Measurement of B($B\to X_s \gamma$), the $B\to X_s \gamma$ photon energy spectrum, and the direct CP asymmetry in $B\to X_{s+d} \gamma$ decays

The photon spectrum in B --> X_s {\gamma} decay, where X_s is any strange hadronic state, is studied using a data sample of (382.8\pm 4.2) \times 10^6 e^+ e^- --> \Upsilon(4S) --> BBbar events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction B(B --> X_s \gamma) = (3.21 \pm 0.15 \pm 0.29 \pm 0.08)\times 10^{-4} and the first, second, and third moments = 2.267 \pm 0.019 \pm 0.032 \pm 0.003 GeV,, <(E_\gamma - )^2> = 0.0484 \pm 0.0053 \pm 0.0077 \pm 0.0005 GeV^2, and <(E_\gamma - )^3> = -0.0048 \pm 0.0011 \pm 0.0011 \pm 0.0004 GeV^3, for the range E_\gamma > 1.8 GeV, where E_{\gamma} is the photon energy in the B-meson rest frame. Results are also presented for narrower E_{\gamma} ranges. In addition, the direct CP asymmetry A_{CP}(B --> X_{s+d} \gamma) is measured to be 0.057 \pm 0.063. The spectrum itself is also unfolded to the B-meson rest frame; that is the frame in which theoretical predictions for its shape are made.

Note:

37 pages, 19 postscript figures, submitted to Phys. Rev. D. No analysis or results have changed from previous version. Some changes to improve clarity based on interactions with Phys. Rev. D referees, including one new Figure (Fig. 13), and some minor wording/punctuation/spelling mistakes fixed

12.15.Hh
11.30.Er
13.25.Hw
13.20.He
B: radiative decay
asymmetry: CP
photon: energy spectrum
B: branching ratio: measured
BaBar
electron positron: annihilation

References(64)

Figures(29)

[1]

Supersymmetric Enhancement of Noncharmed B Decays

- Nucl.Phys.B 294 (1987) 321-341
•
DOI:
- 10.1016/0550-3213(87)90585-2

[2]

Searching for supersymmetry in rare B decays

JoAnne L. Hewett
(
- SLAC
)
,
James D. Wells
(
- SLAC
)

- Phys.Rev.D 55 (1997) 5549-5560
•
e-Print:
- hep-ph/9610323
•
DOI:
- 10.1103/PhysRevD.55.5549

[3]

$b \to s \gamma$ and supersymmetry with large $\tan\beta$

Marcela Carena
(
- Fermilab and
- UC, Santa Cruz
)
,
David Garcia
(
- CERN
)
,
Ulrich Nierste
(
- Fermilab
)
,
Carlos E.M. Wagner
(
- Argonne and
- Chicago U., EFI and
- UC, Santa Cruz
)

- Phys.Lett.B 499 (2001) 141-146
•
e-Print:
- hep-ph/0010003
•
DOI:
- 10.1016/S0370-2693(01)00009-0

[4]

$\chi^2$ analysis of the minimal supergravity model including WMAP, $g_\mu-2$ and $b \to s \gamma$ constraints

Howard Baer
(
- Florida State U.
)
,
Csaba Balazs
(
- Florida State U.
)

- JCAP 05 (2003) 006
•
e-Print:
- hep-ph/0303114
•
DOI:
- 10.1088/1475-7516/2003/05/006

[5]

$b \to s \gamma$ in littlest Higgs model

Wu-jun Huo
(
- Ottawa Carleton Inst. Phys. and
- Carleton U.
)
,
Shou-hua Zhu
(
- Ottawa Carleton Inst. Phys. and
- Carleton U.
)

- Phys.Rev.D 68 (2003) 097301
•
e-Print:
- hep-ph/0306029
•
DOI:
- 10.1103/PhysRevD.68.097301

[6]

$\Delta M_{d,s}, B^0{d,s} \to \mu^{+} \mu^{-}$ and $B \to X_{s} \gamma$ in supersymmetry at large $\tan\beta$

Andrzej J. Buras
(
- Munich, Tech. U.
)
,
Piotr H. Chankowski
(
- Warsaw U.
)
,
Janusz Rosiek
(
- Munich, Tech. U. and
- Warsaw U.
)
,
Lucja Slawianowska
(
- Warsaw U.
)

- Nucl.Phys.B 659 (2003) 3
•
e-Print:
- hep-ph/0210145
•
DOI:
- 10.1016/S0550-3213(03)00190-1

[7]

b ---> s gamma in the left-right supersymmetric model

- Phys.Rev.D 65 (2002) 114006
•
e-Print:
- hep-ph/0202154
•
DOI:
- 10.1103/PhysRevD.65.114006

[8]

Universal extra dimensions and $b\to s \gamma$

- Phys.Lett.B 514 (2001) 309-314
•
e-Print:
- hep-ph/0105084
•
DOI:
- 10.1016/S0370-2693(01)00791-2

[9]

Direct CP violation in $B \to X_s \gamma$ decays as a signature of new physics

Alexander L. Kagan
(
- Cincinnati U.
)
,
Matthias Neubert
(
- CERN
)

- Phys.Rev.D 58 (1998) 094012
•
e-Print:
- hep-ph/9803368
•
DOI:
- 10.1103/PhysRevD.58.094012

[10]

Inclusive decay rate for $B \to X_d + \gamma$ in next-to-leading logarithmic order and CP asymmetry in the standard model

- Phys.Lett.B 429 (1998) 87-98
•
e-Print:
- hep-ph/9803314
•
DOI:
- 10.1016/S0370-2693(98)00456-0

[11]

Untagged $\bar B \to X_{s+d} \gamma$ CP asymmetry as a probe for new physics

- Nucl.Phys.B 704 (2005) 56-74
•
e-Print:
- hep-ph/0312260
•
DOI:
- 10.1016/j.nuclphysb.2004.10.024

[12]

CP asymmetries in $b \to (s/d)$ transitions as a test of CKM CP violation

Tobias Hurth
(
- CERN
)
,
Thomas Mannel
(
- CERN and
- Karlsruhe U., TTP
)

- Phys.Lett.B 511 (2001) 196-202
•
e-Print:
- hep-ph/0103331
•
DOI:
- 10.1016/S0370-2693(01)00578-0

[13]

Long-Distance Dominance of the CP Asymmetry in $B\to X_{s,d}+\gamma$ Decays

Michael Benzke
(
- Mainz U., Inst. Phys.
)
,
Seung J. Lee
(
- Weizmann Inst.
)
,
Matthias Neubert
(
- Mainz U., Inst. Phys.
)
,
Gil Paz
(
- Chicago U.
)

- Phys.Rev.Lett. 106 (2011) 141801
•
e-Print:
- 1012.3167
•
DOI:
- 10.1103/PhysRevLett.106.141801

[14]

Nonperturbative corrections to inclusive beauty and charm decays: QCD versus phenomenological models

Ikaros I.Y. Bigi
(
- Notre Dame U.
)
,
N.G. Uraltsev
(
- Notre Dame U. and
- St. Petersburg, INP
)
,
A.I. Vainshtein
(
- Minnesota U. and
- Novosibirsk, IYF
)

- Phys.Lett.B 293 (1992) 430-436,
- Phys.Lett.B 297 (1992) 477-477 (erratum)
•
e-Print:
- hep-ph/9207214
•
DOI:
- 10.1016/0370-2693(92)90908-M

[15]

Estimate of $\mathcal{B} (\bar B \to X_s \gamma)$ at $O(\alpha_s^2)$

M. Misiak
(
- Warsaw U. and
- CERN
)
,
H.M. Asatrian
(
- Yerevan Phys. Inst.
)
,
K. Bieri
(
- Bern U.
)
,
M. Czakon
(
- Wurzburg U.
)
,
A. Czarnecki
(
- Alberta U.
)

et al.

- Phys.Rev.Lett. 98 (2007) 022002
•
e-Print:
- hep-ph/0609232
•
DOI:
- 10.1103/PhysRevLett.98.022002

[16]

Moments of the photon spectrum in the inclusive B ---> X(s) gamma decay

Anton Kapustin
(
- Caltech
)
,
Zoltan Ligeti
(
- Caltech
)

- Phys.Lett.B 355 (1995) 318-324
•
e-Print:
- hep-ph/9506201
•
DOI:
- 10.1016/0370-2693(95)00762-A

[17]

QCD anatomy of B ---> X(s gamma) decays

Alexander L. Kagan
(
- Cincinnati U.
)
,
Matthias Neubert
(
- CERN
)

- Eur.Phys.J.C 7 (1999) 5-27
•
e-Print:
- hep-ph/9805303
•
DOI:
- 10.1007/s100529800959

[18]

Lepton energy distributions in heavy meson decays from QCD

- Phys.Lett.B 247 (1990) 399-405
•
DOI:
- 10.1016/0370-2693(90)90916-T

[19]

Preasymptotic Effects in Inclusive Weak Decays of Charmed Particles

Mikhail A. Shifman
(
- Moscow, ITEP
)
,
M.B. Voloshin
(
- Moscow, ITEP
)

- Sov.J.Nucl.Phys. 41 (1985) 120,
- Yad.Fiz. 41 (1985) 187-198

[20]

QCD predictions for lepton spectra in inclusive heavy flavor decays

Ikaros I.Y. Bigi
(
- Notre Dame U.
)
,
Mikhail A. Shifman
(
- Minnesota U.
)
,
N.G. Uraltsev
(
- Notre Dame U. and
- St. Petersburg, INP
)
,
Arkady I. Vainshtein
(
- Minnesota U. and
- Novosibirsk, IYF
)

- Phys.Rev.Lett. 71 (1993) 496-499,
•
e-Print:
- hep-ph/9304225
•
DOI:
- 10.1103/PhysRevLett.71.496

[21]

Inclusive semileptonic B and polarized Lambda(b) decays from QCD

Aneesh V. Manohar
(
- UC, San Diego
)
,
Mark B. Wise
(
- Caltech
)

- Phys.Rev.D 49 (1994) 1310-1329
•
e-Print:
- hep-ph/9308246
•
DOI:
- 10.1103/PhysRevD.49.1310

[22]

Heavy quark physics

Aneesh V. Manohar
(
- UC, San Diego
)
,
Mark B. Wise
(
- Caltech
)

- Camb.Monogr.Part.Phys.Nucl.Phys.Cosmol. 10 (2000) 1-191,
- Cambridge Monographs on Particle Physics, Nuclear Physics, and Cosmology, Vol. 10
•
DOI:
- 10.1017/9781009402125