Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at sNN =5 TeV

Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Aliouche, Z.; Alkhazov, G.; Alvarez Cartelle, P.; Amato, S.; Amey, J.L.; Amhis, Y.; An, L.; Anderlini, L.; Andreianov, A.; Andreotti, M.; Archilli, F.; Artamonov, A.; Artuso, M.; Arzymatov, K.; Aslanides, E.; Atzeni, M.; Audurier, B.; Bachmann, S.; Bachmayer, M.; Back, J.J.; Baladron Rodriguez, P.; Balagura, V.; Baldini, W.; Baptista Leite, J.; Barlow, R.J.; Barsuk, S.; Barter, W.; Bartolini, M.; Baryshnikov, F.; Basels, J.M.; Bassi, G.; Batsukh, B.; Battig, A.; Bay, A.; Becker, M.; Bedeschi, F.; Bediaga, I.; Beiter, A.; Belavin, V.; Belin, S.; Bellee, V.; Belous, K.; Belov, I.; Belyaev, I.; Bencivenni, G.; Ben-Haim, E.; Berezhnoy, A.; Bernet, R.; Berninghoff, D.; Bernstein, H.C.; Bertella, C.; Bertolin, A.; Betancourt, C.; Betti, F.; Bezshyiko, I.; Bhasin, S.; Bhom, J.; Bian, L.; Bieker, M.S.; Bifani, S.; Billoir, P.; Birch, M.; Bishop, F.C.R.; Bitadze, A.; Bizzeti, A.; Bjørn, M.; Blago, M.P.; Blake, T.; Blanc, F.; Blusk, S.; Bobulska, D.; Boelhauve, J.A.; Boente Garcia, O.; Boettcher, T.; Boldyrev, A.; Bondar, A.; Bondar, N.; Borghi, S.; Borisyak, M.; Borsato, M.; Borsuk, J.T.; Bouchiba, S.A.; Bowcock, T.J.V.; Boyer, A.; Bozzi, C.; Bradley, M.J.; Braun, S.; Brea Rodriguez, A.; Brodski, M.; Brodzicka, J.; Brossa Gonzalo, A.; Brundu, D.; Buonaura, A.; Burke, A.T.; Burr, C.; Bursche, A.; Butkevich, A.; Butter, J.S.; Buytaert, J.; Byczynski, W.; Cadeddu, S.; Cai, H.; Calabrese, R.; Calefice, L.; Calero Diaz, L.; Cali, S.; Calladine, R.; Calvi, M.; Calvo Gomez, M.; Camargo Magalhaes, P.; Campana, P.; Campoverde Quezada, A.F.; Capelli, S.; Capriotti, L.; Carbone, A.; Carboni, G.; Cardinale, R.; Cardini, A.; Carli, I.; Carniti, P.; Carus, L.; Carvalho Akiba, K.; Casais Vidal, A.; Casse, G.; Cattaneo, M.; Cavallero, G.; Celani, S.; Cerasoli, J.; Chadwick, A.J.; Chapman, M.G.; Charles, M.; Charpentier, P.; Chatzikonstantinidis, G.; Chavez Barajas, C.A.; Chefdeville, M.; Chen, C.; Chen, S.; Chernov, A.; Chobanova, V.; Cholak, S.; Chrzaszcz, M.; Chubykin, A.; Chulikov, V.; Ciambrone, P.; Cicala, M.F.; Cid Vidal, X.; Ciezarek, G.; Clarke, P.E.L.; Clemencic, M.; Cliff, H.V.; Closier, J.; Cobbledick, J.L.; Coco, V.; Coelho, J.A.B.; Cogan, J.; Cogneras, E.; Cojocariu, L.; Collins, P.; Colombo, T.; Congedo, L.; Contu, A.; Cooke, N.; Coombs, G.; Corredoira, I.; Corti, G.; Costa Sobral, C.M.; Couturier, B.; Craik, D.C.; Crkovská, J.; Cruz Torres, M.; Currie, R.; Da Silva, C.L.; Dadabaev, S.; Dai, L.; Dall'Occo, E.; Dalseno, J.; D'Ambrosio, C.; Danilina, A.; D'Argent, P.; Davies, J.E.; Davis, A.; De Aguiar Francisco, O.; De Bruyn, K.; De Capua, S.; De Cian, M.; De Miranda, J.M.; De Paula, L.; De Serio, M.; De Simone, D.; De Simone, P.; de Vries, J.A.; Dean, C.T.; Decamp, D.; Del Buono, L.; Delaney, B.; Dembinski, H.; Dendek, A.; Denysenko, V.; Derkach, D.; Deschamps, O.; Desse, F.; Dettori, F.; Dey, B.; Di Cicco, A.; Di Nezza, P.; Didenko, S.; Dieste Maronas, L.; Dijkstra, H.; Dobishuk, V.; Donohoe, A.M.; Dordei, F.; Dos Reis, A.C.; Douglas, L.; Dovbnya, A.; Downes, A.G.; Dreimanis, K.; Dudek, M.W.; Dufour, L.; Duk, V.; Durante, P.; Durham, J.M.; Dutta, D.; Dziurda, A.; Dzyuba, A.; Easo, S.; Egede, U.; Egorychev, V.; Eidelman, S.; Eisenhardt, S.; Ek-In, S.; Eklund, L.; Ely, S.; Ene, A.; Epple, E.; Escher, S.; Eschle, J.; Esen, S.; Evans, T.; Falabella, A.; Fan, J.; Fan, Y.; Fang, B.; Farry, S.; Fazzini, D.; Féo, M.; Fernandez Prieto, A.; Fernez, A.D.; Ferrari, F.; Ferreira Lopes, L.; Ferreira Rodrigues, F.; Ferreres Sole, S.; Ferrillo, M.; Ferro-Luzzi, M.; Filippov, S.; Fini, R.A.; Fiorini, M.; Firlej, M.; Fischer, K.M.; Fitzgerald, D.S.; Fitzpatrick, C.; Fiutowski, T.; Fkiaras, A.; Fleuret, F.; Fontana, M.; Fontanelli, F.; Forty, R.; Franco Lima, V.; Franco Sevilla, M.; Frank, M.; Franzoso, E.; Frau, G.; Frei, C.; Friday, D.A.; Fu, J.; Fuehring, Q.; Funk, W.; Gabriel, E.; Gaintseva, T.; Gallas Torreira, A.; Galli, D.; Gambetta, S.; Gan, Y.; Gandelman, M.; Gandini, P.; Gao, Y.; Garau, M.; Garcia Martin, L.M.; Garcia Moreno, P.; García Pardiñas, J.; Garcia Plana, B.; Garcia Rosales, F.A.; Garrido, L.; Gaspar, C.; Geertsema, R.E.; Gerick, D.; Gerken, L.L.; Gersabeck, E.; Gersabeck, M.; Gershon, T.; Gerstel, D.; Ghez, P.; Gibson, V.; Giemza, H.K.; Giovannetti, M.; Gioventù, A.; Gironella Gironell, P.; Giubega, L.; Giugliano, C.; Gizdov, K.; Gkougkousis, E.L.; Gligorov, V.V.; Göbel, C.; Golobardes, E.; Golubkov, D.; Golutvin, A.; Gomes, A.; Gomez Fernandez, S.; Goncalves Abrantes, F.; Goncerz, M.; Gong, G.; Gorbounov, P.; Gorelov, I.V.; Gotti, C.; Govorkova, E.; Grabowski, J.P.; Grammatico, T.; Granado Cardoso, L.A.; Graugés, E.; Graverini, E.; Graziani, G.; Grecu, A.; Greeven, L.M.; Griffith, P.; Grillo, L.; Gromov, S.; Gruberg Cazon, B.R.; Gu, C.; Guarise, M.; Günther, P.A.; Gushchin, E.; Guth, A.; Guz, Y.; Gys, T.; Hadavizadeh, T.; Haefeli, G.; Haen, C.; Haimberger, J.; Halewood-Leagas, T.; Hamilton, P.M.; Hammerich, J.P.; Han, Q.; Han, X.; Hancock, T.H.; Hansmann-Menzemer, S.; Harnew, N.; Harrison, T.; Hasse, C.; Hatch, M.; He, J.; Hecker, M.; Heijhoff, K.; Heinicke, K.; Hennequin, A.M.; Hennessy, K.; Henry, L.; Heuel, J.; Hicheur, A.; Hill, D.; Hilton, M.; Hollitt, S.E.; Hu, J.; Hu, J.; Hu, W.; Hu, X.; Huang, W.; Huang, X.; Hulsbergen, W.; Hunter, R.J.; Hushchyn, M.; Hutchcroft, D.; Hynds, D.; Ibis, P.; Idzik, M.; Ilin, D.; Ilten, P.; Inglessi, A.; Ishteev, A.; Ivshin, K.; Jacobsson, R.; Jakobsen, S.; Jans, E.; Jashal, B.K.; Jawahery, A.; Jevtic, V.; Jiang, F.; John, M.; Johnson, D.; Jones, C.R.; Jones, T.P.; Jost, B.; Jurik, N.; Kandybei, S.; Kang, Y.; Karacson, M.; Karpov, M.; Keizer, F.; Kenzie, M.; Ketel, T.; Khanji, B.; Kharisova, A.; Kholodenko, S.; Kirn, T.; Kirsebom, V.S.; Kitouni, O.; Klaver, S.; Klimaszewski, K.; Koliiev, S.; Kondybayeva, A.; Konoplyannikov, A.; Kopciewicz, P.; Kopecna, R.; Koppenburg, P.; Korolev, M.; Kostiuk, I.; Kot, O.; Kotriakhova, S.; Kravchenko, P.; Kravchuk, L.; Krawczyk, R.D.; Kreps, M.; Kress, F.; Kretzschmar, S.; Krokovny, P.; Krupa, W.; Krzemien, W.; Kucewicz, W.; Kucharczyk, M.; Kudryavtsev, V.; Kuindersma, H.S.; Kunde, G.J.; Kvaratskheliya, T.; Lacarrere, D.; Lafferty, G.; Lai, A.; Lampis, A.; Lancierini, D.; Lane, J.J.; Lane, R.; Lanfranchi, G.; Langenbruch, C.; Langer, J.; Lantwin, O.; Latham, T.; Lazzari, F.; Le Gac, R.; Lee, S.H.; Lefèvre, R.; Leflat, A.; Legotin, S.; Leroy, O.; Lesiak, T.; Leverington, B.; Li, H.; Li, L.; Li, P.; Li, S.; Li, Y.; Li, Y.; Li, Z.; Liang, X.; Lin, T.; Lindner, R.; Lisovskyi, V.; Litvinov, R.; Liu, G.; Liu, H.; Liu, S.; Loi, A.; Lomba Castro, J.; Longstaff, I.; Lopes, J.H.; Lopez Solino, S.; Lovell, G.H.; Lu, Y.; Lucchesi, D.; Luchuk, S.; Lucio Martinez, M.; Lukashenko, V.; Luo, Y.; Lupato, A.; Luppi, E.; Lupton, O.; Lusiani, A.; Lyu, X.; Ma, L.; Ma, R.; Maccolini, S.; Machefert, F.; Maciuc, F.; Macko, V.; Mackowiak, P.; Maddrell-Mander, S.; Madejczyk, O.; Madhan Mohan, L.R.; Maev, O.; Maevskiy, A.; Maisuzenko, D.; Majewski, M.W.; Malczewski, J.J.; Malde, S.; Malecki, B.; Malinin, A.; Maltsev, T.; Malygina, H.; Manca, G.; Mancinelli, G.; Manuzzi, D.; Marangotto, D.; Maratas, J.; Marchand, J.F.; Marconi, U.; Mariani, S.; Marin Benito, C.; Marinangeli, M.; Marks, J.; Marshall, A.M.; Marshall, P.J.; Martellotti, G.; Martinazzoli, L.; Martinelli, M.; Martinez Santos, D.; Martinez Vidal, F.; Massafferri, A.; Materok, M.; Matev, R.; Mathad, A.; Mathe, Z.; Matiunin, V.; Matteuzzi, C.; Mattioli, K.R.; Mauri, A.; Maurice, E.; Mauricio, J.; Mazurek, M.; Mccann, M.; Mcconnell, L.; Mcgrath, T.H.; Mcnab, A.; Mcnulty, R.; Mead, J.V.; Meadows, B.; Meier, G.; Meinert, N.; Melnychuk, D.; Meloni, S.; Merk, M.; Merli, A.; Meyer Garcia, L.; Mikhasenko, M.; Milanes, D.A.; Millard, E.; Milovanovic, M.; Minard, M.; Minotti, A.; 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.; Morandin, M.; Morello, G.; Morello, M.J.; Moron, J.; Morris, A.B.; Morris, A.G.; Mountain, R.; Mu, H.; Muheim, F.; Mulder, M.; Müller, D.; Müller, K.; Murphy, C.H.; Murray, D.; Muzzetto, P.; Naik, P.; Nakada, T.; Nandakumar, R.; Nanut, T.; Nasteva, I.; Needham, M.; Neri, I.; Neri, N.; Neubert, S.; Neufeld, N.; Newcombe, R.; Nguyen, T.D.; Nguyen-Mau, C.; Niel, E.M.; Nieswand, S.; Nikitin, N.; Nolte, N.S.; Normand, C.; Nunez, C.; Oblakowska-Mucha, A.; Obraztsov, V.; O'Hanlon, D.P.; Oldeman, R.; Olivares, M.E.; Onderwater, C.J.G.; O'Neil, R.H.; Ossowska, A.; Otalora Goicochea, J.M.; Ovsiannikova, T.; Owen, P.; Oyanguren, A.; Pagare, B.; Pais, P.R.; Pajero, T.; Palano, A.; Palutan, M.; Pan, Y.; Panshin, G.; Papanestis, A.; Pappagallo, M.; Pappalardo, L.L.; Pappenheimer, C.; Parker, W.; Parkes, C.; Parkinson, C.J.; Passalacqua, B.; Passaleva, G.; Pastore, A.; Patel, M.; Patrignani, C.; Pawley, C.J.; Pearce, A.; Pellegrino, A.; Pepe Altarelli, M.; Perazzini, S.; Pereima, D.; Perret, P.; Petric, M.; Petridis, K.; Petrolini, A.; Petrov, A.; Petrucci, S.; Petruzzo, M.; Pham, T.T.H.; Philippov, A.; Pica, L.; Piccini, M.; Pietrzyk, B.; Pietrzyk, G.; Pili, M.; Pinci, D.; Pisani, F.; P K, R.; Placinta, V.; Plews, J.; Plo Casasus, M.; Polci, F.; Poli Lener, M.; Poliakova, M.; Poluektov, A.; Polukhina, N.; Polyakov, I.; Polycarpo, E.; Pomery, G.J.; Ponce, S.; Popov, D.; Popov, S.; Poslavskii, S.; Prasanth, K.; Promberger, L.; Prouve, C.; Pugatch, V.; Pullen, H.; Punzi, G.; Qi, H.; Qian, W.; Qin, J.; Qin, N.; Quagliani, R.; Quintana, B.; Raab, N.V.; Rabadan Trejo, R.I.; Rachwal, B.; Rademacker, J.H.; Rama, M.; Ramos Pernas, M.; Rangel, M.S.; Ratnikov, F.; Raven, G.; Reboud, M.; Redi, F.; Reiss, F.; Remon Alepuz, C.; Ren, Z.; Renaudin, V.; Ribatti, R.; Ricciardi, S.; Rinnert, K.; Robbe, P.; Robertson, G.; Rodrigues, A.B.; Rodrigues, E.; Rodriguez Lopez, J.A.; Rodriguez Rodriguez, E.R.R.; Rollings, A.; Roloff, P.; Romanovskiy, V.; Romero Lamas, M.; Romero Vidal, A.; Roth, J.D.; Rotondo, M.; Rudolph, M.S.; Ruf, T.; Ruiz Vidal, J.; Ryzhikov, A.; Ryzka, J.; Saborido Silva, J.J.; Sagidova, N.; Sahoo, N.; Saitta, B.; Salomoni, M.; Sanchez Gras, C.; Santacesaria, R.; Santamarina Rios, C.; Santimaria, M.; Santovetti, E.; Saranin, D.; Sarpis, G.; Sarpis, M.; Sarti, A.; Satriano, C.; Satta, A.; Saur, M.; Savrina, D.; Sazak, H.; Scantlebury Smead, L.G.; Scarabotto, A.; Schael, S.; Schiller, M.; Schindler, H.; Schmelling, M.; Schmidt, B.; Schneider, O.; Schopper, A.; Schubiger, M.; Schulte, S.; Schune, M.H.; Schwemmer, R.; Sciascia, B.; Sellam, S.; Semennikov, A.; Senghi Soares, M.; Sergi, A.; Serra, N.; Sestini, L.; Seuthe, A.; Seyfert, P.; Shang, Y.; Shangase, D.M.; Shapkin, M.; Shchemerov, I.; Shchutska, L.; Shears, T.; Shekhtman, L.; Shen, Z.; Shevchenko, V.; Shields, E.B.; Shmanin, E.; Shupperd, J.D.; Siddi, B.G.; Silva Coutinho, R.; Simi, G.; Simone, S.; Skidmore, N.; Skwarnicki, T.; Slater, M.W.; Slazyk, I.; Smallwood, J.C.; Smeaton, J.G.; Smetkina, A.; Smith, E.; Smith, M.; 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Vecchi, S.; Velthuis, J.J.; Veltri, M.; Venkateswaran, A.; Veronesi, M.; Vesterinen, M.; Vieira, D.; Vieites Diaz, M.; Viemann, H.; Vilasis-Cardona, X.; Vilella Figueras, E.; Villa, A.; Vincent, P.; Vom Bruch, D.; Vorobyev, A.; Vorobyev, V.; Voropaev, N.; Vos, K.; Waldi, R.; Walsh, J.; Wang, C.; Wang, J.; Wang, J.; Wang, J.; Wang, J.; Wang, M.; Wang, R.; Wang, Y.; Wang, Z.; Wang, Z.; Wark, H.M.; Watson, N.K.; Weber, S.G.; Websdale, D.; Weisser, C.; Westhenry, B.D.C.; White, D.J.; Whitehead, M.; Wiedner, D.; Wilkinson, G.; Wilkinson, M.; Williams, I.; Williams, M.; Williams, M.R.J.; Wilson, F.F.; Wislicki, W.; Witek, M.; Witola, L.; Wormser, G.; Wotton, S.A.; Wu, H.; Wyllie, K.; Xiang, Z.; Xiao, D.; Xie, Y.; Xu, A.; Xu, J.; Xu, L.; Xu, M.; Xu, Q.; Xu, Z.; Xu, Z.; Yang, D.; Yang, S.; Yang, Y.; Yang, Z.; Yang, Z.; Yao, Y.; Yeomans, L.E.; Yin, H.; Yu, J.; Yuan, X.; Yushchenko, O.; Zaffaroni, E.; Zavertyaev, M.; Zdybal, M.; Zenaiev, O.; Zeng, M.; Zhang, D.; Zhang, L.; Zhang, S.; Zhang, S.; Zhang, Y.; Zhang, Y.; Zharkova, A.; Zhelezov, A.; Zheng, Y.; Zhou, X.; Zhou, Y.; Zhu, X.; Zhu, Z.; Zhukov, V.; Zonneveld, J.B.; Zou, Q.; Zucchelli, S.; Zuliani, D.; Zunica, G.

doi:10.1103/PhysRevLett.128.142004

The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy sqrt[s_{NN}]=5 TeV is studied at LHCb as a function of pseudorapidity (η) and transverse momentum (p_{T}) with respect to the proton beam direction. The nuclear modification factor for charged particles is determined as a function of η between -4.8<-2.5 (backward region) and 2.0<4.8 (forward region), and p_{T} between 0.2<8.0 GeV/c. The results show a suppression of charged particle production in proton-lead collisions relative to proton-proton collisions in the forward region and an enhancement in the backward region for p_{T} larger than 1.5 GeV/c. This measurement constrains nuclear PDFs and saturation models at previously unexplored values of the parton momentum fraction down to 10^{-6}.

Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at sNN =5 TeV / R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C.A. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, Z. Aliouche, G. Alkhazov, P. Alvarez Cartelle, S. Amato, J.L. Amey, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J.J. Back, P. Baladron Rodriguez, V. Balagura, W. Baldini, J. Baptista Leite, R.J. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J.M. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H.C. Bernstein, C. Bertella, A. Bertolin, C. Betancourt, F. Betti, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M.S. Bieker, S. Bifani, P. Billoir, M. Birch, F.C.R. Bishop, A. Bitadze, A. Bizzeti, M. Bjørn, M.P. Blago, T. Blake, F. Blanc, S. Blusk, D. Bobulska, J.A. Boelhauve, O. Boente Garcia, T. Boettcher, A. Boldyrev, A. Bondar, N. Bondar, S. Borghi, M. Borisyak, M. Borsato, J.T. Borsuk, S.A. Bouchiba, T.J.V. Bowcock, A. Boyer, C. Bozzi, M.J. Bradley, S. Braun, A. Brea Rodriguez, M. Brodski, J. Brodzicka, A. Brossa Gonzalo, D. Brundu, A. Buonaura, A.T. Burke, C. Burr, A. Bursche, A. Butkevich, J.S. Butter, J. Buytaert, W. Byczynski, S. Cadeddu, H. Cai, R. Calabrese, L. Calefice, L. Calero Diaz, S. Cali, R. Calladine, M. Calvi, M. Calvo Gomez, P. Camargo Magalhaes, P. Campana, A.F. Campoverde Quezada, S. Capelli, L. Capriotti, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, I. Carli, P. Carniti, L. Carus, K. Carvalho Akiba, A. Casais Vidal, G. Casse, M. Cattaneo, G. Cavallero, S. Celani, J. Cerasoli, A.J. Chadwick, M.G. Chapman, M. Charles, P. Charpentier, G. Chatzikonstantinidis, C.A. Chavez Barajas, M. Chefdeville, C. Chen, S. Chen, A. Chernov, V. Chobanova, S. Cholak, M. Chrzaszcz, A. Chubykin, V. Chulikov, P. Ciambrone, M.F. Cicala, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, J.L. Cobbledick, V. Coco, J.A.B. Coelho, J. Cogan, E. Cogneras, L. Cojocariu, P. Collins, T. Colombo, L. Congedo, A. Contu, N. Cooke, G. Coombs, I. Corredoira, G. Corti, C.M. Costa Sobral, B. Couturier, D.C. Craik, J. Crkovská, M. Cruz Torres, R. Currie, C.L. Da Silva, S. Dadabaev, L. Dai, E. Dall'Occo, J. Dalseno, C. D'Ambrosio, A. Danilina, P. D'Argent, J.E. Davies, A. Davis, O. De Aguiar Francisco, K. De Bruyn, S. De Capua, M. De Cian, J.M. De Miranda, L. De Paula, M. De Serio, D. De Simone, P. De Simone, J.A. de Vries, C.T. Dean, D. Decamp, L. Del Buono, B. Delaney, H. Dembinski, A. Dendek, V. Denysenko, D. Derkach, O. Deschamps, F. Desse, F. Dettori, B. Dey, A. Di Cicco, P. Di Nezza, S. Didenko, L. Dieste Maronas, H. Dijkstra, V. Dobishuk, A.M. Donohoe, F. Dordei, A.C. Dos Reis, L. Douglas, A. Dovbnya, A.G. Downes, K. Dreimanis, M.W. Dudek, L. Dufour, V. Duk, P. Durante, J.M. Durham, D. Dutta, A. Dziurda, A. Dzyuba, S. Easo, U. Egede, V. Egorychev, S. Eidelman, S. Eisenhardt, S. Ek-In, L. Eklund, S. Ely, A. Ene, E. Epple, S. Escher, J. Eschle, S. Esen, T. Evans, A. Falabella, J. Fan, Y. Fan, B. Fang, S. Farry, D. Fazzini, M. Féo, A. Fernandez Prieto, A.D. Fernez, F. Ferrari, L. Ferreira Lopes, F. Ferreira Rodrigues, S. Ferreres Sole, M. Ferrillo, M. Ferro-Luzzi, S. Filippov, R.A. Fini, M. Fiorini, M. Firlej, K.M. Fischer, D.S. Fitzgerald, C. Fitzpatrick, T. Fiutowski, A. Fkiaras, F. Fleuret, M. Fontana, F. Fontanelli, R. Forty, V. Franco Lima, M. Franco Sevilla, M. Frank, E. Franzoso, G. Frau, C. Frei, D.A. Friday, J. Fu, Q. Fuehring, W. Funk, E. Gabriel, T. Gaintseva, A. Gallas Torreira, D. Galli, S. Gambetta, Y. Gan, M. Gandelman, P. Gandini, Y. Gao, M. Garau, L.M. 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Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at sNN =5 TeV

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2022

Abstract

The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy sqrt[s_{NN}]=5 TeV is studied at LHCb as a function of pseudorapidity (η) and transverse momentum (p_{T}) with respect to the proton beam direction. The nuclear modification factor for charged particles is determined as a function of η between -4.8<-2.5 (backward region) and 2.0<4.8 (forward region), and p_{T} between 0.2<8.0 GeV/c. The results show a suppression of charged particle production in proton-lead collisions relative to proton-proton collisions in the forward region and an enhancement in the backward region for p_{T} larger than 1.5 GeV/c. This measurement constrains nuclear PDFs and saturation models at previously unexplored values of the parton momentum fraction down to 10^{-6}.

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	Settori scientifico-disciplinari dell'articolo
	
				Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
			
	Data di pubblicazione
	
				8-apr-2022
			
	Rivista in ANCE
	
				PHYSICAL REVIEW LETTERS
			
	DOI
	
				https://dx.doi.org/10.1103/PhysRevLett.128.142004
			
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				01 - Articolo su periodico

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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/929851

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