@article{3190371,
    title = "Constraints on the chi(c1 )versus chi(c2) Polarizations in Proton-Proton
Collisions at root s=8 TeV",
    author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and and Bergauer, T. and Dragicevic, M. and Eroe, J. and Del Valle, A. Escalante and and Flechl, M. and Fruehwirth, R. and Jeitler, M. and Krammer, N. and and Kraetschmer, I and Liko, D. and Madlener, T. and Mikulec, I and Rad, N. and and Schieck, J. and Schoefbeck, R. and Spanring, M. and Waltenberger, W. and and Wulz, C-E and Zarucki, M. and Drugakov, V and Mossolov, V and and Gonzalez, J. Suarez and Darwish, M. R. and De Wolf, E. A. and Di Croce, and D. and Janssen, X. and Kello, T. and Lelek, A. and Pieters, M. and Sfar, and H. Rejeb and Van Haevermaet, H. and Van Mechelen, P. and Van Putte, S. and and Van Remortel, N. and Blekman, F. and Bols, E. S. and Chhibra, S. S. and and D'Hondt, J. and De Clercq, J. and Lontkovskyi, D. and Lowette, S. and and Marchesini, I and Moortgat, S. and Python, Q. and Tavernier, S. and and Van Doninck, W. and Van Mulders, P. and Beghin, D. and Bilin, B. and and Clerbaux, B. and De Lentdecker, G. and Delannoy, H. and Dorney, B. and and Favart, L. and Grebenyuk, A. and Kalsi, A. K. and Moureaux, L. and and Popov, A. and Postiau, N. and Starling, E. and Thomas, L. and Vander and Velde, C. and Vanlaer, P. and Vannerom, D. and Cornelis, T. and Dobur, and D. and Khvastunov, I and Niedziela, M. and Roskas, C. and Skovpen, K. and and Tytgat, M. and Verbeke, W. and Vermassen, B. and Vit, M. and Bruno, and G. and Caputo, C. and David, P. and Delaere, C. and Delcourt, M. and and Giammanco, A. and Lemaitre, V and Prisciandaro, J. and Saggio, A. and and Vischia, P. and Zobec, J. and Alves, G. 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E. and and Poudyal, N. and Sturdy, J. and Thapa, P. and Black, K. and Bose, T. and and Buchanan, J. and Caillol, C. and Carlsmith, D. and Dasu, S. and De and Bruyn, I and Dodd, L. and Galloni, C. and He, H. and Herndon, M. and and Herve, A. and Hussain, U. and Lanaro, A. and Loeliger, A. and Loveless, and R. and Sreekala, J. Madhusudanan and Mallampalli, A. and Pinna, D. and and Ruggles, T. and Savin, A. and Smith, W. H. and Teague, D. and and Trembath-reichert, S. and CMS Collaboration",
    journal = "Physical Review and Physical Review Letters Index",
    year = "2020",
    volume = "124",
    number = "16",
    publisher = "AMER PHYSICAL SOC",
    issn = "0094-0003",
    doi = "10.1103/PhysRevLett.124.162002",
    abstract = "The polarizations of promptly produced chi(c1) and chi(c2) mesons are
studied using data collected by the CMS experiment at the LHC, in
proton-proton collisions at root s = 8 TeV. The chi(c) states are
reconstructed via their radiative decays chi(c) -> J/psi gamma, with the
photons being measured through conversions to e(+)e(-), which allows the
two states to be well resolved. The polarizations are measured in the
helicity frame, through the analysis of the chi(c2) to chi(c1) yield
ratio as a function of the polar or azimuthal angle of the positive muon
emitted in the J/psi -> mu(+)mu(-) decay, in three bins of J/psi
transverse momentum. While no differences are seen between the two
states in terms of azimuthal decay angle distributions, they are
observed to have significantly different polar anisotropies. The
measurement favors a scenario where at least one of the two states is
strongly polarized along the hclicity quantization axis, in agreement
with nonrelativistic quantum chromodynamics predictions. This is the
first measurement of significantly polarized quarkonia produced at high
transverse momentum."
}