An updated study of ϒ production and polarization at the Tevatron and LHC

Feng, Yu; Gong, Bin; Wan, Lu-Ping; Wang, Jianxiong

doi:10.1088/1674-1137/39/12/123102

Cited by 49 publications

(102 citation statements)

References 45 publications

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“…The corresponding values are listed in tables 2-4. By integrating the double-differential results over p T (y), the differential cross-sections times dimuon branching fractions as functions of y (p T ) are shown in figure 3 for the three Υ states, with the theoretical predictions based on NRQCD [24] overlaid. The NRQCD predictions are in agreement with the experimental data at high p T .…”

Section: Cross-sectionsmentioning

confidence: 99%

“…Statistical and systematic uncertainties are added in quadrature. Predictions from NRQCD [24] for the Υ (1S) (black grid shading), Υ (2S) (red grid shading) and Υ (3S) (blue grid shading) states are overlaid in the top plot.…”

Section: Jhep07(2018)134mentioning

confidence: 99%

“…Ratios between the crosssection measurements at 13 TeV and 8 TeV [18] are also presented. The measurements are compared with theoretical predictions based on NRQCD [24]. …”

mentioning

confidence: 99%

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Measurement of ϒ production in pp collisions at $$ \sqrt{s}=13 $$ TeV

Aaij

Adeva

Adinolfi

et al. 2018

J. High Energ. Phys.

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Abstract:The production cross-sections of Υ (1S), Υ (2S) and Υ (3S) mesons in protonproton collisions at √ s = 13 TeV are measured with a data sample corresponding to an integrated luminosity of 277 ± 11 pb −1 recorded by the LHCb experiment in 2015. The Υ mesons are reconstructed in the decay mode Υ → µ + µ − . The differential production cross-sections times the dimuon branching fractions are measured as a function of the Υ transverse momentum, p T , and rapidity, y, over the range 0 < p T < 30 GeV/c and 2.0 < y < 4.5. The ratios of the cross-sections with respect to the LHCb measurement at √ s = 8 TeV are also determined. The measurements are compared with theoretical predictions based on NRQCD. The LHCb collaboration 22 IntroductionThe study of heavy quarkonium (cc and bb) production in high-energy hadron collisions provides important information to better understand quantum chromodynamics (QCD). Thanks to theoretical and experimental efforts in the past forty years, the comprehension of hadronic production of heavy quarkonia has been improved significantly. The production of heavy quarkonium in proton-proton (pp) collisions at the Large Hadron Collider (LHC) is expected to start with the production of a heavy quark pair, QQ, followed by its hadronization into a bound state. The heavy quark pair QQ is produced mainly via Leading Order (LO) gluon-gluon interactions. Several models have been proposed to describe the underlying dynamics, such as the colour-singlet model (CSM) [1][2][3][4][5][6][7] and non-relativistic QCD (NRQCD) [8][9][10]. In the CSM the intermediate QQ state is supposed to be colourless and has the same quantum numbers as the quarkonium final state, while in NRQCD the calculations also include the colour-octet contribution. However, at present no model can describe both the heavy quarkonium production cross-section and polarisation simultaneously. The production of Υ (1S), Υ (2S) and Υ (3S) mesons has been studied at LHC by ATLAS [11,12] and CMS [13, 14] collaborations at centre-of-mass energies of 7 TeV and 13 TeV. The measurements have also been performed by LHCb at centre-of-mass energies of 2.76 TeV [15],[7][8][9][10][11][12][13][14][15][16][17][18][19] and 8 TeV [17][18][19][20]. The NRQCD calculations can describe the trends of the differential production cross-sections in data for all three Υ states within uncertainties. The measured production cross-section ratios between 7 TeV and 8 TeV [18] as a function of transverse momentum, p T , are consistently higher than the next-to-leading -1 - JHEP07(2018)134order NRQCD theory predictions [21], and the ratios as a function of rapidity show a different trend than the predictions [22,23]. The measurement performed at 13 TeV presented here provides valuable input to study the quarkonium production at a higher centre-of-mass energy, enabling ratios to be determined with respect to data taken at a lower centre-ofmass energy. Most of the theoretical and experimental uncertainties cancel in the ratios, and more stringent constraints on the th...

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Section: Cross-sectionsmentioning

confidence: 99%

Section: Jhep07(2018)134mentioning

confidence: 99%

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Measurement of ϒ production in pp collisions at $$ \sqrt{s}=13 $$ TeV

Aaij

Adeva

Adinolfi

et al. 2018

J. High Energ. Phys.

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show abstract

“…The larger mass, higher scale and lower velocity could make the Υ a better candidate for an accurate description by NRQCD. In addition, since there are more Υ states, there are more color octet LDMEs available for fitting, allowing a description of the p T -dependent yields and the polarization simultaneously [33,[51][52][53][54].…”

Section: Quarkonium Productionmentioning

confidence: 99%

Challenges in Heavy Flavor and Quarkonium Production inp + pCollisions at the LHC

Vogt

2017

EPJ Web Conf.

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“…On the side of theory the maturation of effective field theory frameworks, such as NRQCD [17], systematically derived from Quantum Chromo Dynamics (QCD), have made it possible to compute many of the properties of heavy quarkonium in concert either with perturbation theory or lattice QCD simulations. And indeed both the J/Ψ polarization puzzle at Tevatron [18][19][20] and the challenges associated with reproducing polarization effects in hadroproduction of Υ states at LHC have revealed that a thorough understanding of finite angular momentum bound states in vacuum is essential for charmonium [21,22] as well as bottomonium [23,24]. The experimental studies showed on the one hand that the feed-down from χ b (3P ) to Υ(3S), formerly disregarded in theory, can be sizable, while on the other hand the theory computations themselves concluded that e.g.…”

Section: Introductionmentioning

confidence: 99%

In-medium P-wave quarkonium from the complex lattice QCD potential

Burnier¹,

Kaczmarek²,

Rothkopf³

2016

J. High Energ. Phys.

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We extend our lattice QCD potential based study [1] of the in-medium properties of heavy quark bound states to P-wave bottomonium and charmonium. Similar to the behavior found in the S-wave channel their spectra show a characteristic broadening, as well as mass shifts to lower energy with increasing temperature. In contrast to the S-wave states, finite angular momentum leads to the survival of spectral peaks even at temperatures, where the continuum threshold reaches below the bound state remnant mass. We elaborate on the ensuing challenges in defining quarkonium dissolution and present estimates of melting temperatures for the spin averaged χ b and χ c states. As an application to heavy-ion collisions we further estimate the contribution of feed down to S-wave quarkonium through the P-wave states after freezeout.

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An updated study of ϒ production and polarization at the Tevatron and LHC

Cited by 49 publications

References 45 publications

Measurement of ϒ production in pp collisions at $$ \sqrt{s}=13 $$ TeV

Measurement of ϒ production in pp collisions at $$ \sqrt{s}=13 $$ TeV

Challenges in Heavy Flavor and Quarkonium Production inp + pCollisions at the LHC

In-medium P-wave quarkonium from the complex lattice QCD potential

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