Measurements of b hadron production ratios in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 3 pb(-1) are presented. We study the ratios of strange B meson to light B meson production f(s)/(f(u) + f(d)) and Lambda(0)(b) baryon to light B meson production f(Lambda b)/(f(u) + f(d)) as a function of the charmed hadron-muon pair transverse momentum p(T) and the b hadron pseudorapidity eta, for p(T) between 0 and 14 GeV and eta between 2 and 5. We find that f(s)/(f(u) + f(d)) is consistent with being independent of p(T) and eta, and we determine f(s)/(f(u) + f(d)) = 0.134 +/- 0.004(-0.010)(+0.011), where the first error is statistical and the second systematic. The corresponding ratio f(Lambda b)/(f(u) + f(d)) is found to be dependent upon the transverse momentum of the charmed hadron-muon pair, f(Lambda b)/(f(u) + f(d)) = (0.404 +/- 0.017(stat)+/- 0.027(syst)+/-0.105(Br)) x [1-(0.031 +/- 0.004(sta)+/-0.003(syst) x p(T)(GeV)], where Br reflects an absolute scale uncertainty due to the poorly known branching fraction B(Lambda(+)(c) -> pK(-)pi(+). We extract the ratio of strange B meson to light neutral B meson production f(s)/f(d) by averaging the result reported here with two previous measurements derived from the relative abundances of (B) over bar (0)(s) -> D-s(+) pi(-) to (B) over bar (0) -> D+K- and (B) over bar (0) -> D+ pi(-). We obtain f(s)/f(d) = 0.267(-0.020)(+0.021).

Measurement of b hadron production fractions in 7 TeV pp collisions / R., A., C. A., B., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., G., A., P. A., C., J. A., A., S., A., Y., A., J., A., R. B., A., O. A., G., F., A., L., A., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 85:3(2012), pp. 032008-1-032008-16. [10.1103/PhysRevD.85.032008]

Measurement of b hadron production fractions in 7 TeV pp collisions

BIZZETI, Andrea;
2012

Abstract

Measurements of b hadron production ratios in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 3 pb(-1) are presented. We study the ratios of strange B meson to light B meson production f(s)/(f(u) + f(d)) and Lambda(0)(b) baryon to light B meson production f(Lambda b)/(f(u) + f(d)) as a function of the charmed hadron-muon pair transverse momentum p(T) and the b hadron pseudorapidity eta, for p(T) between 0 and 14 GeV and eta between 2 and 5. We find that f(s)/(f(u) + f(d)) is consistent with being independent of p(T) and eta, and we determine f(s)/(f(u) + f(d)) = 0.134 +/- 0.004(-0.010)(+0.011), where the first error is statistical and the second systematic. The corresponding ratio f(Lambda b)/(f(u) + f(d)) is found to be dependent upon the transverse momentum of the charmed hadron-muon pair, f(Lambda b)/(f(u) + f(d)) = (0.404 +/- 0.017(stat)+/- 0.027(syst)+/-0.105(Br)) x [1-(0.031 +/- 0.004(sta)+/-0.003(syst) x p(T)(GeV)], where Br reflects an absolute scale uncertainty due to the poorly known branching fraction B(Lambda(+)(c) -> pK(-)pi(+). We extract the ratio of strange B meson to light neutral B meson production f(s)/f(d) by averaging the result reported here with two previous measurements derived from the relative abundances of (B) over bar (0)(s) -> D-s(+) pi(-) to (B) over bar (0) -> D+K- and (B) over bar (0) -> D+ pi(-). We obtain f(s)/f(d) = 0.267(-0.020)(+0.021).
2012
85
3
032008-1
032008-16
Measurement of b hadron production fractions in 7 TeV pp collisions / R., A., C. A., B., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., G., A., P. A., C., J. A., A., S., A., Y., A., J., A., R. B., A., O. A., G., F., A., L., A., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 85:3(2012), pp. 032008-1-032008-16. [10.1103/PhysRevD.85.032008]
R., Aaji; C. A., Beteta; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander; G., Alkhazov; P....espandi
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/743708
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 202
  • ???jsp.display-item.citation.isi??? 150
social impact