565 research outputs found
Azimuthal correlations in Z +jets events in proton–proton collisions at s = 13 Te V
No full textAbstract The production of Z bosons associated with jets is measured in pp collisions at s = 13 Te V with data recorded with the CMS experiment at the LHC corresponding to an integrated luminosity of 36.3 fb - 1 . The multiplicity of jets with transverse momentum p T > 30 Ge V is measured for different regions of the Z boson’s p T ( Z ) , from lower than 10 Ge V to higher than 100 Ge V . The azimuthal correlation Δ ϕ between the Z boson and the leading jet, as well as the correlations between the two leading jets are measured in three regions of p T ( Z ) . The measurements are compared with several predictions at leading and next-to-leading orders, interfaced with parton showers. Predictions based on transverse-momentum dependent parton distributions and corresponding parton showers give a good description of the measurement in the regions where multiple parton interactions and higher jet multiplicities are not important. The effects of multiple parton interactions are shown to be important to correctly describe the measured spectra in the low p T ( Z ) regions
Author Correction: A portrait of the Higgs boson by the CMS experiment ten years after the discovery
No full textIn the version of this article initially published, CMS Collaboration author names, affiliations and acknowledgements were omitted and have now been included in the HTML and PDF versions of the articl
Ability of non-health care providers to perform adequate cardiopulmonary resuscitation after attending a quite short course
No full textMeasurement of the mass dependence of the transverse momentum of lepton pairs in Drell–Yan production in proton–proton collisions at s = 13 Te V
No full textAbstract The double differential cross sections of the Drell–Yan lepton pair ( ℓ + ℓ - , dielectron or dimuon) production are measured as functions of the invariant mass m ℓ ℓ , transverse momentum p T ( ℓ ℓ ) , and φ η ∗ . The φ η ∗ observable, derived from angular measurements of the leptons and highly correlated with p T ( ℓ ℓ ) , is used to probe the low- p T ( ℓ ℓ ) region in a complementary way. Dilepton masses up to 1 Te V are investigated. Additionally, a measurement is performed requiring at least one jet in the final state. To benefit from partial cancellation of the systematic uncertainty, the ratios of the differential cross sections for various m ℓ ℓ ranges to those in the Z mass peak interval are presented. The collected data correspond to an integrated luminosity of 36.3 fb - 1 of proton–proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13 Te V . Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation
Two-particle azimuthal correlations in γp interactions using pPb collisions at √s_NN=8.16 TeV
No full textThe first measurements of the Fourier coefficients (V-n Delta) of the azimuthal distributions of charged hadrons emitted from photon-proton (gamma p) interactions are presented. The data are extracted from 68.8nb(-1) of ultra-peripheral proton-lead (pPb) collisions at root s(NN)= 8.16 TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This gamma p system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The V-n Delta coefficients are presented in ranges of event multiplicity and transverse momentum (p(T)) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean p(T) of charged particles is smaller in gamma p than in pPb collisions. For both the gamma p and pPb samples, V-1 Delta is negative, V-2 Delta is positive, and V-3 Delta consistent with 0. For each multiplicity and p(T) range, V-2 Delta is larger for gamma p events. The gamma p data are consistent with model predictions that have no collective effects. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3)
Measurements of the Higgs boson production cross section and couplings in the W boson pair decay channel in proton-proton collisions at s = 13 Te V
No full textAbstract Production cross sections of the standard model Higgs boson decaying to a pair of W bosons are measured in proton-proton collisions at a center-of-mass energy of 13 Te V . The analysis targets Higgs bosons produced via gluon fusion, vector boson fusion, and in association with a W or Z boson. Candidate events are required to have at least two charged leptons and moderate missing transverse momentum, targeting events with at least one leptonically decaying W boson originating from the Higgs boson. Results are presented in the form of inclusive and differential cross sections in the simplified template cross section framework, as well as couplings of the Higgs boson to vector bosons and fermions. The data set collected by the CMS detector during 2016–2018 is used, corresponding to an integrated luminosity of 138 fb - 1 . The signal strength modifier μ , defined as the ratio of the observed production rate in a given decay channel to the standard model expectation, is measured to be μ = 0 . 95 - 0.09 + 0.10 . All results are found to be compatible with the standard model within the uncertainties
Search for heavy resonances decaying to Z (νν¯) V ( qq¯′) in proton-proton collisions at root s=13 TeV
No full text(…) MCIN/AEI and PCTI (Spain). Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 724704, 752730, 758316, 765710, 824093, 884104, and COST Action CA16108 (European Union); the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias (…)Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., Chatterjee, S., Dragicevic, M., Escalante Del Valle, A., Frühwirth, R., Jeitler, M., Krammer, N., Lechner, L., Liko, D., Mikulec, I., Paulitsch, P., Pitters, F.M., Schieck, J., Schöfbeck, R., Spanring, M., Templ, S., Waltenberger, W., Wulz, C.-E., Chekhovsky, V., Litomin, A., Makarenko, V., Darwish, M.R., De Wolf, E.A., Janssen, X., Kello, T., Lelek, A., Rejeb Sfar, H., Van Mechelen, P., Van Putte, S., Van Remortel, N., Blekman, F., Bols, E.S., D'Hondt, J., De Clercq, J., Delcourt, M., El Faham, H., Lowette, S., Moortgat, S., Morton, A., Müller, D., Sahasransu, A.R., Tavernier, S., Van Doninck, W., Van Mulders, P., Beghin, D., Bilin, B., Clerbaux, B., De Lentdecker, G., Favart, L., Grebenyuk, A., Kalsi, A.K., Lee, K., Mahdavikhorrami, M., Makarenko, I., Moureaux, L., Pétré, L., Popov, A., Postiau, N., Starling, E., Thomas, L., Vanden Bemden, M., Vander Velde, C., Vanlaer, P., Vannerom, D., Wezenbeek, L., Cornelis, T., Dobur, D., Knolle, J., Lambrecht, L., Mestdach, G., Niedziela, M., Roskas, C., Samalan, A., Skovpen, K., Tytgat, M., Verbeke, W., Vermassen, B., Vit, M., Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I.S., Giammanco, A., Jaffel, K., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Tran, T.T., Vischia, P., Wertz, S., Alves, G.A., Hensel, C., Moraes, A., Aldá Júnior, W.L., Alves Gallo Pereira, M., Barroso Ferreira Filho, M., Brandao Malbouisson, H., Carvalho, W., Chinellato, J., Da Costa, E.M., Da Silveira, G.G., De Jesus Damiao, D., Fonseca De Souza, S., Matos Figueiredo, D., Mora Herrera, C., Mota Amarilo, K., Mundim, L., Nogima, H., Rebello Teles, P., Santoro, A., Silva Do Amaral, S.M., Sznajder, A., Thiel, M., Torres Da Silva De Araujo, F., Vilela Pereira, A., Bernardes, C.A., Calligaris, L., Tomei, T.R.F.P., Gregores, E.M., Lemos, D.S., Mercadante, P.G., Novaes, S.F., Padula, S.S., Aleksandrov, A., Antchev, G., Hadjiiska, R., Iaydjiev, P., Misheva, M., Rodozov, M., Shopova, M., Sultanov, G., Dimitrov, A., Ivanov, T., Litov, L., Pavlov, B., Petkov, P., Petrov, A., Cheng, T., Guo, Q., Javaid, T., Mittal, M., Wang, H., Yuan, L., Ahmad, M., Bauer, G., Dozen, C., Hu, Z., Martins, J., Wang, Y., Yi, K., Chapon, E., Chen, G.M., Chen, H.S., Chen, M., Iemmi, F., Kapoor, A., Leggat, D., Liao, H., Liu, Z.-A., Milosevic, V., Monti, F., Sharma, R., Tao, J., Thomas-Wilsker, J., Wang, J., Zhang, H., Zhang, S., Zhao, J., Agapitos, A., An, Y., Ban, Y., Chen, C., Levin, A., Li, Q., Lyu, X., Mao, Y., Qian, S.J., Wang, D., Wang, Q., Xiao, J., Lu, M., You, Z., Gao, X., Okawa, H., Lin, Z., Xiao, M., Avila, C., Cabrera, A., Florez, C., Fraga, J., Sarkar, A., Segura Delgado, M.A., Mejia Guisao, J., Ramirez, F., Ruiz Alvarez, J.D., Salazar González, C.A., Giljanovic, D., Godinovic, N., Lelas, D., Puljak, I., Antunovic, Z., Kovac, M., Sculac, T., Brigljevic, V., Ferencek, D., Majumder, D., Roguljic, M., Starodumov, A., Susa, T., Attikis, A., Christoforou, K., Erodotou, E., Ioannou, A., Kole, G., Kolosova, M., Konstantinou, S., Mousa, J., Nicolaou, C., Ptochos, F., Razis, P.A., Rykaczewski, H., Saka, H., Finger, M., Finger, M., Jr., Kveton, A., Ayala, E., Carrera Jarrin, E., Abdalla, H., Ellithi Kamel, A., Mahmoud, M.A., Mohammed, Y., Bhowmik, S., Dewanjee, R.K., Ehataht, K., Kadastik, M., Nandan, S., Nielsen, C., Pata, J., Raidal, M., Tani, L., Veelken, C., Eerola, P., Forthomme, L., Kirschenmann, H., Osterberg, K., Voutilainen, M., Bharthuar, S., Brücken, E., Garcia, F., Havukainen, J., Kim, M.S., Kinnunen, R., Lampén, T., Lassila-Perini, K., Lehti, S., Lindén, T., Lotti, M., Martikainen, L., Myllymäki, M., Ott, J., Siikonen, H., Tuominen, E., Tuominiemi, J., Luukka, P., Petrow, H., Tuuva, T., Amendola, C., Besancon, M., Couderc, F., Dejardin, M., Denegri, D., Faure, J.L., Ferri, F., Ganjour, S., Givernaud, A., Gras, P., Hamel De Monchenault, G., Jarry, P., Lenzi, B., Locci, E., Malcles, J., Rander, J., Rosowsky, A., Sahin, M.Ö., Savoy-Navarro, A., Titov, M., Yu, G.B., Ahuja, S., Beaudette, F., Bonanomi, M., Buchot Perraguin, A., Busson, P., Cappati, A., Charlot, C., Davignon, O., Diab, B., Falmagne, G., Ghosh, S., Granier De Cassagnac, R., Hakimi, A., Kucher, I., Motta, J., Nguyen, M., Ochando, C., Paganini, P., Rembser, J., Salerno, R., Sauvan, J.B., Sirois, Y., Tarabini, A., Zabi, A., Zghiche, A., Agram, J.-L., Andrea, J., Apparu, D., Bloch, D., Bourgatte, G., Brom, J.-M., Chabert, E.C., Collard, C., Darej, D., Fontaine, J.-C., Goerlach, U., Grimault, C., Le Bihan, A.-C., Nibigira, E., Van Hove, P., Asilar, E., Beauceron, S., Bernet, C., Boudoul, G., Camen, C., Carle, A., Chanon, N., Contardo, D., Depasse, P., El Mamouni, H., Fay, J., Gascon, S., Gouzevitch, M., Ille, B., Laktineh, I.B., Lattaud, H., Lesauvage, A., Lethuillier, M., Mirabito, L., Perries, S., Shchablo, K., Sordini, V., Torterotot, L., Touquet, G., Vander Donckt, M., Viret, S., Adamov, G., Lomidze, I., Tsamalaidze, Z., Feld, L., Klein, K., Lipinski, M., Meuser, D., Pauls, A., Rauch, M.P., Röwert, N., Schulz, J., Teroerde, M., Dodonova, A., Eliseev, D., Erdmann, M., Fackeldey, P., Fischer, B., Ghosh, S., Hebbeker, T., Hoepfner, K., Ivone, F., Keller, H., Mastrolorenzo, L., Merschmeyer, M., Meyer, A., Mocellin, G., Mondal, S., Mukherjee, S., Noll, D., Novak, A., Pook, T., Pozdnyakov, A., Rath, Y., Reithler, H., Roemer, J., Schmidt, A., Schuler, S.C., Sharma, A., Vigilante, L., Wiedenbeck, S., Zaleski, S., Dziwok, C., Flügge, G., Haj Ahmad, W., Hlushchenko, O., Kress, T., Nowack, A., Pistone, C., Pooth, O., Roy, D., Sert, H., Stahl, A., Ziemons, T., Aarup Petersen, H., Aldaya Martin, M., Asmuss, P., Babounikau, I., Baxter, S., Behnke, O., Bermúdez Martínez, A., Bhattacharya, S., Bin Anuar, A.A., Borras, K., Botta, V., Brunner, D., Campbell, A., Cardini, A., Cheng, C., Colombina, F., Consuegra Rodríguez, S., Correia Silva, G., Danilov, V., Didukh, L., Eckerlin, G., Eckstein, D., Estevez Banos, L.I., Filatov, O., Gallo, E., Geiser, A., Giraldi, A., Grohsjean, A., Guthoff, M., Jafari, A., Jomhari, N.Z., Jung, H., Kasem, A., Kasemann, M., Kaveh, H., Kleinwort, C., Krücker, D., Lange, W., Lidrych, J., Lipka, K., Lohmann, W., Mankel, R., Melzer-Pellmann, I.-A., Mendizabal Morentin, M., Metwally, J., Meyer, A.B., Meyer, M., Mnich, J., Mussgiller, A., Otarid, Y., Pérez Adán, D., Pitzl, D., Raspereza, A., Ribeiro Lopes, B., Rübenach, J., Saggio, A., Saibel, A., Savitskyi, M., Scham, M., Scheurer, V., Schütze, P., Schwanenberger, C., Singh, A., Sosa Ricardo, R.E., Stafford, D., Tonon, N., Turkot, O., Van De Klundert, M., Walsh, R., Walter, D., Wen, Y., Wichmann, K., Wiens, L., Wissing, C., Wuchterl, S., Aggleton, R., Albrecht, S., Bein, S., Benato, L., Benecke, A., Connor, P., De Leo, K., Eich, M., Feindt, F., Fröhlich, A., Garbers, C., Garutti, E., Gunnellini, P., Haller, J., Hinzmann, A., Kasieczka, G., Klanner, R., Kogler, R., Kramer, T., Kutzner, V., Lange, J., Lange, T., Lobanov, A., Malara, A., Nigamova, A., Pena Rodriguez, K.J., Rieger, O., Schleper, P., Schröder, M., Schwandt, J., Schwarz, D., Sonneveld, J., Stadie, H., Steinbrück, G., Tews, A., Vormwald, B., Zoi, I., Bechtel, J., Berger, T., Butz, E., Caspart, R., Chwalek, T., De Boer, W., Dierlamm, A., Droll, A., El Morabit, K., Faltermann, N., Giffels, M., Gosewisch, J.O., Gottmann, A., Hartmann, F., Heidecker, C., Husemann, U., Katkov, I., Keicher, P., Koppenhöfer, R., Maier, S., Metzler, M., Mitra, S., Müller, T., Neukum, M., Nürnberg, A., Quast, G., Rabbertz, K., Rauser, J., Savoiu, D., Schnepf, M., Seith, D., Shvetsov, I., Simonis, H.J., Ulrich, R., Van Der Linden, J., Von Cube, R.F., Wassmer, M., Weber, M., Wieland, S., Wolf, R., Wozniewski, S., Wunsch, S., Anagnostou, G., Daskalakis, G., Geralis, T., Kyriakis, A., Loukas, D., Stakia, A., Diamantopoulou, M., Karasavvas, D., Karathanasis, G., Kontaxakis, P., Koraka, C.K., Manousakis-Katsikakis, A., Panagiotou, A., Papavergou, I., Saoulidou, N., Theofilatos, K., Tziaferi, E., Vellidis, K., Vourliotis, E., Bakas, G., Kousouris, K., Papakrivopoulos, I., Tsipolitis, G., Zacharopoulou, A., Evangelou, I., Foudas, C., Gianneios, P., Katsoulis, P., Kokkas, P., Manthos, N., Papadopoulos, I., Strologas, J., Csanad, M., Farkas, K., Gadallah, M.M.A., Lökös, S., Major, P., Mandal, K., Mehta, A., Pasztor, G., Rádl, A.J., Surányi, O., Veres, G.I., Bartók, M., Bencze, G., Hajdu, C., Horvath, D., Sikler, F., Veszpremi, V., Vesztergombi, G., Czellar, S., Karancsi, J., Molnar, J., Szillasi, Z., Teyssier, D., Raics, P., Trocsanyi, Z.L., Ujvari, B., Csorgo, T., Nemes, F., Novak, T., Komaragiri, J.R., Kumar, D., Panwar, L., Tiwari, P.C., Bahinipati, S., Kar, C., Mal, P., Mishra, T., Muraleedharan Nair Bindhu, V.K., Nayak, A., Saha, P., Sur, N., Swain, S.K., Vats, D., Bansal, S., Beri, S.B., Bhatnagar, V., Chaudhary, G., Chauhan, S., Dhingra, N., Gupta, R., Kaur, A., Kaur, M., Kaur, S., Kumari, P., Meena, M., Sandeep, K., Singh, J.B., Virdi, A.K., Ahmed, A., Bhardwaj, A., Choudhary, B.C., Gola, M., Keshri, S., Kumar, A., Naimuddin, M., Priyanka, P., Ranjan, K., Shah, A., Bharti, M., Bhattacharya, R., Bhattacharya, S., Bhowmik, D., Dutta, S., Dutta, S., Gomber, B., Maity, M., Palit, P., Rout, P.K., Saha, G., Sahu, B., Sarkar, S., Sharan, M., Singh, B., Thakur, S., Behera, P.K., Behera, S.C., Kalbhor, P., Muhammad, A., Pradhan, R., Pujahari, P.R., Sharma, A., Sikdar, A.K., Dutta, D., Jha, V., Kumar, V., Mishra, D.K., Naskar, K., Netrakanti, P.K., Pant, L.M., Shukla, P., Aziz, T., Dugad, S., Kumar, M., Sarkar, U., Banerjee, S., Chudasama, R., Guchait, M., Karmakar, S., Kumar, S., Majumder, G., Mazumdar, K., Mukherjee, S., Alpana, K., Dube, S., Kansal, B., Laha, A., Pandey, S., Rane, A., Rastogi, A., Sharma, S., Bakhshiansohi, H., Zeinali, M., Chenarani, S., Etesami, S.M., Khakzad, M., Mohammadi Najafabadi, M., Grunewald, M., Abbrescia, M., Aly, R., Aruta, C., Colaleo, A., Creanza, D., De Filippis, N., De Palma, M., Di Florio, A., Di Pilato, A., Elmetenawee, W., Fiore, L., Gelmi, A., Gul, M., Iaselli, G., Ince, M., Lezki, S., Maggi, G., Maggi, M., Margjeka, I., Mastrapasqua, V., Merlin, J.A., My, S., Nuzzo, S., Pellecchia, A., Pompili, A., Pugliese, G., Ranieri, A., Selvaggi, G., Silvestris, L., Simone, F.M., Venditti, R., Verwilligen, P., Abbiendi, G., Battilana, C., Bonacorsi, D., Borgonovi, L., Brigliadori, L., Campanini, R., Capiluppi, P., Castro, A., Cavallo, F.R., Cuffiani, M., Dallavalle, G.M., Diotalevi, T., Fabbri, F., Fanfani, A., Giacomelli, P., Giommi, L., Grandi, C., Guiducci, L., Lo Meo, S., Lunerti, L., Marcellini, S., Masetti, G., Navarria, F.L., Perrotta, A., Primavera, F., Rossi, A.M., Rovelli, T., Siroli, G.P., Albergo, S., Costa, S., Di Mattia, A., Potenza, R., Tricomi, A., Tuve, C., Barbagli, G., Cassese, A., Ceccarelli, R., Ciulli, V., Civinini, C., D'Alessandro, R., Focardi, E., Latino, G., Lenzi, P., Lizzo, M., Meschini, M., Paoletti, S., Seidita, R., Sguazzoni, G., Viliani, L., Benussi, L., Bianco, S., Piccolo, D., Bozzo, M., Ferro, F., Mulargia, R., Robutti, E., Tosi, S., Benaglia, A., Brivio, F., Cetorelli, F., Ciriolo, V., De Guio, F., Dinardo, M.E., Dini, P., Gennai, S., Ghezzi, A., Govoni, P., Guzzi, L., Malberti, M., Malvezzi, S., Massironi, A., Menasce, D., Moroni, L., Paganoni, M., Pedrini, D., Ragazzi, S., Redaelli, N., Tabarelli De Fatis, T., Valsecchi, D., Zuolo, D., Buontempo, S., Carnevali, F., Cavallo, N., De Iorio, A., Fabozzi, F., Iorio, A.O.M., Lista, L., Meola, S., Paolucci, P., Rossi, B., Sciacca, C., Azzi, P., Bacchetta, N., Bisello, D., Bortignon, P., Bragagnolo, A., Carlin, R., Checchia, P., Dorigo, T., Dosselli, U., Gasparini, F., Gasparini, U., Hoh, S.Y., Layer, L., Margoni, M., Meneguzzo, A.T., Pazzini, J., Presilla, M., Ronchese, P., Rossin, R., Simonetto, F., Strong, G., Tosi, M., Yarar, H., Zanetti, M., Zotto, P., Zucchetta, A., Zumerle, G., Aime', C., Braghieri, A., Calzaferri, S., Fiorina, D., Montagna, P., Ratti, S.P., Re, V., Riccardi, C., Salvini, P., Vai, I., Vitulo, P., Asenov, P., Bilei, G.M., Ciangottini, D., Fanò, L., Lariccia, P., Magherini, M., Mantovani, G., Mariani, V., Menichelli, M., Moscatelli, F., Piccinelli, A., Rossi, A., Santocchia, A., Spiga, D., Tedeschi, T., Azzurri, P., Bagliesi, G., Bertacchi, V., Bianchini, L., Boccali, T., Bossini, E., Castaldi, R., Ciocci, M.A., D'Amante, V., Dell'Orso, R., Di Domenico, M.R., Donato, S., Giassi, A., Ligabue, F., Manca, E., Mandorli, G., Messineo, A., Palla, F., Parolia, S., Ramirez-Sanchez, G., Rizzi, A., Rolandi, G., Roy Chowdhury, S., Scribano, 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J., Lee, J., Lee, S.W., Moon, C.S., Oh, Y.D., Pak, S.I., Radburn-Smith, B.C., Sekmen, S., Yang, Y.C., Kim, H., Moon, D.H., Francois, B., Kim, T.J., Park, J., Cho, S., Choi, S., Go, Y., Hong, B., Lee, K., Lee, K.S., Lim, J., Park, J., Park, S.K., Yoo, J., Goh, J., Gurtu, A., Kim, H.S., Kim, Y., Almond, J., Bhyun, J.H., Choi, J., Jeon, S., Kim, J., Kim, J.S., Ko, S., Kwon, H., Lee, H., Lee, S., Oh, B.H., Oh, M., Oh, S.B., Seo, H., Yang, U.K., Yoon, I., Jang, W., Jeon, D., Kang, D.Y., Kang, Y., Kim, J.H., Kim, S., Ko, B., Lee, J.S.H., Lee, Y., Park, I.C., Roh, Y., Ryu, M.S., Song, D., Watson, I.J., Yang, S., Ha, S., Yoo, H.D., Choi, M., Jeong, Y., Lee, H., Lee, Y., Yu, I., Beyrouthy, T., Maghrbi, Y., Torims, T., Veckalns, V., Ambrozas, M., Carvalho Antunes De Oliveira, A., Juodagalvis, A., Rinkevicius, A., Tamulaitis, G., Bin Norjoharuddeen, N., Wan Abdullah, W.A.T., Yusli, M.N., Zolkapli, Z., Benitez, J.F., Castaneda Hernandez, A., León Coello, M., Murillo Quijada, J.A., Sehrawat, A., 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Azimuthal anisotropy of dijet events in PbPb collisions at s NN = 5.02 TeV
No full textAbstract The path-length dependent parton energy loss within the dense partonic medium created in lead-lead collisions at a nucleon-nucleon center-of-mass energy of s NN = 5.02 TeV is studied by determining the azimuthal anisotropies for dijets with high transverse momentum. The data were collected by the CMS experiment in 2018 and correspond to an integrated luminosity of 1.69 nb −1. For events containing back-to-back jets, correlations in relative azimuthal angle and pseudorapidity (η) between jets and hadrons, and between two hadrons, are constructed. The anisotropies are expressed as the Fourier expansion coefficients v n , n = 2–4 of these azimuthal distributions. The dijet v n values are extracted from long-range (1.5 < |∆η| < 2.5) components of these correlations, which suppresses the background contributions from jet fragmentation processes. Positive dijet v 2 values are observed which increase from central to more peripheral events, while the v 3 and v 4 values are consistent with zero within experimental uncertainties
Measurement of the differential t t ¯ production cross section as a function of the jet mass and extraction of the top quark mass in hadronic decays of boosted top quarks
No full textAbstract A measurement of the jet mass distribution in hadronic decays of Lorentz-boosted top quarks is presented. The measurement is performed in the lepton + jets channel of top quark pair production ( t t ¯ ) events, where the lepton is an electron or muon. The products of the hadronic top quark decay are reconstructed using a single large-radius jet with transverse momentum greater than 400 Ge V . The data were collected with the CMS detector at the LHC in proton-proton collisions and correspond to an integrated luminosity of 138 fb - 1 . The differential t t ¯ production cross section as a function of the jet mass is unfolded to the particle level and is used to extract the top quark mass. The jet mass scale is calibrated using the hadronic W boson decay within the large-radius jet. The uncertainties in the modelling of the final state radiation are reduced by studying angular correlations in the jet substructure. These developments lead to a significant increase in precision, and a top quark mass of 173.06 ± 0.84 Ge V
Search for Higgs Boson Decay to a Charm Quark-Antiquark Pair in Proton-Proton Collisions at
No full textA search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H → c c ¯ , produced in association with a leptonically decaying V ( W or Z ) boson is presented. The search is performed with proton-proton collisions at s = 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb - 1 . Novel charm jet identification and analysis methods using machine learning techniques are employed. The analysis is validated by searching for Z → c c ¯ in V Z events, leading to its first observation at a hadron collider with a significance of 5.7 standard deviations. The observed (expected) upper limit on σ ( V H ) B ( H → c c ¯ ) is 0.94 ( 0.50 - 0.15 + 0.22 )pb at 95% confidence level (C.L.), corresponding to 14 ( 7.6 - 2.3 + 3.4 ) times the standard model prediction. For the Higgs-charm Yukawa coupling modifier, κ c , the observed (expected) 95% C.L. interval is 1.1 < | κ c | < 5.5 ( | κ c | < 3.4 ), the most stringent constraint to date
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