Measurement of resonance parameters of orbitally excited narrow B0 mesons

We report a measurement of resonance parameters of the orbitally excited (L=1) narrow B0 mesons in decays to B(*)+Ï€- using 1.7fb-1 of data collected by the CDF II detector at the Fermilab Tevatron. The mass and width of the B2*0 state are measured to be m(B2*0)=5740.2-1.8+1. 7(stat)-0.8+0.9(syst)MeV/c2 and Î (B2*0)=22.7-3.2+3.8(stat)-10. 2+3.2(syst)MeV/c2. The mass difference between the B2*0 and B10 states is measured to be 14.9-2.5+2.2(stat)-1.4+1.2(syst)MeV/c2, resulting in a B10 mass of 5725.3-2.2+1.6(stat)-1.5+1.4(syst)MeV/c2. This is currently the most precise measurement of the masses of these states and the first measurement of the B2*0 width. © 2009 The American Physical Society

Hyponatremia and hospital outcomes among patients with pneumonia: a retrospective cohort study

<p>Abstract</p> <p>Background</p> <p>Community-acquired (CAP) and nosocomial pneumonias contribute substantially to morbidity and hospital resource utilization. Hyponatremia, occurring in >1/4 of patients with CAP, is associated with greater disease severity and worsened outcomes.</p> <p>Methods</p> <p>To explore how hyponatremia is associated with outcomes in hospitalized patients with pneumonia, we analyzed a large administrative database with laboratory component from January 2004 to December 2005. Hyponatremia was defined as at least two [Na⁺] < 135 mEq/L within 24 hours of admission value.</p> <p>Results</p> <p>Of 7,965 patients with pneumonia, 649 (8.1%) with hyponatremia were older (72.4 ± 15.7 vs. 68.0 ± 22.0, p < 0.01), had a higher mean Deyo-Charlson Comorbidity Index Score (1.7 ± 1.7 vs. 1.6 ± 1.6, p = 0.02), and higher rates of ICU (10.0% vs. 6.3%, p < 0.001) and MV (3.9% vs. 2.3%, p = 0.01) in the first 48 hours of hospitalization than patients with normal sodium. Hyponatremia was associated with an increased ICU (6.3 ± 5.6 vs. 5.3 ± 5.1 days, p = 0.07) and hospital lengths of stay (LOS, 7.6 ± 5.3 vs. 7.0 ± 5.2 days, p < 0.001) and a trend toward increased hospital mortality (5.4% vs. 4.0%, p = 0.1). After adjusting for confounders, hyponatremia was associated with an increased risk of ICU (OR 1.58, 95% CI 1.20–2.08), MV (OR 1.75 95% CI 1.13–2.69), and hospital death (OR 1.3, 95% CI 0.90–1.87) and with increases of 0.8 day to ICU and 0.3 day to hospital LOS, and over $1,300 to total hospital costs.</p> <p>Conclusion</p> <p>Hyponatremia is common among hospitalized patients with pneumonia and is associated with worsened clinical and economic outcomes. Studies in this large population are needed to explore whether prompt correction of [Na⁺] may impact these outcomes.</p

Measurement of the top quark mass at CDF using the `neutrino phi weighting' template method on a lepton plus isolated track sample

We present a measurement of the top quark mass with t{bar t} dilepton events produced in p{bar p} collisions at the Fermilab Tevatron ({radical}s = 1.96 TeV) and collected by the CDF II detector. A sample of 328 events with a charged electron or muon and an isolated track, corresponding to an integrated luminosity of 2.9 fb{sup -1}, are selected as t{bar t} candidates. To account for the unconstrained event kinematics, we scan over the phase space of the azimuthal angles ({phi}{sub {nu}1}, {phi}{sub {nu}2}) of neutrinos and reconstruct the top quark mass for each {phi}{sub {nu}1}, {phi}{sub {nu}2} pair by minimizing a {chi}{sup 2} function in the t{bar t} dilepton hypothesis. We assign {chi}{sup 2}-dependent weights to the solutions in order to build a preferred mass for each event. Preferred mass distributions (templates) are built from simulated t{bar t} and background events, and parameterized in order to provide continuous probability density functions. A likelihood fit to the mass distribution in data as a weighted sum of signal and background probability density functions gives a top quark mass of 165.5{sub -3.3}{sup +3.4}(stat.){+-}3.1(syst.) GeV/c{sup 2}

Search for new physics in the mu mu+e/mu + is not an element of T channel with a low-pT lepton threshold at the Collider Detector at Fermilab

A search for new physics using three-lepton (trilepton) data collected with the CDF II detector and corresponding to an integrated luminosity of 976 pb(-1) is presented. The standard model predicts a low rate of trilepton events, which makes some supersymmetric processes, such as chargino-neutralino production, measurable in this channel. The mu mu + l signature is investigated, where l is an electron or a muon, with the additional requirement of large missing transverse energy. In this analysis, the lepton transverse momenta with respect to the beam direction (p(T)) are as low as 5 GeV/c, a selection that improves the sensitivity to particles that are light as well as to ones that result in leptonically decaying tau leptons. At the same time, this low-p(T) selection presents additional challenges due to the non-negligible heavy-quark background at low lepton momenta. This background is measured with an innovative technique using experimental data. Several dimuon and trilepton control regions are investigated, and good agreement between experimental results and standard-model predictions is observed. In the signal region, we observe one three-muon event and expect 0.4 +/- 0.1 mu mu + l events from standard-model processes.We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A.P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean Science and Engineering Foundation and the Korean Research Foundation; the Science and Technology Facilities Council and the Royal Society, UK; the Institut National de Physique Nucleaire et Physique des Particules/CNRS; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; and the Academy of Finland.Peer reviewe

Measurement of the top-quark mass with dilepton events selected using neuroevolution at CDF

We report a measurement of the top-quark mass Mt in the dilepton decay channel tt̄→bl′+νl′b̄l-ν̄l. Events are selected with a neural network which has been directly optimized for statistical precision in top-quark mass using neuroevolution, a technique modeled on biological evolution. The top-quark mass is extracted from per-event probability densities that are formed by the convolution of leading order matrix elements and detector resolution functions. The joint probability is the product of the probability densities from 344 candidate events in 2.0fb-1 of pp̄ collisions collected with the CDF II detector, yielding a measurement of Mt=171.2±2.7(stat)±2.9(syst)GeV/c2. © 2009 The American Physical Society

Mortality and pulmonary complications in patients undergoing surgery with perioperative SARS-CoV-2 infection: an international cohort study

Background: The impact of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on postoperative recovery needs to be understood to inform clinical decision making during and after the COVID-19 pandemic. This study reports 30-day mortality and pulmonary complication rates in patients with perioperative SARS-CoV-2 infection. Methods: This international, multicentre, cohort study at 235 hospitals in 24 countries included all patients undergoing surgery who had SARS-CoV-2 infection confirmed within 7 days before or 30 days after surgery. The primary outcome measure was 30-day postoperative mortality and was assessed in all enrolled patients. The main secondary outcome measure was pulmonary complications, defined as pneumonia, acute respiratory distress syndrome, or unexpected postoperative ventilation. Findings: This analysis includes 1128 patients who had surgery between Jan 1 and March 31, 2020, of whom 835 (74·0%) had emergency surgery and 280 (24·8%) had elective surgery. SARS-CoV-2 infection was confirmed preoperatively in 294 (26·1%) patients. 30-day mortality was 23·8% (268 of 1128). Pulmonary complications occurred in 577 (51·2%) of 1128 patients; 30-day mortality in these patients was 38·0% (219 of 577), accounting for 81·7% (219 of 268) of all deaths. In adjusted analyses, 30-day mortality was associated with male sex (odds ratio 1·75 [95% CI 1·28–2·40], p\textless0·0001), age 70 years or older versus younger than 70 years (2·30 [1·65–3·22], p\textless0·0001), American Society of Anesthesiologists grades 3–5 versus grades 1–2 (2·35 [1·57–3·53], p\textless0·0001), malignant versus benign or obstetric diagnosis (1·55 [1·01–2·39], p=0·046), emergency versus elective surgery (1·67 [1·06–2·63], p=0·026), and major versus minor surgery (1·52 [1·01–2·31], p=0·047). Interpretation: Postoperative pulmonary complications occur in half of patients with perioperative SARS-CoV-2 infection and are associated with high mortality. Thresholds for surgery during the COVID-19 pandemic should be higher than during normal practice, particularly in men aged 70 years and older. Consideration should be given for postponing non-urgent procedures and promoting non-operative treatment to delay or avoid the need for surgery. Funding: National Institute for Health Research (NIHR), Association of Coloproctology of Great Britain and Ireland, Bowel and Cancer Research, Bowel Disease Research Foundation, Association of Upper Gastrointestinal Surgeons, British Association of Surgical Oncology, British Gynaecological Cancer Society, European Society of Coloproctology, NIHR Academy, Sarcoma UK, Vascular Society for Great Britain and Ireland, and Yorkshire Cancer Research

Direct Bound on the Total Decay Width of the Top Quark in p(p)over-bar Collisions at root s=1.96 TeV

We present the first direct experimental bound on the total decay width of the top quark, Gamma(t), using 955 pb(-1) of the Tevatron's p (p) over bar collisions recorded by the Collider Detector at Fermilab. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from these events is fitted to templates representing different values of the top quark width. Using a confidence interval based on likelihood-ratio ordering, we extract an upper limit at 95\% C.L. of Gamma(t) < 13.1 GeV for an assumed top quark mass of 175 GeV/c(2)

Measurement of the fraction of tt¯ production via gluon-gluon fusion in pp¯ collisions at √s = 1.96 TeV

Aaltonen, T., Adelman, J., Akimoto, T., Albrow, M.G., Álvarez González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G., Apresyan, A., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Azzurri, P., Badgett, W., Barbaro-Galtieri, A., Barnes, V.E., Barnett, B.A., Bartsch, V., Bauer, G., Beauchemin, P.-H., Bedeschi, F., Bednar, P., Beecher, D., Behari, S., Bellettini, G., Bellinger, J., Benjamin, D., Beretvas, A., Beringer, J., Bhatti, A., Binkley, M., Bisello, D., Bizjak, I., Blair, R.E., Blocker, C., Blumenfeld, B., Bocci, A., Bodek, A., Boisvert, V., Bolla, G., Bortoletto, D., Boudreau, J., Boveia, A., Brau, B., Bridgeman, A., Brigliadori, L., Bromberg, C., Brubaker, E., Budagov, J., Budd, H.S., Budd, S., Burkett, K., Busetto, G., Bussey, P., Buzatu, A., Byrum, K.L., Cabrera, S., Calancha, C., Campanelli, M., Campbell, M., Canelli, F., Canepa, A., Carlsmith, D., Carosi, R., Carrillo, S., Carron, S., Casal, B., Casarsa, M., Castro, A., Catastini, P., Cauz, D., Cavaliere, V., Cavalli-Sforza, M., Cerri, A., Cerrito, L., Chang, S.H., Chen, Y.C., Chertok, M., Chiarelli, G., Chlachidze, G., Chlebana, F., Cho, K., Chokheli, D., Chou, J.P., Choudalakis, G., Chuang, S.H., Chung, K., Chung, W.H., Chung, Y.S., Ciobanu, C.I., Ciocci, M.A., Clark, A., Clark, D., Compostella, G., Convery, M.E., Conway, J., Copic, K., Cordelli, M., Cortiana, G., Cox, D.J., Crescioli, F., Cuenca Almenar, C., Cuevas, J., Culbertson, R., Cully, J.C., Dagenhart, D., Datta, M., Davies, T., De Barbaro, P., De Cecco, S., Deisher, A., De Lorenzo, G., Dell'Orso, M., Deluca, C., Demortier, L., Deng, J., Deninno, M., Derwent, P.F., Di Giovanni, G.P., Dionisi, C., Di Ruzza, B., Dittmann, J.R., D'Onofrio, M., Donati, S., Dong, P., Donini, J., Dorigo, T., Dube, S., Efron, J., Elagin, A., Erbacher, R., Errede, D., Errede, S., Eusebi, R., Fang, H.C., Farrington, S., Fedorko, W.T., Feild, R.G., Feindt, M., Fernandez, J.P., Ferrazza, C., Field, R., Flanagan, G., Forrest, R., Franklin, M., Freeman, J.C., Furic, I., Gallinaro, M., Galyardt, J., Garberson, F., Garcia, J.E., Garfinkel, A.F., Genser, K., Gerberich, H., Gerdes, D., Gessler, A., Giagu, S., Giakoumopoulou, V., Giannetti, P., Gibson, K., Gimmell, J.L., Ginsburg, C.M., Giokaris, N., Giordani, M., Giromini, P., Giunta, M., Giurgiu, G., Glagolev, V., Glenzinski, D., Gold, M., Goldschmidt, N., Golossanov, A., Gomez, G., Gomez-Ceballos, G., Goncharov, M., González, O., Gorelov, I., Goshaw, A.T., Goulianos, K., Gresele, A., Grinstein, S., Grosso-Pilcher, C., Group, R.C., Grundler, U., Guimaraes Da Costa, J., Gunay-Unalan, Z., Haber, C., Hahn, K., Hahn, S.R., Halkiadakis, E., Han, B.-Y., Han, J.Y., Handler, R., Happacher, F., Hara, K., Hare, D., Hare, M., Harper, S., Harr, R.F., Harris, R.M., Hartz, M., Hatakeyama, K., Hauser, J., Hays, C., Heck, M., Heijboer, A., Heinemann, B., Heinrich, J., Henderson, C., Herndon, M., Heuser, J., Hewamanage, S., Hidas, D., Hill, C.S., Hirschbuehl, D., Hocker, A., Hou, S., Houlden, M., Hsu, S.-C., Huffman, B.T., Hughes, R.E., Husemann, U., Huston, J., Incandela, J., Introzzi, G., Iori, M., Ivanov, A., James, E., Jayatilaka, B., Jeon, E.J., Jha, M.K., Jindariani, S., Johnson, W., Jones, M., Joo, K.K., Jun, S.Y., Jung, J.E., Junk, T.R., Kamon, T., Kar, D., Karchin, P.E., Kato, Y., Kephart, R., Keung, J., Khotilovich, V., Kilminster, B., Kim, D.H., Kim, H.S., Kim, J.E., Kim, M.J., Kim, S.B., Kim, S.H., Kim, Y.K., Kimura, N., Kirsch, L., Klimenko, S., Knuteson, B., Ko, B.R., Koay, S.A., Kondo, K., Kong, D.J., Konigsberg, J., Korytov, A., Kotwal, A.V., Kreps, M., Kroll, J., Krop, D., Krumnack, N., Kruse, M., Krutelyov, V., Kubo, T., Kuhr, T., Kulkarni, N.P., Kurata, M., Kusakabe, Y., Kwang, S., Laasanen, A.T., Lami, S., Lammel, S., Lancaster, M., Lander, R.L., Lannon, K., Lath, A., Latino, G., Lazzizzera, I., Lecompte, T., Lee, E., Lee, S.W., Leone, S., Lewis, J.D., Lin, C.S., Linacre, J., Lindgren, M., Lipeles, E., Lister, A., Litvintsev, D.O., Liu, C., Liu, T., Lockyer, N.S., Loginov, A., Loreti, M., Lovas, L., Lu, R.-S., Lucchesi, D., Lueck, J., Luci, C., Lujan, P., Lukens, P., Lungu, G., Lyons, L., Lys, J., Lysak, R., Lytken, E., MacK, P., MacQueen, D., Madrak, R., Maeshima, K., Makhoul, K., Maki, T., Maksimovic, P., Malde, S., Malik, S., Manca, G., Manousakis-Katsikakis, A., Margaroli, F., Marino, C., Marino, C.P., Martin, A., Martin, V., Martínez, M., Martínez-Ballarín, R., Maruyama, T., Mastrandrea, P., Masubuchi, T., Mattson, M.E., Mazzanti, P., McFarland, K.S., McIntyre, P., McNulty, R., Mehta, A., Mehtala, P., Menzione, A., Merkel, P., Mesropian, C., Miao, T., Miladinovic, N., Miller, R., Mills, C., Milnik, M., Mitra, A., Mitselmakher, G., Miyake, H., Moggi, N., Moon, C.S., Moore, R., Morello, M.J., Morlok, J., Movilla Fernandez, P., Mülmenstädt, J., Mukherjee, A., Muller, T., Mumford, R., Murat, P., Mussini, M., Nachtman, J., Nagai, Y., Nagano, A., Naganoma, J., Nakamura, K., Nakano, I., Napier, A., Necula, V., Neu, C., Neubauer, M.S., Nielsen, J., Nodulman, L., Norman, M., Norniella, O., Nurse, E., Oakes, L., Oh, S.H., Oh, Y.D., Oksuzian, I., Okusawa, T., Orava, R., Osterberg, K., Pagan Griso, S., Pagliarone, C., Palencia, E., Papadimitriou, V., Papaikonomou, A., Paramonov, A.A., Parks, B., Pashapour, S., Patrick, J., Pauletta, G., Paulini, M., Paus, C., Pellett, D.E., Penzo, A., Phillips, T.J., Piacentino, G., Pianori, E., Pinera, L., Pitts, K., Plager, C., Pondrom, L., Poukhov, O., Pounder, N., Prakoshyn, F., Pronko, A., Proudfoot, J., Ptohos, F., Pueschel, E., Punzi, G., Pursley, J., Rademacker, J., Rahaman, A., Ramakrishnan, V., Ranjan, N., Redondo, I., Reisert, B., Rekovic, V., Renton, P., Rescigno, M., Richter, S., Rimondi, F., Ristori, L., Robson, A., Rodrigo, T., Rodriguez, T., Rogers, E., Rolli, S., Roser, R., Rossi, M., Rossin, R., Roy, P., Ruiz, A., Russ, J., Rusu, V., Saarikko, H., Safonov, A., Sakumoto, W.K., Saltó, O., Santi, L., Sarkar, S., Sartori, L., Sato, K., Savoy-Navarro, A., Scheidle, T., Schlabach, P., Schmidt, A., Schmidt, E.E., Schmidt, M.A., Schmidt, M.P., Schmitt, M., Schwarz, T., Scodellaro, L., Scott, A.L., Scribano, A., Scuri, F., Sedov, A., Seidel, S., Seiya, Y., Semenov, A., Sexton-Kennedy, L., Sfyrla, A., Shalhout, S.Z., Shears, T., Shepard, P.F., Sherman, D., Shimojima, M., Shiraishi, S., Shochet, M., Shon, Y., Shreyber, I., Sidoti, A., Sinervo, P., Sisakyan, A., Slaughter, A.J., Slaunwhite, J., Sliwa, K., Smith, J.R., Snider, F.D., Snihur, R., Soha, A., Somalwar, S., Sorin, V., Spalding, J., Spreitzer, T., Squillacioti, P., Stanitzki, M., St. Denis, R., Stelzer, B., Stelzer-Chilton, O., Stentz, D., Strologas, J., Stuart, D., Suh, J.S., Sukhanov, A., Suslov, I., Suzuki, T., Taffard, A., Takashima, R., Takeuchi, Y., Tanaka, R., Tecchio, M., Teng, P.K., Terashi, K., Thom, J., Thompson, A.S., Thompson, G.A., Thomson, E., Tipton, P., Tiwari, V., Tkaczyk, S., Toback, D., Tokar, S., Tollefson, K., Tomura, T., Tonelli, D., Torre, S., Torretta, D., Totaro, P., Tourneur, S., Tu, Y., Turini, N., Ukegawa, F., Vallecorsa, S., Van Remortel, N., Varganov, A., Vataga, E., Vázquez, F., Velev, G., Vellidis, C., Veszpremi, V., Vidal, M., Vidal, R., Vila, I., Vilar, R., Vine, T., Vogel, M., Volobouev, I., Volpi, G., Würthwein, F., Wagner, P., Wagner, R.G., Wagner, R.L., Wagner-Kuhr, J., Wagner, W., Wakisaka, T., Wallny, R., Wang, S.M., Warburton, A., Waters, D., Weinberger, M., Wester, W.C., Whitehouse, B., Whiteson, D., Wicklund, A.B., Wicklund, E., Williams, G., Williams, H.H., Wilson, P., Winer, B.L., Wittich, P., Wolbers, S., Wolfe, C., Wright, T., Wu, X., Wynne, S.M., Xie, S., Yagil, A., Yamamoto, K., Yamaoka, J., Yang, U.K., Yang, Y.C., Yao, W.M., Yeh, G.P., Yoh, J., Yorita, K., Yoshida, T., Yu, G.B., Yu, I., Yu, S.S., Yun, J.C., Zanello, L., Zanetti, A., Zaw, I., Zhang, X., Zheng, Y., Zucchelli, S

Search for high-mass resonances decaying to dimuons at CDF.

We present a search for high-mass neutral resonances using dimuon data corresponding to an integrated luminosity of 2.3 fb(-1) collected in pp[over ] collisions at sqrt[s]=1.96 TeV by the CDF II detector at the Fermilab Tevatron. No significant excess above the standard model expectation is observed in the dimuon invariant-mass spectrum. We set 95% confidence level upper limits on sigmaBR(pp-->X-->micromicro), where X is a boson with spin-0, 1, or 2. Using these cross section limits, we determine lower mass limits on sneutrinos in R-parity-violating supersymmetric models, Z' bosons, and Kaluza-Klein gravitons in the Randall-Sundrum model