Hadronic resonance production with ALICE at the LHC Sergey Kiselevfor the ALICE Collaboration

2025-05-06 0 0 1.35MB 6 页 10玖币
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Hadronic resonance production with ALICE at the
LHC
Sergey Kiselev∗for the ALICE Collaboration
∗NRC ”Kurchatov Institute”, Moscow, Russia
E-mail: Sergey.Kiselev@cern.ch
Abstract. We present recent results on short-lived hadronic resonances obtained by the
ALICE experiment at LHC energies. Results include system-size and collision-energy evolution
of transverse momentum spectra, yields and ratios of resonance yields to those of longer lived
particles, and nuclear modification factors. The results are compared with model predictions
and measurements at lower energies.
Hadronic resonance production plays an important role both in elementary and in nucleus-
nucleus collisions. In heavy-ion collisions, since the lifetimes of short-lived resonances are
comparable with the lifetime of the late hadronic phase, regeneration and rescattering effects
become important and ratios of yields of resonances relative to those of longer lived particles
can be used to estimate the time interval between the chemical and kinetic freeze-out. The
measurements in pp and p–Pb collisions constitute a reference for nuclear collisions and provide
information for tuning event generators inspired by Quantum Chromodynamics.
Results on short-lived mesonic ρ(770)0, K∗(892)0, K∗(892)±,f0(980), φ(1020) as well as
baryonic Σ(1385)±, Λ(1520) and Ξ(1530)0resonances (hereafter ρ0, K∗0, K∗±,f0,φ, Σ∗±, Λ∗,
Ξ∗0) have been obtained by the ALICE experiment. The resonances are reconstructed in their
hadronic decay channels and have very different lifetimes as shown in Table 1. Here we present
Table 1. Reconstructed decay mode and lifetime values [1] for hadronic resonances.
ρ0K∗0K∗± f0Σ∗± Λ∗Ξ∗0φ
decay channel ππ KπK0
Sπ ππ Λπ pK ΞπKK
lifetime (fm/c) 1.3 4.2 4.2 ∼5 5-5.5 12.6 21.7 46.2
ALICE papers [2] [3]-[12] [13] [14] [15]-[17] [18]-[19] [15]-[16] [3]-[12]
recent results obtained for K∗0and φin p–Pb at √sNN = 8.16 TeV [11], pp and Pb–Pb at 5.02
TeV [10], for K∗± in pp at 5.02, 8, 13 TeV [13] and Pb–Pb at 5.02 TeV, for f0in pp [14] and
p–Pb at 5.02 TeV, for Σ∗± in Pb–Pb at 5.02 TeV [17], for Λ∗in pp at 5.02, 13 TeV and Pb–Pb
at 5.02 TeV.
Figure 1 shows the transverse momentum spectra for Σ∗− in Pb–Pb collisions at
√sN N = 5.02 TeV (left) and ratios of the measured spectra to model predictions (right). The
arXiv:2210.02929v1 [nucl-ex] 6 Oct 2022
0 1 2 3 4 5 6 7 8 9 10
)c (GeV/
T
p
8−
10
7−
10
6−
10
5−
10
4−
10
3−
10
2−
10
1−
10
1
10
-1
)c) (GeV/yd
T
p/(dN
2
) d
ev
N(1/
ALICE
= 5.02 TeV
NN
s
Pb, −Pb
| < 0.5y |
+ cc
-
(1385)Σ
V0M Multiplicity Class
Syst. uncert: total (empty boxes), uncorrelated (shaded boxes)
1/2×
1/5×
10%−0
50%−30
90%−50
Blast-Wave fit
= 5.02 TeV
NN
sPb, −p
= 7 TeVspp,
ALI-PUB-523568
0 1 2 3 4 5 6 7 8 9
1
10
data/model
10%−0
EPOS with UrQMD
EPOS without UrQMD
PYTHIA8/Angantyr
= 5.02 TeV
NN
sPb, −ALICE, Pb
0 1 2 3 4 5 6 7 8 9
1
10
data/model
50%−30 + cc
±
(1385)Σ
0 1 2 3 4 5 6 7 8 9
) c (GeV/
T
p
1
10
data/model
90%−50
ALI-PUB-523573
Figure 1. (color online) Left: Transverse momentum spectra for Σ∗− in different centrality
classes of Pb–Pb collisions at √sN N = 5.02 TeV. Right: Ratios of the measured spectra to
model predictions from PYTHIA8/Angantyr [20] and EPOS [21] with and without the UrQMD
afterburner. From [17].
spectra have been measured for different centralities up to pT= 9 GeV/c. Models do not fully
describe data.
The mean transverse momenta of Λ∗as a function of the charged-particle multiplicity density
are shown in Fig. 2 (left). New data from Pb–Pb collisions at √sN N = 5.02 TeV show larger
values than at √sN N = 2.76 TeV and predictions from the Blast-Wave model. Predictions from
the MUSIC+SMASH model [23], which includes modeling of the hadronic phase, are consistent
with the data in central collisions but underestimate them in peripheral ones. Models without
hadronic afterburner underestimate the measurements at both energies. Figure 2 (right, bottom)
shows the mean transverse momenta of K∗0(c) and φ(d) as a function of the charged-particle
multiplicity density. New data values for p–Pb at √sN N = 8.16 TeV are close to the values
for other light systems. Among the models, EPOS-LHC [24] gives the best agreement with the
data. In pp and p–Pb collisions, the hpTirises faster with multiplicity than in Pb–Pb collisions.
An analogous behavior has been observed in [27] for charged particles and can be understood
as the effect of color reconnection between strings produced in multi-parton interactions.
Normalized pT-integrated yields of K∗0and φas a function of the charged-particle multiplicity
density are presented in Fig. 2 (right, top). New data for p–Pb collisions at √sN N = 8.16 TeV
follow the general trend: yields are independent of collision system and energy and appear to
be driven by the event multiplicity. EPOS-LHC predictions agree with the data.
Figure 3 (left) shows the particle yield ratios K∗±/K0
Sas a function of the charged-particle
multiplicity density. The ratio is significantly suppressed, by about 55%, going from peripheral to
central Pb–Pb collisions. This suppression is consistent with rescattering of K∗± decay products
in the hadronic phase of central collisions as the dominant effect. Models with rescattering effect
(MUSIC+SMASH and HRG-PCE) qualitatively describe the data. There is a hint of decrease
of the ratio with increasing multiplicity in pp collisions. Among the models, EPOS-LHC gives
the best agreement with the data. The K∗± measurement is consistent with previous results
for K∗0[8]. It is worth noting that the systematic uncertainties of charged K∗are smaller than
those of neutral K∗.
The particle yield ratios Λ∗/Λ are illustrated in Fig. 3 (right). The new measurements in
摘要：

HadronicresonanceproductionwithALICEattheLHCSergeyKiselevfortheALICECollaborationNRC"KurchatovInstitute",Moscow,RussiaE-mail:Sergey.Kiselev@cern.chAbstract.Wepresentrecentresultsonshort-livedhadronicresonancesobtainedbytheALICEexperimentatLHCenergies.Resultsincludesystem-sizeandcollision-energyevo...

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