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

Acharya, S.; Wikne, J.; Garcia-Solis, E.; Redelbach, A.R.; Suire, C.; Peng, X.; Bruno, G.E.; Vino, G.; Kim, B.; Anuj, C.; de Cuveland, J.; Jahnke, C.; Schiaua, C.; Lippmann, C.; Bodova, T.; Noh, S.; Junique, A.; Windelband, B.; Hulse, C.V.; Augustinus, A.; Sibiriak, Y.; Adler, A.; Szarka, I.; Kurashvili, P.; Kroesen, M.; Bhasin, A.; Pinto, C.; Bartsch, E.; Fabbietti, L.; Serebryakov, D.; Pillot, P.; Chochula, P.; Schmidt, H.R.; Kleiner, M.; Kuhn, C.; Karpechev, E.; Ali, Y.; Kreis, L.; Mhlanga, S.; Sinha, T.; Cheshkov, C.; Ahuja, I.; Lakrathok, A.; Grosa, F.; Castillo Castellanos, J.; Ceballos Sanchez, C.; Kim, E.J.; Storehaug, I.; Jablonski, M.; Glaenzer, A.M. C.; Buthelezi, Z.; Boca, G.; Ivanov, M.; Shangaraev, A.; Shaikh, W.; Klein-Bösing, C.; Bell Hechavarria, A.D. C.; Urioni, M.; Kumar, D.; Rustamov, A.; Huhn, P.; Perrin, S.; Gauger, E.F.; Finogeev, D.; Chizzali, E.S.; Markert, C.; Rakotozafindrabe, A.; Storetvedt, M.M.; Pinsky, L.; Wegrzynek, A.; Xu, R.; Toia, A.; Voloshin, S.A.; Alt, T.; Agrawal, N.; Trogolo, S.; Sputowska, I.; Paić, G.; Flores, A.N.; Miake, Y.; Al-Turany, M.; Ahammed, Z.; Ruggiano, D.; Virgili, T.; Puccio, M.; Grigoryan, S.; Nesbo, S.V.; Mudnic, E.; Aziz, S.; Zhu, J.; Flor, F.; Siddhanta, S.; Loginov, V.; Bratrud, L.; Norman, J.; Alessandro, B.; Russek, P.G.; Dupieux, P.; Kim, M.; Ricci, R.; Larionov, P.; Alizadehvandchali, N.; Tripathy, S.; Pei, H.; Suljic, M.; Sitta, M.; Neagu, A.; Gago, A.M.; Goh, D.J. Q.; Polichtchouk, B.; Røed, K.; Tang, S.; Munhoz, M.G.; Harlenderova, A.; Matuoka, P.F. T.; Snellings, R.J. M.; Zampolli, C.; Quaglia, L.; López Torres, E.; Ulukutlu, B.; Lindenstruth, V.; Kwon, J.Y.; Agnello, M.; Telesca, A.; Villalobos Baillie, O.; Altsybeev, I.; Chujo, T.; Sahoo, S.; Oya, M.; Piano, S.; Skaali, T.B.; Miśkowiec, D.; Karavichev, O.; Jimenez, A.A. P.; Deng, W.; Tkacik, M.; Ivanov, V.; Krivda, M.; Ippolitov, M.; Lim, B.; Poljak, N.; De Caro, A.; Varga, Z.; Wang, D.; Guo, W.; Kharlov, Y.; Caron, R.; Russo, R.; Hannigan, R.; Roy, P.; Frajna, E.; Konig, J.; Lai, Y.S.; Mohanty, A.P.; Zanone, F.; Lautner, L.; Li, X.; Varga-Kofarago, M.; Laudi, E.; Cindolo, F.; Cui, P.; Lopez, J.A.; Kollegger, T.; Hushnud, H.; Mazzilli, M.; Porteboeuf-Houssais, S.; Ramirez, S.A. R.; Kondratyuk, E.; González-Trueba, L.H.; Ullaland, K.; van Weelden, R.J. 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P.; Králik, I.; Tripathy, T.; Vozniuk, N.; Menon, A.S.; Guardiano, G.G.; Klein, J.; Hristov, P.; Bergmann, L.; Cunqueiro, L.; Stan, I.; Rueda, O.V.; Ryabov, Y.; Filova, V.; Masciocchi, S.; Stratmann, P.; Mrnjavac, T.; Boldizsár, L.; Bearden, I.G.; Pachmayer, Y.; Apadula, N.; Del Grande, R.; Sahu, D.; Fan, F.; Espagnon, B.; Kim, D.J.; Bogdanov, A.; Siemiarczuk, T.; van Doremalen, L.V. R.; Rogochaya, E.; Battistini, D.; Boi, S.; Vercellin, E.; Ortiz Velasquez, A.; Luhder, J.R.; Dash, S.; Dönigus, B.; Ogino, M.; Tambave, G.J.; Moravcova, Z.; Nappi, E.; Kirsch, S.; Schmah, A.; Smirnov, N.; Muccifora, V.; Shirinkin, S.; Bhattacharjee, B.; Khan, A.M.; Zhu, Y.; Schicker, R.; Mihaylov, D.L.; Batigne, G.; Mikhaylov, K.; Elia, D.; Antinori, F.; Ristea, C.; Volkel, B.; Planinic, M.; Beattie, C.; Zhigareva, N.; Peresunko, D.; Alici, A.; Baruffaldi, F.; Závada, P.; Pinazza, O.; Rehman, A.; Cuautle, E.; Garcia, J.R. 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M.; Colamaria, F.; Shimomura, M.; Usai, G.L.; Knospe, A.G.; Shigaki, K.; Zardoshti, N.; Isidori, T.; Roy, S.; Cleymans, J.; Mastroserio, A.; Simantathammakul, T.; Cosentino, M.R.; Hillemanns, H.; Torales-Acosta, F.; Yin, Z.; Szabo, A.; Topilskaya, N.; Petrovici, M.; Sitar, B.; Myrcha, J.W.; Ronchetti, F.; Onnerstad, A.; Rohr, D.; Gulbrandsen, K.; Grigoriev, V.; Gay Ducati, M.B.; Liu, D.H.; Sheibani, O.; Antonioli, P.; Pruneau, C.A.; Hippolyte, B.; Conesa del Valle, Z.; La Rocca, P.; Nania, R.; Costa, F.; Mao, Y.; Weber, M.; Sukhanov, M.; Marín, A.; Bailhache, R.; Ehlers, R.J.; Fantoni, A.; Tejeda Muñoz, G.; Wessels, J.P.; Panebianco, S.; Mdhluli, J.E.; Rath, R.; Porter, J.; Berdnikov, Y.; Malik, Q.W.; Tarzila, M.G.; Kluge, A.; Bielčíková, J.; Sakai, S.; Zinovjev, G.; Negru, A.; Schwarz, K.; Durkac, M.; Pagano, D.; Di Mauro, A.; Weyhmiller, S.L.; Mathis, A.M.; Vázquez Doce, O.; Coquet, M.L.; Grelli, A.; Yano, S.; Karavicheva, T.; Tkacik, T.; Menchaca-Rocha, A.; Marquard, M.; Cormier, T.M.; Petrov, V.; Sekiguchi, Y.; Bock, F.; Liu, A.; Kvapil, J.; Dobrin, A.; Lesch, M.M.; Sharma, H.; Saha, S.K.; Sadek, R.; Nath, A.; Dzalaiova, N.; Volpe, G.; Bencedi, G.; Grabski, V.; Manso, F.; Kazantsev, A.; Hou, Y.; Bianchi, L.; Roy, A.; Lien, J.; Rancien, T.A.; Stocco, D.; Funicello, N.; Gupta, R.; Bailung, Y.; Margagliotti, G.V.; Perez, G.M.; Kashyap, V.; Giubilato, P.; Khanzadeev, A.; Foertsch, S.

doi:10.1007/JHEP06(2023)023

Underlying-event properties in pp and p–Pb collisions at $ \sqrt{s_{\textrm{NN}}} $ = 5.02 TeV - Acharya, S. et al - arXiv:2204.10389CERN-EP-2022-041

Illustration of the toward, transverse, and away regions in the azimuthal plane with respect to the leading particle direction. The figure has been taken from Ref.~\cite{ALICE:2019mmy}.

Charged-particle number density as a function of \ptt measured in the transverse region for \pp (left) and \pPb collisions (right) at $\sqrt{s_{\rm NN}}=5.02$\,\TeV. Measurements were performed considering three \pt thresholds for associated charged particles: $\pt >0.15$\,\GeVc, $\pt >0.5$\,\GeVc, and $\pt >1$\,\GeVc. Data are compared with \py and \ep predictions. The coloured boxes and the error bars represent the systematic and statistical uncertainties, respectively.

Charged-particle number density as a function of \ptt measured in \pp (left) and \pPb collisions (right) at $\sqrt{s_{\rm NN}}=5.02$\,\TeV. Measurements were performed considering associated charged particles with $\pt>0.5$\,\GeVc. Results for the toward, transverse, and away regions are displayed. The coloured boxes and the error bars represent the systematic and statistical uncertainties, respectively.

The charged-particle number (left) and summed-$p_{\rm T}$ (right) densities as a function of \ptt in \pp collisions at $\sqrt{s}=5.02$\,\TeV are displayed. Results for the transverse (top), away (middle), and toward (bottom) regions were obtained for the transverse momentum threshold $\pt>0.5$\,\GeV/$c$. The shaded area and the error bars around the data points represent the systematic and statistical uncertainties, respectively. Data are compared with \py/Monash (solid line) and \ep (dashed line) predictions. The data-to-model ratios are displayed in the bottom panel of each plot. The boxes around unity represent the statistical and systematic uncertainties added in quadrature.

The charged-particle number (left) and summed-$p_{\rm T}$ (right) densities as a function of \ptt in \pPb collisions at $\sqrt{s_{\rm NN}}=5.02$\,\TeV are displayed. Results for the transverse (top), away (middle), and toward (bottom) regions were obtained for the transverse momentum threshold $\pt>0.5$\,\GeV/$c$. The shaded area and the error bars around the data points represent the systematic and statistical uncertainties, respectively. Data are compared with \py/Angantyr (solid line) and \ep (dashed line) predictions. The data-to-model ratios are displayed in the bottom panel of each plot. The boxes around unity represent the statistical and systematic uncertainties added in quadrature.

Upper panels: charged-particle number (left) and summed-$p_{\rm T}$ (right) densities as a function of \ptt in \pp (blue) and \pPb (red) collisions at $\sqrt{s_{\rm NN}}=5.02$\,\TeV. Results for data and comparison with models \py (green) and \ep (red) predictions for the away (upper) and toward (bottom) regions, after the subtraction of the charged-particle number (left) and summed-$p_{\rm T}$ (right) densities in the transverse region, are shown. Bottom panels: charged-particle number and summed-$p_{\rm T}$ densities measured in \pp collisions divided by those in \pPb collisions are displayed for both data and models.

Upper: average transverse momentum as a function of \ptt in the toward (left) and away (right) regions measured in \pp and \pPb collisions at $\sqrt{s_{\rm NN}}=5.02$\,\TeV. Results for data and comparison with models \py (green) and \ep (red) predictions are shown. Bottom: average transverse momentum measured in \pp collisions divided by that measured in \pPb collisions. A similar ratio is shown for model predictions.

Left: charged-particle number density in the transverse region as a function of \ptt for pp collisions at $\sqrt{s}= 0.9$, 5.02, 7, and 13\,\TeV~\cite{ALICE:2011ac,ALICE:2019mmy}. A constant function (solid lines) is used to fit the data in the range $5 < \ptt < 10$\,\GeV/$c$. Right: number densities scaled by the plateau values obtained from the fit to compare the shapes. The coloured boxes represent the systematic uncertainties, and vertical error bars indicate statistical uncertainties.

Centre-of-mass energy dependence of the high \ptt plateau value of the charged-particle number density in the transverse region. The ATLAS~\cite{Aad:2010fh,Aad:2014hia,Aaboud:2017fwp}, CDF~\cite{Affolder:2001xt,Aaltonen:2015aoa}, CMS~\cite{Khachatryan:2015jza} and STAR~\cite{Adam:2019xpp} data points were taken from the compilation reported by the STAR collaboration~\cite{Adam:2019xpp}. Error bars represent statistical and systematic uncertainties summed in quadrature. The data are compared with a parametrisation of the form $s^{0.27}+0.14\log(s)$~\cite{Ortiz:2021gcr}.

The charged-particle number (left) and summed-$p_{\rm T}$ (right) densities as a function of \ptt in \pp collision at $\sqrt{s}=5.02$\,\TeV are displayed. Results for the transverse (top), away (middle), and toward (bottom) regions were obtained for the transverse momentum threshold $\pt>0.15$\,GeV/$c$. The shaded area and the error bars around the data points represent the systematic and statistical uncertainties, respectively. Data are compared with \py/Monash (solid line) and \ep (dashed line) predictions. The data-to-model ratios are displayed in the bottom panel of each plot. The boxes around unity represent the statistical and systematic uncertainties added in quadrature.

The charged-particle number (left) and summed-$p_{\rm T}$ (right) densities as a function of \ptt in \pp collision at $\sqrt{s}=5.02$\,\TeV are displayed. Results for the transverse (top), away (middle), and toward (bottom) regions were obtained for the transverse momentum threshold $\pt>1$\,GeV/$c$. The shaded area and the error bars around the data points represent the systematic and statistical uncertainties, respectively. Data are compared with \py/Monash (solid line) and \ep (dashed line) predictions. The data-to-model ratios are displayed in the bottom panel of each plot. The boxes around unity represent the statistical and systematic uncertainties added in quadrature.

The charged-particle number (left) and summed-$p_{\rm T}$ (right) densities as a function of \ptt in \pPb collision at $\sqrt{s_{\rm NN}}=5.02$\,\TeV are displayed. Results for the transverse (top), away (middle), and toward (bottom) regions were obtained for the transverse momentum threshold $\pt>0.15$\,GeV/$c$. The shaded area and the error bars around the data points represent the systematic and statistical uncertainties, respectively. Data are compared with \py/Angantyr (solid line) and \ep (dashed line) predictions. The data-to-model ratios are displayed in the bottom panel of each plot. The boxes around unity represent the statistical and systematic uncertainties added in quadrature.

The charged-particle number (left) and summed-$p_{\rm T}$ (right) densities as a function of \ptt in \pPb collision at $\sqrt{s_{\rm NN}}=5.02$\,\TeV are displayed. Results for the transverse (top), away (middle), and toward (bottom) regions were obtained for the transverse momentum threshold $\pt>1$\,GeV/$c$. The shaded area and the error bars around the data points represent the systematic and statistical uncertainties, respectively. Data are compared with \py/Angantyr (solid line) and \ep (dashed line) predictions. The data-to-model ratios are displayed in the bottom panel of each plot. The boxes around unity represent the statistical and systematic uncertainties added in quadrature.

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