Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi><mml:mn/><mml:mo>(</mml:mo><mml:mn>3.1</mml:mn><mml:mo>)</mml:mo><mml:mn/></mml:math>Meson Production by Pions and Protons

Blanar, G.; Boyer, C. F.; Faissler, W.; Garelick, D.; Gettner, M.; Glaubman, M.; Johnson, J. R.; Johnstad, H.; Mallary, M.L.; Pothier, E.; Potter, Douglas M.; Tautz, M. F.; Goeler, E. von; Weinstein, R.

doi:10.1103/physrevlett.35.346

Cited by 38 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the dependence of 1/1(3095) yield on x, they find r:t. = 2.9 ± 0.3 for production by protons and r:t. = 1.7 ± 0.4 for production by pions. The steeper x dependence with incident protons than with pions agrees with earlier results of Blanar et al (36) fo r n-and proton interactions with iron. The parameters of the P.L dependence obtained are b = 2.1 ±OJ c Gey-1 and b = 2.6 ± 0.4 c GeV-1 for incident protons and pions, respectively.…”

Section: Production Ofl/l and 1/1' In Hadron-hadron Collisionssupporting

confidence: 90%

Psionic Matter

Chinowsky¹

1977

Annu. Rev. Nucl. Sci.

View full text Add to dashboard Cite

Section: Production Ofl/l and 1/1' In Hadron-hadron Collisionssupporting

confidence: 90%

Psionic Matter

Chinowsky¹

1977

Annu. Rev. Nucl. Sci.

View full text Add to dashboard Cite

“…7, will be 1.45 independent of the magnitude of r,. We will see that the measured value of R, is of the order of, or greater than, 5 and then violates these limits by large factors.…”

mentioning

confidence: 81%

“…The value of R. can then be taken directly from the graph as the ratio of the two sets of values. Defined in this way, the measured value of RM appears to be more or less independent of energy except, perhaps, at the lowest energies, and appears to have a value that is no less than 5 and far greater than the limits imposed by the relations of Eqs. 6 and 7. Attempts have been made to explain the J/I production in a related manner through the "fusion" of charm-anticharm * Some relevant relations, as well as the resonance parameters used in this paper, are found in an invaluable review by Feldman (1 In summary, we see that the hypothesis that the production of the J/I in nucleon-nucleon interactions can be described by the resonant or fusion interactions of the quasi-free quarks which make up the nucleon according to the parton model (12)(13)(14) is untenable, though related calculations (15) of the continuum lepton pair production seem to be successful.…”

mentioning

confidence: 99%

See 1 more Smart Citation

On the failure of the Drell-Yan parton model to account for production of the J /Ψ in nucleon-nucleon interactions

Adair

1978

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

We calculate the cross sections for the production of the J/+ in nucleon-nucleon interactions on the basis of a naive Drell-Yan-type parton model where the I production is considered as production through the resonant or fusion interaction of quarks and antiquarks resident in the colliding nucleons. The interacting quarks are assumed to act as free point Dirac particles obeying the Bethe-Heitler description of annihilation to lepton pairs. where Fq is the width for a specific quark, FM, is the width for decay to muon pairs, and F is the total width. We then find the number of resonant interactions per second derived from the flux A(M) by integrating Eq. 2 with the I-spin, J = 1, and the quark spin, Sq = 1/2:The ratio of resonance production of muon pairs and the background production through the Bethe-Heitler mechanism will then be:For a given value of FM, this ratio will be largest for Fq F» >> rF; for a given value of r, the ratio will be greatest for the condition r, = Fq = F/2, which corresponds to the familiar unitary limit of ir/k2 with spin factors. The respective limits will then be:or RAM = 0.665 -i0 rF/(AM Q2), [5] where Q2 cannot be less than 1/9. We can define a more realistic limit by considering that the mean square charge effective in background pair production in proton-nucleus interactions will be about 1/3, and from 1A-e universality: r, = re. If we introduce color and assume that u and d-quark couplings to the resonant state are equal, the maximum possible value of the ratio RM will occur for the condition such that rur=ruw=rub=Frd=rdw=rdb=r/6>>r =re and, for numerical convenience, taking AM as 1 GeV/c2 and r in keV, RM = 0.13 FM.[6]If we express the maximum value of R, in terms of the total width, the maximum will occur under the condition [7]If we use the measured* value of FM for the I as 4.8 keV, the maximum value of RJMallowed by the unitary limit of Eq. 6 will be 0.64 independent of the total width. If we use the measured total width, F = 69 keV, as a constraint, the maximum value of Ri', calculated from Eq. 7, will be 1.45 independent of the magnitude of r,. We will see that the measured value of R, is of the order of, or greater than, 5 and then violates these limits by large factors.Most of the reports of measurements of J/I production in nucleon-nucleon interactions through measurements of lepton pairs do not present values of the continuum in a manner that can be applied to an evaluation of RI, unambiguously. We then present measured valuest of Ba in Fig. 1 together with the "best fit" to the continuum lepton pair production proposed by Pope and Lederman (11) for the cross section dobh/dM for M = M and dM taken as 1.0 GeV. The error marked on the continuum cross section is our own and is intended to be generous. The value of R. can then be taken directly from the graph as the ratio of the two sets of values. Defined in this way, the measured value of RM appears to be more or less independent of energy except, perhaps, at the lowest energies, and appears to have a value that ...

show abstract

“…Reactions (3) and (4), respectively. 2 c) and d) dcr/dM for the calibration data (no muon required).…”

Section: New Particle Searchmentioning

confidence: 99%

Dimuon production by pions and protons in iron and a search for the production in hydrogen of new particles which decay into muons

Blanar¹,

Boyer²,

Faissler³

et al. 1976

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Dimuon production cross sections have been measured with a·200 GeV n-beam and a 240 GeV proton (p) beam. The dimuon mass spectra produced by nand p have essentially the same shape. The dimuon transverse momentum behavior is essentially the same for vector mesons produced by n or by p. For (P+W) or Vproduction the x (Feynman) behavior is approximately independent of the mass of the dimuon produced. The dimuon n production cross section is approximately 6 times greater than that of the p for x > .5.Using a missing mass (Mm) technique, the same pion and proton beams were used to search for the production in hydrogen of new particles which decay with muon emission. Model dependent upper limits (50 to 7000 nanobarns) for the production of such objects with 2.5 < MID < 7. GeV are given (for charmed meson pair production M m is the mass of the DD system).

show abstract

Measurement ofψ(3.1)Meson Production by Pions and Protons

Cited by 38 publications

References 10 publications

Psionic Matter

Psionic Matter

On the failure of the Drell-Yan parton model to account for production of the J /Ψ in nucleon-nucleon interactions

Dimuon production by pions and protons in iron and a search for the production in hydrogen of new particles which decay into muons

Contact Info

Product

Resources

About