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Search for anomalous production of highly boosted Z bosons decaying to u+u- in proton-proton collisions at root s= 7 TeV

Abstract: Results are reported from a search for the anomalous production of highly boosted Z bosons with large transverse momentum and decaying to ?+??. Such Z bosons may be produced in the decays of new heavy particles. The search uses pp collision data at ?s = 7 TeV, corresponding to an integrated luminosity of 5.0 fb?1 recorded with the CMS detector. The shape of the observed transverse momentum distribution of Z bosons is consistent with standard model expectations. Constraints are obtained on models predicting the production of excited quarks decaying via electroweak processes. Assuming a compositeness scale that is equal to the excited quark mass as well as transition coupling strengths between Z bosons and excited quarks that are equal to standard model couplings to quarks, masses of excited quarks below 1.94 TeV are excluded at the 95% confidence level. For excited quark production via a novel contact interaction, masses below 2.22 TeV are excluded, even if the excited quarks do not couple to gluons.

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 Autoría: 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., Krätschmer I., 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

 Fuente: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2013, 722(1-3), 28-47

Editorial: Elsevier

 Fecha de publicación: 01/05/2013

Nº de páginas: 20

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2013.03.037

ISSN: 0370-2693,1873-2445

Url de la publicación: https://doi.org/10.1016/j.physletb.2013.03.037

Autores/as

CHATRCHYAN, SERGUEI

SHANHUEI CHUANG

MARTA FELCINI

ALBERTO GRAZIANO

CLARA JORDA LOPE

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO

MARIA DEL MAR SOBRON SAÑUDO