Tevatron and LHC potential for observing χ
                     b

Брагута, В. В.; Likhoded, A. K.; Luchinsky, A. V.

doi:10.1134/s1063778807020196

Cited by 43 publications

(144 citation statements)

References 23 publications

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“…containing two heavy quarks. Only quite recently did charmonium wave functions become the subject of investigation [18][19][20][21][22][23][24][25][26]. In this article, we present results obtained in [20][21][22]25].…”

Section: Introductionmentioning

confidence: 85%

Exclusive processes of charmonium production and charmonium wave functions

2012

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Results obtained by studying the properties of the leading-twist wave functions for the S-and P -wave states of charmonia are presented. Wave-function models that can be used to calculate various processes involving the production of these mesons were constructed on the basis of these investigations. Calculations for some exclusive processes of charmonium production were performed within the models in question.

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Section: Introductionmentioning

confidence: 85%

Exclusive processes of charmonium production and charmonium wave functions

2012

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“…(21) and (23). The relativistic corrections can be estimated as hv 2 i 1S ¼ 0:21 [27], hv 2 i 2S ¼ 0:54 [29], hv 2 i P ¼ 0:3 [30]. The radiative corrections can be estimated as $ s ðM J=É Þ ¼ 0:25.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In the calculation we also need the values of constants (15) and (16) for the charmonia mesons. At the leading order approximation in s and relative velocity these constants can be determined from the leptonic decay widths…”

Section: Numerical Resultsmentioning

confidence: 99%

“…J=É c , J=É 0 c , c 0 c , c 0 0 c , J=É c0 , and c 0 c0 at the Belle [1,2] and BABAR [3] Collaborations, which were approximately by an order of magnitude larger than the leading order nonrelativistic QCD (NRQCD) predictions [4][5][6]. There were many attempts to resolve this discrepancy [7][8][9][10][11][12][13][14][15][16][17]. Lately, it has been shown that the agreement between theory and experiment can be achieved if one takes into account radiative and relativistic corrections to the cross sections [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that DAs contain information about the structure of charmonia mesons. To do the calculation of the decay widths we are going to apply models of the S-and P-wave charmonia DAs proposed in papers [27][28][29][30]. We also apply NRQCD to study the same processes.…”

Section: Introductionmentioning

confidence: 99%

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Double charmonium production in exclusive bottomonia decays

Брагута¹,

Likhoded²,

Luchinsky³

2009

Phys. Rev. D

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This paper is devoted to the leading twist exclusive bottomonia decays with double charmonium in the final state. Using models of the twist-2 charmonia distribution amplitudes the widths of these decays are calculated within light cone formalism. In addition, the processes under consideration are studied within nonrelativistic QCD. In our analysis we have found that the production of some of the $P$-wave charmonia mesons with $L_z \neq 0$ is allowed already at the leading twist approximation. This means that the selection rules which predict the suppression of such decays are violated. The mechanism which lies behind this violation is discussed.Comment: Minor changes, some references adde

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Exclusive radiative decays of W and Z bosons in QCD factorization

Grossman

König

Neubert

2015

J. High Energ. Phys.

105

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We present a detailed theoretical analysis of very rare, exclusive hadronic decays of the electroweak gauge bosons V = W, Z from first principles of QCD. Our main focus is on the radiative decays V → M γ, in which M is a pseudoscalar or vector meson. At leading order in an expansion in powers of Λ QCD /m V the decay amplitudes can be factorized into convolutions of calculable hard-scattering coefficients with the leading-twist light-cone distribution amplitude of the meson M . Power corrections to the decay rates arise first at order (Λ QCD /m V ) 2 . They can be estimated in terms of highertwist distribution amplitudes and are predicted to be tiny. We include one-loop O(α s ) radiative corrections to the hard-scattering coefficients and perform the resummation of large logarithms α s ln(m 2 V /µ 2 0 ) n (with µ 0 ∼ 1 GeV a typical hadronic scale) to all orders in perturbation theory. Evolution effects have an important impact both numerically and conceptually, since they reduce the sensitivity to poorly determined hadronic parameters. We present detailed numerical predictions and error estimates, which can serve as benchmarks for future precision measurements. We also present an exploratory study of the weak radiative decays Z → M W . Some of the decay modes studied here have branching ratios large enough to be accessible in the high-luminosity run of the LHC. Many of them can be measured with high accuracy at a future lepton collider. This will provide stringent tests of the QCD factorization formalism and enable novel searches for new physics.One of the main challenges to particle physics is to obtain a rigorous control of stronginteraction phenomena in a regime where QCD is strongly coupled. Over the years, lattice QCD has made much progress in computing the static properties of hadrons from first principles. The concept of quark-hadron duality has enabled us to make systematic predictions for inclusive decay processes with a large energy release, such as e + e − → hadrons at large √ s, or inclusive weak decays like B → Xlν. In these cases, non-perturbative aspects of the strong interactions can be accounted for using a local operator-product expansion. A conceptually more difficult problem is to control strong-interaction effects in exclusive hadronic processes at large energy. For deep-inelastic scattering a factorization theorem can be derived, in which all non-perturbative physics associated with the initial-state nucleon can be described in terms of parton distribution functions (PDFs), up to power corrections suppressed by Λ QCD / √ s. The same framework is routinely used to calculate cross sections at hadron colliders such as the LHC in terms of convolutions of calculable partonic cross sections with PDFs, even though the underlying factorization formula can only be proved for the simplest such processes.The QCD factorization approach developed by Brodsky and Lepage [1, 2], Efremov and Radyushkin [3,4] and others [5] provides a theoretical basis for controlling strong-interaction effects in exclusive p...

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Tevatron and LHC potential for observing χ b

Cited by 43 publications

References 23 publications

Exclusive processes of charmonium production and charmonium wave functions

Exclusive processes of charmonium production and charmonium wave functions

Double charmonium production in exclusive bottomonia decays

Exclusive radiative decays of W and Z bosons in QCD factorization

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