3. Producción
Browse
6 results
Search Results
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Measurement of beauty-quark production in pp collisions at √s = 13 TeV via non-prompt D mesons(Springer Science and Business Media Deutschland GmbH, 2024-10-01)The pT-differential production cross sections of non-prompt D0, D+, and Ds+ mesons originating from beauty-hadron decays are measured in proton–proton collisions at a centre-of-mass energy s = 13 TeV. The measurements are performed at midrapidity, |y| < 0.5, with the data sample collected by ALICE from 2016 to 2018. The results are in agreement with predictions from several perturbative QCD calculations. The fragmentation fraction of beauty quarks to strange mesons divided by the one to non-strange mesons, fs/(fu + fd), is found to be 0.114 ± 0.016 (stat.) ± 0.006 (syst.) ± 0.003 (BR) ± 0.003 (extrap.). This value is compatible with previous measurements at lower centre-of-mass energies and in different collision systems in agreement with the assumption of universality of fragmentation functions. In addition, the dependence of the non-prompt D meson production on the centre-of-mass energy is investigated by comparing the results obtained at s = 5.02 and 13 TeV, showing a hardening of the non-prompt D-meson pT-differential production cross section at higher s. Finally, the bb¯ production cross section per unit of rapidity at midrapidity is calculated from the non-prompt D0, D+, Ds+, and Λc+ hadron measurements, obtaining dσ/dy=75.2±3.2stat.±5.2syst.−3.2+12.3extrap. μb. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Measurement of beauty production via non-prompt charm hadrons in p–Pb collisions at √sNN = 5.02 TeV(Springer Science and Business Media Deutschland GmbH, 2024-11-01)The production cross sections of D0, D+, and Λc+ hadrons originating from beauty-hadron decays (i.e. non-prompt) were measured for the first time at midrapidity in proton–lead (p–Pb) collisions at the center-of-mass energy per nucleon pair of sNN = 5.02 TeV. Nuclear modification factors (RpPb) of non-prompt D0, D+, and Λc+ are calculated as a function of the transverse momentum (pT) to investigate the modification of the momentum spectra measured in p–Pb collisions with respect to those measured in proton–proton (pp) collisions at the same energy. The RpPb measurements are compatible with unity and with the measurements in the prompt charm sector, and do not show a significant pT dependence. The pT-integrated cross sections and pT-integrated RpPb of non-prompt D0 and D+ mesons are also computed by extrapolating the visible cross sections down to pT = 0. The non-prompt D-meson RpPb integrated over pT is compatible with unity and with model calculations implementing modification of the parton distribution functions of nucleons bound in nuclei with respect to free nucleons. The non-prompt Λc+/D0 and D+/D0 production ratios are computed to investigate hadronisation mechanisms of beauty quarks into mesons and baryons. The measured ratios as a function of pT display a similar trend to that measured for charm hadrons in the same collision system. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, ?+ production in pp collisions at s=13 TeV(Springer Science+Business Media, 2026-02-01)The measurement of $$\Sigma ^{+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>?</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> production in pp collisions at $$\sqrt{s}=13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV is presented. The measurement is performed at midrapidity in both minimum-bias and high-multiplicity pp collisions at $$\sqrt{s} =13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV. The $$\Sigma ^{+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>?</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> is reconstructed via its weak-decay topology in the decay channel $$\Sigma ^{+} \rightarrow \mathrm{{p}} + \pi ^{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>?</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>?</mml:mo> <mml:mi>p</mml:mi> <mml:mo>+</mml:mo> <mml:msup> <mml:mi>?</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:mrow> </mml:math> with $$\pi ^{0} \rightarrow \gamma + \gamma .$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>?</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>?</mml:mo> <mml:mi>?</mml:mi> <mml:mo>+</mml:mo> <mml:mi>?</mml:mi> <mml:mo>.</mml:mo> </mml:mrow> </mml:math> In a novel approach, the neutral pion is reconstructed by combining photons that convert in the detector material with photons measured in the calorimeters. The transverse-momentum $$(p_{\textrm{T}})$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> distributions of the $$\Sigma ^{+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>?</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> and its rapidity densities $${\textrm{d}}N$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>d</mml:mtext> <mml:mi>N</mml:mi> </mml:mrow> </mml:math> / $${\textrm{d}}y$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>d</mml:mtext> <mml:mi>y</mml:mi> </mml:mrow> </mml:math> in both event classes are reported. The $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> spectrum in minimum-bias collisions is compared to QCD-inspired event generators. The ratio of $$\Sigma ^{+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>?</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> to previously measured $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>?</mml:mi> </mml:math> baryons is in good agreement with calculations from the Statistical Hadronization Model. The high efficiency and purity of the novel reconstruction method for $$\Sigma ^{+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>?</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> presented here will enable future studies of the interaction of $$\Sigma ^{+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">8 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Medium-induced modification of azimuthal correlations of electrons from heavy-flavor hadron decays with charged particles in Pb–Pb collisions at sNN=5.02 TeV(Springer Science+Business Media, 2026-06-01)The azimuthal-correlation distributions between electrons from the decays of heavy-flavor hadrons and associated charged particles in Pb–Pb collisions at $$\sqrt{s_{\textrm{NN}}} = 5.02$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math> TeV are reported for the 0–10% and 30–50% centrality classes. This measurement provides access to the jet-like correlation observables in the heavy-flavor sector in Pb–Pb collisions. The analysis is performed for trigger electrons from heavy-flavor hadron decays with transverse momentum $$4< p_\textrm{T}^\textrm{e} < 16~\textrm{GeV}/c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>4</mml:mn> <mml:mo><</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> <mml:mtext>e</mml:mtext> </mml:msubsup> <mml:mo><</mml:mo> <mml:mn>16</mml:mn> <mml:mspace/> <mml:mtext>GeV</mml:mtext> <mml:mo>/</mml:mo> <mml:mi>c</mml:mi> </mml:mrow> </mml:math> , considering associated particles within the transverse-momentum range $$1< p_\textrm{T}^\textrm{assoc} < 7$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo><</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> <mml:mtext>assoc</mml:mtext> </mml:msubsup> <mml:mo><</mml:mo> <mml:mn>7</mml:mn> </mml:mrow> </mml:math> $$\textrm{GeV}/c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>GeV</mml:mtext> <mml:mo>/</mml:mo> <mml:mi>c</mml:mi> </mml:mrow> </mml:math> , and a pseudorapidity difference of $$|\Delta \eta |<1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>|</mml:mo> <mml:mi>Δ</mml:mi> <mml:mi>η</mml:mi> <mml:mo>|</mml:mo> <mml:mo><</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> between the trigger electron and associated particles. The per-trigger nuclear modification factor ( $$I_\textrm{AA}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>I</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math> ) is calculated to compare the near- and away-side peak yields to those in pp collisions at $$\sqrt{s} = 5.02$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math> TeV. In 0–10% central collisions, the $$I_\textrm{AA}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>I</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math> indicates a hint of enhancement of associated-particle yields with $$p_\textrm{T}<3$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mo><</mml:mo> <mml:mn>3</mml:mn> </mml:mrow> </mml:math> GeV/ c on the near side, and a suppression of yields with $$p_\textrm{T}>4$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mo>></mml:mo> <mml:mn>4</mml:mn> </mml:mrow> </mml:math> GeV/ c on the away side. The $$I_\textrm{AA}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>I</mml:mi> <mml:mtext>AA</mml:mtext> </mml:msub> </mml:math> for electron triggers from heavy-flavor hadron decays is compared with that for light-flavor and strange-particle triggers to investigate the dependence on different fragmentation processes and parton-medium dynamics, and is found to be the same within uncertainties. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Investigating charm quark energy loss in medium with the nuclear modification factor of D0-tagged jets(Elsevier BV, 2026-04-01)The nuclear modification factor R AA of charm jets, identified by the presence of a D 0 meson among the jet constituents, has been measured for the first time in Pb–Pbcollisions at a centre-of-mass energy per nucleon pair s NN = 5.02 TeV with the ALICE detector at the LHC. The D 0 mesons and their charge conjugates are reconstructed from the hadronic decay D 0 → K − π + . Jets are reconstructed from D 0 -meson candidates and charged particles using the anti- k T algorithm with jet resolution parameter R = 0.3 , in the jet transverse momentum ( p T ) range 5 < p T ch jet < 50 GeV/ c and pseudorapidity | η ch jet | < 0.6. A hint of reduced suppression in the charm-jet R AA is observed in comparison to inclusive jets in central Pb–Pbcollisions with a significance of about 2 σ in 20 < p T ch jet < 50 GeV/ c , suggesting the in-medium energy loss to depend on both the difference between quark and gluon coupling strength (Casimir colour-charge effect) and quark mass (dead-cone effect). The data are compared with model calculations that include mass effects in the in-medium energy loss. Several state-of-the-art models are consistent with the data, with the LIDO model providing the best description of the data in the common kinematic range of inclusive and D 0 -tagged jets, highlighting the role of mass effects in interpreting the results.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Accessing the deuteron source with pion-deuteron femtoscopy in Pb-Pb collisions at (Formula Presented)(American Institute of Physics Inc., 2025-12-12)Femtoscopy of nonidentical particle pairs has been instrumental for precision measurements of both two-particle sources and the final-state interactions in high-energy elementary and heavy-ion collisions. The majority of measurements assessing the source properties are based on identical particle pairs, providing direct access to the characteristics of the single-particle source. The work in this paper demonstrates, via femtoscopy measurements of charged pion-deuteron pairs in Pb-Pb collisions at <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mrow> <a:msqrt> <a:msub> <a:mi>s</a:mi> <a:mi>NN</a:mi> </a:msub> </a:msqrt> <a:mo>=</a:mo> <a:mn>5.02</a:mn> </a:mrow> </a:math> TeV, the feasibility of accessing the characteristics of the single-particle femtoscopic source by using particle pairs with large mass differences such as pions and deuterons. The first experimental results of the measurement of deuteron source sizes in ultrarelativistic heavy-ion collisions are presented. The results show good agreement with the trend derived from other charged hadrons such as pions, kaons, and protons as a function of transverse mass, indicating similar source properties.2