A multi-dimensional search for new heavy resonances decaying to boosted $$\text{ W }{}{}$$ $$\text{ W }{}{}$$ , $$\text{ W }{}{}$$ $$\text{ Z }{}{}$$ , or $$\text{ Z }{}{}$$ $$\text{ Z }{}{}$$ boson pairs in the dijet final state at 13 $$\text {Te}\text {V}$$
A. M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, T. Bergauer, J. Brandstetter, M. Dragicevic, J. Erö, A. Escalante Del Valle, M. Flechl, R. Frühwirth, M. Jeitler, Natascha Krammer, I. Krätschmer, D. Liko, T. Madlener, I. Mikulec, N. Rad, J. Schieck, R. Schöfbeck, M. Spanring, D. Spitzbart, W. Waltenberger, C.-E. Wulz, M. Zarucki, V. Drugakov, V. Mossolov, J. Suarez Gonzalez, M. R. Darwish, E. A. De Wolf, D. Di Croce, X. Janssen, J. Lauwers, A. Lelek, M. Pieters, Haifa Rejeb Sfar, H. Van Haevermaet, P. Van Mechelen, S. Van Putte, N. Van Remortel, F. Blekman, E. S. Bols, S. S. Chhibra, J. D’Hondt, J. De Clercq, D. Lontkovskyi, S. Lowette, I. Marchesini, S. Moortgat, L. Moreels, Q. Python, K. Skovpen, S. Tavernier, W. Van Doninck, P. Van Mulders, Isis Van Parijs, D. Beghin, B. Bilin, H. Brun, B. Clerbaux, G. De Lentdecker, H. Delannoy, B. Dorney, L. Favart, A. Grebenyuk, A. K. Kalsi, J. Luetic, A. Popov, N. Postiau, E. Starling, L. Thomas, C. Vander Velde, P. Vanlaer, D. Vannerom, T. Cornelis, D. Dobur, I. Khvastunov, M. Niedziela, C. Roskas, D. Trocino, M. Tytgat, W. Verbeke, B. Vermassen, M. Vit, N. Zaganidis, Olivier Bondu, G. Bruno, C. Caputo, P. David, C. Delaere, M. Delcourt, A. Giammanco, V. Lemaitre, A. Magitteri, J. Prisciandaro, A. Saggio, M. Vidal Marono, P. Vischia, J. Zobec, F. L. Alves
Abstract
Abstract A search in an all-jet final state for new massive resonances decaying to $$\text{ W }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>W</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> $$\text{ W }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>W</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> , $$\text{ W }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>W</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> $$\text{ Z }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>Z</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> , or $$\text{ Z }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>Z</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> $$\text{ Z }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>Z</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> boson pairs using a novel analysis method is presented. The analysis is performed on data corresponding to an integrated luminosity of 77.3 $$\,\text {fb}^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:msup><mml:mtext>fb</mml:mtext><mml:mrow><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math> recorded with the CMS experiment at the LHC at a centre-of-mass energy of 13 $$\text {Te}\text {V}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mtext>Te</mml:mtext><mml:mspace/></mml:mrow></mml:math> . The search is focussed on potential narrow-width resonances with masses above 1.2 $$\text {Te}\text {V}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mtext>Te</mml:mtext><mml:mspace/></mml:mrow></mml:math> , where the decay products of each $$\text{ W }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>W</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> or $$\text{ Z }{}{}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>Z</mml:mtext><mml:mspace/><mml:mrow/><mml:mrow/></mml:mrow></mml:math> boson are expected to be collimated into a single, large-radius jet. The signal is extracted using a three-dimensional maximum likelihood fit of the two jet masses and the dijet invariant mass, yielding an improvement in sensitivity of up to 30% relative to previous search methods. No excess is observed above the estimated standard model background. In a heavy vector triplet model, spin-1 $${\text {Z}}^{\prime }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mtext>Z</mml:mtext></mml:mrow><mml:mo>′</mml:mo></mml:msup></mml:math> and $${\text {W}}^{\prime }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mtext>W</mml:mtext></mml:mrow><mml:mo>′</mml:mo></mml:msup></mml:math> resonances with masses below 3.5 and 3.8 $$\text {Te}\text {V}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mtext>Te</mml:mtext><mml:mspace/></mml:mrow></mml:math> , respectively, are excluded at 95% confidence level. In a bulk graviton model, upper limits on cross sections are set between 27 and 0.2 $$\,\text {fb}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mspace/><mml:mtext>fb</mml:mtext></mml:mrow></mml:math> for resonance masses between 1.2 and 5.2 $$\text {Te}\text {V}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mtext>Te</mml:mtext><mml:mspace/></mml:mrow></mml:math> , respectively. The limits presented in this paper are the best to date in the dijet final state.