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 Production at LHC and Implications for the Understanding of 
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 Production

Han, H.; Ma, Yan-Qing; Meng, Cai; Shao, Hua-Sheng; Kong, Chao

doi:10.1103/physrevlett.114.092005

Cited by 99 publications

(169 citation statements)

References 26 publications

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“…The differences among the numerical values reveal the difficulties to determine the exact values of the color-octet LDMEs. The work by Chao et al implies that a wide range of values for 1 S 8 0 can satisfy the yields and polarizations of the J/ψ production at hadron colliders [6,7,11,12]. The polarization puzzle can be understood in two different ways: the contributions from 3 [23], the continuum cross sections are sightly above 5 pb and below 10 pb.…”

Section: B-factory Regionmentioning

confidence: 99%

“…For the long-pending polarization puzzle of J/ψ production, it seems also to be understood naturally using a e-mail: nophy0@gmail.com b e-mail: liukuiyong@lnu.edu.cn the NLO calculations [11]. Subsequently, the NLO analysis was also made for the η c production at hadron colliders and fitted the data well using a set of compilable LDMEs with the J/ψ polarization [12,13] 1 .…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the analysis combined with the data at other colliders [9] or the data of other charmonium states (e.g. η c ) [12][13][14] production may help to determine the magnitude of the three color-octet LDMEs. 1 In fact, different groups adopt different strategies to fit to the data, therefore, obtained different conclusions.…”

Section: Introductionmentioning

confidence: 99%

“…Their calculations suggest the unpolarized data could be understood by assuming that the contributions from the 3 S 8 1 and 3 P 8 0 channels cancel or the 1 S 8 0 channel dominate the cross sections in comparison with other channels [6,7,11]. Meanwhile, η c production at the LHC could be understood in the same theoretical framework [12]. But the referred work does not fit the HERA ep production data and cannot describe the LHC distributions.…”

Section: Introductionmentioning

confidence: 99%

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Study of color-octet matrix elements through $$J/\psi $$ J / ψ production in $$e^{+}e^{-}$$

Zhang

et al. 2017

Eur. Phys. J. C

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In this paper, the color-octet long distance matrix elements are studied through the inclusive J/ψ production in e + e − annihilation within the framework of nonrelativistic QCD factorization. The calculations are up-to next-to-leading order with the radiative and relativistic corrections in the energy region of the B-factory and the near-threshold region of 4.6−5.6 GeV. A constraint of the long distance matrix elements ( 1 S 8 0 , 3 P 8 0 ) is obtained. Through our estimation, the P-wave color-octet matrix element ( 0| 3 P 8 0 |0 ) should be of the order of 0.008m 2 c GeV 3 or less. The constrained region is not compatible with the values of the long distance matrix elements fitted at hadron colliders.

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Section: B-factory Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of color-octet matrix elements through $$J/\psi $$ J / ψ production in $$e^{+}e^{-}$$

Zhang

et al. 2017

Eur. Phys. J. C

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“…A different approach was taken in Ref. [46] where they found, for the J/ψ, O J/ψ ( 1 S [8] 0 ) can be negligibly small so that O η c ( 3 S [8] 1 ) does not play a role in η c production, allowing the color singlet contributions to dominate η c production, offering a way out of the problem. However, it does not provide a very good fit to the J/ψ polarization data.…”

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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Gluon fragmentation into quarkonium at next-to-leading order using FKS subtraction

Artoisenet

Braaten

2019

J. High Energ. Phys.

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We present the calculation at next-to-leading order (NLO) in α s of the fragmentation function of a gluon into heavy quarkonium in the color-octet spin-singlet S-wave channel. To calculate the real NLO corrections, we adapt a subtraction scheme introduced by Frixione, Kunszt, and Signer.Ultraviolet and infrared divergences in the real NLO corrections are calculated analytically by evaluating the phase-space integrals of the subtraction terms using dimensional regularization. The subtracted phase-space integrals are then evaluated in 4 space-time dimensions. The divergences in the virtual NLO corrections are also calculated analytically. After renormalization, all the divergences cancel. The NLO corrections significantly increase the fragmentation probability for a gluon into the spin-singlet quarkonium states η c and η b . The sum extends over the types of partons i (gluons, quarks, and antiquarks). The symbol "⊗" in Eq. (1) represents a convolution integral over the longitudinal momentum fraction z of the hadron H relative to the parton. The pQCD cross section dσ for producing the parton i can be expanded in powers of α s (p T ), and it includes convolutions with parton distributions if the colliding particles are hadrons. The nonperturbative factor D i→H (z) is a fragmentation function that gives the probability distribution for z. We refer to Eq. (1) as the leading-power (LP) factorization formula. It was derived by Collins and Soper in 1981 for the case of a light hadron H at a transverse momentum satisfying p T Λ QCD [1].The LP factorization formula in Eq. (1) applies equally well to heavy quarkonium at a transverse momentum satisfying p T m, where m is the mass of the heavy quark.A proof of this factorization theorem that deals with issues specific to heavy quarkonium production was first sketched by Nayak, Qiu, and Sterman in 2005 [2]. The LP factorization formula gives the leading power in the expansion in powers of m/p T . In the case of cross sections summed over quarkonium spins, the corrections are suppressed by m 2 /p 2 T . The LP factorization formula has limited predictive power, because the nonperturbative factors D i→H (z) are functions of z that must be determined from experiment.In 1994, Bodwin, Braaten, and Lepage proposed the NRQCD factorization formula for cross sections for heavy quarkonium production [3]. It uses an effective field theory called nonrelativistic QCD to separate momentum scales of order m and larger from momentum scales of order mv and smaller, where v is the typical relative velocity of the Q orQ in the quarkonium. The theoretical status of the NRQCD factorization conjecture is discussed in Ref. [4]. The predictive power of the LP factorization formula for heavy quarkonium in Eq. (1) can be increased by applying the NRQCD factorization formula to the fragmentation

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ηc Production at LHC and Implications for the Understanding of J/ψ Production

Cited by 99 publications

References 26 publications

Study of color-octet matrix elements through $$J/\psi $$ J / ψ production in $$e^{+}e^{-}$$

Study of color-octet matrix elements through $$J/\psi $$ J / ψ production in $$e^{+}e^{-}$$

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

Gluon fragmentation into quarkonium at next-to-leading order using FKS subtraction

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