Centrality dependence of ψ(2S) suppression in p-Pb collisions at s N N = 5.02 $$ {\sqrt{s}}_{\mathrm{NN}}=5.02 $$ TeV

Adam, J.; Adamová, D.; Aggarwal, M. M.; Rinella, G. Aglieri; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Aiola, S.; Alme, J.; Helstrup, H.; Hetland, Kristin Fanebust; Altinpinar, S.; Djuvsland, Ø.; Haaland, Ø.; Lønne, Per-Ivar; Nystrand, J.; Rehman, A.; Röhrich, D.; Tambave, Ganesh Jagannath; Ullaland, K.; Velure, A.; Wagner, B.; Zhang, Hui; Zhou, Zhuo; Zhu, H.; Arsene, I. C.; Paul, B.; Dordic, O.; Lindal, S.; Mahmood, S. M.; Milošević, J.; Qvigstad, H.; Richter, Matthias; Røed, K.; Skaali, T. B.; Tveter, Trine Spedstad; Wikne, J.; Zhao, C.; Langoy, R.; Lien, J.; Akindinov, A.; Alam, Sk Noor; Albuquerque, D. S. D.; Aleksandrov, D.; Alessandro, B.; Alexandre, D.; Molina, José Rubén Alfaro

doi:10.1007/jhep06(2016)050

Cited by 37 publications

(34 citation statements)

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“…arXiv:1707.07266v2 [hep-ph] 1 Feb 2018 , is smaller than 0.6, even for P ⊥ as large as 7 GeV at rapidities towards the proton fragmentation region. The ψ(2S)/J/ψ suppression in p+A collisions is also seen by the LHCb Collaboration [30] and in more detailed studies by both the ALICE Collaboration [31] and the PHENIX Collaboration [32]. Key features of the experimental results are (i) the ratio R is nearly flat at 0.6 for forward rapidities even as P ⊥ becomes larger while at backward rapidities, it goes to unity with increasing P ⊥ .…”

Section: Introductionmentioning

confidence: 65%

ψ(2S) versus J/ψ suppression in proton-nucleus collisions from factorization violating soft color exchanges

Venugopalan

Watanabe

et al. 2018

Phys. Rev. C

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We argue that the large suppression of the ψ(2S) inclusive cross-section relative to the J/ψ inclusive cross-section in proton-nucleus (p+A) collisions can be attributed to factorization breaking effects in the formation of quarkonium. These factorization breaking effects arise from soft color exchanges between charm-anticharm pairs undergoing hadronization and comoving partons that are long-lived on time scales of quarkonium formation. We compute the short distance pair production of heavy quarks in the Color Glass Condensate (CGC) effective field theory and employ an improved Color Evaporation Model (ICEM) to describe their hadronization into quarkonium at large distances. The combined CGC+ICEM model provides a quantitative description of J/ψ and ψ(2S) data in proton-proton (p+p) collisions from both RHIC and the LHC. Factorization breaking effects in hadronization, due to additional parton comovers in the nucleus, are introduced heuristically by imposing a cutoff Λ, representing the average momentum kick from soft color exchanges, in the ICEM. Such soft exchanges have no perceptible effect on J/ψ suppression in p+A collisions. In contrast, the interplay of the physics of these soft exchanges at large distances, with the physics of semi-hard rescattering at short distances, causes a significant additional suppression of ψ(2S) yields relative to that of the J/ψ. A good fit of all RHIC and LHC J/ψ and ψ(2S) data, for transverse momenta P ⊥ ≤ 5 GeV in p+p and p+A collisions, is obtained for Λ ∼ 10 MeV. A c c ∼ t t ∼ t c t f · · · FIG. 1: (Color online) Schematic diagram of Onium production in p+A collisions. The red blob represents parton hard scattering at short distances. Vertical gluons represent multiple gluon scattering (with typical net momentum exchange of order Qs, the saturation scale) off the target nucleus, expressed through a lightlike Wilson line. Soft gluon exchange between produced cc pair and comover spectators at larger distances are shown as orange vertical gluons. The three time scales (tt, tc, t f ) discussed in the text are also illustrated in the figure.Recently, the PHENIX Collaboration at RHIC reported on measurements of ψ(2S) production in d+Au collisions with center-of-mass energy √ s N N = 0.2 TeV/nucleon [28]. They found that in rare events corresponding to a large number of collisions, the ψ(2S) yield is significantly suppressed relative to p+p collisions. This suppression is greater than that seen for the J/ψ yield. The observation of ψ(2S) suppression was corroborated by the ALICE Collaboration in p+Pb collisions at √ s N N = 5.02 TeV/nucleon [29]. They found that the suppression parameter for ψ(2S), R ψ(2S) pA

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Section: Introductionmentioning

confidence: 65%

ψ(2S) versus J/ψ suppression in proton-nucleus collisions from factorization violating soft color exchanges

Venugopalan

Watanabe

et al. 2018

Phys. Rev. C

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“…Recently, CNM effects were measured in pPb collisions at the LHC for quarkonium and heavy flavour production [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. The ALICE experiment studied D meson productions in pPb collisions [25,27,31] at √ s NN = 5 TeV in the region −0.96 < y * < 0.04, where y * is the rapidity of the D meson defined in the centre-of-mass system of the colliding nucleons.…”

Section: Jhep10(2017)090mentioning

confidence: 99%

Study of prompt D 0 meson production in pPb collisions at s N N = 5 $$ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5 $$ TeV

Aaij¹,

Adeva²,

Adinolfi³

et al. 2017

J. High Energ. Phys.

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Production of prompt D 0 mesons is studied in proton-lead and lead-proton collisions recorded at the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of 1.58±0.02 nb −1 recorded at a nucleon-nucleon centre-of-mass energy of √ s NN = 5 TeV. Measurements of the differential cross-section, the forward-backward production ratio and the nuclear modification factor are reported using D 0 candidates with transverse momenta less than 10 GeV/c and rapidities in the ranges 1.5 < y * < 4.0 and −5.0 < y * < −2.5 in the nucleon-nucleon centre-of-mass system. Keywords: Charm physics, Heavy Ion Experiments, Heavy-ion collision, Particle and resonance productionArXiv ePrint: 1707.02750Open Access, Copyright CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP 3 .https://doi.org/10.1007/JHEP10(2017)090 JHEP10(2017)090 Conclusion 17The LHCb collaboration 23 IntroductionCharm hadrons produced in hadronic and nuclear collisions are excellent probes to study nuclear matter in extreme conditions. The differential cross-sections of c-quark production in pp or pp collisions have been calculated based on perturbative quantum chromodynamics (QCD) and collinear or k T factorisation [1][2][3][4][5][6]. These phenomenological models [7] are also able to predict the differential cross-section of c-quark production including most of the commonly assumed "cold nuclear matter" (CNM) effects in nuclear collisions, where CNM effects related to the parton flux differences and other effects come into play. Since heavy quarks are produced in hard scattering (with momentum transfer squared Q 2 2m c ) typically at a short time scale, they are ideal to examine hot nuclear matter, the so-called "quark-gluon plasma" (QGP), by studying how they traverse this medium and interact with it right after their formation.These studies require a thorough understanding of the CNM effects, which can be investigated in systems where the formation of QGP is not expected. In addition, a precise quantification of CNM effects would significantly improve the understanding of charmonium and open-charm production by confirming or discarding the possibility that the suppression pattern in the production of quarkonium states, like J/ψ , at the SPS, RHIC and LHC is due to QGP formation [7].The study of CNM effects is best performed in collisions of protons with heavy nuclei like lead, where the most relevant CNM effects, such as nuclear modification of the parton densities [8,9] and in-medium energy loss [10] in initial-and final-state radiation [11,12], -1 - JHEP10(2017)090are more evident. Phenomenologically, collinear parton distributions are often used to describe the nuclear modification of the parton flux in the nucleus. The modification with respect to the free nucleon depends on the parton fractional longitudinal momentum x, Q 2 and the atomic mass number of the nucleus A [13,14]. In the low-x region, down to x ≈ 10 −5 −10 −6 , which is accessible at LHC energies at forward rapidity, a possible onset of gl...

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“…In addition to the initial-state effects discussed above, also final-state effects may be responsible for a modification of heavy-flavor hadron yields and momentum distributions. The presence of significant final-state effects in high-multiplicity p-Pb collisions is suggested by different observations, e.g., the presence of long-range correlations of charged hadrons [32][33][34][35][36], the evolution with multiplicity of the identified-hadron transverse-momentum distributions [37,38], and the suppression of the ψ(2S) production with respect to the J /ψ one [39][40][41]. The correlation measurements can be described by hydrodynamic calculations assuming the formation of a medium with some degree of collectivity (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

D-meson production in p-Pb collisions at sNN=5.02

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

Phys. Rev. C

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We report on measurements of the 1S, 2S and 3S diierential cross sections d 2 =dp T dy jyj0:4 , as well as on the 1S polarization in pp collisions at p s = 1:8 TeV using a sample of 77 3 pb ,1 collected by the Collider Detector at Fermilab. The three resonances were reconstructed through the decay ! + ,. The measured angular distribution of the muons in the 1S rest frame is consistent with unpolarized meson production.

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Centrality dependence of ψ(2S) suppression in p-Pb collisions at s N N = 5.02 $$ {\sqrt{s}}_{\mathrm{NN}}=5.02 $$ TeV

Cited by 37 publications

References 50 publications

ψ(2S) versus J/ψ suppression in proton-nucleus collisions from factorization violating soft color exchanges

ψ(2S) versus J/ψ suppression in proton-nucleus collisions from factorization violating soft color exchanges

Study of prompt D 0 meson production in pPb collisions at s N N = 5 $$ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5 $$ TeV

D-meson production in p-Pb collisions at sNN=5.02

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