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This article presents the first measurement of the ratio of branching
fractions B(Lambda(0)(b) -> Lambda(+)(c) mu(-) (nu) over bar
(mu))/B(Lambda(0)(b) -> Lambda(+)(c) pi(-)). Measurements in two control
samples using the same technique B((B) over bar (0) -> D+ mu(-) (nu)
over bar (mu))/B((B) over bar (0) -> D+ pi(-)) and B((B) over bar (0) ->
D*(2010)(+) mu(-) (nu) over bar (mu))/B((B) over bar (0) ->
D*(2010)(+) pi(-)) are also reported. The analysis uses data from an
integrated luminosity of approximately 172 pb(-1) of p (p) over bar
collisions at root s = 1: 96 TeV, collected with the CDF II detector at
the Fermilab Tevatron. The relative branching fractions are measured to
be B(Lambda(0)(b) -> Lambda(+)(c) mu(-) (nu) over bar
(mu))/B(Lambda(0)(b) -> Lambda(+)(c) pi(-)) = 16.6 +/- 3.0(stat) +/-
1.0(syst) (+2.6)(-3.4) (PDG) +/- 0.3(EBR), B((B) over bar (0) -> D+
mu(-) (nu) over bar (mu))/B((B) over bar (0) -> D+ pi(-)) = 9.9 +/-
1.0(stat) +/- 0.6(syst) +/- 0.4(PDG) +/- 0.5(EBR), and B((B) over bar
(0)-> D*(2010)(+) mu(-) (nu) over bar (mu))/B((B) over bar (0) ->
D*(2010)(+) pi(-)) = 16.5 +/- 2.3(stat) +/- 0.6(syst) +/- 0.5(PDG) +/-
0.8(EBR). The uncertainties are from statistics (stat), internal
systematics (syst), world averages of measurements published by the
Particle Data Group or subsidiary measurements in this analysis (PDG),
and unmeasured branching fractions estimated from theory (EBR),
respectively. This article also presents measurements of the branching
fractions of four new Lambda(0)(b) semileptonic decays: Lambda(0)(b) ->
Lambda(c)(2595)(+) mu(-) (nu) over bar (mu), Lambda(0)(b) ->
Lambda(c)(2625)(+) mu(-) (nu) over bar (mu), Lambda(0)(b) ->
Sigma(c)(2425)(0) pi(+) mu(-) (nu) over bar (mu) , and Lambda(0)(b) ->
Sigma(c)(2455)(++) pi(-) mu(-) (nu) over bar (mu), relative to the
branching fraction of the Lambda(0)(b) -> Lambda(+)(c) mu(-) (nu) over
bar (mu) decay. Finally, the transverse-momentum distribution of
Lambda(0)(b) baryons produced in p (p) over bar collisions is measured
and found to be significantly different from that of (B) over bar (0)
mesons, which results in a modification in the production crosssection
ratio sigma(Lambda b0)/sigma((B) over bar0) with respect to the CDF I
measurement.
First measurement of the ratio of branching fractions B(Lambda(0)(b) ->
Lambda(+)(c) mu(-) (nu)over-bar(mu))/B(Lambda(0)(b) -> Lambda(+)(c)
pi(-))
Aaltonen;T. and Adelman;J. and Akimoto;T. and Albrow;M. G. and Alvarez Gonzalez;B. and Amerio;S. and Amidei;D. and Anastassov;A. and Annovi;A. and Antos;J. and Apollinari;G. and Apresyan;A. and Arisawa;T. and Artikov;A. and Ashmanskas;W. and Attal;A. and Aurisano;A. and Azfar;F. and Azzurri;P. and Badgett;W. and Barbaro-Galtieri;A. and Barnes;V. E. and Barnett;B. A. and Bartsch;V. and Bauer;G. and Beauchemin;P. -H. and Bedeschi;F. and Beecher;D. and Behari;S. and Bellettini;G. and Bellinger;J. and Benjamin;D. and Beretvas;A. and Beringer;J. and Bhatti;A. and Binkley;M. and Bisello;D. and Bizjak;I. and Blair;R. E. and Blocker;C. and Blumenfeld;B. and Bocci;A. and Bodek;A. and Boisvert;V. and Bolla;G. and Bortoletto;D. and Boudreau;J. and Boveia;A. and Brau;B. and Bridgeman;A. and Brigliadori;L. and Bromberg;C. and Brubaker;E. and Budagov;J. and Budd;H. S. and Budd;S. and Burke;S. and Burkett;K. and Busetto;G. and Bussey;P. and Buzatu;A. and Byrum;K. 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C. and Dagenhart;D. and Datta;M. and Davies;T. and de Barbaro;P. and De Cecco;S. and Deisher;A. and De Lorenzo;G. and Dell'Orso;M. and Deluca;C. and Demortier;L. and Deng;J. and Deninno;M. and Derwent;P. F. and di Giovanni;G. P. and Dionisi;C. and Di Ruzza;B. and Dittmann;J. R. and D'Onofrio;M. and Donati;S. and Dong;P. and Donini;J. and Dorigo;T. and Dube;S. and Efron;J. and Elagin;A. and Erbacher;R. and Errede;D. and Errede;S. and Eusebi;R. and Fang;H. C. and Farrington;S. and Fedorko;W. T. and Feild;R. G. and Feindt;M. and Fernandez;J. P. and Ferrazza;C. and Field;R. and Flanagan;G. and Forrest;R. and Frank;M. J. and Franklin;M. and Freeman;J. C. and Furic;I. and Gallinaro;M. and Galyardt;J. and Garberson;F. and Garcia;J. E. and Garfinkel;A. F. and Genser;K. and Gerberich;H. and Gerdes;D. and Gessler;A. and Giagu;S. and Giakoumopoulou;V. and Giannetti;P. and Gibson;K. and Gimmell;J. L. and Ginsburg;C. 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2009-01-01
Abstract
This article presents the first measurement of the ratio of branching
fractions B(Lambda(0)(b) -> Lambda(+)(c) mu(-) (nu) over bar
(mu))/B(Lambda(0)(b) -> Lambda(+)(c) pi(-)). Measurements in two control
samples using the same technique B((B) over bar (0) -> D+ mu(-) (nu)
over bar (mu))/B((B) over bar (0) -> D+ pi(-)) and B((B) over bar (0) ->
D*(2010)(+) mu(-) (nu) over bar (mu))/B((B) over bar (0) ->
D*(2010)(+) pi(-)) are also reported. The analysis uses data from an
integrated luminosity of approximately 172 pb(-1) of p (p) over bar
collisions at root s = 1: 96 TeV, collected with the CDF II detector at
the Fermilab Tevatron. The relative branching fractions are measured to
be B(Lambda(0)(b) -> Lambda(+)(c) mu(-) (nu) over bar
(mu))/B(Lambda(0)(b) -> Lambda(+)(c) pi(-)) = 16.6 +/- 3.0(stat) +/-
1.0(syst) (+2.6)(-3.4) (PDG) +/- 0.3(EBR), B((B) over bar (0) -> D+
mu(-) (nu) over bar (mu))/B((B) over bar (0) -> D+ pi(-)) = 9.9 +/-
1.0(stat) +/- 0.6(syst) +/- 0.4(PDG) +/- 0.5(EBR), and B((B) over bar
(0)-> D*(2010)(+) mu(-) (nu) over bar (mu))/B((B) over bar (0) ->
D*(2010)(+) pi(-)) = 16.5 +/- 2.3(stat) +/- 0.6(syst) +/- 0.5(PDG) +/-
0.8(EBR). The uncertainties are from statistics (stat), internal
systematics (syst), world averages of measurements published by the
Particle Data Group or subsidiary measurements in this analysis (PDG),
and unmeasured branching fractions estimated from theory (EBR),
respectively. This article also presents measurements of the branching
fractions of four new Lambda(0)(b) semileptonic decays: Lambda(0)(b) ->
Lambda(c)(2595)(+) mu(-) (nu) over bar (mu), Lambda(0)(b) ->
Lambda(c)(2625)(+) mu(-) (nu) over bar (mu), Lambda(0)(b) ->
Sigma(c)(2425)(0) pi(+) mu(-) (nu) over bar (mu) , and Lambda(0)(b) ->
Sigma(c)(2455)(++) pi(-) mu(-) (nu) over bar (mu), relative to the
branching fraction of the Lambda(0)(b) -> Lambda(+)(c) mu(-) (nu) over
bar (mu) decay. Finally, the transverse-momentum distribution of
Lambda(0)(b) baryons produced in p (p) over bar collisions is measured
and found to be significantly different from that of (B) over bar (0)
mesons, which results in a modification in the production crosssection
ratio sigma(Lambda b0)/sigma((B) over bar0) with respect to the CDF I
measurement.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/243562
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