{"title":"Investigating $Λ$ baryon production in p-Pb collisions in jets and underlying event using angular correlations","authors":"ALICE Collaboration","doi":"arxiv-2405.19855","DOIUrl":"https://doi.org/arxiv-2405.19855","url":null,"abstract":"First measurements of hadron(h)$-Lambda$ azimuthal angular correlations in\u0000p$-$Pb collisions at $sqrt{s_{rm NN}}$ = 5.02 TeV using the ALICE detector at\u0000the LHC are presented. These correlations are used to separate the production\u0000of associated $Lambda$ baryons into three different kinematic regions, namely\u0000those produced in the direction of the trigger particle (near-side), those\u0000produced in the opposite direction (away-side), and those whose production is\u0000uncorrelated with the jet-axis (underlying event). The per-trigger associated\u0000$Lambda$ yields in these regions are extracted, along with the near- and\u0000away-side azimuthal peak widths, and the results are studied as a function of\u0000associated particle $p_{rm T}$ and event multiplicity. Comparisons with the\u0000DPMJET event generator and previous measurements of the $phi(1020)$ meson are\u0000also made. The final results indicate that strangeness production in the\u0000highest multiplicity p$-$Pb collisions is enhanced relative to low multiplicity\u0000collisions in the jet-like regions, as well as the underlying event. The\u0000production of $Lambda$ relative to charged hadrons is also enhanced in the\u0000underlying event when compared to the jet-like regions. Additionally, the\u0000results hint that strange quark production in the away-side of the jet is\u0000modified by soft interactions with the underlying event.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Probing strangeness hadronization with event-by-event production of multistrange hadrons","authors":"ALICE Collaboration","doi":"arxiv-2405.19890","DOIUrl":"https://doi.org/arxiv-2405.19890","url":null,"abstract":"This Letter presents the first measurement of event-by-event fluctuations of\u0000the net number (difference between the particle and antiparticle\u0000multiplicities) of multistrange hadrons $Xi^-$ and $overline{Xi}^+$ and its\u0000correlation with the net-kaon number using the data collected by the ALICE\u0000Collaboration in pp, p$-$Pb, and Pb$-$Pb collisions at a center-of-mass energy\u0000per nucleon pair $sqrt{s_{mathrm{NN}}}=5.02 mathrm{TeV}$. The statistical\u0000hadronization model with a correlation over three units of rapidity between\u0000hadrons having the same and opposite strangeness content successfully describes\u0000the results. On the other hand, string-fragmentation models that mainly\u0000correlate strange hadrons with opposite strange quark content over a small\u0000rapidity range fail to describe the data.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Li, D. Verney, G. De Gregorio, R. Mancino, I. Matea, L. Coraggio, N. Itaco., M. N. Harakeh, C. Delafosse, F. Didierjean, L. A. Ayoubi, H. Al Falou, G. Benzoni, F. Le Blanc, V. Bozkurt, M. Ciemała, I. Deloncle, M. Fallot, C. Gaulard, A. Gottardo, V. Guadilla, J. Guillot, K. Hadyńska-Klęk, F. Ibrahim, N. Jovancevic, A. Kankainen, M. Lebois, T. Martínez, P. Napiorkowski, B. Roussiere, Yu. G. Sobolev, I. Stefan, S. Stukalov, D. Thisse, G. Tocabens
{"title":"Simultaneous impacts of nuclear shell structure and collectivity on $β$-decay: evidence from $^{80}$Ga$_{49}$","authors":"R. Li, D. Verney, G. De Gregorio, R. Mancino, I. Matea, L. Coraggio, N. Itaco., M. N. Harakeh, C. Delafosse, F. Didierjean, L. A. Ayoubi, H. Al Falou, G. Benzoni, F. Le Blanc, V. Bozkurt, M. Ciemała, I. Deloncle, M. Fallot, C. Gaulard, A. Gottardo, V. Guadilla, J. Guillot, K. Hadyńska-Klęk, F. Ibrahim, N. Jovancevic, A. Kankainen, M. Lebois, T. Martínez, P. Napiorkowski, B. Roussiere, Yu. G. Sobolev, I. Stefan, S. Stukalov, D. Thisse, G. Tocabens","doi":"arxiv-2405.20490","DOIUrl":"https://doi.org/arxiv-2405.20490","url":null,"abstract":"The Gamow-Teller strength distribution covering the entire $beta$-decay\u0000window, up to 10.312(4) MeV, of $^{80g+m}$Ga was measured for the first time in\u0000photo-fission of UC$_x$ induced by 50 MeV electron beam. The new data show\u0000significant enhancement in the high-energy region with a jump-structure.\u0000Simultaneously, the $gamma$ de-exciting behavior of $beta$-populated states\u0000presents a competition between de-excitation to 2$_1^+$ [$beta_2$ = 0.155(9)]\u0000and to 2$_2^+$ [$beta_2$ = 0.053$_{0.009}^{0.008}$)] in $^{80}$Ge. Based on\u0000these facts and combined with a realistic shell model calculation and\u0000systematic analysis of logft ratio between precursor $beta$-decay to 2$_2^+$\u0000and to 2$_1^+$ of Ga isotopes, we conclude that these phenomena evidence\u0000simultaneous impacts of nuclear shell structure and collectivity on B(GT) and\u0000its distribution and, therefore, the half-life of the precursor. These data\u0000prove that the nucleus as a multi-nucleon correlated quantum system reacts as a\u0000whole when $beta$-decay occurs in contrast to simple single-particle\u0000excitation. Additionally, the comparison with the theoretical results evidence\u0000how challenging is the description of the experimental data obtained, and\u0000render this experimental outcome a sound test for the theoretical models.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Measurement of the production and elliptic flow of (anti)nuclei in Xe-Xe collisions at $sqrt{s_{rm NN}}$ = 5.44 TeV","authors":"ALICE Collaboration","doi":"arxiv-2405.19826","DOIUrl":"https://doi.org/arxiv-2405.19826","url":null,"abstract":"Measurements of (anti)deuteron and (anti)$^3$He production in the rapidity\u0000range $ |y| < $ 0.5 as a function of the transverse momentum and event\u0000multiplicity in Xe$-$Xe collisions at a center-of-mass energy per\u0000nucleon$-$nucleon pair of $sqrt{s_{rm NN}}$ = 5.44 TeV are presented. The\u0000coalescence parameters $B_2$ and $B_3$ are measured as a function of the\u0000transverse momentum per nucleon. The ratios between (anti)deuteron and\u0000(anti)$^3$He yields and those of (anti)protons and pions are reported as a\u0000function of the mean charged-particle multiplicity density, and compared with\u0000two implementations of the statistical hadronization model (SHM) and with\u0000coalescence predictions. The elliptic flow of (anti)deuterons is measured for\u0000the first time in Xe$-$Xe collisions and shows features similar to those\u0000already observed in Pb$-$Pb collisions, i.e., the mass ordering at low\u0000transverse momentum and the meson$-$baryon grouping at intermediate transverse\u0000momentum. The production of nuclei is particularly sensitive to the chemical\u0000freeze-out temperature of the system created in the collision, which is\u0000extracted from a grand-canonical-ensemble-based thermal fit, performed for the\u0000first time including light nuclei along with light-flavor hadrons in Xe$-$Xe\u0000collisions. The extracted chemical freeze-out temperature $T_{rm chem}$ =\u0000(154.2 $pm$ 1.1) MeV in Xe$-$Xe collisions is similar to that observed in\u0000Pb$-$Pb collisions and close to the crossover temperature predicted by lattice\u0000QCD calculations.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"UPC physics with ALICE in Run 3","authors":"Anisa Khatunfor the ALICE Collaboration","doi":"arxiv-2405.19069","DOIUrl":"https://doi.org/arxiv-2405.19069","url":null,"abstract":"The ALICE experiment has undergone a major detector upgrade for Run 3,\u0000expanding its detection capabilities for a wide variety of studies. The new\u0000continuous readout has significantly enhanced the physics potential for\u0000ultra-peripheral collision analyses. In this talk, we discussed some of the\u0000physics analyses that can be carried out in ultra-peripheral collisions using\u0000the Run 3 data and presented some of the first physics performance plots in\u0000both proton-proton and heavy-ion collisions.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Monte-Carlo Study Of Higher-Order Cumulants of Net-Particle Distributions in $p+p$ Collisions at $sqrt{s}$ = 13 TeV","authors":"Abdussamad M, Rahul Verma, Nirbhay Kumar Behera, Sadhana Dash, Basanta Kumar Nandi","doi":"arxiv-2405.16431","DOIUrl":"https://doi.org/arxiv-2405.16431","url":null,"abstract":"Measurement of higher order cumulants of the distributions of conserved\u0000quantities, like net-charge, net-baryon and net-strangeness in heavy-ion\u0000collisions, is proposed as a sensitive tool to determine the freeze-out\u0000parameters and the nature of phase transitions at the LHC energies. Baseline\u0000measurements for heavy-ion collisions are essential to understand the\u0000experimental measurements. Recently, several experimental observations have\u0000shown some QGP-like scenarios in small systems (pp collisions). We report the\u0000first Monte-Carlo study of the measurements of cumulants and their ratios for\u0000net-charge, net-hadron, net-kaon, net-baryon, and net-proton distributions in\u0000pp collisions at $sqrt{s}$=13 TeV using pQCD models like Pythia8 and Herwig.\u0000We also discuss the effect of different particle production mechanisms on the\u0000higher-order cumulants. This simulation study will serve as a baseline for\u0000future measurements at the LHC. Furthermore, it will shed more light on the\u0000measurement of cumulants and the connection between small systems and heavy-ion\u0000collisions at the LHC.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Tano, T. Horai, Y. Ashida, Y. Hino, F. Iacob, A. Maurel, M. Mori, G. Collazuol, A. Konaka, Y. Koshio, T. Nakaya, T. Shima, R. Wendell
{"title":"Measurement of $γ$-rays generated by neutron interaction with ${}^{16}$O at 30 MeV and 250 MeV","authors":"T. Tano, T. Horai, Y. Ashida, Y. Hino, F. Iacob, A. Maurel, M. Mori, G. Collazuol, A. Konaka, Y. Koshio, T. Nakaya, T. Shima, R. Wendell","doi":"arxiv-2405.15366","DOIUrl":"https://doi.org/arxiv-2405.15366","url":null,"abstract":"Deep understanding of $gamma$-ray production from the fast neutron reaction\u0000in water is crucial for various physics studies at large-scale water Cherenkov\u0000detectors. We performed test experiments using quasi-mono energetic neutron\u0000beams ($E_n = 30$ and 250~MeV) at Osaka University's Research Center for\u0000Nuclear Physics to measure $gamma$-rays originating from the neutron-oxygen\u0000reaction with a high-purity germanium detector. Multiple $gamma$-ray peaks\u0000which are expected to be from excited nuclei after the neutron-oxygen reaction\u0000were successfully observed. We measured the neutron beam flux by using a liquid\u0000scintillator for the cross section measurement. With a spectral fitting\u0000analysis based on the tailored $gamma$-ray signal and background templates, we\u0000measured cross sections for each observed $gamma$-ray component. The results\u0000will be useful to validate neutron models employed in the on-going and future\u0000water Cherenkov experiments.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
GERDA Collaboration, M. Agostini, A. Alexander, G. R. Araujo, A. M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, S. Belogurov, A. Bettini, L. Bezrukov, V. Biancacci, E. Bossio, V. Bothe, R. Brugnera, A. Caldwell, S. Calgaro, C. Cattadori, A. Chernogorov, P. -J. Chiu, T. Comellato, V. D'Andrea, E. V. Demidova, N. Di Marco, E. Doroshkevich, M. Fomina, A. Gangapshev, A. Garfagnini, C. Gooch, P. Grabmayr, V. Gurentsov, K. Gusev, J. Hakenmüller, S. Hemmer, W. Hofmann, J. Huang, M. Hult, L. V. Inzhechik, J. Janicskó Csáthy, J. Jochum, M. Junker, V. Kazalov, Y. Kermaïdic, H. Khushbakht, T. Kihm, K. Kilgus, I. V. Kirpichnikov, A. Klimenko, K. T. Knöpfle, O. Kochetov, V. N. Kornoukhov, P. Krause, V. V. Kuzminov, M. Laubenstein, M. Lindner, I. Lippi, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, B. Majorovits, W. Maneschg, G. Marshall, M. Misiaszek, M. Morella, Y. Müller, I. Nemchenok, M. Neuberger, L. Pandola, K. Pelczar, L. Pertoldi, P. Piseri, A. Pullia, C. Ransom, L. Rauscher, M. Redchuk, S. Riboldi, N. Rumyantseva, C. Sada, S. Sailer, F. Salamida, S. Schönert, J. Schreiner, A-K. Schütz, O. Schulz, M. Schwarz, B. Schwingenheuer, O. Selivanenko, E. Shevchik, M. Shirchenko, L. Shtembari, H. Simgen, A. Smolnikov, D. Stukov, S. Sullivan, A. A. Vasenko, A. Veresnikova, C. Vignoli, K. von Sturm, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, B. Zatschler, I. Zhitnikov, S. V. Zhukov, D. Zinatulina, A. Zschocke, K. Zuber, G. Zuzel
{"title":"Searches for new physics below twice the electron mass with GERDA","authors":"GERDA Collaboration, M. Agostini, A. Alexander, G. R. Araujo, A. M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, S. Belogurov, A. Bettini, L. Bezrukov, V. Biancacci, E. Bossio, V. Bothe, R. Brugnera, A. Caldwell, S. Calgaro, C. Cattadori, A. Chernogorov, P. -J. Chiu, T. Comellato, V. D'Andrea, E. V. Demidova, N. Di Marco, E. Doroshkevich, M. Fomina, A. Gangapshev, A. Garfagnini, C. Gooch, P. Grabmayr, V. Gurentsov, K. Gusev, J. Hakenmüller, S. Hemmer, W. Hofmann, J. Huang, M. Hult, L. V. Inzhechik, J. Janicskó Csáthy, J. Jochum, M. Junker, V. Kazalov, Y. Kermaïdic, H. Khushbakht, T. Kihm, K. Kilgus, I. V. Kirpichnikov, A. Klimenko, K. T. Knöpfle, O. Kochetov, V. N. Kornoukhov, P. Krause, V. V. Kuzminov, M. Laubenstein, M. Lindner, I. Lippi, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, B. Majorovits, W. Maneschg, G. Marshall, M. Misiaszek, M. Morella, Y. Müller, I. Nemchenok, M. Neuberger, L. Pandola, K. Pelczar, L. Pertoldi, P. Piseri, A. Pullia, C. Ransom, L. Rauscher, M. Redchuk, S. Riboldi, N. Rumyantseva, C. Sada, S. Sailer, F. Salamida, S. Schönert, J. Schreiner, A-K. Schütz, O. Schulz, M. Schwarz, B. Schwingenheuer, O. Selivanenko, E. Shevchik, M. Shirchenko, L. Shtembari, H. Simgen, A. Smolnikov, D. Stukov, S. Sullivan, A. A. Vasenko, A. Veresnikova, C. Vignoli, K. von Sturm, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, B. Zatschler, I. Zhitnikov, S. V. Zhukov, D. Zinatulina, A. Zschocke, K. Zuber, G. Zuzel","doi":"arxiv-2405.15954","DOIUrl":"https://doi.org/arxiv-2405.15954","url":null,"abstract":"A search for full energy depositions from bosonic keV-scale dark matter\u0000candidates of masses between 65 keV and 1021 keV has been performed with data\u0000collected during Phase II of the GERmanium Detector Array (GERDA) experiment.\u0000Our analysis includes direct dark matter absorption as well as dark Compton\u0000scattering. With a total exposure of 105.5 kg yr, no evidence for a signal\u0000above the background has been observed. The resulting exclusion limits deduced\u0000with either Bayesian or Frequentist statistics are the most stringent direct\u0000constraints in the major part of the 140-1021 keV mass range. As an example, at\u0000a mass of 150 keV the dimensionless coupling of dark photons and axion-like\u0000particles to electrons has been constrained to $alpha$'/$alpha$ <\u00008.7x10$^{-24}$ and g$_{ae}$ < 3.3x10$^{-12}$ at 90% credible interval (CI),\u0000respectively. Additionally, a search for peak-like signals from beyond the\u0000Standard Model decays of nucleons and electrons is performed. We find for the\u0000inclusive decay of a single neutron in $^{76}$Ge a lower lifetime limit of\u0000$tau_n$ > 1.5x10$^{24}$ yr and for a proton $tau_p$ > 1.3x10$^{24}$ yr at 90%\u0000CI. For the electron decay e$^-rightarrownu_egamma$ a lower limit of\u0000$tau_e$ > 5.4x10$^{25}$ yr at 90% CI has been determined.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Measurement of the impact-parameter dependent azimuthal anisotropy in coherent $ρ^0$ photoproduction in Pb$-$Pb collisions at $sqrt{s_{rm NN}}$ = 5.02 TeV","authors":"ALICE Collaboration","doi":"arxiv-2405.14525","DOIUrl":"https://doi.org/arxiv-2405.14525","url":null,"abstract":"The first measurement of the impact-parameter dependent angular anisotropy in\u0000the decay of coherently photoproduced $rho^0$ mesons is presented. The\u0000$rho^0$ mesons are reconstructed through their decay into a pion pair. The\u0000measured anisotropy corresponds to the amplitude of the $cos(2phi)$\u0000modulation, where $phi$ is the angle between the two vectors formed by the sum\u0000and the difference of the transverse momenta of the pions, respectively. The\u0000measurement was performed by the ALICE Collaboration at the LHC using data from\u0000ultraperipheral Pb$-$Pb collisions at a center-of-mass energy of\u0000$sqrt{s_{mathrm{NN}}}~=~5.02$ TeV per nucleon pair. Different\u0000impact-parameter regions are selected by classifying the events in\u0000nuclear-breakup classes. The amplitude of the $cos(2phi)$ modulation is found\u0000to increase by about one order of magnitude from large to small impact\u0000parameters. Theoretical calculations, which describe the measurement, explain\u0000the $cos(2phi)$ anisotropy as the result of a quantum interference effect at\u0000the femtometer scale that arises from the ambiguity as to which of the nuclei\u0000is the source of the photon in the interaction.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141152444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Charm fragmentation fractions and ${rm coverline{c}}$ cross section in p$-$Pb collisions at $sqrt{s_{rm NN}}=5.02$ TeV","authors":"ALICE Collaboration","doi":"arxiv-2405.14571","DOIUrl":"https://doi.org/arxiv-2405.14571","url":null,"abstract":"The total charm-quark production cross section per unit of rapidity\u0000$mathrm{d}sigma({rm coverline{c}})/mathrm{d}y$, and the fragmentation\u0000fractions of charm quarks to different charm-hadron species\u0000$f(mathrm{c}rightarrow {rm h_{c}})$, are measured for the first time in\u0000p$-$Pb collisions at $sqrt{s_mathrm{NN}} = 5.02$ TeV at midrapidity\u0000($-0.96<y<0.04$ in the centre-of-mass frame) using data collected by ALICE at\u0000the CERN LHC. The results are obtained based on all the available measurements\u0000of prompt production of ground-state charm-hadron species: $mathrm{D}^{0}$,\u0000$mathrm{D}^{+}$, $mathrm{D}_mathrm{s}^{+}$, and $mathrm{J/psi}$ mesons,\u0000and $Lambda_mathrm{c}^{+}$ and $Xi_{rm c}^{0}$ baryons. The resulting cross\u0000section is $mathrm{d}sigma({rm coverline{c}})/mathrm{d}y =219.6 pm\u00006.3;(mathrm{stat.}) {;}_{-11.8}^{+10.5};(mathrm{syst.})\u0000{;}_{-2.9}^{+7.6};(mathrm{extr.})pm 5.4;(mathrm{BR})pm\u00004.6;(mathrm{lumi.}) pm 19.5;(text{rapidity shape})+15.0;(Omega_{rm\u0000c}^{0})$ mb, which is consistent with a binary scaling of pQCD calculations\u0000from pp collisions. The measured fragmentation fractions are compatible with\u0000those measured in pp collisions at $sqrt{s} = 5.02$ and $13$ TeV, showing an\u0000increase in the relative production rates of charm baryons with respect to\u0000charm mesons in pp and p$-$Pb collisions compared with $mathrm{e^{+}e^{-}}$\u0000and $mathrm{e^{-}p}$ collisions. The $p_mathrm{T}$-integrated nuclear\u0000modification factor of charm quarks, $R_mathrm{pPb}({rm coverline{c}})= 0.91\u0000pm 0.04;{rm (stat.)}{}^{+0.08}_{-0.09};{rm\u0000(syst.)}{}^{+0.04}_{-0.03};{rm (extr.)}{}pm 0.03;{rm (lumi.)}$, is found\u0000to be consistent with unity and with theoretical predictions including nuclear\u0000modifications of the parton distribution functions.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141152336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}