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Measurement of the relative prompt production rate of χ c2 and χ c1 in pp collisions at [Formula: see text].

- Eur Phys J C Part Fields (2012)

Bottom Line: The two states are measured via their radiative decays χ c→J/ψ+γ, with the photon converting into an e(+)e(-) pair for J/ψ rapidity /y(J/ψ)/<1.0 and photon transverse momentum p T(γ)>0.5 GeV/c.The measurement is given for six intervals of p T(J/ψ) between 7 and 25 GeV/c.The results are compared to theoretical predictions.

View Article: PubMed Central - PubMed

Affiliation: Yerevan Physics Institute, Yerevan, Armenia.

ABSTRACT

A measurement is presented of the relative prompt production rate of χ c2 and χ c1 with 4.6 fb(-1) of data collected by the CMS experiment at the LHC in pp collisions at [Formula: see text]. The two states are measured via their radiative decays χ c→J/ψ+γ, with the photon converting into an e(+)e(-) pair for J/ψ rapidity /y(J/ψ)/<1.0 and photon transverse momentum p T(γ)>0.5 GeV/c. The measurement is given for six intervals of p T(J/ψ) between 7 and 25 GeV/c. The results are compared to theoretical predictions.

No MeSH data available.


Related in: MedlinePlus

Ratio of the χc2 to χc1 production cross sections (circles) and ratio of the cross sections times the branching fractions to J/ψ+γ (squares) as a function of the J/ψ transverse momentum with the hypothesis of unpolarized production. The error bars correspond to the statistical uncertainties and the band corresponds to the systematic uncertainties. For the cross section ratios, the 5.6 % uncertainty from the branching fractions is not included
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Fig3: Ratio of the χc2 to χc1 production cross sections (circles) and ratio of the cross sections times the branching fractions to J/ψ+γ (squares) as a function of the J/ψ transverse momentum with the hypothesis of unpolarized production. The error bars correspond to the statistical uncertainties and the band corresponds to the systematic uncertainties. For the cross section ratios, the 5.6 % uncertainty from the branching fractions is not included

Mentions: The results of the measurement of the ratio Rp and of the ratio of the χc2 to χc1 prompt production cross sections for the kinematic range pT(γ)>0.5 GeV/c and /y(J/ψ)/<1.0 are reported in Tables 6 and 7, respectively, for different ranges of pT(J/ψ). The first uncertainty is statistical, the second is systematic, and the third comes from the uncertainty in the branching fractions in the measurement of the cross section ratio. Separate columns are dedicated to the uncertainty derived from the extreme polarization scenarios in the helicity and Collins–Soper frames, by choosing from Tables 4 and 5 the scenarios that give the largest variations relative to the unpolarized case. These correspond to and for both the helicity and Collins–Soper frames. Figure 3 displays the results as a function of the J/ψ transverse momentum for the hypothesis of unpolarized production. The error bars represent the statistical uncertainties and the green bands the systematic uncertainties. Fig. 3


Measurement of the relative prompt production rate of χ c2 and χ c1 in pp collisions at [Formula: see text].

- Eur Phys J C Part Fields (2012)

Ratio of the χc2 to χc1 production cross sections (circles) and ratio of the cross sections times the branching fractions to J/ψ+γ (squares) as a function of the J/ψ transverse momentum with the hypothesis of unpolarized production. The error bars correspond to the statistical uncertainties and the band corresponds to the systematic uncertainties. For the cross section ratios, the 5.6 % uncertainty from the branching fractions is not included
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4370953&req=5

Fig3: Ratio of the χc2 to χc1 production cross sections (circles) and ratio of the cross sections times the branching fractions to J/ψ+γ (squares) as a function of the J/ψ transverse momentum with the hypothesis of unpolarized production. The error bars correspond to the statistical uncertainties and the band corresponds to the systematic uncertainties. For the cross section ratios, the 5.6 % uncertainty from the branching fractions is not included
Mentions: The results of the measurement of the ratio Rp and of the ratio of the χc2 to χc1 prompt production cross sections for the kinematic range pT(γ)>0.5 GeV/c and /y(J/ψ)/<1.0 are reported in Tables 6 and 7, respectively, for different ranges of pT(J/ψ). The first uncertainty is statistical, the second is systematic, and the third comes from the uncertainty in the branching fractions in the measurement of the cross section ratio. Separate columns are dedicated to the uncertainty derived from the extreme polarization scenarios in the helicity and Collins–Soper frames, by choosing from Tables 4 and 5 the scenarios that give the largest variations relative to the unpolarized case. These correspond to and for both the helicity and Collins–Soper frames. Figure 3 displays the results as a function of the J/ψ transverse momentum for the hypothesis of unpolarized production. The error bars represent the statistical uncertainties and the green bands the systematic uncertainties. Fig. 3

Bottom Line: The two states are measured via their radiative decays χ c→J/ψ+γ, with the photon converting into an e(+)e(-) pair for J/ψ rapidity /y(J/ψ)/<1.0 and photon transverse momentum p T(γ)>0.5 GeV/c.The measurement is given for six intervals of p T(J/ψ) between 7 and 25 GeV/c.The results are compared to theoretical predictions.

View Article: PubMed Central - PubMed

Affiliation: Yerevan Physics Institute, Yerevan, Armenia.

ABSTRACT

A measurement is presented of the relative prompt production rate of χ c2 and χ c1 with 4.6 fb(-1) of data collected by the CMS experiment at the LHC in pp collisions at [Formula: see text]. The two states are measured via their radiative decays χ c→J/ψ+γ, with the photon converting into an e(+)e(-) pair for J/ψ rapidity /y(J/ψ)/<1.0 and photon transverse momentum p T(γ)>0.5 GeV/c. The measurement is given for six intervals of p T(J/ψ) between 7 and 25 GeV/c. The results are compared to theoretical predictions.

No MeSH data available.


Related in: MedlinePlus