Measurement of the Lifetimes of Charged and Neutral Beauty Hadrons: Fermilab E653 Collaboration

Kodama, K.; Ushida, N.; Mokhtarani, A.; Paolone, V.; Volk, J.; Wilcox, J.; Yager, P. M.; Edelstein, R. M.; Freyberger, A.; Gibaut, D.; Lipton, R.; Nichols, W. R.; Potter, Douglas M.; Russ, J.; Zhang, C.; Zhang, Y.; Jang, H. I.; Kim, J. Y.; Kim, T. I.; Kim, I. T.; Pac, M. Y.; Baller, B.; Stefanski, R. J.; Nakazawa, Kimitaka; Chung, K.S.; Chung, S. H.; Kim, D. C.; Park, I. G.; Park, M. S.; Song, J.; Yoon, C. S.; Chikawa, M.; Abe, T.; Fujii, T.; Fujioka, G.; Fujiwara, K.; Fukushima, Hiroshi; Hara, T.; Takahashi, Yoshiki; Taruma, K.; Tsuzuki, Y.; Yokohama, C.; Chang, S. D.; Cheon, B. G.; Cho, J. H.; Kang, J. S.; Kim, C. O.; Kim, K. Y.; Kim, T. Y.; Lee, J. C.; Lee, S. B.; Lim, G. Y.; Nam, S.; Shin, T.; Sim, K. S.; Woo, Jong-Kwan; Isokane, Y.; Tsuneoka, Y.; Aoki, Shigeki; Gauthier, A.; Hoshino, K.; Kitamura, Hirokazu; Kabayashi, M.; Miyanishi, M.; Nakamura, K.; Nakamura, Mitsuhiro; Nakamura, Yuya; Nakanishi, S.; Niu, K.; Niwa, K.; Nomura, M. A.; Tajima, H.; Yoshida, S.; Aryal, M.; Dunlea, J.; Freederiksen, S. G.; Kuramata, S.; Lundberg, B.; Oleynik, G.; Reay, N. W.; Reibel, K.; Sidwell, R. A.; Stanton, N. R.; Moriyama, K.; Shibata, Hiroyuki; Kalbfleisch, G.; Skubic, P.; Snow, J.; Willis, S.; Kusumoto, O.; Okusawa, T.; Teranaka, M.; Tominaga, T.; Yoshida, T.; Yuuki, H.; Okabe, H.; Yokota, J.; Adachi, Minoru; Kazuno, M.; Niu, E.; Shibuya, H.; Watanabe, Shuji; Ohtsuka, I.; Sato, Yoshihiro; Tezuka, I.; Bahk, S. Y.; Kim, S. K.

doi:10.1143/ptp/89.3.679

Cited by 26 publications

(37 citation statements)

References 1 publication

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“…The shapes of the theoretical p T spectra for unfragmented charm quark production are consistent with data on the hadroproduction of D mesons from experiments E769 [51] and WA82 [1]. E653 reported that the shape of the unfragmented NLO pQCD transverse momentum distribution was "somewhat harder" than the observed distribution [15]. Our data probe a larger p T range, and the unfragmented theoretical p T spectrum is clearly harder than the spectrum observed in our data.…”

Section: A Differential Cross Sectionssupporting

confidence: 87%

“…The next-to-leading order (NLO) contributions to the cross sections have been evaluated [5][6][7][8], and are comparable to the leadingorder contributions. While the results of the NLO calculations can accommodate the charm cross sections observed in π − -nucleon interactions [9][10][11][12][13][14][15], the large size of the NLO contributions is an indication that still higher order contributions may be significant. Furthermore, NLO calculations of the total charm quark cross section exhibit significant sensitivity to the choice of input parameters, including the charm quark mass (m c ), the renormalization and factorization scales, as well as the parton distribution functions (PDF's).…”

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confidence: 99%

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Production of charm mesons at high transverse momentum in 515 GeV/cπ−-nucleon collisions

Apanasevich¹,

Bacigalupi²,

Baker³

et al. 1997

Phys. Rev. D

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We present results on the production of high transverse momentum charm mesons in collisions of 515 GeV/c negative pions with beryllium and copper targets. The experiment recorded a large sample of events containing high transverse momentum (p T ) showers detected in an electromagnetic calorimeter. From these data, a sample of charm mesons has been reconstructed via their decay into the fully charged K mode. A measurement of the single inclusive transverse momentum distribution of charged D mesons from 1 to 8 GeV/c is presented. An extrapolation of the measured differential cross section yields an integrated D Ϯ cross section of 11.4Ϯ2.7(stat)Ϯ3.3͑syst͒ b per nucleon for D Ϯ mesons with x F Ͼ0. The data are compared with expectations based upon next-to-leading-order perturbative QCD, as well as with results from PYTHIA. We also compare our integrated D Ϯ cross section with measurements from other experiments.

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Section: A Differential Cross Sectionssupporting

confidence: 87%

mentioning

confidence: 99%

Production of charm mesons at high transverse momentum in 515 GeV/cπ−-nucleon collisions

Apanasevich¹,

Bacigalupi²,

Baker³

et al. 1997

Phys. Rev. D

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show abstract

“…Ref. [107] where a comparison of 600 GeV π − emulsion data with the next-to-leading order pQCD predictions was made).…”

Section: Recombination Quark-parton Model (Rqpm)mentioning

confidence: 99%

Atmospheric muon flux at sea level, underground, and underwater

et al. 1998

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The vertical sea-level muon spectrum at energies above 1 GeV and the muon intensities at depths up to 18 km w.e. in different rocks and in water are calculated. The results are particularly collated with a great body of the ground-level, underground, and underwater muon data. In the hadron-cascade calculations, we take into account the logarithmic growth with energy of inelastic cross sections and pion, kaon, and nucleon generation in pion-nucleus collisions. For evaluating the prompt muon contribution to the muon flux, we apply the two phenomenological approaches to the charm production problem: the recombination quark-parton model and the quark-gluon string model. We give simple fitting formulas describing our numerical results. To solve the muon transport equation at large depths of a homogeneous medium, we use a semianalytical method, which allows the inclusion of an arbitrary (decreasing) muon spectrum at the medium boundary and real energy dependence of muon energy losses. Our analysis shows that at the depths up to 6-7 km w.e., essentially all underground data on the muon flux correlate with each other and with the predicted one for conventional (π, K)-muons, to within 10 %. However, the high-energy sea-level muon data as well as the data at high depths are contradictory and cannot be quantitatively described by a single nuclear-cascade model.

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“…Table II and the top portion of Fig. 4 compare the values of the form factor ratios r V and r 2 measured by E791 with previous experimental results [9][10][11]. The size of the data sample and the decay channel are listed in Table II for each experiment.…”

Section: October 21 2018mentioning

confidence: 69%

Measurement of the form-factor ratios for D→ℓν

et al. 1998

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We have measured the form factor ratios rV = V (0)/A1(0) and r2 = A2(0)/A1(0) for the decay D + s → φ ℓ + ν ℓ , φ → K + K − , using data from charm hadroproduction experiment E791 at Fermilab. Results are based on 144 signal and 22 background events in the electron channel and 127 signal and 34 background events in the muon channel. We combine the measurements from both lepton channels to obtain rV = 2.27 ± 0.35 ± 0.22 and r2 = 1.57 ± 0.25 ± 0.19. 1320.Fc,14.40.LbSemileptonic decays of mesons containing one heavy quark are described in simplest terms by a spectator model in which the heavy quark decays semileptonically while the light spectator antiquark passes from the parent meson to the final-state meson. These decays are still relatively simple when one considers hadrons rather than quarks; the leptonic and hadronic currents factorize, and all strong-interaction effects can be parametrized by a few form factors [1].If SU(3) flavor symmetry is approximately valid, replacing a spectator d quark by a spectator s quark should have little effect on the form factors. We have investigated this spectator replacement experimentally in charm meson decay, and report here new measurements by Fermilab experiment E791 of form factor ratios for D + s → φ e + ν e and D + s → φ µ + ν µ , with φ → K + K − . These D s results are then combined and compared to 1

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Measurement of the Lifetimes of Charged and Neutral Beauty Hadrons: Fermilab E653 Collaboration

Cited by 26 publications

References 1 publication

Production of charm mesons at high transverse momentum in 515 GeV/cπ−-nucleon collisions

Production of charm mesons at high transverse momentum in 515 GeV/cπ−-nucleon collisions

Atmospheric muon flux at sea level, underground, and underwater

Measurement of the form-factor ratios for D→ℓν

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