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  1. Free, publicly-accessible full text available November 1, 2024
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  5. A<sc>bstract</sc>

    The production yields of the Σ(1385)±and Ξ(1530)0resonances are measured in pp collisions at$$ \sqrt{s} $$s= 13 TeV with ALICE. The measurements are performed as a function of the charged-particle multiplicity ⟨dNch/dη⟩, which is related to the energy density produced in the collision. The results include transverse momentum (pT) distributions,pT-integrated yields, mean transverse momenta of Σ(1385)±and Ξ(1530)0, as well as ratios of thepT-integrated resonance yields relative to yields of other hadron species. The Σ(1385)±±and Ξ(1530)0±yield ratios are consistent with the trend of the enhancement of strangeness production from low to high multiplicity pp collisions, which was previously observed for strange and multi-strange baryons. The yield ratio between the measured resonances and the long-lived baryons with the same strangeness content exhibits a hint of a mild increasing trend at low multiplicity, despite too large uncertainties to exclude the flat behaviour. The results are compared with predictions from models such as EPOS-LHC and PYTHIA 8 with Rope shoving. The latter provides the best description of the multiplicity dependence of the Σ(1385)±and Ξ(1530)0production in pp collisions at$$ \sqrt{s} $$s= 13 TeV.

     
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    Free, publicly-accessible full text available May 1, 2025
  6. A<sc>bstract</sc>

    Measurements of inclusive charged-particle jet production in pp and p-Pb collisions at center-of-mass energy per nucleon-nucleon collision$$ \sqrt{s_{\textrm{NN}}} $$sNN= 5.02 TeV and the corresponding nuclear modification factor$$ {R}_{\textrm{pPb}}^{\textrm{ch}\ \textrm{jet}} $$RpPbchjetare presented, using data collected with the ALICE detector at the LHC. Jets are reconstructed in the central rapidity region |ηjet|<0.5 from charged particles using the anti-kTalgorithm with resolution parametersR= 0.2, 0.3, and 0.4. ThepT-differential inclusive production cross section of charged-particle jets, as well as the corresponding cross section ratios, are reported for pp and p-Pb collisions in the transverse momentum range 10<$$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$pT,jetch<140 GeV/cand 10<$$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$pT,jetch<160 GeV/c, respectively, together with the nuclear modification factor$$ {R}_{\textrm{pPb}}^{\textrm{ch}\ \textrm{jet}} $$RpPbchjetin the range 10<$$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$pT,jetch<140 GeV/c. The analysis extends thepTrange of the previously-reported charged-particle jet measurements by the ALICE Collaboration. The nuclear modification factor is found to be consistent with one and independent of the jet resolution parameter with the improved precision of this study, indicating that the possible influence of cold nuclear matter effects on the production cross section of charged-particle jets in p-Pb collisions at$$ \sqrt{s_{\textrm{NN}}} $$sNN= 5.02 TeV is smaller than the current precision. The obtained results are in agreement with other minimum bias jet measurements available for RHIC and LHC energies, and are well reproduced by the NLO perturbative QCD Powhegcalculations with parton shower provided by Pythia8 as well as by Jetscapesimulations.

     
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    Free, publicly-accessible full text available May 1, 2025
  7. K+Kpairs may be produced in photonuclear collisions, either from the decays of photoproducedϕ(1020)mesons or directly as nonresonantK+Kpairs. Measurements ofK+Kphotoproduction probe the couplings between theϕ(1020)and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere. We present the first measurement of coherent photoproduction ofK+Kpairs on lead ions in ultraperipheral collisions using the ALICE detector, including the first investigation of directK+Kproduction. There is significantK+Kproduction at low transverse momentum, consistent with coherent photoproduction on lead targets. In the mass range1.1<MKK<1.4GeV/c2above theϕ(1020)resonance, for rapidity|yKK|<0.8andpT,KK<0.1GeV/c, the measured coherent photoproduction cross section isdσ/dy=3.37±0.61(stat)±0.15(syst)mb. The center-of-mass energy per nucleon of the photon-nucleus (Pb) systemWγPb,nranges from 33 to 188 GeV, far higher than previous measurements on heavy-nucleus targets. The cross section is larger than expected forϕ(1020)photoproduction alone. The mass spectrum is fit to a cocktail consisting ofϕ(1020)decays, directK+Kphotoproduction, and interference between the two. The confidence regions for the amplitude and relative phase angle for directK+Kphotoproduction are presented.

    <supplementary-material><permissions><copyright-statement>© 2024 CERN, for the ALICE Collaboration</copyright-statement><copyright-year>2024</copyright-year><copyright-holder>CERN</copyright-holder></permissions></supplementary-material></sec> </div> <a href='#' class='show open-abstract' style='margin-left:10px;'>more »</a> <a href='#' class='hide close-abstract' style='margin-left:10px;'>« less</a> <div class="actions" style="padding-left:10px;"> <span class="reader-count"> Free, publicly-accessible full text available May 1, 2025</span> </div> </div><div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemscope itemtype="http://schema.org/TechArticle"> <div class="item-info"> <div class="title"> <a href="https://par.nsf.gov/biblio/10514233-light-flavor-particle-production-high-multiplicity-pp-collisions-sqrt-textrm-tev-function-transverse-spherocity" itemprop="url"> <span class='span-link' itemprop="name">Light-flavor particle production in high-multiplicity pp collisions at $$ \sqrt{\textrm{s}} $$ = 13 TeV as a function of transverse spherocity</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1007/JHEP05(2024)184" target="_blank" title="Link to document DOI">https://doi.org/10.1007/JHEP05(2024)184  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Acharya, S</span> <span class="sep">; </span><span class="author" itemprop="author">Adamová, D</span> <span class="sep">; </span><span class="author" itemprop="author">Aglieri_Rinella, G</span> <span class="sep">; </span><span class="author" itemprop="author">Agnello, M</span> <span class="sep">; </span><span class="author" itemprop="author">Agrawal, N</span> <span class="sep">; </span><span class="author" itemprop="author">Ahammed, Z</span> <span class="sep">; </span><span class="author" itemprop="author">Ahmad, S</span> <span class="sep">; </span><span class="author" itemprop="author">Ahn, S U</span> <span class="sep">; </span><span class="author" itemprop="author">Ahuja, I</span> <span class="sep">; </span><span class="author" itemprop="author">Akindinov, A</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2024-05-01">May 2024</time> , Journal of High Energy Physics) </span> </div> <div style="cursor: pointer;-webkit-line-clamp: 5;" class="abstract" itemprop="description"> <title>A<sc>bstract</sc>

    Results on the transverse spherocity dependence of light-flavor particle production (π, K, p,ϕ, K*0,$$ {\textrm{K}}_{\textrm{S}}^0 $$KS0, Λ, Ξ) at midrapidity in high-multiplicity pp collisions at$$ \sqrt{s} $$s= 13 TeV were obtained with the ALICE apparatus. The transverse spherocity estimator$$ \left({S}_{\textrm{O}}^{p_{\textrm{T}}=1}\right) $$SOpT=1categorizes events by their azimuthal topology. Utilizing narrow selections on$$ {S}_{\textrm{O}}^{p_{\textrm{T}}=1} $$SOpT=1, it is possible to contrast particle production in collisions dominated by many soft initial interactions with that observed in collisions dominated by one or more hard scatterings. Results are reported for two multiplicity estimators covering different pseudorapidity regions. The$$ {S}_{\textrm{O}}^{p_{\textrm{T}}=1} $$SOpT=1estimator is found to effectively constrain the hardness of the events when the midrapidity (|η| < 0.8) estimator is used.

    The production rates of strange particles are found to be slightly higher for soft isotropic topologies, and severely suppressed in hard jet-like topologies. These effects are more pronounced for hadrons with larger mass and strangeness content, and observed when the topological selection is done within a narrow multiplicity interval. This demonstrates that an important aspect of the universal scaling of strangeness enhancement with final-state multiplicity is that high-multiplicity collisions are dominated by soft, isotropic processes. On the contrary, strangeness production in events with jet-like processes is significantly reduced.

    The results presented in this article are compared with several QCD-inspired Monte Carlo event generators. Models that incorporate a two-component phenomenology, either through mechanisms accounting for string density, or thermal production, are able to describe the observed strangeness enhancement as a function of$$ {S}_{\textrm{O}}^{p_{\textrm{T}}=1} $$SOpT=1.

     
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    Free, publicly-accessible full text available May 1, 2025
  8. A<sc>bstract</sc>

    The ALICE Collaboration reports a search for jet quenching effects in high-multiplicity (HM) proton-proton collisions at$$ \sqrt{s} $$s= 13 TeV, using the semi-inclusive azimuthal-difference distribution ∆φof charged-particle jets recoiling from a high transverse momentum (high-pT,trig) trigger hadron. Jet quenching may broaden the ∆φdistribution measured in HM events compared to that in minimum bias (MB) events. The measurement employs apT,trig-differential observable for data-driven suppression of the contribution of multiple partonic interactions, which is the dominant background. While azimuthal broadening is indeed observed in HM compared to MB events, similar broadening for HM events is observed for simulations based on the PYTHIA 8 Monte Carlo generator, which does not incorporate jet quenching. Detailed analysis of these data and simulations show that the azimuthal broadening is due to bias of the HM selection towards events with multiple jets in the final state. The identification of this bias has implications for all jet quenching searches where selection is made on the event activity.

     
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    Free, publicly-accessible full text available May 1, 2025