Search for a light charged Higgs boson in top quark decays in pp collisions at $ \sqrt {s} = 7\;TeV

• Published in: The journal of high energy physics Vol. 2012; no. 7
• Main Authors: Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Aguilo, E., Bergauer, T., Dragicevic, M., Erö, J., Fabjan, C., Friedl, M., Frühwirth, R., Ghete, V. M., Hammer, J., Hörmann, N., Hrubec, J., Jeitler, M., Kiesenhofer, W., Knünz, V., Krammer, M., Liko, D., Mikulec, I., Pernicka, M., Rahbaran, B., Rohringer, C., Rohringer, H., Schöfbeck, R., Strauss, J., Taurok, A., Waltenberger, W., Walzel, G., Widl, E., Wulz, C.-E., Mossolov, V., Shumeiko, N., Gonzalez, J. Suarez, Bansal, S., Cornelis, T., De Wolf, E. A., Janssen, X., Luyckx, S., Mucibello, L., Ochesanu, S., Roland, B., Rougny, R., Selvaggi, M., Staykova, Z., Van Haevermaet, H., Van Mechelen, P., Van Remortel, N., Van Spilbeeck, A., Blekman, F., Blyweert, S., D’Hondt, J., Suarez, R. Gonzalez, Kalogeropoulos, A., Maes, M., Olbrechts, A., Van Doninck, W., Van Mulders, P., Van Onsem, G. P., Villella, I., Clerbaux, B., De Lentdecker, G., Dero, V., Gay, A. P. R., Hreus, T., Léonard, A., Marage, P. E., Reis, T., Thomas, L., Velde, C. Vander, Vanlaer, P., Wang, J., Adler, V., Beernaert, K., Cimmino, A., Costantini, S., Garcia, G., Grunewald, M., Klein, B., Lellouch, J., Marinov, A., Mccartin, J., Rios, A. A. Ocampo, Ryckbosch, D., Strobbe, N., Thyssen, F., Tytgat, M., Verwilligen, P., Walsh, S., Yazgan, E., Zaganidis, N., Basegmez, S., Bruno, G., Castello, R., Ceard, L., Delaere, C., du Pree, T., Favart, D.
• Format: Journal Article
• Language: English
• Published: Springer 01-07-2012
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 1029-8479; 1126-6708; 1029-8479
• DOI: 10.1007/JHEP07(2012)143

A
bstract
Results are presented on a search for a light charged Higgs boson that can be produced in the decay of the top quark t → H
+
b and which, in turn, decays into
τ
+
ν
τ
. The analysed data correspond to an integrated luminosity of about 2 fb
−1
recorded in protonproton collisions at
$ \sqrt {s} = 7\;TeV $
by the CMS experiment at the LHC. The search is sensitive to the decays of the top quark pairs
$ {\text{t}}\overline {\text{t}} $
→ H
±
W
∓
$ {\text{b}}\overline {\text{b}} $
and
$ {\text{t}}\overline {\text{t}} $
→ H
±
H
∓
$ {\text{b}}\overline {\text{b}} $
. Various final states have been studied separately, all requiring presence of a
τ
lepton from H
+
decays, missing transverse energy, and multiple jets. Upper limits on the branching fraction
B
(t → H
+
b) in the range of 2-4 % are established for charged Higgs boson masses between 80 and 160 GeV, under the assumption that
B
(H
+
→
τ
+
ν
τ
) = 1.