W em easured twom om entsofthelepton m om entum spectrum in B ! X ‘ ,where‘= eor ,for p‘ 1:5 G eV=c. From these we derive the Heavy Q uark Expansion (HQ E)param eters (M S)= 0:39 0:03jstat 0:06jsys 0:12jth G eV and 1 = 0:25 0:02jstat 0:05jsys 0:14jth G eV ,through order 1=M 3 B in the non-perturbative expansion and 0 2 s in the perturbative expansion. The theoreticalexpression needed to extract jVcbjfrom the m easured sem ileptonic width is evaluated using theseHQ E param eters.Com bined with theworld averageofthesem ileptonicwidth,we nd jVcbj= (40:8 0:5j sl 0:4j( 1; )exp 0:9jth) 10 .Finally,theshortrange b-quark m assm 1S b is evaluated and found to be4:82 0:07jexp 0:11jth G eV/c . Subm itted to the 31 InternationalConferenceon High Energy Physics,July 2002,Am sterdam

The study of B meson decay appears to offer a unique opportunity to measure basic parameters of the Standard Model, probe for interactions mediated by higher mass particles, and investigate the origin of CP violation. These opportunities have been enhanced by the results of two measurements. The first is the measurement of a long B meson lifetime. In addition to allowing a simpler identification of B mesons and a measurement of the time of their decay, this observation implies that normal decays are suppressed, making rare decays more prevalent. The second measurement is that neutral B mesons are strongly mixed. This enhances the possibilities for studying CP violation in the B system. The CESR storage ring is likely to dominate the study of B physics in e{sup +}e{sup {minus}} annihilations for about the next five years. First, CESR has already reached a luminosity of 10{sup 32} cm{sup {minus}1} sec{sup {minus}1} and has plans for improvements which may increase the luminosity by a factor of about five. Second, a second-generation detector, CLEO II, will start running in 1989. Given this background, the main focus of this working group was to ask what is needed for the mid- to late-1990 s. Manymore » laboratories are thinking about new facilities involving a variety of techniques. To help clarify the choices, we focused on one example of CP violation and estimated the luminosity required to measure it using different techniques. We will briefly describe the requirements for detectors matched to these techniques. In particular, we will give a conceptual design of a possible detector for asymmetric collisions at the {Upsilon}(4S) resonance, one of the attractive techniques which will emerge from this study. A discussion of accelerator technology issues for using these techniques forms the second half of the B-factory Group report, and it follows in these proceedings. 34 refs., 2 figs., 2 tabs.« less

We report the first observation of the decay D+ → ηeνe in two analyses, which combined provide a branching fraction of B(D+ → ηeνe) = (2.16 ± 0.53 ± 0.07) × 10−4. We also provide an improved measurement of B(D+ → ηeνe) = (11.4 ± 0.9 ± 0.4) × 10−4, provide the first form factor measurement, and set the improved upper limit B(D+ → φ eνe) < 0.9× 10−4 (90% C.L.). ∗ Now at: Pacific Northwest National Laboratory, Richland, WA 99352 † Now at: Rutgers University, Piscataway, New Jersey 08855, USA

The present report documents the results of Working Group 2: B, D andK decays, of the workshop on Flavour in the Era of the LHC, held a t CERN from November 2005 through March 2007. With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct dete ction of new particles will be the main avenue to establish the presence of NP at the L HC, indirect searches will provide precious complementary information , si ce most probably it will not be possible to measure the full spectrum of ne w particles and their couplings through direct production. In particular, p ecision measurements and computations in the realm of flavour physics are exp cted to play a key role in constraining the unknown parameters of the Lagra ngian of any NP model emerging from direct searches at the LHC. The aim of Working Group 2 was twofold: on one hand, to provide a coherent, up-to-date picture of the status of flavour physics befo re the start of the LHC; on the other hand, to initiate activities on the path tow ards integrating information on NP from highpT and flavour data. This report is organized as follows. In Sec. 1, we give an over view of NP models, focusing on a few examples that have been discussed i n some detail during the workshop, with a short description of the availab le computational tools for flavour observables in NP models. Sec. 2 contains a c oncise discussion of the main theoretical problem in flavour physics: t he evaluation of the relevant hadronic matrix elements for weak decays. Sec. 3 contains a detailed discussion of NP effects in a set of flavour observable s that we identified as “benchmark channels” for NP searches. The experimental p rospects for flavour physics at future facilities are discussed in Sec. 4. Finally, Sec. 5 contains some assessments on the work done at the workshop and th e prospects for future developments.

This is the story of a culture and its evolution and legacy. Beginning with the invention of the cyclotron at Berkeley, the path of further accelerator development at Cornell via the Los Alamos experience of the primary actors is described. The science done with the accelerators and on the accelerators and beams themselves is reviewed and brought up to the current time. The evolution of the user community and the sources of support for accelerators and science done with them are discussed at the appropriate places in the story.

This is the story of a culture and its evolution and legacy. Beginning with the invention of the cyclotron at Berkeley, the path of further accelerator development at Cornell via the Los Alamos experience of the primary actors is described. The science done with the accelerators and on the accelerators and beams themselves is reviewed and brought up to the current time. The evolution of the user community and the sources of support for accelerators and science done with them are discussed at the appropriate places in the story.

Updated measurements of absolute D+ and D0 hadronic branching fractions and σ(e+e⁻→DD¯) at Ecm=3774 MeV

Utilizing the full CLEO-c data sample of 818 pb(-1) of e(+)e(-) data taken at the psi(3770) resonance, we update our measurements of absolute hadronic branching fractions of charged and neutral D mesons. We previously reported results from subsets of these data. Using a double tag technique we obtain branching fractions for three D-0 and six D+ modes, including the reference branching fractions B(D-0 -> K-pi(+)) = (3.934 +/- 0.021 +/- 0.061)% and B(D+ -> K-pi(+)pi(+)) = (9.224 +/- 0.059 +/- 0.157)%. The uncertainties are statistical and systematic, respectively. In these measurements we include the effects of final-state radiation by allowing for additional unobserved photons in the final state, and the systematic errors include our estimates of the uncertainties of these effects. Furthermore, using an independent measurement of the luminosity, we obtain the cross sections sigma(e(+)e(-) -> D-0 (D) over bar (0)) = (3.607 +/- 0.017 +/- 0.056) nb and sigma(e(+)e(-) -> D+D-) = (2.882 +/- 0.018 +/- 0.042) nb at a center of mass energy, E-cm = 3774 +/- 1 MeV.

A large, sophist icated detec tor based on the new technique known as the T ime Project ion Chamber (TPC) has been chosen as one of the f irst ex­ per imenta l faci l i t ies for the e lect ronposi t ron machine, PEP. This detector , whose cost is 10 mil l ion dol lars, is be­ ing built at Berkeley and wi l l be ready for PEP in late 1979 or early 1 9 8 0 . The central e lement is the TPC, developed at LBL by David Nygren and coworkers , wh ich can provide excel­ lent pat tern recognit ion and charged part icle ident i f icat ion of electrons, pions, kaons and protons over large sol id angles, even in high mul t ip l ic i ty events. In addi t ion, a mul t ip la te l iquid argon calor imeter measures the energy and direct ion of g a m m a rays, and muons are ident i f ied by their penetrat ion of an iron hadron absorber. The detector wi l l thus have excep­ t ional ly broad sensit ivi ty in the search ^for new phenomena opened up by the higher energy of PEP. The TPC is a large vo lume cyl indrical drif t chamber (2 m long, 2 m diameter) wh i ch provides three d imensional spatial data, by using proport ional w i res to read out the t w o coordinates or thogonal to the dri f t d i rect ion, and t im ing in format ion to determine pos i ­ t ions along the drift d i rect ion. It covers about 9 5 % of 4 n steradians solid angle, sits in a 1.5T solenoidal magnet ic f ie ld, and is f i l led w i t h a mix­ ture of 8 0 % argon and 2 0 % methane at a pressure of up to 10 atmospheres. An electric f ield of 1 5 k V / m is generated in each half of the cyl inder, parallel to the magnet ic f ie ld. Charged part icles wh ich traverse the cyl inder ionize the gas a long their t rajector ies and the ionization electrons drift t owards sense wi res in the endcaps. The drif t t ime f rom the posi t ion where the electrons are l iberated to the w i res is measured and, using the known dri f t veloci ty (about 7 cm/us) , the coordinates of up to 192 points on the t ra jectory (there are 192 sense wires) can be calculated, each w i t h a resolut ion of 2 m m . This can be done for many densely spaced trajectories in the chamber, because the drift t ime to a sense w i re is measured w i t h a charge coupled device — an analogue shift register that can store the pulse height in format ion f rom up to 4 5 5 hits on each w i re , thus effectively div id ing up the vo lume of the TPC into many small subvolumes. Since 192 good points are measured for most trajector ies, it should be easy to sort out all the tracks in a complex jetl ike mul t ihadronic event, even w i t h synchrotron radiat ion or beam induced background present. Twelve of the radially spaced sense w i res in each endcap have the cathode plane locally segmented into square pads (8 m m x 8 mm) under each wi re . A schematic representation of the Time Projection Chamber which is being developed at Berkeley for use on the PEP colliding beams. Electrons, liberated in the cylindrical drift chamber volume by the passage of charged particles, drift to end-cap wires and the signals which are picked up can be interpreted to give spatial and time coordinates and provide particle identification.

Utilizing the full CLEO-c data sample of 818 pb^-1 of e^+e^- data taken at the ψ(3770) resonance, we update our measurements of absolute hadronic branching fractions of charged and neutral D mesons. We previously reportedresults from subsets of these data. Using a double tag technique we obtain branching fractions for three D^0 and six D^+ modes, including the reference branching fractions ℬ (D^0→ K^-π^+)=(3.934 ± 0.021 ± 0.061)% and ℬ (D^+ → K^- π^+π^+)=(9.224 ± 0.059 ± 0.157)%. The uncertainties are statistical and systematic, respectively. In these measurements we include the effects of final-state radiation by allowing for additional unobserved photons in the final state, and the systematic errors include our estimates of the uncertainties of these effects. Furthermore, using an independent measurement of the luminosity, we obtain the cross sections σ(e^+e^-→ D^0D^0)=(3.607± 0.017 ± 0.056) nb and σ(e^+e^-→ D^+D^-)=(2.882± 0.018 ± 0.042) nb at a center of mass energy, E_cm = 3774 ± 1 MeV.

P. Naik, J. Rademacker, D. M. Asner, K. W. Edwards, J. Reed, A. N. Robichaud, G. Tatishvili, R. A. Briere, H. Vogel, P. U. E. Onyisi, J. L. Rosner, J. P. Alexander, D. G. Cassel, J. E. Duboscq, R. Ehrlich, L. Fields, R. S. Galik, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, J. M. Hunt, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, J. Ledoux, H. MahlkeKruger, D. Mohapatra, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, S. Stroiney, W. M. Sun, T. Wilksen, S. B. Athar, J. Yelton, P. Rubin, S. Mehrabyan, N. Lowrey, M. Selen, E. J. White, J. Wiss, R. E. Mitchell, M. R. Shepherd, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, J. Hietala, Y. Kubota, T. Klein, R. Poling, A. W. Scott, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, B. J. Y. Tan, A. Tomaradze, J. Libby, L. Martin, A. Powell, G. Wilkinson, H. Mendez, J. Y. Ge, D. H. Miller, V. Pavlunin, B. Sanghi, I. P. J. Shipsey, B. Xin, G. S. Adams, D. Hu, B. Moziak, J. Napolitano, Q. He, J. Insler, H. Muramatsu, C. S. Park, E. H. Thorndike, F. Yang, M. Artuso, S. Blusk, S. Khalil, J. Li, R. Mountain, K. Randrianarivony, N. Sultana, T. Skwarnicki, S. Stone, J. C. Wang, L. M. Zhang, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, and K. M. Ecklund

The beauty to up quark coupling constant |V(ub)| can be extracted from B → ρ e+ ν(e) combined with the form factors for D → K* e+ ν(e) and B → V ℓ+ ℓ- and D → ρ e+ ν(e). Using the entire CLEO-c ψ(3770) → DD event sample, corresponding to an integrated luminosity of 818  pb(-1) and approximately 5.4×10(6) DD events, we measure the form factors for the decays D0 → ρ- e+ ν(e) and D+ → ρ0 e+ ν(e) for the first time and the branching fractions with improved precision. A four-dimensional unbinned maximum likelihood fit determines the form factor ratios to be V(0)/A1(0)=1.48±0.15±0.05 and A2(0)/A1(0)=0.83±0.11±0.04. Assuming Cabibbo-Kobayashi-Maskawa unitarity, the known D meson lifetimes, and our measured branching fractions we obtain the form factor normalizations A1(0), A2(0), and V(0). We also present a measurement of the branching fraction for D+ → ω e+ ν(e) with improved precision.

J. P. Alexander, D. G. Cassel, J. E. Duboscq, R. Ehrlich, L. Fields, R. S. Galik, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, J. M. Hunt, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, J. Ledoux, H. MahlkeKruger, D. Mohapatra, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, S. Stroiney, W. M. Sun, T. Wilksen, J. Yelton, P. Rubin, N. Lowrey, S. Mehrabyan, M. Selen, J. Wiss, R. E. Mitchell, M. R. Shepherd, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, J. Hietala, Y. Kubota, T. Klein, R. Poling, A. W. Scott, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, B. J. Y. Tan, A. Tomaradze, J. Libby, L. Martin, A. Powell, G. Wilkinson, H. Mendez, J. Y. Ge, D. H. Miller, V. Pavlunin, B. Sanghi, I. P. J. Shipsey, B. Xin, G. S. Adams, D. Hu, B. Moziak, J. Napolitano, K. M. Ecklund, Q. He, J. Insler, H. Muramatsu, C. S. Park, E. H. Thorndike, F. Yang, M. Artuso, S. Blusk, S. Khalil, J. Li, R. Mountain, K. Randrianarivony, N. Sultana, T. Skwarnicki, S. Stone, J. C. Wang, L. M. Zhang, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, M. J. Smith, P. Naik, J. Rademacker, D. M. Asner, K. W. Edwards, J. Reed, A. N. Robichaud, G. Tatishvili, E. J. White, R. A. Briere, H. Vogel, P. U. E. Onyisi, and J. L. Rosner

D. Besson, D. P. Hogan, T. K. Pedlar, D. Cronin-Hennessy, J. Hietala, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, T. Xiao, S. Brisbane, L. Martin, A. Powell, P. Spradlin, G. Wilkinson, H. Mendez, J. Y. Ge, D. H. Miller, I. P. J. Shipsey, B. Xin, G. S. Adams, D. Hu, B. Moziak, J. Napolitano, K. M. Ecklund, J. Insler, H. Muramatsu, C. S. Park, L. J. Pearson, E. H. Thorndike, F. Yang, S. Ricciardi, C. Thomas, M. Artuso, S. Blusk, R. Mountain, T. Skwarnicki, S. Stone, J. C. Wang, L. M. Zhang, G. Bonvicini, D. Cinabro, A. Lincoln, M. J. Smith, P. Zhou, J. Zhu, P. Naik, J. Rademacker, D. M. Asner, K. W. Edwards, K. Randrianarivony, G. Tatishvili, R. A. Briere, H. Vogel, P. U. E. Onyisi, J. L. Rosner, J. P. Alexander, D. G. Cassel, S. Das, R. Ehrlich, L. Fields, L. Gibbons, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. L. Kreinick, V. E. Kuznetsov, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, W. M. Sun, J. Yelton, P. Rubin, N. Lowrey, S. Mehrabyan, M. Selen, J. Wiss, J. Libby, M. Kornicer, R. E. Mitchell, and C. M. Tarbert