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Physical Review D

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$C P$ -violating $H W W$ couplings at the Large Hadron Collider

Nishita Desai and Biswarup Mukhopadhyaya

Dilip Kumar Ghosh

Harish-Chandra Research Institute, Jhunsi, Allahabad-211019, India

Department of Theoretical Physics, Indian Association for Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Kolkata-700032, India

Phys. Rev. D 83, 113004 – Published 8 June, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.113004

Abstract

We investigate the possibility of probing an anomalous $C P$ -violating coupling in the $H W W$ vertex at the LHC. We consider the production of the Higgs boson in association with a $W$ and then decay via the $H \to W W$ channel taking into account the limits on the Higgs production cross section from the Tevatron. We select the same-sign dilepton final state arising from leptonic decays of two of the three $W$ s and apply cuts required to suppress the standard model background. Several kinematical distributions and asymmetries that can be used to ascertain the presence of a nonzero anomalous coupling are presented. We find that, for Higgs mass in the range 130–150 GeV and anomalous couplings allowed by the Tevatron data, these distributions can be studied with an integrated luminosity of $30 - 50 {fb}^{- 1}$ at the 14 TeV run. Attention is specifically drawn to some asymmetries that enable one to probe the real and imaginary parts (as well as their signs) of the anomalous coupling, in a complementary manner. We also explicitly demonstrate that showering and hadronization do not affect the utility of these variables, thus affirming the validity of parton-level calculations.

Article Text

References (33)

CDF Collaboration and D0 Collaboration, arXiv:1007.4587.
J. Baglio, A. Djouadi, S. Ferrag, and R. Godbole, Phys. Lett. B 699, 368 (2011).
G. Bayatian et al. (CMS Collaboration), J. Phys. G 34, 995 (2007).
G. Aad et al. (ATLAS Collaboration), arXiv:0901.0512.
B. Zhang, Y.-P. Kuang, H.-J. He, and C. Yuan, Phys. Rev. D 67, 114024 (2003).
S. S. Biswal, R. M. Godbole, R. K. Singh, and D. Choudhury, Phys. Rev. D 73, 035001 (2006).
R. M. Godbole, D. J. Miller, and M. Muhlleitner, J. High Energy Phys. 12 (2007) 031.
Y.-H. Qi, Y.-P. Kuang, B.-J. Liu, and B. Zhang, Phys. Rev. D 79, 055010 (2009).
Z. Zhang, G.-M. Chen, M. Yang, B.-J. Liu, J.-Q. Tao et al., Phys. Rev. D 78, 073010 (2008).
T. Han and Y. Li, Phys. Lett. B 683, 278 (2010).
N. D. Christensen, T. Han, and Y. Li, Phys. Lett. B 693, 28 (2010).
D. J. Miller, S. Choi, B. Eberle, M. Muhlleitner, and P. Zerwas, Phys. Lett. B 505, 149 (2001).
S. Choi, D. J. Miller, M. Muhlleitner, and P. Zerwas, Phys. Lett. B 553, 61 (2003).
S. D. Rindani and P. Sharma, Phys. Rev. D 79, 075007 (2009).
S. S. Biswal, D. Choudhury, R. M. Godbole, and Mamta, Phys. Rev. D 79, 035012 (2009).
S. S. Biswal and R. M. Godbole, Phys. Lett. B 680, 81 (2009).
Y. Takubo et al., arXiv:1011.5805.
D. Choudhury and Mamta, Phys. Rev. D 74, 115019 (2006).
T. Han, Y.-P. Kuang, and B. Zhang, Phys. Rev. D 73, 055010 (2006).
B. Sahin, J. Phys. G 36, 025012 (2009).
M. Acciarri et al. (L3 Collaboration), Phys. Lett. B 489, 102 (2000).
M. Dittmar and H. K. Dreiner, Phys. Rev. D 55, 167 (1997).
V. Hankele, G. Klamke, D. Zeppenfeld, and T. Figy, Phys. Rev. D 74, 095001 (2006).
T. Arens, U. Gieseler, and L. Sehgal, Phys. Lett. B 339, 127 (1994).
J. Vermaseren, arXiv:math-ph/0010025.
B. Mellado (private communication).
J. Pumplin et al., J. High Energy Phys. 07 (2002) 012.
CDF Collaboration, CDF Search for Higgs to $W W *$ Production using a Combined Matrix Element and Neural Network Technique, http://www-cdf.fnal.gov/physics/new/hdg//Results_files/results/hwwmenn_110304/.
Z. Sullivan and E. L. Berger, Phys. Rev. D 82, 014001 (2010).
T. Sjostrand, S. Mrenna, and P. Z. Skands, Comput. Phys. Commun. 178, 852 (2008).
T. Sjostrand, S. Mrenna, and P. Z. Skands, J. High Energy Phys. 05 (2006) 026.
J. Alwall et al., Comput. Phys. Commun. 176, 300 (2007).
M. Cacciari, G. P. Salam, and G. Soyez, J. High Energy Phys. 04 (2008) 063.