Review of bottomonium measurements from CMS

Hu, Z.; Leonardo, N.; Liu, Tiehui Ted; Haytmyradov, M.

doi:10.1142/s0217751x17300150

Cited by 16 publications

(16 citation statements)

References 124 publications

(146 reference statements)

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“…Later it was also observed by the STAR Collaboration at RHIC [18]. The Υ(2S) and Υ(3S) resonances in PbPb collisions were seen to be more strongly suppressed than the Υ(1S) (compared with the pp result), showing the expected sequential suppression pattern [16].…”

Section: Introductionmentioning

confidence: 63%

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Υ suppression in a hadron gas

2020

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In this work we study the interactions of bottom mesons which lead to Υ production and absorption in hot hadronic matter. We use effective Lagrangians to calculate the Υ production cross section in processes such asB ( * ) + B ( * ) → Υ + (π, ρ) and also the Υ absorption cross section in the corresponding inverse processes. We update and extend previous calculations by Lin and Ko, introducing anomalous interactions. The obtained cross sections are used as input to solve the rate equation which allows us to follow the time evolution of the Υ multiplicity. In contrast to previous conjectures, our results suggest that the interactions in the hadron gas phase strongly reduce the Υ abundance.

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Section: Introductionmentioning

confidence: 63%

“…The most recent data on prompt J/ψ [19] and Υ [16,[20][21][22] suppression in the most central Pb Pb collisions at small rapidities and small p T , show that:…”

Section: Introductionmentioning

confidence: 99%

Υ suppression in a hadron gas

2020

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“…The LHC experiments have measured Υ production at both ATLAS and CMS [91,92]. In the rapidity range |y| < 2, relevant for MATHUSLA, the cross-section is given by [93] σ…”

Section: B12 Quarkonia and Heavy Flavour Baryonsmentioning

confidence: 99%

Sensitivity of the intensity frontier experiments for neutrino and scalar portals: analytic estimates

Bondarenko

Boyarsky

Ovchynnikov

et al. 2019

J. High Energ. Phys.

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In recent years, a number of intensity frontier experiments have been proposed to search for feebly interacting particles with masses in the GeV range. We discuss how the characteristic shape of the experimental sensitivity regions -upper and lower boundaries of the probed region, the maximal mass reach -depends on the parameters of the experiments. We use the SHiP and the MATHUSLA experiments as examples. We find a good agreement of our estimates with the results of the Monte Carlo simulations. This simple approach allows to cross-check and debug Monte Carlo results, to scan quickly over the parameter space of feebly interacting particle models, and to explore how sensitivity depends on the geometry of experiments.

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“…The bottomonium system plays a special role for an improved understanding of underlying production mechanisms that has been extensively explored in Run1 [16]. With the Run2 data an higher p T region has been probed for S-wave states and enough yields also exist to study P-wave states.…”

Section: Heavy Quark Probesmentioning

confidence: 99%

“…Associated production of heavy flavor with other states provide a complementary view that is also explored, e.g. double quarkonia J/ψ + J/ψ [12] and ϒ(1S) + ϒ(1S) [13], ψ+jets [14], and W + charm [15].The bottomonium system plays a special role for an improved understanding of underlying production mechanisms that has been extensively explored in Run1 [16]. With the Run2 data an higher p T region has been probed for S-wave states and enough yields also exist to study P-wave states.…”

mentioning

confidence: 99%

Heavy quark probes of QCD

Leonardo¹

2019

Proceedings of the 39th International Conference on High Energy Physics — PoS(ICHEP2018)

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on behalf of the CMS CollaborationLarge heavy flavor enriched data sets are being accumulated by the CMS experiment in different collision environments and energies provided by the LHC. These offer robust probes for testing the standard model and potentially reaching beyond it. In this report I concentrate on recent production measurements in proton-proton, ion-ion and proton-ion collisions. These allow to probe the underlying QCD mechanisms of hadron formation and the properties of QCD matter under extreme temperatures. Heavy quark probesNuno Leonardo CMS is a general purpose detector at the LHC [1]. In addition to collecting data at the highest energies, which allow for probing the electroweak and symmetry breaking sector and searching for new heavy particles directly, exploring the energy frontier, the experiment also accumulates sizeable datasets at lower energies, exploring the luminosity frontier. In this regard, and in addition to joining ATLAS in the high-p T front, CMS complements the experiments dedicated to the study of b hadrons, LHCb, and of heavy-ion collisions, ALICE. Owing to robust and flexible tracking, muon, and trigger systems and the ability to efficiently explore the highest LHC luminosities and the different collision systems, CMS is making significant and unique contributions to the heavy flavor (HF) realm. We report briefly on recent HF production results in pp, pPb and PbPb collisions.Hadronic systems involving heavy quarks, b and c, provide a suitable laboratory in which to study Quantum Chromodynamics (QCD). Measurements of differential production cross sections have been performed for S-wave quarkonia [2] and B + mesons [3] with initial Run2 data at 13 TeV, which extend similar measurements that had been performed at 7 TeV. The smaller pp dataset collected at 5 TeV has allowed corresponding measurements of J. Similar results having been performed for the quarkonium states also at 2.76 TeV, these allow a study of the √ s dependence of the production cross sections. The heavier B c meson has also been probed [10]. Polarization measurements have been performed for the Swave quarkonium states at 7 TeV, and also for the Λ b baryon [11]. Associated production of heavy flavor with other states provide a complementary view that is also explored, e.g. double quarkonia J/ψ + J/ψ [12] and ϒ(1S) + ϒ(1S) [13], ψ+jets [14], and W + charm [15].The bottomonium system plays a special role for an improved understanding of underlying production mechanisms that has been extensively explored in Run1 [16]. With the Run2 data an higher p T region has been probed for S-wave states and enough yields also exist to study P-wave states. The χ b,J (3P) triplet (J = 0, 1, 2) is interesting in particular for allowing to infer how its properties are affected by the proximity to the open beauty (BB) threshold. The merged states had been observed by ATLAS [17] earlier in Run1 (the first newly observed state at the LHC). Using an integrated luminosity of 80 f b −1 collected during Run2, CMS has reported the observation...

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Review of bottomonium measurements from CMS

Cited by 16 publications

References 124 publications

Υ suppression in a hadron gas

Υ suppression in a hadron gas

Sensitivity of the intensity frontier experiments for neutrino and scalar portals: analytic estimates

Heavy quark probes of QCD

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