4LHC Working Group], arXiv: 1101.0536, 2011

[32] M. Botje, . [PDF4LHC Working Group], arXiv: 1101.0538, 2011

[33] C. Anastasiou, G. Dissertori, M. Grazzini, F. Stöckli, and B. R. Webber, J. High Energy Phys., 2009, 08: 099

[34] S. Dittmaier, . [LHC Higgs Cross Section Working Group], arXiv: 1201.3084, 2012

[35] A. Djouadi, J. Kalinowski, and M. Spira, Comput. Phys. Commun., 1998, 108(1): 56

[36] A. Bredenstein, A. Denner, S. Dittmaier, and M. M. Weber, Phys. Rev. D, 2006, 74(1): 013004

[37] A. Bredenstein, A. Denner, S. Dittmaier, A. Mück, and M. M. Weber, J. High Energy Phys., 2007, 02: 080

[38] G. Bozzi, S. Catani, D. de Florian, and M. Grazzini, Phys. Lett. B, 2003, 564(1-2): 65

[39] G. Bozzi, S. Catani, D. de Florian, and M. Grazzini, Nucl. Phys. B, 2006, 737(1-2): 73

[40] M. Mangano, M. Moretti, F. Piccinini, R. Pittau, and A. Polosa, J. High Energy Phys., 2003, 07: 001

[41] S. Frixione and B. R. Webber, J. High Energy Phys., 2002, 06: 029

[42] G. Corcella, I. G. Knowles, G. Marchesini, S. Moretti, K. Odagiri, P. Richardson, M. H. Seymour, and B. R. Webber, J. High Energy Phys., 2001, 01: 010

[43] A. Pukhov, E. Boos, M. Dubinin, V. Edneral, V. Ilyin, D. Kovalenko, A. Kryukov, V. Savrin, S. Shichanin, and A. Semenov, arXiv: hep-ph/9908288, 1999

[44] E. Boos, V. Bunichev, M. Dubinin, L. Dudko, V. Ilyin, A. Kryukov, V. Edneral, V. Savrin, A. Semenov, and A. Sherstnev, Nucl. Instrum. Methods Phys. Res.: Sect. A, 2004, 534: 250

[45] E. E. Boos, V. E. Bunichev, L. V. Dudko, V. I. Savrin, and A. V. Sherstnev, Phys. At. Nucl., 2006, 69(8): 1317

[46] J. M. Campbell and R. K. Ellis, Phys. Rev. D, 1999, 60(11): 113006

[47] U. Langenfeld, S. Moch, and P. Uwer, Phys. Rev. D, 2009, 80(5): 054009

[48] N. Kidonakis, Phys. Rev. D, 2006, 74(11): 114012

[49] R. Hamberg, W. L. van Neerven, and T. Matsuura, Nucl. Phys. B, 1991, 359(2-3): 343; Erratum, Nucl. Phys. B, 2002, 644: 403

[50] A heavy-.avor jet is a reconstructed cluster of calorimeter energies associated with particles produced in the hadronization and decay of a bottom or charm quark.

[51] A B-tagged jet is one identified to have originated from the decay of a heavy .avor quark.

[52] D. Acosta, . [CDF Collaboration], Phys. Rev. D, 2005, 71: 032001

[53] A. Abulencia, . [CDF Collaboration], J. Phys. G, 2007, 34: 2457

[54] V. M. Abazov, . [D0 Collaboration], Nucl. Instrum. Methods Phys. Res.: Sect. A, 2006, 565: 463

[55] M. Abolins, ., Nucl. Instrum. Methods Phys. Res.: Sect. A, 2008, 584: 75

[56] R. Angstadt, ., Nucl. Instrum. Methods Phys. Res.: Sect. A, 2010, 622: 298

[57] For a recent review, see: P. C. Bhat, Ann. Rev. Nucl. Part. Sci., 2011, 61(1): 281. The specific details of each analysis’s MVA are described in the respective references.

[58] V. M. Abazov, , Nucl. Instrum. Methods Phys. Res.: Sect. A, 2010, 620: 490

[59] J. Freeman, . Nucl. Instrum. Methods Phys. Res.: Sect. A, 2013, 697: 64

[60] D. Acosta, . [CDF Collaboration], Phys. Rev. D, 2005, 71: 052003

[61] A. Abulencia, . [CDF Collaboration], Phys. Rev. D, 2006, 74: 072006

[62] Statistics, in: K. Nakamura, . [Particle Data Group], J. Phys. G, 2010, 37: 075021.

[63] T. Aaltonen, . [CDF Collaboration], Phys. Rev. Lett., 2012, 109(11): 111802

[64] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2012, 109(12): 121802

[65] W. Fisher, FERMILAB-TM-2386-E, 2006

[66] T. Junk Nucl. Instrum. Methods Phys. Res.: Sect. A, 1999, 434: 435

[67] A. L. Read, J. Phys. G, 2002, 28(10): 2693

[68] I. W. Stewart and F. J. Tackmann, Phys. Rev. D, 2012, 85(3): 034011

[69] J. M. Campbell, R. K. Ellis, and C. Williams, Phys. Rev. D, 2010, 81(7): 074023

[70] L. Lyons, Annals of Applied Statistics, 2008, 2(3): 887

[71] O. J. Dunn, J. Am. Stat. Assoc., 1961, 56(293): 52

[72] A particular decay mode defined by an experimental signature as done here may be an admixture of several, though dominated by the one denoted.

[73] V. Barger, J. L. Hewett, and R. J. N. Phillips, Phys. Rev. D, 1990, 41(11): 3421

[74] H. P. Nilles, Phys. Rep., 1984, 110(1-2): 1

[75] H. E. Haber, and G. L. Kane, Phys. Rep., 1985, 117(2-4): 75

[76] The ALEPH Collaboration, The DELPHI Collaboration, The L3 Collaboration, and The OPAL Collaboration, Eur. Phys. J. C, 2006, 47: 547

[77] T. Affolder, . [CDF Collaboration], Phys. Rev. Lett., 2001, 86: 4472

[78] A. Abulencia, . [CDF Collaboration], Phys. Rev. Lett., 2006, 96: 011802

[79] T. Aaltonen, . [CDF Collaboration], Phys. Rev. D, 2012, 85: 032005

[80] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2005, 95(15): 151801

[81] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2006, 97(12): 121802

[82] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2008, 101(7): 071804

[83] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2008, 101(22): 221802

[84] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2009, 102(5): 051804

[85] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2010, 104(15): 151801

[86] V. M. Abazov, . [D0 Collaboration], Phys. Lett. B, 2011, 698: 97

[87] V. M. Abazov, . [D0 Collaboration], Phys. Rev. Lett., 2011, 107(12): 121801

[88] V. M. Abazov, . [D0 Collaboration], Phys. Lett. B, 2012, 707: 323

[89] V. M. Abazov, . [D0 Collaboration], Phys. Lett. B, 2012, 710: 569

[90] CMS Collaboration, Phys. Rev. Lett., 2011, 106: 231801

[91] ATLAS Collaboration, Phys. Lett. B, 2011, 705: 174

[92] CMS Collaboration, Phys. Lett. B, 2012, 713: 68

[93] S. Heinemeyer, W. Hollik, and G. Weiglein, Eur. Phys. J. C, 1999, 9: 343, FEYNHIGGS version 2.6.8 is used.

[94] S. Heinemeyer, W. Hollik, and G. Weiglein, Comput. Phys. Commun., 2000, 124(1): 76

[95] G. Degrassi, S. Heinemeyer, W. Hollik, P. Slavich, and G. Weiglein, Eur. Phys. J. C, 2003, 28(1): 133

[96] M. Frank, T. Hahn, S. Heinemeyer, W. Hollik, H. Rzehak, and G. Weiglein, J. High Energy Phys., 2007, 02: 047

[97] L. Hofer, U. Nierste, and D. Shere, J. High Energy Phys., 2009, 10: 081

[98] D. Noth and M. Spira, Phys. Rev. Lett., 2008, 101(18): 181801

[99] M_SUSY = 1 TeV, X_t = 2 TeV, M₂ = 0.2 TeV, |μ| = 0.2 TeV, and m_g = 0.8 TeV.

[100] M. Carena, S. Heinemeyer, C. E. M. Wagner, and G. Weiglein, Eur. Phys. J. C, 2006, 45(3): 797

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