1. Measurement of prompt-production cross-section ratio $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ in $p$Pb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV
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Aaij, R., Beteta, C. Abellán, Albrecht, J., Bradley, M. J., Braun, S., Rodriguez, A. Brea, Brodski, M., Brodzicka, J., Gonzalo, A. Brossa, Brundu, D., Buonaura, A., Burr, C., Bursche, A., Alessio, F., Butkevich, A., Butter, J. S., Buytaert, J., Byczynski, W., Cadeddu, S., Cai, H., Calabrese, R., Calefice, L., Diaz, L. Calero, Cali, S., Alexander, M., Calladine, R., Calvi, M., Gomez, M. Calvo, Magalhaes, P. Camargo, Camboni, A., Campana, P., Quezada, A. F. Campoverde, Capelli, S., Capriotti, L., Carbone, A., Albero, A. Alfonso, Carboni, G., Cardinale, R., Cardini, A., Carli, I., Carniti, P., Carus, L., Akiba, K. Carvalho, Vidal, A. Casais, Casse, G., Cattaneo, M., Aliouche, Z., Cavallero, G., Celani, S., Cerasoli, J., Chadwick, A. J., Chapman, M. G., Charles, M., Charpentier, Ph., Charpentier, Philippe, Chatzikonstantinidis, G., Barajas, C. A. Chavez, Alkhazov, G., Chefdeville, M., Chen, C., Chen, S., Chernov, A., Chobanova, V., Cholak, S., Chrzaszcz, M., Chubykin, A., Chulikov, V., Ciambrone, P., Cartelle, P. Alvarez, Cicala, M. F., Vidal, X. Cid, Ciezarek, G., Clarke, P. E. L., Clemencic, M., Cliff, H. V., Closier, J., Cobbledick, J. L., Coco, V., Coelho, J. A. B., Amato, S., Cogan, J., Cogneras, E., Cojocariu, L., Collins, P., Colombo, T., Congedo, L., Contu, A., Cooke, N., Coombs, G., Corti, G., Amhis, Y., Sobral, C. M. Costa, Couturier, B., Craik, D. C., Crkovská, J., Torres, M. Cruz, Currie, R., Da Silva, C. L., Dall'Occo, E., Dalseno, J., D'Ambrosio, C., An, L., Danilina, A., d'Argent, P., Davis, A., Francisco, O. De Aguiar, De Bruyn, K., De Capua, S., De Cian, M., De Miranda, J. M., De Paula, L., De Serio, M., Ackernley, T., Anderlini, L., De Simone, D., De Simone, P., de Vries, J. A., Dean, C. T., Decamp, D., Del Buono, L., Delaney, B., Dembinski, H.-P., Dendek, A., Denysenko, V., Andreianov, A., Derkach, D., Deschamps, O., Desse, F., Dettori, F., Dey, B., Di Nezza, P., Didenko, S., Maronas, L. Dieste, Dijkstra, H., Dobishuk, V., Andreotti, M., Donohoe, A. M., Dordei, F., Reis, A. C. dos, Douglas, L., Dovbnya, A., Downes, A. G., Dreimanis, K., Dudek, M. W., Dufour, L., Duk, V., Archilli, F., Durante, P., Durham, J. M., Dutta, D., Dziewiecki, M., Dziurda, A., Dzyuba, A., Easo, S., Egede, U., Egorychev, V., Eidelman, S., Artamonov, A., Eisenhardt, S., Ek-In, S., Eklund, L., Ely, S., Ene, A., Epple, E., Escher, S., Eschle, J., Esen, S., Evans, T., Artuso, M., Falabella, A., Fan, J., Fan, Y., Fang, B., Farry, S., Fazzini, D., Fedin, P., Féo, M., Declara, P. Fernandez, Prieto, A. Fernandez, Arzymatov, K., Arribas, J. M. Fernandez-tenllado, Ferrari, F., Lopes, L. Ferreira, Rodrigues, F. Ferreira, Sole, S. Ferreres, Ferrillo, M., Ferro-Luzzi, M., Filippov, S., Fini, R. A., Fiorini, M., Aslanides, E., Firlej, M., Fischer, Kamil Leszek, Fischer, K. M., Fitzpatrick, C., Fiutowski, T., Fleuret, F., Fontana, M., Fontanelli, F., Forty, R., Lima, V. Franco, Atzeni, M., Sevilla, M. Franco, Frank, M., Franzoso, E., Frau, G., Frei, C., Friday, D. A., Fu, J., Fuehring, Q., Funk, W., Gabriel, E., Audurier, B., Gaintseva, T., Torreira, A. Gallas, Galli, D., Gambetta, S., Gan, Y., Gandelman, M., Gandini, P., Gao, Y., Garau, M., Martin, L. M. Garcia, Adeva, B., Bachmann, S., Moreno, P. Garcia, Pardiñas, J. García, Plana, B. Garcia, Rosales, F. A. Garcia, Garrido, L., Gaspar, C., Geertsema, R. E., Gerick, D., Gerken, L. L., Gersabeck, E., Bachmayer, M., Gersabeck, M., Gershon, T., Gerstel, D., Ghez, Philippe, Ghez, Ph., Gibson, V., Giemza, H. K., Giovannetti, M., Gioventù, A., Gironell, P. Gironella, Back, J. J., Giubega, L., Giugliano, C., Gizdov, K., Gkougkousis, E. L., Gligorov, V. V., Göbel, C., Golobardes, E., Golubkov, D., Golutvin, A., Gomes, A., Baker, S., Fernandez, S. Gomez, Abrantes, F. Goncalves, Goncerz, M., Gong, G., Gorbounov, P., Gorelov, I. V., Gotti, C., Govorkova, E., Grabowski, J. P., Diaz, R. Graciani, Rodriguez, P. Baladron, Grammatico, T., Cardoso, L. A. Granado, Graugés, E., Graverini, E., Graziani, G., Grecu, A., Greeven, L. M., Griffith, P., Grillo, L., Gromov, S., Balagura, V., Cazon, B. R. Gruberg, Gu, C., Guarise, M., Günther, P. A., Gushchin, E., Guth, A., Guz, Y., Gys, T., Hadavizadeh, T., Haefeli, G., Baldini, W., Haen, C., Haimberger, J., Halewood-leagas, T., Hamilton, P. M., Han, Q., Han, X., Hancock, T. H., Hansmann-Menzemer, S., Harnew, N., Harrison, T., Leite, J. Baptista, Hasse, C., Hatch, M., He, J., Hecker, M., Heijhoff, K., Heinicke, K., Hennequin, A. M., Hennessy, K., Henry, L., Heuel, J., Barlow, R. J., Hicheur, A., Hill, D., Hilton, M., Hollitt, S. E., Hu, Jiangqiao, Hu, Jifeng, Hu, W., Huang, W., Huang, X., Hulsbergen, W., Barsuk, S., Hunter, R. J., Hushchyn, M., Hutchcroft, D., Hynds, D., Ibis, P., Idzik, M., Ilin, D., Ilten, P., Inglessi, A., Ishteev, A., Adinolfi, M., Barter, W., Ivshin, K., Jacobsson, R., Jakobsen, S., Jans, E., Jashal, B. K., Jawahery, A., Jevtic, V., Jezabek, M., Jiang, F., John, M., Bartolini, M., Johnson, D., Jones, C. R., Jones, T. P., Jost, B., Jurik, N., Kandybei, S., Kang, Y., Karacson, M., Karpov, M., Kazeev, N., Baryshnikov, F., Keizer, F., Kenzie, M., Ketel, T., Khanji, B., Kharisova, A., Kholodenko, S., Kim, K. E., Kirn, T., Kirsebom, V. S., Kitouni, O., Basels, J. M., Klaver, S., Klimaszewski, K., Koliiev, S., Kondybayeva, A., Konoplyannikov, A., Kopciewicz, P., Kopecna, R., Koppenburg, P., Korolev, M., Kostiuk, I., Bassi, G., Kot, O., Kotriakhova, S., Kravchenko, P., Kravchuk, L., Krawczyk, R. D., Kreps, M., Kress, F., Kretzschmar, S., Krokovny, P., Krupa, W., Batsukh, B., Krzemien, W., Kucewicz, W., Kucharczyk, M., Kudryavtsev, V., Kuindersma, H. S., Kunde, G. J., Kvaratskheliya, T., Lacarrere, D., Lafferty, G., Lai, A., Battig, A., Lampis, A., Lancierini, D., Lane, J. J., Lane, R., Lanfranchi, G., Langenbruch, C., Langer, J., Lantwin, O., Latham, T., Lazzari, F., Bay, A., Gac, R. Le, Lee, S. H., Lefèvre, R., Leflat, A., Legotin, S., Leroy, O., Lesiak, T., Leverington, B., Li, H., Li, L., Becker, M., Li, P., Li, Yiming, Li, Yutong, Li, Z., Liang, X., Lin, T., Lindner, R., Lisovskyi, V., Litvinov, R., Liu, G., Bedeschi, F., Liu, H., Liu, S., Liu, X., Loi, A., Castro, J. Lomba, Longstaff, I., Lopes, J. H., Lovell, G. H., Lu, Y., Lucchesi, D., Afsharnia, H., Bediaga, I., Luchuk, S., Martinez, M. Lucio, Lukashenko, V., Luo, Y., Lupato, A., Luppi, E., Lupton, O., Lusiani, A., Lyu, X., Ma, L., Beiter, A., Ma, R., Maccolini, S., Machefert, F., Maciuc, F., Macko, V., Mackowiak, P., Maddrell-Mander, S., Madejczyk, O., Mohan, L. R. Madhan, Maev, O., Belavin, V., Maevskiy, A., Maisuzenko, D., Majewski, M. W., Malczewski, J. J., Malde, S., Malecki, B., Malinin, A., Maltsev, T., Malygina, H., Manca, G., Belin, S., Mancinelli, G., Escalero, R. Manera, Manuzzi, D., Marangotto, D., Maratas, J., Marchand, J. F., Marconi, U., Mariani, S., Benito, C. Marin, Marinangeli, M., Bellee, V., Marino, P., Marks, J., Marshall, P. J., Martellotti, G., Martinazzoli, L., Martinelli, M., Santos, D. Martinez, Vidal, F. Martinez, Massafferri, A., Materok, M., Belous, K., Matev, R., Mathad, A., Mathe, Z., Matiunin, V., Matteuzzi, C., Mattioli, K. R., Mauri, A., Maurice, E., Mauricio, J., Mazurek, M., Belov, I., McCann, M., Mcconnell, L., Mcgrath, T. H., McNab, A., McNulty, R., Mead, J. V., Meadows, B., Meaux, C., Meier, G., Meinert, N., Belyaev, I., Melnychuk, D., Meloni, S., Merk, M., Merli, A., Garcia, L. Meyer, Mikhasenko, M., Milanes, D. A., Millard, E., Milovanovic, M., Minard, M.-N., Bencivenni, G., Minzoni, L., Mitchell, S. E., Mitreska, B., Mitzel, D. S., Mödden, A., Mohammed, R. A., Moise, R. D., Mombächer, T., Monroy, I. A., Monteil, S., Ben-Haim, E., Morandin, M., Morello, G., Morello, M. J., Moron, J., Morris, A. B., Morris, A. G., Mountain, R., Mu, H., Muheim, F., Mukherjee, M., Aidala, C. A., Berezhnoy, A., Mulder, M., Müller, D., Müller, K., Murphy, C. H., Murray, D., Muzzetto, P., Naik, P., Nakada, T., Nandakumar, R., Nanut, T., Bernet, R., Nasteva, I., Needham, M., Neri, I., Neri, N., Neubert, S., Neufeld, N., Newcombe, R., Nguyen, T. D., Nguyen-Mau, C., Niel, E. M., Berninghoff, D., Nieswand, S., Nikitin, N., Nolte, N. S., Nunez, C., Oblakowska-Mucha, A., Obraztsov, V., O'Hanlon, D. P., Oldeman, R., Olivares, M. E., Onderwater, C. J. G., Bernstein, H. C., Ossowska, A., Goicochea, J. M. Otalora, Ovsiannikova, T., Owen, P., Oyanguren, A., Pagare, B., Pais, P. R., Pajero, T., Palano, A., Palutan, M., Bertella, C., Pan, Y., Panshin, G., Papanestis, A., Pappagallo, M., Pappalardo, L. L., Pappenheimer, C., Parker, W., Parkes, C., Parkinson, C. J., Passalacqua, B., Bertolin, A., Passaleva, G., Pastore, A., Patel, M., Patrignani, C., Pawley, C. J., Pearce, A., Pellegrino, Antonio, Altarelli, M. Pepe, Perazzini, S., Pereima, D., Betancourt, C., Perret, P., Petridis, K., Petrolini, A., Petrov, A., Petrucci, S., Petruzzo, M., Pham, T. T. H., Philippov, A., Pica, L., Piccini, M., Betti, F., Pietrzyk, B., Pietrzyk, G., Pili, M., Pinci, D., Pisani, F., Piucci, A., K, Resmi P., Placinta, V., Plews, J., Casasus, M. Plo, Bezshyiko, Ia., Polci, F., Lener, M. Poli, Poliakova, M., Poluektov, A., Polukhina, N., Polyakov, I., Polycarpo, E., Pomery, G. J., Ponce, S., Popov, D., Bezshyiko, Iaroslava, Popov, S., Poslavskii, S., Prasanth, K., Promberger, L., Prouve, C., Pugatch, V., Pullen, H., Punzi, G., Qian, W., Qin, J., Aiola, S., Bhasin, S., Quagliani, R., Quintana, B., Raab, N. V., Trejo, R. I. Rabadan, Rachwal, B., Rademacker, J. H., Rama, M., Pernas, M. Ramos, Rangel, M. S., Ratnikov, F., Bhom, J., Raven, G., Reboud, M., Redi, F., Reiss, F., Alepuz, C. Remon, Ren, Z., Renaudin, V., Ribatti, R., Ricciardi, S., Rinnert, K., Bian, L., Robbe, P., Robert, A., Robertson, G., Rodrigues, A. B., Rodrigues, E., Lopez, J. A. Rodriguez, Rollings, A., Roloff, P., Romanovskiy, V., Lamas, M. Romero, Bieker, M. S., Vidal, A. Romero, Roth, J. D., Rotondo, M., Rudolph, M. S., Ruf, T., Vidal, J. Ruiz, Ryzhikov, A., Ryzka, J., Silva, J. J. Saborido, Sagidova, N., Bifani, S., Sahoo, N., Saitta, B., Gonzalo, D. Sanchez, Gras, C. Sanchez, Santacesaria, R., Rios, C. Santamarina, Santimaria, M., Santovetti, E., Saranin, D., Sarpis, G., Billoir, P., Sarpis, M., Sarti, A., Satriano, C., Satta, A., Saur, M., Savrina, D., Sazak, H., Smead, L. G. Scantlebury, Schael, S., Schellenberg, M., Birch, M., Schiller, M., Schindler, H., Schmelling, M., Schmidt, B., Schneider, O., Schopper, A., Schubiger, M., Schulte, S., Schune, M. H., Schwemmer, R., Bishop, F. C. R., Sciascia, B., Sciubba, A., Sellam, S., Semennikov, A., Senghi Soares, Mara, Sergi, A., Serra, N., Sestini, L., Seuthe, A., Seyfert, P., Bitadze, A., Shangase, D. M., Shapkin, M., Shchemerov, I., Shchutska, L., Shears, T., Shekhtman, L., Shen, Z., Shevchenko, V., Shields, E. B., Shmanin, E., Bizzeti, A., Shupperd, J. D., Siddi, B. G., Coutinho, R. Silva, Simi, G., Simone, S., Skidmore, N., Skwarnicki, T., Slater, M. W., Slazyk, I., Smallwood, J. C., Ajaltouni, Z., Bjørn, M., Smeaton, J. G., Smetkina, A., Smith, E., Smith, M., Snoch, A., Soares, Marcelo, Lavra, L. Soares, Sokoloff, M. D., Soler, F. J. P., Solovev, A., Blago, M. P., Solovyev, I., De Almeida, F. L. Souza, De Paula, B. Souza, Spaan, B., Norella, E. Spadaro, Spradlin, P., Stagni, F., Stahl, M., Stahl, S., Stefko, P., Blake, T., Steinkamp, O., Stemmle, S., Stenyakin, O., Stevens, H., Stone, S., Stramaglia, M. E., Straticiuc, M., Strekalina, D., Suljik, F., Sun, J., Blanc, F., Sun, L., Sun, Y., Svihra, P., Swallow, P. N., Swientek, K., Szabelski, A., Szumlak, T., Szymanski, M., Taneja, S., Teubert, F., Blusk, S., Thomas, E., Thomson, K. A., Tilley, M. J., Tisserand, V., T'Jampens, S., Tobin, M., Tolk, S., Tomassetti, L., Machado, D. Torres, Tou, D. Y., Bobulska, D., Traill, M., Tran, M. T., Trifonova, E., Trippl, C., Tuci, G., Tully, A., Tuning, N., Ukleja, A., Unverzagt, D. J., Ursov, E., Boelhauve, J. A., Usachov, A., Ustyuzhanin, A., Uwer, U., Vagner, A., Vagnoni, V., Valassi, A., Valenti, G., Canudas, N. Valls, van Beuzekom, M., Van Dijk, M., Garcia, O. Boente, van Herwijnen, E., Van Hulse, C. B., van Veghel, M., Gomez, R. Vazquez, Regueiro, P. Vazquez, Sierra, C. Vázquez, Vecchi, S., Velthuis, J. J., Veltri, M., Venkateswaran, A., Boettcher, T., Veronesi, M., Vesterinen, M., Vieira, D., Diaz, M. Vieites, Viemann, H., Vilasis-Cardona, X., Figueras, E. Vilella, Vincent, P., Vitali, G., Vollhardt, A., Boldyrev, A., Bruch, D. Vom, Vorobyev, A., Vorobyev, V., Voropaev, N., Waldi, R., Walsh, J., Wang, C., Wang, Jialu, Wang, Jianchun, Wang, Jianqiao, Akar, S., Bondar, A., Wang, Jike, Wang, M., Wang, R., Wang, Y., Wang, Z., Wark, H. M., Watson, N. K., Weber, S. G., Websdale, D., Weisser, C., Bondar, N., Westhenry, B. D. C., White, D. J., Whitehead, M., Wiedner, D., Wilkinson, G., Wilkinson, M., Williams, I., Williams, Mike, Williams, Mark Richard James, Wilson, F. F., Borghi, S., Wislicki, W., Witek, M., Witola, L., Wormser, G., Wotton, S. A., Wu, H., Wyllie, K., Xiang, Z., Xiao, D., Xie, Y., Borisyak, M., Xu, A., Xu, J., Xu, L., Xu, M., Xu, Q., Xu, Zehua, Xu, Zhihao, Yang, D., Yang, S., Yang, Y., Borsato, M., Yang, Zhenwei, Yang, Zishuo, Yao, Y., Yeomans, L. E., Yin, H., Yu, J., Yuan, X., Yushchenko, O., Zaffaroni, E., Zarebski, K. A., Borsuk, J. T., Zavertyaev, M., Zdybal, M., Zenaiev, O., Zeng, M., Zhang, D., Zhang, L., Zhang, S., Zhang, Yanxi, Zhang, Yu, Zhelezov, A., Bouchiba, S. A., Zheng, Y., Zhou, X., Zhou, Y., Zhu, X., Zhukov, V., Zonneveld, J. B., Zucchelli, S., Zuliani, D., Zunica, G., LHCb Collaboration, Bowcock, T. J. V., Boyer, A., Bozzi, C., Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), LHCb, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
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J/psi(3100): radiative decay ,interaction [p nucleus] ,8160 GeV-cms ,Physics::Instrumentation and Detectors ,p nucleus: interaction ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,nucl-ex ,chi/c1(3510) ,High Energy Physics - Experiment ,radiative decay [J/psi(3100)] ,chi/c2(3555) ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,calorimeter ,Nuclear Physics - Experiment ,ddc:530 ,chi mesons: direct production ,pair production [muon] ,Nuclear Experiment ,lead ,hep-ex ,photon ,nuclear matter: effect ,ratio: measured [cross section] ,LHC-B ,direct production [chi mesons] ,muon: pair production ,production [charmonium] ,CERN LHC Coll ,rapidity ,cross section: ratio: measured ,hadronic decay [chi mesons] ,High Energy Physics::Experiment ,effect [nuclear matter] ,chi mesons: hadronic decay ,Particle Physics - Experiment ,charmonium: production ,experimental results - Abstract
Physical review / C 103(6), 064905 (2021). doi:10.1103/PhysRevC.103.064905, This Letter reports the first measurement of prompt $\chi_{c1}$ and $\chi_{c2}$ charmonium production in nuclear collisions at Large Hadron Collider energies. The cross-section ratio $\sigma(\chi_{c2}) / \sigma(\chi_{c1})$ is measured in $p$Pb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV, collected with the LHCb experiment. The $\chi_{c1,2}$ states are reconstructed via their decay to a $\rm{J}/\psi$ meson, subsequently decaying into a pair of oppositely charged muons, and a photon, which is reconstructed in the calorimeter or via its conversion in the detector material. The cross-section ratio is consistent with unity in the two considered rapidity regions. Comparison with a corresponding cross-section ratio previously measured by the LHCb collaboration in $pp$ collisions suggests that $\chi_{c1}$ and $\chi_{c2}$ states are similarly affected by nuclear effects occurring in $p$Pb collisions., Published by Inst., Woodbury, NY
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- 2021
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