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Search Results: 1 - 10 of 507537 matches for " E. M. Kabu? "
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Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q**2=0.22 (GeV/c)**2
S. Baunack,K. Aulenbacher,D. Balaguer Ríos,L. Capozza,J. Diefenbach,B. Gl?ser,D. v. Harrach,Y. Imai,E. M. Kabu,R. Kothe,J. H. Lee,H. Merkel,M. C. Mora Espí,U. Müller,E. Schilling,G. Stephan,C. Weinrich,J. Arvieux,M. A. El-Yakoubi,R. Kunne,F. E. Maas,M. Morlet,S. Ong,J. van de Wiele,S. Kowalski,Y. Prok,S. Taylor
Physics , 2009, DOI: 10.1103/PhysRevLett.102.151803
Abstract: A new measurement of the parity violating asymmetry in elastic electron scattering on hydrogen at backward angles and at a four momentum transfer of Q^2=0.22 (GeV/c)^2 is reported here. The measured asymmetry is A_LR=(-17.23 +- 0.82_stat +-0.89_syst) ppm. The Standard Model prediction assuming no strangeness is A_0=(-15.87 +- 1.22) ppm. In combination with previous results from measurements at forward angles, it it possible to disentangle for the first time the strange electric and magnetic form factors at this momentum transfer, G_E^s(0.22)=0.050 +- 0.038 +- 0.019 and G_M^s(0.22)=-0.14 +- 0.11 +- 0.11.
Evidence for Strange Quark Contributions to the Nucleon's Form Factors at $Q^2$ = 0.108 (GeV/c)$^2$
F. E. Maas,K. Aulenbacher,S. Baunack,L. Capozza,J. Diefenbach,B. Gl?ser,T. Hammel,D. von Harrach,Y. Imai,E. -M. Kabu,R. Kothe,J. H. Lee,A. Lorente,E. Schilling,D. Schwaab,M. Sikora,G. Stephan,G. Weber,C. Weinrich,I. Altarev,J. Arvieux,M. El-Yakoubi,R. Frascaria,R. Kunne,M. Morlet,S. Ong,J. van de Wiele,S. Kowalski,B. Plaster,R. Suleiman,S. Taylor
Physics , 2004, DOI: 10.1103/PhysRevLett.94.152001
Abstract: We report on a measurement of the parity violating asymmetry in the elastic scattering of polarized electrons off unpolarized protons with the A4 apparatus at MAMI in Mainz at a four momentum transfer value of $Q^2$ = \Qsquare (GeV/c)$^2$ and at a forward electron scattering angle of 30$^\circ < \theta_e < 40^\circ$. The measured asymmetry is $A_{LR}(\vec{e}p)$ = (\Aphys $\pm$ \Deltastat$_{stat}$ $\pm$ \Deltasyst$_{syst}$) $\times$ 10$^{-6}$. The expectation from the Standard Model assuming no strangeness contribution to the vector current is A$_0$ = (\Azero $\pm$ \DeltaAzero) $\times$ 10$^{-6}$. We have improved the statistical accuracy by a factor of 3 as compared to our previous measurements at a higher $Q^2$. We have extracted the strangeness contribution to the electromagnetic form factors from our data to be $G_E^s$ + \FakGMs $G_M^s$ = \GEsGMs $\pm $ \DeltaGEsGMs at $Q^2$ = \Qsquare (GeV/c)$^2$. As in our previous measurement at higher momentum transfer for $G_E^s$ + 0.230 $G_M^s$, we again find the value for $G_E^s$ + \FakGMs $G_M^s$ to be positive, this time at an improved significance level of 2 $\sigma$.
Clinical, Haematological, Serum Biochemical and Cytogenetic Study in Cows with Primary Ketosis
Bülent Elitok, Mustafa Solak1, Mustafa Kabu, ?zgül M. Elitok2, Zafer S?ylemez1 and Tevhide F?st?k1
Pakistan Veterinary Journal , 2010,
Abstract: Twenty four Anatolian Black cows with primary ketosis (PK) and 10 clinically healthy cows (considered as control) were used in the study. The clinical, haematological, serum biochemical and cytogenetical parameters of all the animals were measured. Primary clinical signs included diminished appetite, decreased milk production, loss of weight, firm faeces and depression. Although no significant differences were seen with regard to haematological findings between PK and the control groups, significance increases (P<0.05) in aspartate aminotransferase (AST), gamma-glutamyl transpeptidase (GGT) and urea concen- trations were observed in PK group compared to the control group. Glucose concentration was significantly low and reversely correlated to ketone bodies in urine in the PK group, but it was within normal limits in the control group. GTL- banded karyotypes of the animals were obtained using the standard karyotype of Bos taurus. Chromosomal complements were 2n = 60 in Anatolian Black cattle of normal and diseased groups. In the light of these molecular cytogenetic data, it was detected that all the autosomal chromosomes were acrocentric and gonosomal chromosomes were submetacentric. The results of the study showed that no morphological differences occurred in chromosomes in cattle suffering from PK.
Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_T$
COMPASS Collaboration,C. Adolph,R. Akhunzyanov,M. G. Alexeev,G. D. Alexeev,A. Amoroso,V. Andrieux,V. Anosov,W. Augustyniak,A. Austregesilo,C. D. R. Azevedo,B. Bade?ek,F. Balestra,J. Barth,R. Beck,Y. Bedfer,J. Bernhard,K. Bicker,E. R. Bielert,R. Birsa,J. Bisplinghoff,M. Bodlak,M. Boer,P. Bordalo,F. Bradamante,C. Braun,A. Bressan,M. Büchele,E. Burtin,W. -C. Chang,M. Chiosso,I. Choi,S. -U. Chung,A. Cicuttin,M. L. Crespo,Q. Curiel,S. Dalla Torre,S. S. Dasgupta,S. Dasgupta,O. Yu. Denisov,L. Dhara,S. V. Donskov,N. Doshita,V. Duic,W. Dünnweber,M. Dziewiecki,A. Efremov,P. D. Eversheim,W. Eyrich,M. Faessler,A. Ferrero,M. Finger,M. Finger jr.,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J. M. Friedrich,V. Frolov,E. Fuchey,F. Gautheron,O. P. Gavrichtchouk,S. Gerassimov,F. Giordano,I. Gnesi,M. Gorzellik,S. Grabmüller,A. Grasso,M. Grosse Perdekamp,B. Grube,T. Grussenmeyer,A. Guskov,F. Haas,D. Hahne,D. von Harrach,R. Hashimoto,F. H. Heinsius,F. Herrmann,F. Hinterberger,N. Horikawa,N. d'Hose,C. -Y. Hsieh,S. Huber,S. Ishimoto,A. Ivanov,Yu. Ivanshin,T. Iwata,R. Jahn,V. Jary,R. Joosten,P. J?rg,E. Kabu,B. Ketzer,G. V. Khaustov,Yu. A. Khokhlov,Yu. Kisselev,F. Klein,K. Klimaszewski,J. H. Koivuniemi,V. N. Kolosov,K. Kondo,K. K?nigsmann,I. Konorov,V. F. Konstantinov,A. M. Kotzinian,O. Kouznetsov,M. Kr?mer,P. Kremser,F. Krinner,Z. V. Kroumchtein,N. Kuchinski,R. Kuhn,F. Kunne,K. Kurek,R. P. Kurjata,A. A. Lednev,A. Lehmann,M. Levillain,S. Levorato,J. Lichtenstadt,R. Longo,A. Maggiora,A. Magnon
Physics , 2015,
Abstract: We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation $\Delta G$ inside the nucleon in the range of the nucleon momentum fraction carried by gluons $0.05 < x_g < 0.2$.
Resonance Production and $ππ$ S-wave in $π^- + p \rightarrow π^- π^- π^+ + p_{recoil}$ at 190 GeV/c
C. Adolph,R. Akhunzyanov,M. G. Alexeev,G. D. Alexeev,A. Amoroso,V. Andrieux,V. Anosov,W. Augustyniak,A. Austregesilo,C. D. R. Azevedo,B. Bade?ek,F. Balestra,J. Barth,R. Beck,Y. Bedfer,J. Bernhard,K. Bicker,E. R. Bielert,R. Birsa,J. Bisplinghoff,M. Bodlak,M. Boer,P. Bordalo,F. Bradamante,C. Braun,A. Bressan,M. Büchele,E. Burtin,W. -C. Chang,M. Chiosso,I. Choi,S. U. Chung,A. Cicuttin,M. L. Crespo,Q. Curiel,S. Dalla Torre,S. S. Dasgupta,S. Dasgupta,O. Yu. Denisov,L. Dhara,S. V. Donskov,N. Doshita,V. Duic,W. Dünnweber,M. Dziewiecki,A. Efremov,P. D. Eversheim,W. Eyrich,M. Faessler,A. Ferrero,M. Finger,M. Finger jr.,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J. M. Friedrich,V. Frolov,E. Fuchey,F. Gautheron,O. P. Gavrichtchouk,S. Gerassimov,F. Giordano,I. Gnesi,M. Gorzellik,S. Grabmüller,A. Grasso,M. Grosse Perdekamp,B. Grube,T. Grussenmeyer,A. Guskov,F. Haas,D. Hahne,D. von Harrach,R. Hashimoto,F. H. Heinsius,F. Herrmann,F. Hinterberger,N. Horikawa,N. d'Hose,C. -Y. Hsieh,S. Huber,S. Ishimoto,A. Ivanov,Yu. Ivanshin,T. Iwata,R. Jahn,V. Jary,R. Joosten,P. J?rg,E. Kabu,B. Ketzer,G. V. Khaustov,Yu. A. Khokhlov,Yu. Kisselev,F. Klein,K. Klimaszewski,J. H. Koivuniemi,V. N. Kolosov,K. Kondo,K. K?nigsmann,I. Konorov,V. F. Konstantinov,A. M. Kotzinian,O. Kouznetsov,M. Kr?mer,P. Kremser,F. Krinner,Z. V. Kroumchtein,N. Kuchinski,F. Kunne,K. Kurek,R. P. Kurjata,A. A. Lednev,A. Lehmann,M. Levillain,S. Levorato,J. Lichtenstadt,R. Longo,A. Maggiora,A. Magnon,N. Makins,N. Makke,G. K. Mallot
Physics , 2015,
Abstract: The COMPASS collaboration has collected the currently largest data set on diffractively produced $\pi^-\pi^-\pi^+$ final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, $0.5 < m_{3\pi} < 2.5$ GeV/c$^2$ , and in 11 bins of the reduced four-momentum transfer squared, $0.1 < t < 1.0$ (GeV/c)$^2$ . This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant $3\pi$ production. In this paper, we present detailed studies on selected $3\pi$ partial waves with $J^{PC} = 0^{-+}$, $1^{++}$, $2^{-+}$, $2^{++}$, and $4^{++}$. In these waves, we observe the well-known ground-state mesons as well as a new narrow axial-vector meson $a_1(1420)$ decaying into $f_0(980) \pi$. In addition, we present the results of a novel method to extract the amplitude of the $\pi^-\pi^+$ subsystem with $I^{G}J^{PC} = 0^+ 0^{++}$ in various partial waves from the $\pi^-\pi^-\pi^+$ data. Evidence is found for correlation of the $f_0(980)$ and $f_0(1500)$ appearing as intermediate $\pi^- \pi^+$ isobars in the decay of the known $\pi(1800)$ and $\pi_2(1880)$.
The Spin Structure Function $g_1^{\rm p}$ of the Proton and a Test of the Bjorken Sum Rule
C. Adolph,R. Akhunzyanov,M. G. Alexeev,G. D. Alexeev,A. Amoroso,V. Andrieux,V. Anosov,A. Austregesilo,C. Azevedo,B. Badelek,F. Balestra,J. Barth,G. Baum,G. R. Beck,Y. Bedfer,J. Bernhard,K. Bicker,E. R. Bielert,R. Birsa,J. Bisplinghoff,M. Bodlak,M. Boer,P. Bordalo,F. Bradamante,C. Braun,A. Bressan,M. Buechele,E. Burtin,L. Capozza,W. -C. Chang,M. Chiosso,I. Choi,S. U. Chung,A. Cicuttin,M. L. Crespo,Q. Curiel,S. Dalla Torre,S. S. Dasgupta,S. Dasgupta,O. Yu. Denisov,L. Dhara,S. V. Donskov,N. Doshita,V. Duic,M. Dziewiecki,A. Efremov,P. D. Eversheim,W. Eyrich,A. Ferrero,M. Finger,M. Finger jr.,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J. M. Friedrich,V. Frolov,E. Fuchey,F. Gautheron,O. P. Gavrichtchouk,S. Gerassimov,F. Giordano,I. Gnesi,M. Gorzellik,S. Grabmüller,A. Grasso,M. Grosse-Perdekamp,B. Grube,T. Grussenmeyer,A. Guskov,F. Haas,D. Hahne,D. von Harrach,R. Hashimoto,F. H. Heinsius,F. Herrmann,F. Hinterberger,N. Horikawa,N. d'Hose,C. -Yu Hsieh,S. Huber,S. Ishimoto,A. Ivanov,Yu. Ivanshin,T. Iwata,R. Jahn,V. Jary,P. J?rg,R. Joosten,E. Kabu,B. Ketzer,G. V. Khaustov,Yu. A. Khokhlov,Yu. Kisselev,F. Klein,K. Klimaszewski,J. H. Koivuniemi,V. N. Kolosov,K. Kondo,K. Koenigsmann,I. Konorov,V. F. Konstantinov,A. M. Kotzinian,O. Kouznetsov,M. Kraemer,P. Kremser,F. Krinner,Z. V. Kroumchtein,N. Kuchinski,F. Kunne,K. Kurek,R. P. Kurjata,A. A. Lednev,A. Lehmann,M. Levillain,S. Levorato,J. Lichtenstadt,R. Longo,A. Maggiora,A. Magnon,N. Makins,N. Makke,G. K. Mallot,C. Marchand,A. Martin
Physics , 2015,
Abstract: New results for the double spin asymmetry $A_1^{\rm p}$ and the proton longitudinal spin structure function $g_1^{\rm p}$ are presented. They were obtained by the COMPASS collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH$_3$ target. The data were collected in 2011 and complement those recorded in 2007 at 160\,GeV, in particular at lower values of $x$. They improve the statistical precision of $g_1^{\rm p}(x)$ by about a factor of two in the region $x\lesssim 0.02$. A next-to-leading order QCD fit to the $g_1$ world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, $\Delta \Sigma$ ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of $g_1^{\rm p}$. The uncertainty of $\Delta \Sigma$ is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function $g_1^{\rm NS}(x,Q^2)$ yields as ratio of the axial and vector coupling constants $|g_{\rm A}/g_{\rm V}| = 1.22 \pm 0.05~({\rm stat.}) \pm 0.10~({\rm syst.})$, which validates the sum rule to an accuracy of about 9\%.
Interplay among transversity induced asymmetries in hadron leptoproduction
Compass Collaboration,C. Adolph,R. Akhunzyanov,M. G. Alexeev,G. D. Alexeev,A. Amoroso,V. Andrieux,V. Anosov,W. Augustyniak,A. Austregesilo,C. D. R. Azevedo,B. Badelek,F. Balestra,J. Barth,R. Beck,Y. Bedfer,J. Bernhard,K. Bicker,E. R. Bielert,R. Birsa,J. Bisplinghoff,M. Bodlak,M. Boer,P. Bordalo,F. Bradamante,C. Braun,A. Bressan,M. Büchele,E. Burtin,W. -C. Chang,M. Chiosso,I. Choi,S. U. Chung,A. Cicuttin,M. L. Crespo,Q. Curiel,N. d'Hose,S. Dalla Torre,S. S. Dasgupta,S. Dasgupta,O. Yu. Denisov,L. Dhara,S. V. Donskov,N. Doshita,V. Duic,M. Dziewiecki,A. Efremov,C. Elia,P. D. Eversheim,W. Eyrich,A. Ferrero,M. Finger,M. Finger jr.,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J. M. Friedrich,V. Frolov,E. Fuchey,F. Gautheron,O. P. Gavrichtchouk,S. Gerassimov,F. Giordano,I. Gnesi,M. Gorzellik,S. Grabmüller,A. Grasso,M. Grosse-Perdekamp,B. Grube,T. Grussenmeyer,A. Guskov,F. Haas,D. Hahne,D. von Harrach,R. Hashimoto,F. H. Heinsius,F. Herrmann,F. Hinterberger,N. Horikawa,C. -Yu Hsieh,S. Huber,S. Ishimoto,A. Ivanov,Yu. Ivanshin,T. Iwata,R. Jahn,V. Jary,P. J?rg,R. Joosten,E. Kabu,B. Ketzer,G. V. Khaustov,Yu. A. Khokhlov,Yu. Kisselev,F. Klein,K. Klimaszewski,J. H. Koivuniemi,V. N. Kolosov,K. Kondo,K. K?nigsmann,I. Konorov,V. F. Konstantinov,A. M. Kotzinian,O. Kouznetsov,M. Kr?mer,P. Kremser,F. Krinner,Z. V. Kroumchtein,N. Kuchinski,F. Kunne,K. Kurek,R. P. Kurjata,A. A. Lednev,A. Lehmann,M. Levillain,S. Levorato,J. Lichtenstadt,R. Longo,A. Maggiora,A. Magnon,N. Makins,N. Makke
Physics , 2015, DOI: 10.1016/j.physletb.2015.12.042
Abstract: In the fragmentation of a transversely polarized quark several left-right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and di-hadron asymmetries is discussed. A new analysis of the data allows to establish quantitative relationships among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.
Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS
The COMPASS Collaboration,M. Alekseev,V. Yu. Alexakhin,Yu. Alexandrov,G. D. Alexeev,A. Amoroso,A. Arbuzov,B. Bade?ek,F. Balestra,J. Ball,J. Barth,G. Baum,Y. Bedfer,C. Bernet,R. Bertini,M. Bettinelli,R. Birsa,J. Bisplinghoff,P. Bordalo,F. Bradamante,A. Bravar,A. Bressan,G. Brona,E. Burtin,M. P. Bussa,A. Chapiro,M. Chiosso,A. Cicuttin,M. Colantoni,S. Costa,M. L. Crespo,S. Dalla Torre,T. Dafni,S. Das,S. S. Dasgupta,R. De Masi,N. Dedek,O. Yu. Denisov,L. Dhara,V. Diaz,A. M. Dinkelbach,S. V. Donskov,V. A. Dorofeev,N. Doshita,V. Duic,W. Dünnweber,P. D. Eversheim,A. V. Efremov,W. Eyrich,M. Faessler,V. Falaleev,A. Ferrero,L. Ferrero,M. Finger,M. Finger Jr.,H. Fischer,C. Franco,J. Franz,J. M. Friedrich,V. Frolov,R. Garfagnini,F. Gautheron,O. P. Gavrichtchouk,R. Gazda,S. Gerassimov,R. Geyer,M. Giorgi,B. Gobbo,S. Goertz,A. M. Gorin,S. Grabmüller,O. A. Grajek,A. Grasso,B. Grube,R. Gushterski,A. Guskov,F. Haas,J. Hannappel,D. von Harrach,T. Hasegawa,J. Heckmann,S. Hedicke,F. H. Heinsius,R. Hermann,C. He?,F. Hinterberger,M. von Hodenberg,N. Horikawa,S. Horikawa,N. d'Hose,C. Ilgner,A. I. Ioukaev,S. Ishimoto,O. Ivanov,Yu. Ivanshin,T. Iwata,R. Jahn,A. Janata,P. Jasinski,R. Joosten,N. I. Jouravlev,E. Kabu,D. Kang,B. Ketzer,G. V. Khaustov,Yu. A. Khokhlov,Yu. Kisselev,F. Klein,K. Klimaszewski,S. Koblitz,J. H. Koivuniemi,V. N. Kolosov,E. V. Komissarov,K. Kondo,K. K?nigsmann,I. Konorov,V. F. Konstantinov,A. S. Korentchenko,A. Korzenev,A. M. Kotzinian,N. A. Koutchinski,O. Kouznetsov,A. Kral
Physics , 2008, DOI: 10.1016/j.physletb.2009.01.060
Abstract: The measurements of the Collins and Sivers asymmetries of identified hadrons produced in deep-inelastic scattering of 160 GeV/c muons on a transversely polarised 6LiD target at COMPASS are presented. The results for charged pions and charged and neutral kaons correspond to all data available, which were collected from 2002 to 2004. For all final state particles both the Collins and Sivers asymmetries turn out to be small, compatible with zero within the statistical errors, in line with the previously published results for not identified charged hadrons, and with the expected cancellation between the u- and d-quark contributions.
Exclusive rho^0 muoproduction on transversely polarised protons and deuterons
C. Adolph,M. G. Alekseev,V. Yu. Alexakhin,Yu. Alexandrov,G. D. Alexeev,A. Amoroso,A. A. Antonov,A. Austregesilo,B. Bade?ek,F. Balestra,J. Barth,G. Baum,Y. Bedfer,J. Bernhard,R. Bertini,M. Bettinelli,K. Bicker,J. Bieling,R. Birsa,J. Bisplinghoff,P. Bordalo,F. Bradamante,C. Braun,A. Bravar,A. Bressan,M. Büchele,E. Burtin,L. Capozza,M. Chiosso,S. U. Chung,A. Cicuttin,M. L. Crespo,S. Dalla Torre,S. Das,S. S. Dasgupta,S. Dasgupta,O. Yu. Denisov,L. Dhara,S. V. Donskov,N. Doshita,V. Duic,W. Dünnweber,M. Dziewiecki,A. Efremov,C. Elia,P. D. Eversheim,W. Eyrich,M. Faessler,A. Ferrero,A. Filin,M. Finger,M. Finger Jr,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J. M. Friedrich,V. Frolov,R. Garfagnini,F. Gautheron,O. P. Gavrichtchouk,S. Gerassimov,R. Geyer,M. Giorgi,I. Gnesi,B. Gobbo,S. Goertz,S. Grabmüller,A. Grasso,B. Grube,R. Gushterski,A. Guskov,T. Guth?rl,F. Haas,D. von Harrach,F. H. Heinsius,F. Herrmann,C. He?,F. Hinterberger,N. Horikawa,Ch. H?ppner,N. d'Hose,S. Ishimoto,O. Ivanov,Yu. Ivanshin,T. Iwata,R. Jahn,V. Jary,P. Jasinski,G. Jegou,R. Joosten,E. Kabu,D. Kang,B. Ketzer,G. V. Khaustov,Yu. A. Khokhlov,Yu. Kisselev,F. Klein,K. Klimaszewski,S. Koblitz,J. H. Koivuniemi,V. N. Kolosov,K. Kondo,K. K?nigsmann,I. Konorov,V. F. Konstantinov,A. Korzenev,A. M. Kotzinian,O. Kouznetsov,M. Kr?mer,Z. V. Kroumchtein,F. Kunne,K. Kurek,L. Lauser,A. A. Lednev,A. Lehmann,S. Levorato,J. Lichtenstadt,T. Liska,A. Maggiora,A. Magnon,N. Makke,G. K. Mallot,A. Mann,C. Marchand,A. Martin,J. Marzec
Physics , 2012, DOI: 10.1016/j.nuclphysb.2012.07.025
Abstract: The transverse target spin azimuthal asymmetry A_UT in hard exclusive production of rho^0 mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E^q, which are related to the orbital angular momentum of quarks in the nucleon. The Q^2, x_B and p_t^2 dependence of A_UT is presented in a wide kinematic range. Results for deuterons are obtained for the first time. The measured asymmetry is small in the whole kinematic range for both protons and deuterons, which is consistent with the theoretical interpretation that contributions from GPDs E^u and E^d approximately cancel.
Serum Non-Esterified Fatty Acids and Beta-Hydroxybutyrate in Dairy Cows with Retained Placenta
Turan Civelek*, Ibrahim Aydin1, C. Cagri Cingi, Oktay Yilmaz2 and Mustafa Kabu
Pakistan Veterinary Journal , 2011,
Abstract: The objective of this study was to establish serum concentrations of non-esterified fatty acids (NEFA) and beta-hydroxybutyrate (BHBA) in postpartum retained placenta in cattle. Moreover, high density lipoprotein (HDL), low density lipoprotein (LDL), very low density lipoprotein (VLDL), cholesterol (CHOL), triglycerides (TG), total proteins (TP), albumin (ALB), glucose (GLU) and blood urea nitrogen (BUN) levels were evaluated. Blood samples were obtained from multiparous Holstein dairy cows (n=38) with retained placenta between 12 to 24 hours after calving (Group 2). Clinically healthy multiparous Holstein dairy cows (n=6) calved approximately 7 days prior to the study served as control (Group 1). Concentration of TG, LDL, VLDL, ALB, BUN, CHOL and GLU did not vary between groups. Cows with retained placenta (Group 2) had higher level of BHBA (P=0.041) and NEFA (P=0.05) than control group. HDL and TP serum levels in cows with retained placenta were significantly lower than control cows. It was concluded that retained placenta could be associated with energy metabolism imbalance and postpartum negative-energy balance.
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