Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/20835
Title: Constraints on the χc1 versus χc2 Polarizations in Proton-Proton Collisions at √s=8  TeV
Authors: Sirunyan, AM
Tumasyan, A
Adam, W
Ambrogi, F
Bergauer, T
Dragicevic, M
Erö, J
Escalante Del Valle, A
Flechl, M
Frühwirth, R
Jeitler, M
Dominguez, A
Van Hove, P
Gadrat, S
Ogul, H
Beauceron, S
Santoro, A
Bernet, C
Boudoul, G
Lelek, A
Camen, C
Virdi, AK
Uniyal, R
Verbeke, W
Carle, A
Chanon, N
Chierici, R
Contardo, D
Onel, Y
Depasse, P
El Mamouni, H
Sosnov, D
Fay, J
Vargas Hernandez, AM
Gascon, S
Grandi, C
Gouzevitch, M
Pieters, M
Ille, B
Jain, S
Laktineh, IB
Ozok, F
Lattaud, H
Lesauvage, A
Buccilli, A
Lethuillier, M
Sulimov, V
Guiducci, L
Mirabito, L
Perries, S
Sordini, V
Torterotot, L
Rejeb Sfar, H
Touquet, G
Penzo, A
Cooper, SI
Vander Donckt, M
Viret, S
Toriashvili, T
Iemmi, F
Tsamalaidze, Z
Uvarov, L
Autermann, C
Feld, L
Klein, K
Lipinski, M
Agapitos, A
Meuser, D
Walczak, M
Van Haevermaet, H
Pauls, A
Kodolova, O
Preuten, M
Rauch, MP
Schulz, J
Vorobyev, A
Teroerde, M
Gleyzer, SV
Erdmann, M
Fischer, B
Ghosh, S
Snyder, C
Hebbeker, T
Lo Meo, S
Hoepfner, K
Van Mechelen, P
Keller, H
Mastrolorenzo, L
Mans, J
Merschmeyer, M
Lee, H
Andreev, Y
Meyer, A
Millet, P
Tiras, E
Marcellini, S
Mocellin, G
Mondal, S
Mukherjee, S
Morelos Pineda, A
Noll, D
Novak, A
Van Putte, S
Pook, T
Pozdnyakov, A
Dermenev, A
Quast, T
Masetti, G
Wetzel, J
Radziej, M
Henderson, C
Rath, Y
Reithler, H
Roemer, J
Schmidt, A
Schuler, SC
Sharma, A
Van Remortel, N
Wiedenbeck, S
Navarria, FL
Gninenko, S
Majumder, G
Kothekar, K
Yi, K
Zaleski, S
Flügge, G
Haj Ahmad, W
Hlushchenko, O
Kress, T
Müller, T
Nowack, A
Pistone, C
Mendis, DR
Rumerio, P
Pooth, O
Blekman, F
Roguljic, M
Golubev, N
Roy, D
Sert, H
Stahl, A
Aldaya Martin, M
Asmuss, P
Babounikau, I
West, C
Walia, G
Perrotta, A
Bakhshiansohi, H
Beernaert, K
Behnke, O
Blumenfeld, B
Bermúdez Martínez, A
Karneyeu, A
Bols, ES
Bin Anuar, AA
Albert, A
Borras, K
Botta, V
Primavera, F
Campbell, A
Cardini, A
Connor, P
Consuegra Rodríguez, S
Cocoros, A
Contreras-Campana, C
Danilov, V
Arcaro, D
Kirsanov, M
De Wit, A
Chhibra, SS
Rossi, AM
Defranchis, MM
Diez Pardos, C
Domínguez Damiani, D
Eckerlin, G
Eckstein, D
Eminizer, N
Demiragli, Z
Eichhorn, T
Elwood, A
Eren, E
Sznajder, A
Vermassen, B
Estevez Banos, LI
Gallo, E
D'Hondt, J
Geiser, A
Grohsjean, A
Gastler, D
Guthoff, M
Gritsan, AV
Haranko, M
Harb, A
Jafari, A
Rovelli, T
Jomhari, NZ
Krasnikov, N
Jung, H
Kasem, A
Richardson, C
Kasemann, M
De Clercq, J
Kaveh, H
Hung, WT
Keaveney, J
Kleinwort, C
Siroli, GP
Knolle, J
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Pashenkov, A
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Melzer-Pellmann, I-A
Revering, M
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Meyer, M
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Mussgiller, A
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Kyriacou, S
Tosi, N
Pérez Adán, D
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Lowette, S
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Saibel, A
Savitskyi, M
Lee, K
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Scheurer, V
Albergo, S
Minafra, N
Maksimovic, P
Schütze, P
Schwanenberger, C
Shevchenko, R
Singh, A
Sosa Ricardo, RE
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Abbiendi, G
Huang, T
Kamon, T
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Kim, H
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Wang, H
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Savina, M
Marley, D
Mueller, R
Battilana, C
Overton, D
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Rathjens, D
Mackay, CK
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Johns, W
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Maguire, C
Melo, A
Ni, H
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Skatchkov, N
Padeken, K
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Sheldon, P
Majumder, D
Zahid, S
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Braibant-Giacomelli, S
Velkovska, J
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Ang, L
Arenton, MW
Barria, P
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Smirnov, V
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Alhusseini, M
Campanini, R
Hakala, J
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Joyce, M
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Tannenwald, B
Wang, Y
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Wolfe, E
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Xia, F
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Kirschenmann, H
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Loveless, R
Castro, A
Madhusudanan Sreekala, J
Mallampalli, A
Pinna, D
Boos, E
Gandrajula, RP
Ruggles, T
Chtchipounov, L
Savin, A
Sharma, V
Smith, WH
Teague, D
Cavallo, FR
Trembath-Reichert, S
Brücken, E
Hatakeyama, K
CMS Collaboration
Garcia, F
Haytmyradov, M
Havukainen, J
Heikkilä, JK
Golovtcov, V
Karimäki, V
Kim, MS
Singh, JB
Ciocca, C
Rad, N
Kinnunen, R
Lampén, T
Lassila-Perini, K
Mossolov, V
Laurila, S
Khristenko, V
Lehti, S
Lindén, T
Siikonen, H
Ivanov, Y
Zhao, J
Codispoti, G
Tuominen, E
Tuominiemi, J
Luukka, P
Tuuva, T
Besancon, M
Couderc, F
Olszewski, M
Suarez Gonzalez, J
Dejardin, M
Madrid, C
Denegri, D
Klyukhin, V
Fabbro, B
Kim, V
Faure, JL
Ferri, F
Ganjour, S
Givernaud, A
Gras, P
Köseyan, OK
McMaster, B
Hamel de Monchenault, G
Jarry, P
Cuffiani, M
Darwish, MR
Leloup, C
Lenzi, B
Kim, JS
Kuznetsova, E
Locci, E
Malcles, J
Uribe Estrada, C
Rander, J
Merlo, J-P
Rosowsky, A
Dallavalle, GM
Sahin, MÖ
Savoy-Navarro, A
Titov, M
Yu, GB
De Wolf, EA
Ahuja, S
Lesko, Z
Levchenko, P
Amendola, C
Beaudette, F
Mestvirishvili, A
Fabbri, F
Bonanomi, M
Busson, P
Charlot, C
Diab, B
Falmagne, G
Pastika, N
Granier de Cassagnac, R
Kucher, I
Di Croce, D
Murzin, V
Lobanov, A
Fanfani, A
Mesic, B
Martin Perez, C
Nguyen, M
Ochando, C
Smith, C
Paganini, P
Rembser, J
Salerno, R
Sauvan, JB
Sirois, Y
Zabi, A
Fontanesi, E
Oreshkin, V
Moeller, A
Janssen, X
Bartek, R
Zghiche, A
Agram, J-L
Andrea, J
Bloch, D
Bourgatte, G
Brom, J-M
Chabert, EC
Maravin, Y
Collard, C
Conte, E
Dobur, D
Nachtman, J
Smirnov, I
Fontaine, J-C
Kello, T
Gelé, D
Goerlach, U
Grimault, C
Le Bihan, A-C
Giacomelli, P
Tonon, N
Keywords: Charm quark;Polarization;Hadron colliders
Issue Date: 24-Apr-2020
Publisher: American Physical Society
Citation: Phys Rev Lett, 2020, 124 (16), pp. 162002 - ?
Abstract: The polarizations of promptly produced χ_{c1} and χ_{c2} mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at sqrt[s]=8  TeV. The χ_{c} states are reconstructed via their radiative decays χ_{c}→J/ψγ, 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 χ_{c2} to χ_{c1} yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ→μ^{+}μ^{-} decay, in three bins of J/ψ 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 helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum.
URI: http://bura.brunel.ac.uk/handle/2438/20835
DOI: http://dx.doi.org/10.1103/PhysRevLett.124.162002
ISSN: 1079-7114
Other Identifiers: https://www.ncbi.nlm.nih.gov/pubmed/32383915
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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