Underlying-event properties in pp and p–Pb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV

Author:

,Acharya S.,Adamová D.,Adler A.,Aglieri Rinella G.,Agnello M.,Agrawal N.,Ahammed Z.,Ahmad S.,Ahn S. U.,Ahuja I.,Akindinov A.,Al-Turany M.,Aleksandrov D.,Alessandro B.,Alfanda H. M.,Alfaro Molina R.,Ali B.,Ali Y.,Alici A.,Alizadehvandchali N.,Alkin A.,Alme J.,Alocco G.,Alt T.,Altsybeev I.,Anaam M. N.,Andrei C.,Andronic A.,Anguelov V.,Antinori F.,Antonioli P.,Anuj C.,Apadula N.,Aphecetche L.,Appelshäuser H.,Arcelli S.,Arnaldi R.,Arsene I. C.,Arslandok M.,Augustinus A.,Averbeck R.,Aziz S.,Azmi M. D.,Badalà A.,Baek Y. W.,Bai X.,Bailhache R.,Bailung Y.,Bala R.,Balbino A.,Baldisseri A.,Balis B.,Banerjee D.,Banoo Z.,Barbera R.,Barioglio L.,Barlou M.,Barnaföldi G. G.,Barnby L. S.,Barret V.,Barreto L.,Bartels C.,Barth K.,Bartsch E.,Baruffaldi F.,Bastid N.,Basu S.,Batigne G.,Battistini D.,Batyunya B.,Bauri D.,Bazo Alba J. L.,Bearden I. G.,Beattie C.,Becht P.,Behera D.,Belikov I.,Bell Hechavarria A. D. C.,Bellwied R.,Belokurova S.,Belyaev V.,Bencedi G.,Beole S.,Bercuci A.,Berdnikov Y.,Berdnikova A.,Bergmann L.,Besoiu M. G.,Betev L.,Bhaduri P. P.,Bhasin A.,Bhat I. R.,Bhat M. A.,Bhattacharjee B.,Bianchi L.,Bianchi N.,Bielčík J.,Bielčíková J.,Biernat J.,Bilandzic A.,Biro G.,Biswas S.,Blair J. T.,Blau D.,Blidaru M. B.,Bluhme N.,Blume C.,Boca G.,Bock F.,Bodova T.,Bogdanov A.,Boi S.,Bok J.,Boldizsár L.,Bolozdynya A.,Bombara M.,Bond P. M.,Bonomi G.,Borel H.,Borissov A.,Bossi H.,Botta E.,Bratrud L.,Braun-Munzinger P.,Bregant M.,Broz M.,Bruno G. E.,Buckland M. D.,Budnikov D.,Buesching H.,Bufalino S.,Bugnon O.,Buhler P.,Buthelezi Z.,Butt J. B.,Bylinkin A.,Bysiak S. A.,Cai M.,Caines H.,Caliva A.,Calvo Villar E.,Camacho J. M. M.,Camacho R. S.,Camerini P.,Canedo F. D. M.,Carabas M.,Carnesecchi F.,Caron R.,Castillo Castellanos J.,Catalano F.,Ceballos Sanchez C.,Chakaberia I.,Chakraborty P.,Chandra S.,Chapeland S.,Chartier M.,Chattopadhyay S.,Chattopadhyay S.,Chavez T. G.,Cheng T.,Cheshkov C.,Cheynis B.,Chibante Barroso V.,Chinellato D. D.,Chizzali E. S.,Cho S.,Chochula P.,Christakoglou P.,Christensen C. H.,Christiansen P.,Chujo T.,Ciacco M.,Cicalo C.,Cifarelli L.,Cindolo F.,Ciupek M. R.,Clai G.,Cleymans J.,Colamaria F.,Colburn J. S.,Colella D.,Collu A.,Colocci M.,Concas M.,Conesa Balbastre G.,Conesa del Valle Z.,Contin G.,Contreras J. G.,Coquet M. L.,Cormier T. M.,Cortese P.,Cosentino M. R.,Costa F.,Costanza S.,Crochet P.,Cruz-Torres R.,Cuautle E.,Cui P.,Cunqueiro L.,Dainese A.,Danisch M. C.,Danu A.,Das P.,Das P.,Das S.,Dash S.,De Caro A.,de Cataldo G.,De Cilladi L.,de Cuveland J.,De Falco A.,De Gruttola D.,De Marco N.,De Martin C.,De Pasquale S.,Deb S.,Degenhardt H. F.,Deja K. R.,Del Grande R.,Dello Stritto L.,Deng W.,Dhankher P.,Di Bari D.,Di Mauro A.,Diaz R. A.,Dietel T.,Ding Y.,Divià R.,Dixit D. U.,Djuvsland Ø.,Dmitrieva U.,Dobrin A.,Dönigus B.,Dubey A. K.,Dubinski J. M.,Dubla A.,Dudi S.,Dupieux P.,Durkac M.,Dzalaiova N.,Eder T. M.,Ehlers R. J.,Eikeland V. N.,Eisenhut F.,Elia D.,Erazmus B.,Ercolessi F.,Erhardt F.,Erokhin A.,Ersdal M. R.,Espagnon B.,Eulisse G.,Evans D.,Evdokimov S.,Fabbietti L.,Faggin M.,Faivre J.,Fan F.,Fan W.,Fantoni A.,Fasel M.,Fecchio P.,Feliciello A.,Feofilov G.,Fernández Téllez A.,Ferrer M. B.,Ferrero A.,Ferretti A.,Feuillard V. J. G.,Figiel J.,Filova V.,Finogeev D.,Fiorenza G.,Flor F.,Flores A. N.,Foertsch S.,Fokin I.,Fokin S.,Fragiacomo E.,Frajna E.,Fuchs U.,Funicello N.,Furget C.,Furs A.,Gaardhøje J. J.,Gagliardi M.,Gago A. M.,Gal A.,Galvan C. D.,Ganoti P.,Garabatos C.,Garcia J. R. A.,Garcia-Solis E.,Garg K.,Gargiulo C.,Garibli A.,Garner K.,Gauger E. F.,Gautam A.,Gay Ducati M. B.,Germain M.,Ghosh S. K.,Giacalone M.,Gianotti P.,Giubellino P.,Giubilato P.,Glaenzer A. M. C.,Glässel P.,Glimos E.,Goh D. J. Q.,Gonzalez V.,González-Trueba L. H.,Gorbunov S.,Gorgon M.,Görlich L.,Gotovac S.,Grabski V.,Graczykowski L. K.,Grecka E.,Greiner L.,Grelli A.,Grigoras C.,Grigoriev V.,Grigoryan S.,Grosa F.,Grosse-Oetringhaus J. F.,Grosso R.,Grund D.,Guardiano G. G.,Guernane R.,Guilbaud M.,Gulbrandsen K.,Gunji T.,Guo W.,Gupta A.,Gupta R.,Guzman S. P.,Gyulai L.,Habib M. K.,Hadjidakis C.,Hamagaki H.,Hamid M.,Han Y.,Hannigan R.,Haque M. R.,Harlenderova A.,Harris J. W.,Harton A.,Hasenbichler J. A.,Hassan H.,Hatzifotiadou D.,Hauer P.,Havener L. B.,Heckel S. T.,Hellbär E.,Helstrup H.,Herman T.,Herrera Corral G.,Herrmann F.,Hetland K. F.,Heybeck B.,Hillemanns H.,Hills C.,Hippolyte B.,Hofman B.,Hohlweger B.,Honermann J.,Hong G. H.,Horak D.,Horzyk A.,Hosokawa R.,Hou Y.,Hristov P.,Hughes C.,Huhn P.,Huhta L. M.,Hulse C. V.,Humanic T. J.,Hushnud H.,Hutson A.,Hutter D.,Iddon J. P.,Ilkaev R.,Ilyas H.,Inaba M.,Innocenti G. M.,Ippolitov M.,Isakov A.,Isidori T.,Islam M. S.,Ivanov M.,Ivanov V.,Izucheev V.,Jablonski M.,Jacak B.,Jacazio N.,Jacobs P. M.,Jadlovska S.,Jadlovsky J.,Jaffe L.,Jahnke C.,Janik M. A.,Janson T.,Jercic M.,Jevons O.,Jimenez A. A. P.,Jonas F.,Jones P. G.,Jowett J. M.,Jung J.,Jung M.,Junique A.,Jusko A.,Kabus M. J.,Kaewjai J.,Kalinak P.,Kalteyer A. S.,Kalweit A.,Kaplin V.,Karasu Uysal A.,Karatovic D.,Karavichev O.,Karavicheva T.,Karczmarczyk P.,Karpechev E.,Kashyap V.,Kazantsev A.,Kebschull U.,Keidel R.,Keijdener D. L. D.,Keil M.,Ketzer B.,Khan A. M.,Khan S.,Khanzadeev A.,Kharlov Y.,Khatun A.,Khuntia A.,Kileng B.,Kim B.,Kim C.,Kim D. J.,Kim E. J.,Kim J.,Kim J. S.,Kim J.,Kim J.,Kim M.,Kim S.,Kim T.,Kirsch S.,Kisel I.,Kiselev S.,Kisiel A.,Kitowski J. P.,Klay J. L.,Klein J.,Klein S.,Klein-Bösing C.,Kleiner M.,Klemenz T.,Kluge A.,Knospe A. G.,Kobdaj C.,Kollegger T.,Kondratyev A.,Kondratyeva N.,Kondratyuk E.,Konig J.,Konigstorfer S. A.,Konopka P. J.,Kornakov G.,Koryciak S. D.,Kotliarov A.,Kovalenko O.,Kovalenko V.,Kowalski M.,Králik I.,Kravčáková A.,Kreis L.,Krivda M.,Krizek F.,Krizkova Gajdosova K.,Kroesen M.,Krüger M.,Krupova D. 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Abstract

Abstract We report about the properties of the underlying event measured with ALICE at the LHC in pp and p–Pb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ s NN = 5.02 TeV. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading-particle transverse momentum $$ \left({p}_{\textrm{T}}^{\textrm{trig}}\right) $$ p T trig . These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different pT thresholds (0.15, 0.5 and 1 GeV/c) at mid-pseudorapidity (|η| < 0.8). The event activity in the transverse region, which is the most sensitive to the underlying event, exhibits similar behaviour in both pp and p–Pb collisions, namely, a steep increase with $$ {p}_{\textrm{T}}^{\textrm{trig}} $$ p T trig for low $$ {p}_{\textrm{T}}^{\textrm{trig}} $$ p T trig , followed by a saturation at $$ {p}_{\textrm{T}}^{\textrm{trig}}\approx 5 $$ p T trig 5 GeV/c. The results from pp collisions are compared with existing measurements at other centre-of-mass energies. The quantities in the toward and away regions are also analyzed after the subtraction of the contribution measured in the transverse region. The remaining jet-like particle densities are consistent in pp and p–Pb collisions for $$ {p}_{\textrm{T}}^{\textrm{trig}}>10 $$ p T trig > 10 GeV/c, whereas for lower $$ {p}_{\textrm{T}}^{\textrm{trig}} $$ p T trig values the event activity is slightly higher in p–Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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