Study of continuum<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>*</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>spin alignment

Kubota, Y.; Nelson, J. K.; Perticone, D.; Poling, R.; Schrenk, S.; Crawford, G.; Fulton, R.; Jensen, T.; Johnson, D. R.; Kagan, H.; Kass, R.; Malchow, R.; Morrow, F.; Whitmore, J.; Wilson, P.; Bortoletto, D.; Brown, D. N.; Dominick, J.; McIlwain, R. L.; Miller, D. H.; Modesitt, M.; Ng, C. R.; Schaffner, S. F.; Shibata, E. I.; Shipsey, I. P. J.; Battle, M.; Kroha, H.; Sparks, K.; Thorndike, E. H.; Wang, C. H.; Alam, M. S.; Kim, I. J.; Li, W. C.; Nemati, B.; Romero, V.; Sun, C. R.; Wang, P. N.; Zoeller, M. M.; Goldberg, M.; Haupt, T.; Horwitz, N.; Jain, V.; Mestayer, M. D.; Moneti, G. C.; Rozen, Y.; Rubin, P.; Skwarnicki, T.; Stone, S.; Thusalidas, M.; Yao, Wei-Ming; Zhu, G.; Barnes, A. V.; Bartelt, J.; Csorna, S. E.; Letson, T.; Avery, P.; Alexander, J.; Artuso, M.; Bebek, C.; Berkelman, K.; Besson, D.; Browder, T. E.; Cassel, D. G.; Cheu, E.; Coffman, D. M.; Drell, P. S.; Ehrlich, R.; Garcia-Sciveres, M.; Geiser, B.; Gittelman, B.; Gray, S. W.; Halling, A. M.; Hartill, D. L.; Heltsley, B. K.; Honscheid, K.; Kandaswamy, J.; Katayama, N.; Kreinick, D. L.; Lewis, J. D.; Ludwig, G. S.; Masui, J.; Mevissen, J.; Mistry, N. B.; Nandi, S.; Nordberg, E.; O’Grady, C. P.; Peterson, D.; Pisharody, M.; Riley, D.; Sapper, M.; Selen, M.; Silverman, A.; Worden, H. M.; Worris, M.; Sadoff, A. J.; Garren, L.; Rodriguez, J. L.; Yelton, J.; Hederson, S.; Kinoshita, K.; Pipkin, F. M.; Procario, M.; Wilson, Richard; Wolinski, J.; Ammar, R.; Baringer, P.; Coppage, D.; Davis, R.; Haas, P.; Kelly, M. P.; Kwak, N.; Lam, H.; Ro, S. R.

doi:10.1103/physrevd.44.593

Cited by 9 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since our polarized fragmentation functions given in Eqns. (22) and (25) are consistent with the general analysis of Jaffe and Randall [16], we can apply them to describe the heavy-light mesons as well. The formulas given in Eqns.…”

Section: Heavy Quark Spin Symmetrysupporting

confidence: 80%

“…By setting r = 1/2 in the Eqns. (22) and (25), we reproduce the results of c → polarized J/ψ given in Ref. [12].…”

Section: Fragmentation Functions For Polarized B * C Mesonmentioning

confidence: 66%

“…The formulas given in Eqns. (22) and (25) can be regarded as phenomenological fragmentation functions with two free parameters N and r, to describe the nonperturbative process of a heavy quark splitting into a polarized heavy-light excited meson, such as c → polarized D * and b → polarized B * . The parameter N can be adjusted to describe the overall normalization and r is the mass ratio of the light constituent quark mass to the meson mass.…”

Section: Heavy Quark Spin Symmetrymentioning

confidence: 99%

“…A recent set of experimental data on the spin alignment of D * meson was from the CLEO detector operating at a center-of-mass energy of 10.5 GeV [22]. The data set given in Table I of Ref.…”

Section: Spin Alignment In Heavy Quark Fragmentationmentioning

confidence: 99%

See 3 more Smart Citations

Spin alignment in the production of charm and/or bottom vector mesons via heavy quark fragmentation

Cheung

Yuan

1994

Phys. Rev. D

View full text Add to dashboard Cite

%e calculate the process-independent fragmentation functions for a b antiquark to &agment into longitudinally and transversely polarized B; ( Sz) mesons to leading order in the +CD strong coupling constant. In the special case of equal quark mass, we recover previous results for the f'ragmentation of c m Q and b + T. Various spin asymmetry parameters are de6ned as measures of the relative population of the longitudinally and transversely polarized vector meson states. In the heavy quark mass limit m&~oo, our polarized fragmentation functions obey heavy quark spin symmetry, we therefore apply them as a model to describe the fragmentation of charm and bottom quarks into heavy-light mesons like D' snd B' Th.e spin asymmetry parameter, n(z), is consistent with the existing CLEO data for D' The s. caling behavior of (z) is studied in detail. We Snd excellent agreement between the predictions of (z) trom our fragmentation functions and the experimental data for D' and B' from the CERN LEP, CLEO, and ARGUS detectors. Finally, we also point out that the spin asymmetry depends signi6cantly on the transverse momentum pz of the vector mesons relative to the &agmentation axis.PACS number(s): 13. 87.Fh, 12.39. Hg, 13. 88.+e, 14.40.n lyzer of the heavy quark spin. Several recent works (Refs. [4 -8]) have been devoted to the polarization effects in the and Ap baryons at the CERN Large Electron-Positron Collider (LEP) energy. In this paper, we will investigate in detail the spin alignment of a heavy quark that undergoes &agxnentation into the spin triplet 8-wave meson state.Recently, it has been pointed out [9] that the dominant production of (bc) mesons at the large transverse momen-turn region is due to &agmentation, in which a high energy 6 antiquark is produced &om a hard process and subsequently fragments into various (bc) meson states. Furthermore, the corresponding process-independent fragmentation functions of b -+ B, (~S )sand b~B ;( Sq) were calculated within perturbative QCD (PQCD) [9,10] to leading order in both the strong coupling constant a, and v, where v is the typical velocity of the charm quark inside the meson. A lower bound of the inclusive branching &action for the production of B, at Z has been estimated to be about 2.3 x 10 4 [9], including both 1S and 2S states. It implies that only about 230 B+ or 230 B, are produced &om 10 Z . At the Fermilab Tevatron with a luminosity of 25 pb, one expects [ll] about 2 x 104 B mesons to be produced with pz (B, ) ) 10 GeV &om the direct 6 antiquark and induced gluon &agmentation. The three charged leptons &oxn a secondary vertex observed in the decay B+~J /Q+ E'vt followed by J/1b -+ l'f, where f, f' = e, p, can provide a clean signature for B,. The coxnbined branching ratio of these decays is expected to be 0.2%, which implies 40 distinct events at the Tevatron. In addition, the B meson can be fully reconstructed via hadronic decay modes, e.g. , B+~J /@ + sr+, with J/@~f /. Thus, unless LEP can increase its l~~minosity by an order of xnagnitude or so in the near future...

show abstract

Section: Heavy Quark Spin Symmetrysupporting

confidence: 80%

“…By setting r = 1/2 in the Eqns. (22) and (25), we reproduce the results of c → polarized J/ψ given in Ref. [12].…”

Section: Fragmentation Functions For Polarized B * C Mesonmentioning

confidence: 66%

Section: Heavy Quark Spin Symmetrymentioning

confidence: 99%

Section: Spin Alignment In Heavy Quark Fragmentationmentioning

confidence: 99%

See 2 more Smart Citations

Spin alignment in the production of charm and/or bottom vector mesons via heavy quark fragmentation

Cheung

Yuan

1994

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…One consequence of this is that D * mesons with j = 1 2 are produced unpolarized. This was confirmed with good accuracy by CLEO [13] in e + e − → cc events at √ s = 10.5 GeV and was also checked by other experiments [14]. Another prediction is that D * and D mesons are produced according to the number of available helicity states in a 3:1 ratio.…”

Section: Introductionsupporting

confidence: 70%

Observation ofDs1(2536)+→D+π−K+
Balagura¹,
Adachi²,
Aihara
³

et al. 2008
Phys. Rev. D
Self Cite
31
0
12
1
View full text Add to dashboard Cite

Is the fragmentation of charm quarks into D mesons described by heavy quark effective theory?

David

2007

Physics Letters B

View full text Add to dashboard Cite

Heavy quark effective theory predicts that produced charm quarks have the same probability to fragment into any of the four D mesons with orbital angular momentum L=0: the singlet D state and the triplet D * states. This would imply P V (D * , D) = 3/4, where P V is the ratio between directly produced L=0 vector states (D * ) and all L=0 (D and D * ) states. Experimental data collected in several different collision systems (e + e − , hadro-production, photo-production, etc.) and over a broad range of collision energies, show that P V (D * , D) = 0.594 ± 0.010. From this observation, it follows that "naive spin counting" does not apply to charm production, implying a revision of charm production calculations where this assumption is made.Keywords: Charm fragmentation fractions, Charmed meson production PACS numbers: 14.40. Lb, 12.39.Hg Submitted to Physics Letters B * Now at LIP, Lisbon, Portugal. EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH 027 Is the fragmentation of charm quarks into D mesons described by heavy quark effective theory?André David * CFTP-IST, Lisbon, Portugal and CERN-PH, Geneva, SwitzerlandHeavy quark effective theory predicts that produced charm quarks have the same probability to fragment into any of the four D mesons with orbital angular momentum L=0: the singlet D state and the triplet D * states. This would imply PV(D * , D) = 3/4, where PV is the ratio between directly produced L=0 vector states (D * ) and all L=0 (D and D * ) states. Experimental data collected in several different collision systems (e + e − , hadro-production, photo-production, etc.) and over a broad range of collision energies, show that PV(D * , D) = 0.594 ± 0.010. From this observation, it follows that "naive spin counting" does not apply to charm production, implying a revision of charm production calculations where this assumption is made.

show abstract

Study of continuumD*+spin alignment

Cited by 9 publications

References 24 publications

Spin alignment in the production of charm and/or bottom vector mesons via heavy quark fragmentation

Spin alignment in the production of charm and/or bottom vector mesons via heavy quark fragmentation

Observation ofDs1(2536)+→D+π−K+
Balagura¹,
Adachi²,
Aihara
³

et al. 2008
Phys. Rev. D
Self Cite
31
0
12
1
View full text Add to dashboard Cite

Is the fragmentation of charm quarks into D mesons described by heavy quark effective theory?

Contact Info

Product

Resources

About

Study of continuumD*+spin alignment

Cited by 9 publications

References 24 publications

Spin alignment in the production of charm and/or bottom vector mesons via heavy quark fragmentation

Spin alignment in the production of charm and/or bottom vector mesons via heavy quark fragmentation

Observation ofDs1(2536)+→D+π−K+Balagura1, Adachi2, Aihara3 et al. 2008Phys. Rev. DSelf Cite310121View full textAdd to dashboardCite

Is the fragmentation of charm quarks into D mesons described by heavy quark effective theory?

Contact Info

Product

Resources

About

Observation ofDs1(2536)+→D+π−K+
Balagura¹,
Adachi²,
Aihara
³

et al. 2008
Phys. Rev. D
Self Cite
31
0
12
1
View full text Add to dashboard Cite